Etiologic Diagnosis of Pulmonary Infection using Sputum Samples and Quantitative Loop-Mediated Isothermal Amplification (qLAMP) in Tianjian, China

Research Article | DOI: https://doi.org/10.31579/2690-1919/434

Etiologic Diagnosis of Pulmonary Infection using Sputum Samples and Quantitative Loop-Mediated Isothermal Amplification (qLAMP) in Tianjian, China

  • Chang Xie 1
  • Zhenhua Wu 1
  • Jie Li 1
  • Siyao Dong 2
  • Yonghong Ren 2
  • Fanlin Meng 2*

1Tianjin Key Laboratory of Cardiovascular Emergency and Critical Care, Tianjin Chest Hospital, Tianjin 300350, China

2National Engineering Research Center for Beijing Biochip Technology, CapitalBio Technology, Beijing 100176, China.

*Corresponding Author: Fanlin Meng, National Engineering Research Center for Beijing Biochip Technology, CapitalBio Technology, Beijing 100176, China.

Citation: Chang Xie, Zhenhua Wu, Jie Li, Siyao Dong, Yonghong Ren, et al, (2025), Etiologic Diagnosis of Pulmonary Infection using Sputum Samples and Quantitative Loop-Mediated Isothermal Amplification (qLAMP) in Tianjian, China, J Clinical Research and Reports, 17(2); DOI:10.31579/2690-1919/434

Copyright: © 2025, Fanlin Meng. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: 07 November 2024 | Accepted: 07 February 2025 | Published: 28 February 2025

Keywords: acute kidney injury; knee; arthroplasty

Abstract

This study endeavors to assess the efficacy of quantitative loop-mediated isothermal amplification (qLAMP) technology in the diagnosis of postoperative pulmonary pathogens and to evaluate its performance with that of conventional bacterial culture methods. The study encompassed 580 patients with a cardiac history, from whom sputum samples were collected postoperatively for the purpose of conducting qLAMP and bacterial culture tests. The findings reveal that qLAMP is capable of rapidly and accurately detecting pulmonary pathogens. Furthermore, we conducted an analysis of the clinical characteristics of the patients in light of the qLAMP results, uncovering significant correlations between age, smoking index, and postoperative tissue oxygen saturation levels with the incidence of pulmonary infections. The findings emphasize the potential of qLAMP in enhancing the accuracy of postoperative pulmonary infection diagnoses, providing a new rapid diagnostic tool for clinical use.

Introduction

Ischemic heart disease (ICM) is the leading global killer, accounting for 16% of the total number of deaths worldwide [1]. Although narrowings in many areas can be effectively treated by percutaneous coronary intervention (PCI), there are still some blockages that require surgical intervention. Surgical coronary artery bypass grafting (CABG) is the standard treatment for revascularization of left main or three-vessel coronary artery disease [2]. Up to 14% of patients who undergo CSBG seek medical attention within 30 days of discharge due to postoperative complications [3-5]. The postoperative complications, including sternal wound infections, pneumonia, thromboembolic phenomena, graft failure, atrial fibrillation, pulmonary hypertension, pericardial effusion, strokes, renal injury, gastrointestinal insults, and hemodynamic instability, can result in significant morbidity and mortality [6]. 

Pulmonary complications in the postoperative period are a significant cause of morbidity and mortality [7; 8]. In previous studies, certain interventions have been found to be effective in significantly reducing postoperative pulmonary complications. For example, it has been shown that the incidence of pulmonary complications in patients who quit smoking for more than 2 months is lower compared to those who quit smoking for 2 months or less (57.1% vs 14.5%) [9]. In addition, the incidence of postoperative pulmonary complications is lower in patients who receive preoperative lung function optimization (including bronchodilators, antibiotics, and various combinations of systemic corticosteroids) compared to patients who did not receive preoperative optimization [8]. Correct diagnosis of pathogens helps in the appropriate use of antibiotics, thereby reducing the incidence of postoperative pneumonia complications in patients. 

Culture method is the gold standard for identifying bacteria and fungi, but traditional bacterial culture has low sensitivity and often delays target antibiotic therapy. Quantitative loop-mediated isothermal amplification (qLAMP) as a new implement for detecting pathogens is earlier, faster, more sensitive, and more specific than culture [10]. In this study, the culture and qLAMP methods were used to identified the potential pathogens that can cause complication in pneumonia.

An rapid innovative method for etiology identification, the quantitative loop-mediated isothermal arnplification (qLAMP), has already been used in the diagnosis of virus, fungus, parasite, and tuberculosis infections and is now commercially available [11]. It is a novel assay that focuses on the genetics of pathogens based on rapid nucleic acid amplification method. This technique has two important advantages such as rapid diagnosis and high sensitivity In addition.qLAMP is also a high specific assay,which could detect different bacteria with quantified copies. Considering the excellent timeliness and accuracy of qLAMP we initiated a pilot, prospective study to investigate the value of qLAMP to guide target antibiotics therapies in a small group of patients with Pulmonary infeciton after operation.

Materials and methods

Patients’ selection

A total of 580 with a history of heart disease diagnosed by physicians in Tianjin Chest Hospital were consecutively enrolled in this study. They had typical characteristics of pneumonia, for example①fever , ②leukopenia or leukocytosis ③exacerbated dyspnea [12]. Written consent was obtained from all patients prior to recruitment. All participating researchers were trained thoroughly on patient enrollment, sample collection, and clinical information entry.

Procedures of qLAMP

The approach to sample and information collection was based on previous studies [13]. After liquefied in an equal volume of 10% NaOH, DNA specimen of each sample was isolated using the Universal Kit for Bacterial DNA Extraction (Capitalbio Corporation, China).The specimens were then prepared for qLAMP using a set of specific primers for Streptococcus pneumonia (SP), Staphylococcus aureus (SA), 

Patient IDPatient NameCase NumberAdmission Date (AA001)Gender (AA002)Age(AA003)PneumoniaSmoking History(AA015)
633S1S074652022-02-15Female65NOPreviously
994S2S173072022-07-05Male65NONever
1111S3S180752022-07-14Male57NOPreviously
469S4S036212021-12-07Female61NONever
621S5S067392022-02-09Female65NONever
637S6S074302022-02-16Male63YESPreviously
670S7S089432022-03-03Male70NOWithin 6 weeks
714S8R713102022-03-24Male63NOPreviously
731S9S110102022-04-01Male79NONever
745S10S111552022-04-11Male73NOPreviously
768S11S121962022-04-19Male62NONever
769S12S120902022-04-19Male55YESWithin 6 weeks
800S13T346522022-04-27Male62YESNever
877S14S141772022-05-24Male63NOWithin 6 weeks
888S15S145552022-05-26Male68NONever
939S16S156992022-06-14Male64NONever
942S17S160322022-06-14Male78NONever
959S18S164852022-06-21Male69NOWithin 6 weeks
960S19S163082022-06-21Female56YESNever
982S20S168392022-06-30Male63NONever
984S21S167992022-06-30Male73NOWithin 6 weeks
1001S22S175932022-07-06Male75NOPreviously
1106S23S178572022-07-13Male61NOPreviously
1110S24S179842022-07-14Male60NOWithin 6 weeks
1115S25S181902022-07-18Male71NOPreviously
1132S26S184982022-07-22Female72NONever
479S27S036772021-12-09Male69NOPreviously
486S28S037492021-12-13Male72NONever
488S29R376812021-12-13Male70NOPreviously
506S30S040892021-12-17Female69NONever
507S31S032642021-12-17Female77NONever
509S32S041632021-12-20Male61NORecently
557S33S052832022-01-04Male65NONever
566S34S060132022-01-06Male69NOWithin 6 weeks
574S35T141922022-01-08Male45NOPreviously
577S36S034972022-01-10Female71NOWithin 6 weeks
589S37R608822022-01-14Male62NOPreviously
592S38S061582022-01-18Male68NOWithin 6 weeks
595S39S060832022-01-19Male79YESPreviously
596S40S063572022-01-19Male67NOPreviously
605S41S066462022-01-26Male58NOWithin 6 weeks
610S42S067952022-01-28Male69NOWithin 6 weeks
624S43S070592022-02-10Male74NOWithin 6 weeks
625S44R491532022-02-11Male63NOWithin 6 weeks
627S45S024172022-02-11Female67NONever
634S46T909062022-02-15Male63NOPreviously
636S47S077972022-02-21Male72NONever
642S48S078362022-02-18Male68NOWithin 6 weeks
643S49S079812022-02-20Female73NOWithin 6 weeks
650S50R961382022-02-23Male67YESPreviously
654S51S082742022-02-24Male60NONever
660S52T474002022-02-28Male72NOPreviously
662S53S085542022-02-28Male73NOPreviously
663S54S083862022-03-01Male68NOPreviously
686S55S094412022-03-10Male81NONever
697S56S097622022-03-16Male62YESNever
700S57S086542022-03-17Male69NOPreviously
707S58S101852022-03-21Male61YESWithin 6 weeks
708S59S091302022-03-22Male79NOPreviously
713S60S103202022-03-23Male68NOWithin 6 weeks
718S61S107412022-03-28Male74YESWithin 6 weeks
719S62S101542022-03-28Male66NOPreviously
748S63S116042022-04-12Female75NOPreviously
755S64S117102022-04-13Male79NOPreviously
765S65S121652022-04-18Male80NOPreviously
770S66S118722022-04-19Female75NOWithin 6 weeks
773S67R076532022-04-20Male66YESPreviously
802S68S089082022-04-27Male66NOWithin 6 weeks
822S69S131612022-05-07Male61NOWithin 6 weeks
827S70S133452022-05-09Female68NONever
830S71S128182022-05-09Female56NONever
832S72S130922022-05-10Male35NOPreviously
839S73S137042022-05-11Male63NOWithin 6 weeks
841S74S135102022-05-12Male71NOWithin 6 weeks
846S75S130542022-05-13Male76NOPreviously
873S76S144182022-05-23Male61NOWithin 6 weeks
875S77S143992022-05-23Male68YESRecently
879S78R802552022-05-24Male65YESPreviously
880S79S143892022-05-24Male60NONever
882S80S145052022-05-25Male63NOWithin 6 weeks
889S81S147022022-05-27Female66NOWithin 6 weeks
891S82S146042022-05-26Female57NONever
892S83S145972022-05-27Male59NOPreviously
896S84S146962022-05-30Male70NOWithin 6 weeks
919S85S155382022-06-07Male60NOPreviously
924S86S153142022-06-08Male46NONever
932S87S156662022-06-10Male58NOWithin 6 weeks
933S88S151482022-06-10Female68NOWithin 6 weeks
934S89S154412022-06-13Male67NOPreviously
940S90S156012022-06-14Male62NOWithin 6 weeks
946S91S159992022-06-15Male64NOWithin 6 weeks
948S92S158872022-06-16Male54NOWithin 6 weeks
962S93S164592022-06-22Male74NOWithin 6 weeks
964S94S145892022-06-23Male74NONever
974S95S169602022-06-27Male65NONever
978S96S168802022-06-29Female78NOPreviously
992S97S171722022-07-04Male42NOWithin 6 weeks
995S98S173222022-07-05Male63YESWithin 6 weeks
997S99S173502022-07-05Male69YESPreviously
1005S100S177272022-07-08Male70NOWithin 6 weeks
1009S101S178202022-07-11Female69NONever
1107S102S178352022-07-13Male72NONever
1120S103S181182022-07-19Male66NOPreviously
1121S104S183302022-07-20Female59NONever
1123S105R045192022-07-20Male65NONever
1130S106S184252022-07-22Male48NOWithin 6 weeks
1131S107S180542022-07-22Male62NOWithin 6 weeks
1135S108T720672022-07-25Female69NOPreviously
1137S109S187212022-07-25Male68NONever
1148S110S191022022-07-28Female65NONever
445S111T059272021-11-26Male70YESPreviously
484S112R985202021-12-13Male79NOPreviously
487S113S035892021-12-13Male67NOWithin 6 weeks
490S114S039602021-12-14Male60NOWithin 6 weeks
495S115S038882021-12-15Male68NOWithin 6 weeks
496S116S038932021-12-15Male72NOPreviously
500S117R476472021-12-16Male64NONever
503S118S036102021-12-16Female51NONever
504S119S041452021-12-17Male66NOWithin 6 weeks
505S120S041162021-12-17Male65NOWithin 6 weeks
513S121S044762021-12-20Male73NOPreviously
535S122S044392021-12-27Male67NOWithin 6 weeks
538S123S051322021-12-28Female65NONever
550S124S051932021-12-30Male84NONever
553S125S051682022-01-03Male61NOWithin 6 weeks
554S126S055032022-01-03Male60NOWithin 6 weeks
565S127S052482022-01-05Male58NOWithin 6 weeks
568S128S059072022-01-06Male76NOPreviously
576S129S061412022-01-10Male70NONever
579S130S059612022-01-10Male55NOPreviously
597S131S064162022-01-20Male68NOWithin 6 weeks
600S132S062642022-01-25Female74YESNever
602S133S067032022-01-25Male68NONever
614S134S068222022-02-07Male77NONever
615S135S070142022-02-07Male57NOWithin 6 weeks
629S136S072632022-02-14Male54NOWithin 6 weeks
622S137S069952022-02-10Male74NOPreviously
623S138R819602022-02-10Male62NOPreviously
626S139S070582022-02-11Male75NOWithin 6 weeks
631S140R285362022-02-14Male63NOPreviously
638S141S074582022-02-17Female77NOPreviously
639S142S078232022-02-17Male72NOWithin 6 weeks
641S143S074242022-02-17Male69NOPreviously
648S144S075722022-02-22Male71NOWithin 6 weeks
651S145S079302022-02-23Male65NOWithin 6 weeks
655S146T236202022-02-24Male68NOWithin 6 weeks
657S147S082722022-02-25Female59NORecently
659S148S080022022-02-25Male65NONever
668S149S083032022-03-02Female64NONever
674S150S091522022-03-08Male70NOWithin 6 weeks
682S151S090812022-03-09Male64YESPreviously
685S152S094912022-03-10Male65NOPreviously
687S153S096172022-03-10Male71NONever
691S154S083702022-03-14Female73NONever
698S155S097762022-03-16Male64NOPreviously
701S156T289072022-03-17Male71YESWithin 6 weeks
702S157S100402022-03-17Female62NOWithin 6 weeks
705S158S100812022-03-18Male69NORecently
709S159T262652022-03-22Male66NOWithin 6 weeks
710S160S099442022-03-22Male79NOWithin 6 weeks
726S161S106472022-03-30Female71NOPreviously
727S162S105392022-03-31Male56NOWithin 6 weeks
737S163S109722022-04-06Male72NOPreviously
738S164S111022022-04-07Female76YESNever
739S165S108392022-04-07Female60NONever
741S166S112772022-04-08Male69NONever
742S167T709222022-04-08Male68YESRecently
743S168S114152022-04-08Male59NONever
744S169S114432022-04-11Male67NOPreviously
746S170S114952022-04-11Female65NONever
749S171T143612022-04-12Male75YESWithin 6 weeks
750S172S113082022-04-12Female72NONever
751S173S116082022-04-12Male49NOWithin 6 weeks
756S174S116092022-04-14Male62NOWithin 6 weeks
759S175S117022022-04-14Male69NONever
761S176S112872022-04-15Male69NOWithin 6 weeks
762S177S118302022-04-15Female73NONever
766S178S118522022-04-18Male75NOPreviously
771S179S120302022-04-19Male39NOWithin 6 weeks
774S180S119482022-04-20Male76YESPreviously
775S181S116512022-04-20Male65NOWithin 6 weeks
777S182R311792022-04-20Male45NOWithin 6 weeks
778S183S120412022-04-21Male64NOWithin 6 weeks
781S184S123582022-04-21Male66NOWithin 6 weeks
788S185S126122022-04-24Female80NONever
791S186S122792022-04-25Male73NONever
792S187S126112022-04-25Male75NOPreviously
793S188S126852022-04-25Male77NONever
795S189T016672022-04-26Male70NONever
797S190S127942022-04-26Male72NOPreviously
798S191S125072022-04-26Male66NORecently
803S192S126922022-04-27Male58YESWithin 6 weeks
805S193S125612022-04-28Male72NOPreviously
807S194T281192022-04-28Male64NORecently
808S195S130402022-04-29Male65NOWithin 6 weeks
809S196S129002022-04-29Male80YESPreviously
810S197S126432022-05-04Male68YESWithin 6 weeks
811S198T638152022-04-29Male58NOWithin 6 weeks
817S199S130702022-05-05Male65YESWithin 6 weeks
820S200S128992022-05-06Male73YESPreviously
821S201S131762022-05-07Male61NOWithin 6 weeks
823S202S132612022-05-07Female79NOPreviously
824S203S133742022-05-07Male67NONever
826S204S134832022-05-09Female71NOWithin 6 weeks
833S205S131162022-05-10Male77NOPreviously
855S206S142232022-05-17Male70NONever
858S207R069232022-05-17Male67NOWithin 6 weeks
862S208S143732022-05-18Male50NOWithin 6 weeks
876S209T498052022-05-23Female69YESNever
878S210S138082022-05-24Male67NOPreviously
885S211S146072022-05-25Male63NOWithin 6 weeks
898S212S116682022-05-30Male56NOWithin 6 weeks
902S213S151512022-06-01Female80NONever
927S214S154402022-06-09Male66NOPreviously
930S215S153062022-06-10Female74NONever
931S216S158192022-06-10Male72YESNever
935S217S154562022-06-13Male62NOWithin 6 weeks
941S218S158232022-06-15Male59NONever
943S219S156172022-06-15Male68NOPreviously
952S220S161592022-06-17Male70YESWithin 6 weeks
953S221S158062022-06-17Male63NOPreviously
955S222S160792022-06-20Male71NONever
956S223S163892022-06-21Male66NOWithin 6 weeks
963S224S162992022-06-22Male49NOWithin 6 weeks
965S225S163732022-06-23Male67NOWithin 6 weeks
966S226S166332022-06-23Male56NOPreviously
968S227S165372022-06-24Male70NONever
975S228S168772022-06-28Female55NONever
976S229T088642022-06-28Male64NOWithin 6 weeks
977S230S164662022-06-28Female72YESNever
979S231S168302022-06-29Male49NOWithin 6 weeks
980S232S167492022-06-29Male75NOPreviously
988S233S163752022-07-01Male62YESWithin 6 weeks
990S234S170882022-07-04Male73YESWithin 6 weeks
998S235S173312022-07-06Male59NONever
1002S236S175282022-07-07Male65NOWithin 6 weeks
1003S237S174342022-07-07Male68NONever
1100S238S178212022-07-11Female62YESNever
1102S239T012742022-07-12Female76NOPreviously
1104S240S174452022-07-12Male43NOWithin 6 weeks
1105S241S180572022-07-12Male47NONever
1108S242S179692022-07-13Female69NOWithin 6 weeks
1113S243S180742022-07-15Male58NOPreviously
1116S244R001182022-07-18Male79NOPreviously
1117S245S165762022-07-18Male68NORecently
1122S246S186842022-07-20Female60NOWithin 6 weeks
1126S247S183862022-07-21Female63NONever
1127S248S181832022-07-21Male72NOPreviously
1134S249S188392022-07-25Male71NOWithin 6 weeks
1140S250S188702022-07-26Male70NOPreviously
1142S251S189142022-07-27Male65NONever
1143S252S187552022-07-27Male68NOPreviously
471S253S033712021-12-08Male54NONever
474S254T793952021-12-08Male55NONever
478S255S032602021-12-09Female61NOWithin 6 weeks
481S256S034602021-12-10Male71NOWithin 6 weeks
483S257R837112021-12-10Female75NONever
485S258S037402021-12-13Male61NOWithin 6 weeks
494S259S041292021-12-15Male67NOWithin 6 weeks
497S260R006272021-12-15Male76NOPreviously
501S261S047462021-12-21Male65NONever
502S262S039782021-12-16Male63NOWithin 6 weeks
510S263S039382021-12-20Female65YESNever
511S264T993792021-12-20Female72YESNever
512S265T104512021-12-20Male61NOWithin 6 weeks
518S266S043332021-12-21Male57NOWithin 6 weeks
523S267S047932021-12-22Male57NOWithin 6 weeks
526S268S037482021-12-23Male63NOWithin 6 weeks
527S269S045592021-12-23Male66NORecently
528S270S044842021-12-23Male57NORecently
530S271T279332021-12-24Female64NOWithin 6 weeks
532S272S050072021-12-24Male63NOWithin 6 weeks
533S273S048612021-12-27Female72NONever
546S274S053212021-12-29Male67NONever
556S275S054492022-01-03Male57NOPreviously
561S276S059302022-01-05Female75NONever
563S277S056382022-01-05Male59NOPreviously
572S278S026072022-01-08Male62NOWithin 6 weeks
578S279S065222022-01-22Male64NOWithin 6 weeks
580S280T320512022-01-10Male72YESWithin 6 weeks
581S281S059542022-01-10Male53NONever
583S282S056682022-01-12Male71NOPreviously
584S283S044992022-01-12Male58NOWithin 6 weeks
585S284S065472022-01-22Male59NOPreviously
591S285S062262022-01-17Male65YESWithin 6 weeks
594S286S063982022-01-18Male76NOWithin 6 weeks
598S287S064952022-01-20Male64YESRecently
599S288R607552022-01-24Female69NONever
607S289S067272022-01-27Male52NOWithin 6 weeks
609S290S067602022-01-28Male58NOWithin 6 weeks
613S291S068292022-01-29Male66NONever
616S292S068362022-02-07Female60NONever
617S293S071572022-02-08Male59NONever
618S294S071352022-02-08Male71NOWithin 6 weeks
620S295S070432022-02-09Male69NOPreviously
630S296S073982022-02-14Male73YESRecently
632S297S069632022-02-15Male65NOWithin 6 weeks
635S298S076212022-02-16Male69NOWithin 6 weeks
640S299S075622022-02-17Male61NONever
644S300S068602022-02-18Male62NOWithin 6 weeks
645S301S074072022-02-21Male67NOPreviously
646S302S079072022-02-21Male76NONever
647S303S079002022-02-22Male67NOWithin 6 weeks
649S304S080292022-02-22Male65NOWithin 6 weeks
652S305S083752022-02-23Female64NOWithin 6 weeks
653S306S083582022-02-24Female64NONever
656S307S080812022-02-25Male73NONever
658S308S081352022-02-25Female72NONever
661S309S084622022-02-28Female67NONever
664S310S085092022-03-01Female68NONever
665S311S085622022-03-01Female65NONever
666S312S083192022-03-01Male64NOWithin 6 weeks
667S313S088512022-03-02Male69NOPreviously
669S314S084742022-03-03Female66YESNever
671S315R757532022-03-04Female62NONever
672S316S082992022-03-04Male64NONever
673S317R990182022-03-07Male61NORecently
675S318S088412022-03-07Male55YESPreviously
676S319S086102022-03-08Female69YESNever
677S320S089122022-03-09Male70NONever
678S321S093812022-03-08Male66NOWithin 6 weeks
679S322S087052022-03-08Male72NOWithin 6 weeks
680S323S061922022-03-09Male64NONever
681S324R877772022-03-09Male65NOWithin 6 weeks
683S325S091262022-03-09Male57NONever
684S326S090742022-03-10Male72NOWithin 6 weeks
688S327S094862022-03-11Female68NOPreviously
689S328S094772022-03-11Male73NOPreviously
690S329S093732022-03-11Male68YESWithin 6 weeks
692S330S095712022-03-14Female64YESNever
693S331T020552022-03-14Male73 Previously
694S332S095782022-03-15Male66NOWithin 6 weeks
695S333S097072022-03-15Female66NONever
696S334S096232022-03-15Male67NONever
699S335S095102022-03-16Male64NONever
703S336S101472022-03-18Male67NONever
704S337S100642022-03-18Female68NONever
706S338S100592022-03-21Male67NOWithin 6 weeks
711S339S102792022-03-23Female69NOWithin 6 weeks
712S340T088042022-03-23Female68NONever
715S341S101772022-03-24Male68NONever
716S342S105992022-03-25Female67NONever
717S343S103462022-03-27Male64NOPreviously
720S344S106122022-03-28Male58NONever
721S345S108862022-03-29Female69NONever
722S346S106902022-03-29Male68NONever
723S347S106732022-03-29Male59NOWithin 6 weeks
724S348S107152022-03-30Male58NONever
725S349S109142022-03-30Male69NONever
729S350S102982022-03-31Female67NONever
730S351S109712022-04-01Male68NONever
733S352S109672022-04-02Female71YESNever
734S353S108892022-04-02Male61NOWithin 6 weeks
735S354S111102022-04-02Female73YESNever
736S355R976122022-04-06Male62NONever
740S356T463832022-04-07Male67NONever
747S357S112422022-04-11Male59NOWithin 6 weeks
752S358S117992022-04-13Male66NONever
753S359S114082022-04-13Male71NOPreviously
754S360S112332022-04-13Female80NONever
757S361S116752022-04-14Male75NOWithin 6 weeks
758S362S119222022-04-14Male38YESNever
760S363S114532022-04-15Male80NONever
763S364S039992022-04-15Female66NONever
764S365S119962022-04-18Male68NOPreviously
767S366S119032022-04-18Male73NOPreviously
772S367S119452022-04-19Female73YESWithin 6 weeks
776S368S116152022-04-20Male77NOWithin 6 weeks
779S369S124372022-04-21Male61NONever
780S370S115752022-04-21Female75NONever
782S371S115622022-04-21Male51NOWithin 6 weeks
783S372S122322022-04-21Female65NONever
784S373R353782022-04-22Female67NONever
785S374S124942022-04-22Male79NONever
786S375S125102022-04-22Female74NOWithin 6 weeks
787S376S123942022-04-22Female64YESNever
789S377S117842022-04-24Male66NOPreviously
790S378S123172022-04-24Male69NOWithin 6 weeks
794S379S124622022-04-25Male43NOPreviously
796S380S121322022-04-26Male71NOWithin 6 weeks
799S381S126172022-04-26Female69NOWithin 6 weeks
801S382S117532022-04-27Male55YESWithin 6 weeks
813S383S124972022-05-05Male71NONever
814S384S129422022-05-05Female61YESNever
815S385S129682022-05-05Male51NOWithin 6 weeks
816S386T620202022-05-05Female72NONever
818S387T922352022-05-06Female63NONever
819S388S133882022-05-06Male70NOWithin 6 weeks
825S389S130752022-05-07Female69NONever
828S390S135302022-05-09Female68NONever
829S391S131192022-05-09Male77NOWithin 6 weeks
831S392S133262022-05-10Female67NONever
834S393T691232022-05-11Male60NOPreviously
835S394S135442022-05-10Male60NOWithin 6 weeks
836S395S129852022-05-11Male68NOWithin 6 weeks
837S396S133632022-05-11Male71NOWithin 6 weeks
838S397S133292022-05-11Male71YESWithin 6 weeks
842S398S135702022-05-12Male72NOWithin 6 weeks
843S399S138722022-05-12Female63NONever
844S400S132732022-05-13Female71NONever
845S401S057572022-05-13Female70YESNever
847S402S136592022-05-13Male66NONever
848S403S136762022-05-13Male67NOWithin 6 weeks
849S404S140022022-05-16Male67NOWithin 6 weeks
850S405S140402022-05-16Male69NOWithin 6 weeks
851S406S130292022-05-16Male69NOPreviously
852S407S137922022-05-16Male62NONever
853S408S137792022-05-16Male64NOWithin 6 weeks
854S409S139822022-05-16Male66NOWithin 6 weeks
856S410S142032022-05-17Female69NOWithin 6 weeks
857S411S140202022-05-17Male76NONever
859S412S138342022-05-17Male60NOWithin 6 weeks
860S413S141022022-05-18Female71YESNever
861S414S138032022-05-18Female70NONever
863S415S142262022-05-18Female50YESNever
864S416S143192022-05-19Male73NOWithin 6 weeks
865S417R171562022-05-19Male72NOPreviously
866S418S137272022-05-19Male76NONever
867S419S142682022-05-19Male61NOWithin 6 weeks
868S420S140892022-05-20Female75NONever
869S421S143622022-05-20Male69NOWithin 6 weeks
870S422S139692022-05-20Male77YESNever
871S423S140952022-05-20Female50NONever
872S424S142282022-05-23Male65NONever
874S425S141102022-05-23Female68NONever
881S426S141412022-05-24Female67YESNever
883S427S144242022-05-25Female63NONever
884S428S140332022-05-25Male67NOWithin 6 weeks
887S429S145082022-05-26Male59NOWithin 6 weeks
890S430S144832022-05-26Male53NOWithin 6 weeks
893S431S137022022-05-27Male72YESPreviously
894S432S146142022-05-30Female70NOPreviously
895S433S145922022-05-30Female70NONever
897S434S150362022-05-31Male66NONever
899S435S132022022-05-31Male60NOPreviously
900S436S151692022-05-31Female71NOPreviously
901S437S147882022-05-31Male48NONever
903S438T586942022-06-01Male63NOPreviously
904S439S093012022-06-01Male52NORecently
905S440S150772022-06-01Female57NONever
906S441S147132022-06-02Female60NOWithin 6 weeks
907S442S150702022-06-02Female66NONever
908S443S150082022-06-02Male68NOPreviously
909S444S135892022-06-02Male61YESWithin 6 weeks
910S445S153292022-06-05Male67NOPreviously
911S446S151042022-06-06Male61NOPreviously
912S447R568792022-06-06Female66NONever
913S448S150902022-06-06Male64NONever
914S449S153542022-06-06Male65NOWithin 6 weeks
915S450S152332022-06-06Male67YESPreviously
916S451S153602022-06-07Male73NOPreviously
917S452S154852022-06-09Male62NOWithin 6 weeks
920S453S153182022-06-07Female63NONever
921S454S152752022-06-08Male81NONever
922S455S154012022-06-08Male74NOPreviously
923S456S151262022-06-08Male67NONever
925S457S150172022-06-09Male81YESNever
926S458S156692022-06-09Male68NOWithin 6 weeks
928S459S155292022-06-09Male65NORecently
936S460S157712022-06-13Male87NOPreviously
937S461S153162022-06-13Male61NOWithin 6 weeks
938S462S157552022-06-13Male50NOPreviously
944S463S147682022-05-27Male64NOWithin 6 weeks
945S464S119382022-05-27Male66NONever
947S465S161432022-06-16Male44NOWithin 6 weeks
949S466S152142022-06-16Female79NOPreviously
950S467S159082022-06-16Male64NOPreviously
951S468S112092022-06-17Female61NOPreviously
954S469S158442022-06-17Male51NOWithin 6 weeks
957S470S159192022-06-20Male59NONever
958S471S146482022-06-20Male62NONever
961S472S163312022-06-22Female67NONever
967S473T438832022-06-23Female75NONever
969S474S161932022-06-24Male47NOWithin 6 weeks
970S475S167932022-06-24Male55NONever
971S476S155752022-06-27Male59NOPreviously
972S477S161002022-06-27Male65NOWithin 6 weeks
973S478S166752022-06-27Male68NONever
981S479S170002022-06-29Female77NOPreviously
985S480S173082022-07-01Female67NONever
986S481S145612022-07-01Female67NONever
987S482S169292022-07-01Female68NONever
989S483S171122022-07-03Male70NOWithin 6 weeks
991S484S173202022-07-04Male72NONever
993S485S171222022-07-04Female59NONever
996S486S173062022-07-05Female69NONever
999S487S173812022-07-06Female54NONever
1000S488S171562022-07-06Male69NOWithin 6 weeks
1004S489S175772022-07-08Male53NOWithin 6 weeks
1006S490S171442022-07-08Female70NONever
1007S491S167192022-06-28Male76NORecently
1008S492S178482022-07-11Male76NOWithin 6 weeks
1101S493S181802022-07-14Male73NONever
1103S494S180302022-07-12Female60NONever
1109S495S177132022-07-14Male72NONever
1112S496S179972022-07-15Female77NONever
1114S497S181082022-07-18Male63NONever
1118S498S182212022-07-19Male62NOWithin 6 weeks
1119S499S177472022-07-19Male77NOWithin 6 weeks
1124S500S182862022-07-20Male75NOPreviously
1125S501S186392022-07-20Male73YESNever
1128S502S184922022-07-21Male62NOWithin 6 weeks
1129S503S186452022-07-21Male63NONever
1133S504S183362022-07-22Male77NONever
1136S505S183952022-07-25Male65NONever
1138S506S188802022-07-26Male66NONever
1139S507S186272022-07-26Male65NOWithin 6 weeks
1144S508S191162022-07-27Female71NOPreviously
1145S509S189282022-07-27Male72NOWithin 6 weeks
1146S510S187442022-07-28Female65NONever
1147S511S184802022-07-28Male66NOWithin 6 weeks
1149S512S191292022-07-28Male57NOWithin 6 weeks
460S513S030992021-12-02Male60NONever
461S514S018502021-12-02Male53NONever
464S515S037102021-12-08Male70NOPreviously
465S516S028512021-12-07Male65NONever
470S517S036572021-12-07Male72NONever
472S518S031422021-12-08Male76NOWithin 6 weeks
473S519S033442021-12-08Male62YESPreviously
475S520S021472021-12-08Male66NOWithin 6 weeks
476S521S028702021-12-09Male56NONever
477S522S036422021-12-09Male73NOPreviously
480S523S026292021-12-10Male76NOPreviously
482S524S040522021-12-10Female65NONever
489S525S038902021-12-14Female71NONever
491S526T809522021-12-14Male68NOWithin 6 weeks
492S527S041762021-12-14Female61NONever
493S528S038812021-12-14Male65NOWithin 6 weeks
499S529S044282021-12-16Male68YESNever
508S530S042392021-12-17Female60NOWithin 6 weeks
514S531S042672021-12-21Male68NONever
515S532S043412021-12-21Male76NONever
516S533S042852021-12-21Male67NONever
519S534S044012021-12-22Male66NOWithin 6 weeks
520S535S041972021-12-22Female69NOWithin 6 weeks
521S536S048732021-12-22Female70NONever
522S537S047412021-12-24Female56NONever
524S538S021552021-12-23Male68NOPreviously
525S539R646592021-12-23Female83NOPreviously
529S540S037472021-12-24Female59YESNever
531S541T689662021-12-24Female76NONever
534S542S041722021-12-27Male71NOWithin 6 weeks
536S543S052032021-12-29Male64NOWithin 6 weeks
537S544S052792021-12-27Female70NONever
539S545S049932021-12-28Female62NONever
540S546S044522021-12-28Male68NOPreviously
541S547S051982021-12-28Male77NORecently
542S548S048482021-12-28Male76NOPreviously
543S549S051112021-12-29Male73YESNever
544S550S044452021-12-29Male75NONever
545S551S055432021-12-30Female75NONever
547S552S048162021-12-29Male63NOWithin 6 weeks
548S553S054842021-12-30Male71NORecently
549S554S051782021-12-30Male62NOWithin 6 weeks
552S555S055362022-01-03Male68NOPreviously
558S556S051962022-01-04Male69YESWithin 6 weeks
559S557S055802022-01-04Female50NONever
560S558S050182022-01-04Male58NOWithin 6 weeks
562S559S058952022-01-05Female67NOWithin 6 weeks
564S560S050902022-01-05Male47NOWithin 6 weeks
567S561S059172022-01-06Male53NOWithin 6 weeks
569S562S059022022-01-06Male64NOPreviously
570S563S057912022-01-06Male77NOPreviously
571S564S060282022-01-08Female56NONever
573S565S058452022-01-08Male52NOWithin 6 weeks
575S566R252392022-01-08Male64NOWithin 6 weeks
582S567S059822022-01-11Female79YESNever
586S568S063042022-01-13Male59NOPreviously
588S569T245452022-01-14Male68NOPreviously
590S570S063222022-01-17Female63NONever
601S571S066212022-01-25Female65NONever
603S572S064552022-01-27Male65NOWithin 6 weeks
604S573S067022022-01-26Female66NONever
606S574S066952022-01-26Male72NOWithin 6 weeks
608S575S068052022-01-28Male59NOWithin 6 weeks
611S576S068372022-01-29Male65NOWithin 6 weeks
612S577T300672022-01-29Male69NOPreviously
619S578S068132022-02-09Female62YESNever
628S579S069942022-02-08Female65YESNever

Table S1. Clinical information of 580 patients with histories of coronary heart diseases

Congruence of qLAMP and culture assays

We analyzed 472 patients were conducted qLAMP as well as culture assays (Table S3). In culture assays, although we found 48 bacterial species and 6 fungi species in total, only the eight species in the pathogen panel were taken into account. Totally, 269 of 480 patients were detected 

one of the eight species in culture assays. Among them, 143 of 269 patients obtain the consistent pathogen, that is the pathogen detected by the culture assay was contained in the positive pathogens of qLAMP assays. In details, KP got the highest concordance rate of 86.0%, which was far above other seven pathogens (See details in Table 2).

Eight-pathogen panel of qLAMPNo. of patients
Acinetobacter baumannii (AB)              10
Klebsiella pneumonia (KP)153
Streptococcus pneumonia (SP)32
Staphylococcus aureus (SA)34
Haemophilus influenza (HI)170
Methicillin resistant Staphylococcus (MRSA)51
Stenotrophomonas maltophilia (SM)2
Pseudomonas aeruginosa (PA)26

Table S2. Summary of positive patients on each pathogen in qLAMP assays.

Furthermore, clinical diagnostic outcome of pulmonary infection were taken into account. The clinical diagnostic outcomes were considered as a golden standard. We compared the positive rates of qLAMP and culture assays (Table 3). Objectively, culture assays achieved higher positive rate compared to qLAMP assays in the patients with diagnosis of pulmonary infection. The number of positives and negatives of 71 pulmonary infected (or 507 non-pulmonary infected patients) detected by qLAMP or culture assays were shown in Figure 2.

Figure 1

Figure 2

Case NumberAgeGender
S0699574Male
S0241766Female
S0739872Male
R2853662Male
S0696364Male
T9090662Male
S0762168Male
S0743062Male
S0782372Male
S0756260Male
S0783667Male
S0686061Male
S0740766Male
S0790066Male
S0757270Male
S0802964Male
S0793064Male
S0837563Female
S0827459Male
T2362067Male
S0808173Male
S0827258Female
S0813571Female
T4740072Male
S0846266Female
S0855472Male
S0850968Female
S0856264Female
S0831963Male
S0885168Male
S0830363Female
S0847465Female
S0894369Male
R7575362Female
S0829963Male
R9901861Male
S0915269Male
S0884154Male
S0861068Female
S0891269Male
S0870572Male
S0619263Male
R8777764Male
S0908163Male
S0912656Male
S0907471Male
S0949164Male
S0937367Male
S0837073Female
S0957163Female
S0957865Male
S0970765Female
S0976261Male
S0951063Male
S0865468Male
T2890770Male
S1014767Male
S1006467Female
S1008168Male
S1005967Male
S1018560Male
S0913079Male
S0994478Male
T0880467Female
S1017767Male
S1059966Female
S1034664Male
S1074173Male
S1015466Male
S1088668Female
S1069068Male
S1067358Male
S1071557Male
S1091469Male
S1064770Female
S1053955Male
S1029866Female
S1097167Male
S1096770Female
S1088960Male
S1111072Female
R9761261Male
S1097272Male
S1110275Female
S1083959Female
S1127768Male
T7092267Male
S1141559Male
S1144366Male
S1115572Male
S1149565Female
S1124258Male
S1160474Female
T1436174Male
S1130871Female
S1160848Male
S1179965Male
S1140870Male
S1123379Female
S1171078Male
S1160961Male
S1167574Male
S1192237Male
S1170269Male
S1145379Male
S1128769Male
S1183072Female
S0399965Female
S1199667Male
S1216580Male
S1185274Male
S1190373Male
S1219661Male
S1209054Male
S1187274Female
S1203039Male
S1194572Female
R0765365Male
S1194876Male
S1165164Male
S1161577Male
R3117944Male
S1204164Male
S1243760Male
S1157574Female
S1235865Male
S1156251Male
S1223264Female
R3537866Female
S1249478Male
S1251074Female
S1239463Female
S1261280Female
S1178465Male
S1231769Male
S1227972Male
S1261175Male
S1268576Male
S1246242Male
T0166769Male
S1213270Male
S1279471Male
S1250766Male
S1261769Female
T3465261Male
S1175355Male
S0890866Male
S1269257Male
S1256171Male
T2811964Male
S1304064Male
S1290079Male
S1264368Male
T6381558Male
S1249771Male
S1294261Female
S1296850Male
T6202072Female
S1307064Male
T9223562Female
S1338869Male
S1289972Male
S1316160Male
S1337466Male
S1307570Female
S1348370Female
S1311976Male
S1281855Female
S1309234Male
S1311676Male
T6912359Male
S1354459Male
S1298567Male
S1336370Male
S1332970Male
S1370462Male
S1351070Male
S1357072Male
S1387263Female
S1327371Female
S0575769Female
S1365965Male
S1367667Male
S1400266Male
S1404068Male
S1302968Male
S1379261Male
S1377963Male
S1398265Male
S1422369Male
S1420369Female
S1402076Male
R0692366Male
S1383459Male
S1410270Female
S1380369Female
S1437350Male
S1422650Female
S1431972Male
S1372775Male
S1426860Male
S1408975Female
S1436268Male
S1396976Male
S1422865Male
S1411068Female
S1439968Male
T4980568Female
S1417762Male
S1380867Male
R8025565Male
S1438960Male
S1414167Female
S1450562Male
S1442463Female
S1460763Male
S1450859Male
S1455568Male
S1470266Female
S1448353Male
S1460456Female
S1459759Male
S1370271Male
S1461469Female
S1459270Female
S1469670Male
S1503666Male
S1166855Male
S1516971Female
S1478847Male
S1515179Female
T5869462Male
S0930151Male
S1507756Female
S1471360Female
S1507066Female
S1500868Male
S1358961Male
S1532967Male
S1510460Male
R5687966Female
S1509064Male
S1535464Male
S1536072Male
S1548562Male
S1553860Male
S1527580Male
S1512666Male
S1531446Male
S1501781Male
S1566967Male
S1544066Male
S1552965Male
S1530673Female
S1581972Male
S1566657Male
S1514868Female
S1544167Male
S1545661Male
S1577186Male
S1531661Male
S1575550Male
S1569963Male
S1560161Male
S1582358Male
S1603277Male
S1561768Male
S1476863Male
S1193866Male
S1599963Male
S1614344Male
S1588754Male
S1521478Female
S1590864Male
S1120961Female
S1615970Male
S1580663Male
S1584451Male
S1607970Male
S1638965Male
S1464862Male
S1648569Male
S1630856Female
S1633166Female
S1645973Male
S1629948Male
S1458974Male
S1637366Male
S1663355Male
T4388374Female
S1653769Male
S1619347Male
S1557559Male
S1610065Male
S1696064Male
S1687754Female
T0886463Male
S1646672Female
S1688077Female
S1683048Male
S1674975Male
S1700076Female
S1683962Male
S1679973Male
S1730867Female
S1456167Female
S1692967Female
S1637561Male
S1711270Male
S1708872Male
S1732072Male
S1717242Male
S1712258Female
S1730764Male
S1732262Male
S1730668Female
S1733158Male
S1738153Female
S1715669Male
S1759375Male
S1752864Male
S1743467Male
S1757753Male
S1772769Male
S1714469Female
S1671975Male
S1784876Male
S1782068Female
S1818073Male
T0127476Female
S1803060Female
S1744543Male
S1805747Male
S1785760Male
S1783572Male
S1796969Female
S1771371Male
S1798459Male
S1807557Male
S1807457Male
S1810862Male
R0011878Male
S1657667Male
S1822162Male
S1811865Male
S1833058Female
S1868460Male
R0451964Male
S1828675Male
S1863973Male
S1818371Male
S1849262Male
S1842547Male
S1849871Female
S1833676Male
S1883971Male
T7206768Female
S1839565Male
S1872167Male
S1862764Male
S1887069Male
S1891464Male
S1875567Male
S1892872Male
S1874464Female
S1848066Male
S1910265Female
T0592770Male
S0309959Male
S0285164Male
S0337154Male
T7939555Male
S0214766Male
S0287056Male
S0326061Female
S0262976Male
S0405265Female
R8371175Female
R9852079Male
S0374061Male
S0396060Male
T8095267Male
S0388165Male
S0388868Male
S0389372Male
R0062776Male
S0442868Male
R4764764Male
S0474665Male
S0397863Male
S0326477Female
S0423960Female
S0416361Male
S0393865Female
T9937972Female
T1045161Male
S0434176Male
S0428567Male
S0440166Male
S0215568Male
S0455966Male
S0374759Female
T2793364Female
T6896676Female
S0443967Male
S0527970Female
S0513265Female
S0499362Female
S0445268Male
S0519877Male
S0511173Male
S0444575Male
S0554375Female
S0532167Male
S0481663Male
S0517862Male
S0553667Male
S0516860Male
S0544956Male
S0528364Male
S0519668Male
S0501857Male
S0593074Female
S0589566Male
S0563858Male
S0524857Male
S0591752Male
S0590775Male
S0590267Male
S0579176Male
S0602855Female
S0260761Male
T1419244Male
R2523963Male
S0614169Male
S0349770Female
S0652263Male
T3205171Male
S0595452Male
S0598278Female
R6088261Male
S0622664Male
S0615867Male
S0639875Male
S0608378Male
S0635766Male
S0641667Male
S0649563Male
R6075568Female
S0626473Female
S0662165Female
S0670367Male
S0645564Male
S0670265Female
S0669571Male
S0679568Male
T3006769Male
S0682965Male
S0682276Male
S0701456Male
S0683659Female
S0713570Male
S0681361Female
S0726353Male
S1305476Male
S1735069Male
S1782162Female
S1838663Female
S1888066Male
S0362161Female
S0364274Male
S0374972Male

Table S3. Patients performed qLAMP and culture assays

Demographic and clinical characteristics of qLAMP-detected pulmonary infection comparing with non-pulmonary infection 

Demographic and clinical characteristics of the patients with and without pulmonary infection according to qLAMP assays were shown in Table .Considering the pathogen panel (LP, MP, CP, SP, SA, EC, KP, PA, AB, SM, HI) of qLAMP assays, we analyzed and compared the characteristics or difference between 263 patients with postoperative pulmonary infections (at least one of the eight species in the pathogen panel of qLAMP were detected) and 280 patients without postoperative pulmonary infections (none of the eight species in the pathogen panel of qLAMP were detected).

The statistics analysis involved clinical information and measurements of patients, including age, gender, smoking index, preoperative cardiac function, preoperative oxygenation index, combined basic diseases (pulmonary disease, diabetes), and postoperative tissue oxygen saturation (left SctO2, SmtO2 left forearm measurement).

The results shows significant differences between two groups on age, smoking index, postoperative tissue oxygen saturation (left SctO2 and SmtO2 left forearm measurement).

Demographic and clinical characteristics of clinical diagnosis of pulmonary infection comparing with non-pulmonary infection 

Demographic and clinical characteristics of the patients with and without postoperative pulmonary infection are shown in Table 5.We firstly analyzed and compared the characteristics or difference between 473 patients with postoperative pulmonary infection and 70 patients without postoperative pulmonary infection.  The statistics analysis involved clinical information and measurements of patients, including age, gender, smoking index, preoperative cardiac function, preoperative oxygenation index, and combined basic diseases (pulmonary disease, diabetes). 

There is no significant difference (P>0.05) in the characteristics of the patients between the two groups, including gender, complications, smoking, average cardiac output CO, preoperative oxygen, underlying disease (lung disease and diabetes), and postoperative complications.Only moderate significant difference (P=0.05) between group with age >60 and with age ≤60, indicating the pulmonary infections may present the preference of the elder population.

Conclusion

Here, we report that culture and qLAMP methods were used to identify the potential pathogens that can cause complication in pneumonia. The results show that qLAMP can rapidly and effectively detect pulmonary pathogens and is a rapid diagnostic tool. The authors analyzed clinical characteristics of the patients based on qLAMP results and found associations between age, smoking index, and postoperative tissue oxygen saturation with the occurrence of pulmonary infections.

Discussion

Postoperative pulmonary infection in patients with coronary atherosclerosis affects the mortality rate, and the correct use of antibiotics can effectively alleviate it, so the detection of pathogens is particularly important. Although culture method is the gold standard for identifying bacteria and fungi, it can lead to delays in targeted antibiotic therapy because bacterial cultures often fail to return useful results in a timely manner. qLAMP has advantages in guiding targeted antibiotic therapy for pulmonary infections.

In recent years, loop-mediated isothermal amplification (LAMP) has become increasingly popular, and qLAMP methods are rapid and cost-effective [14]. Because it can operate at a constant temperature, it overcomes the need for expensive instruments such as thermal cyclers [15]. In addition, qLAMP assays excel in terms of time efficiency [14] and can enable healthcare providers to obtain the necessary results in a timely manner to make timely decisions. Therefore, qLAMP can be used as a potential tool for postoperative pulmonary infection screening.

In order to evaluate the value of qLAMP in detecting pulmonary infection, qLAMP was utilized to detect pathogens. Then the congruence between qLAMP and culture method was compared. Among the detected pathogens, the concordance rate of KP was as high as 86.0%, demonstrating the potential of qLAMP for pathogen detection in pulmonary infection. Next, a comparative analysis of qLAMP tests revealed significant differences in age, smoking index, and postoperative tissue oxygen saturation between patients with and without pulmonary infection. Finally, based on clinical diagnostic outcome, it revealed that pulmonary infection may be a preference in the elderly population. The results of the comparative analysis characterize a wealth of demographic and clinical characteristics.

Although quantitative LAMP (qLAMP) is more expensive than routine bacterial culture, the gross cost of the test is easily compensated by its ability to inform more accurate and timely etiological diagnosis. Due to culture-based assays detecting all living bacterial cells, qLAMP takes advantages over rapid and timely detection of representative pathogens in pulmonary infection. 

Inevitably, there are a few limitations in our studies.Firstly, in patients diagnosed with pulmonary infection, the positive rate of culture assay is higher than qLAMP. That indicated that qLAMP should be combined with the culture assasy, rather completely replacing culture assay. Secondly, this study was conducted with a small sample size, and the presence of random effects to some extent affects the conclusions. These limitations provide a novel direction for the research of qLAMP assays.

Here, we used qLAMP assay to quantify the pathogen in samples, then compared the results with culture method. We evaluated the feasibility of qLAMP for postoperative pulmonary infection and revealed the demographic and clinical characteristics of patients with pulmonary infection.

Ethics statement

The study was approved by and carried out under the guidelines of the Ethical Committee of Tianjin Chest Hospital, China. All patients provided written informed consent for the collection of samples and subsequent analysis. The sputum specimens were collected between Dec 2021 and July 2022.

Author contributions

Chang Xie: Data curation, Formal Analysis, Writing original draft; Zhenhua Wu: Data curation, Formal Analysis, Writing original draft; Jie Li: Data curation, Investigation, Formal Analysis; Siyao Dong: Data curation; Yonghong Ren: Formal Analysis; Fanlin Meng:Writing review & editing.

Funding

This work was supported by grants from Tianjin Science and Technology Project (20JCZDJC00810).

References

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