Overcoming Whale Tail Anatomy: Cardiac CT-Guided LAA Occlusion Using the Sandwich Deployment Technique

Case Report | DOI: https://doi.org/10.31579/2641-0419/496

Overcoming Whale Tail Anatomy: Cardiac CT-Guided LAA Occlusion Using the Sandwich Deployment Technique

  • Alex P. Rordriguez *
  • Ambar Quinones Vicenty
  • Michael D. Dyal

Director Advanced Cardiac Imaging and Echocardiography Laboratory Cardiology Section, Specialty Department Miami VA Healthcare System.

*Corresponding Author: Alex P. Rodriguez, Director Advanced Cardiac Imaging and Echocardiography Laboratory Cardiology Section, Specialty Department Miami VA Healthcare System.

Citation: Alex P. Rordriguez, Ambar Quinones Vicenty, Michael D. Dyal, (2025), Overcoming Whale Tail Anatomy: Cardiac CT-Guided LAA Occlusion Using the Sandwich Deployment Technique, J Clinical Cardiology and Cardiovascular Interventions, 8(11); DOI:10.31579/2641-0419/496

Copyright: © 2025, Alex P. Rodriguez. 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: 03 July 2025 | Accepted: 21 July 2025 | Published: 28 July 2025

Keywords: left atrial appendage; whale tail morphology; cardiac computed tomography; sandwich deploy technique

Abstract

anticoagulation. However, anatomical variants such as the bilobar “whale-tail” morphology pose unique challenges for successful percutaneous exclusion. We present a case in which multimodality imaging, including transesophageal echocardiography (TEE), 3D reconstruction, and cardiac computed tomography angiography (CTA)—was critical for procedural planning and execution. A tailored “sandwich” deployment technique, previously described in chicken-wing morphologies, was adapted to achieve secure closure of the whale-tail LAA. To our knowledge, this represents the first reported case of this technique being employed for this specific configuration. This case illustrates the importance of individualized, image-guided strategies in managing anatomically complex LAA morphologies and expands the application of advanced closure techniques.

Introduction

An 83-year-old man was referred for non-pharmacologic stroke risk reduction in atrial fibrillation due to recurrent falls and head trauma, without intracranial bleeding. His CHA₂DS₂-VASc score was 5 and HAS-BLED score 4.

Transesophageal echocardiography (TEE) revealed a whale-tail morphology of the left atrial appendage (LAA) (Figures 1 and 2), with a shallow superoanterior lobe and an inferior lobe with a narrow neck. An inferoposterior transseptal puncture was attempted, but resulted in unstable device positioning with persistent patency of the superoanterior lobe. The procedure was aborted after failure to meet Amulet CLOSE criteria (Figure 3).

Figure 1: 2D Transesophageal multiplane images at different angles.  Figure 1C and 1D demonstrating the whale-tail appendage morphology.

Figure 2: Multimodality transesophageal echocardiographic assessment of the mitral valve.

Top panel: Real-time 3D TEE en face view of the left atrial perspective demonstrating the whale tail morphology (★).  Bottom panel: Multislice reconstruction of 3D TEE dataset shows detailed short-axis views at the level of the LAA ostium to the tip.

A close-up of a medical scan

AI-generated content may be incorrect.

Figure 3: Multimodality imaging of a whale-tail left atrial appendage (LAA). Top Row: TEE images at the time of the orginal transseptal puncture -inferior and posterior.Bottom row: fluoroscopic frame showing contrast injection into a bilobar whale-tail LAA via a delivery sheath with significant opacification of one of the lobes. Note the bilobar structure and narrow neck of the inferior lobe, targeted for lobe anchoring in the sandwich technique.

While the sandwich technique has been reported in patients with chicken wing LAA morphology (Sogabe et al., 2021), whale-tail anatomy remains a procedural challenge. Prior cases have required separate devices for each lobe, increasing the risk of embolization and complexity (Hecht, 2021).

Cardiac CT angiography (CTA) confirmed the bilobar morphology and revealed that the inferior lobe had a chicken wing configuration with a narrow neck, suitable for Amulet lobe deployment. CTA also facilitated planning of a more anterior-superior transseptal puncture (Figures 4 and 5) and informed the use of the sandwich technique—deploying the lobe into the inferior lobe and positioning the disc over the superoanterior lobe.

Figure 4: Cardiac CTA revealing the main lobe and anteromedial lobe.

A picture containing indoor, fireplace

AI-generated content may be incorrect.

Figure 5: CTA facilitating planning of a “mid-mid” transseptal puncture, rather than inferoposterior as previously described, and the successful deployment and LAA exclusion.

During the procedure, the lobe was deployed distal to the left circumflex artery with appropriate compression. The disc and lobe were adequately separated, with the disc assuming an elliptical (concave) configuration. Mild coaxial deviation between the disc and lobe was expected. Color Doppler showed no peri-device or intra-device flow, confirming successful LAA exclusion (Figure 6). Follow-up CTA demonstrated stable device position without thrombus, hypoattenuated leaflet thickening (HALT), or leaks on early and delayed imaging. The LAA remained completely excluded (Figure 7).

Diagram

AI-generated content may be incorrect.

Figure 6: 3D Volume rendered images of the initial LAA (6A) and the excluded appendage with an Amulet device in position.

Discussion:

Our case underscores the role, and often critical importance, of pre-procedural planning in left atrial appendage occlusion procedures. Such procedure entails the thorough understanding of all the nuances in every step, extending from femoral access, followed by trans-septal puncture, left atrial and left atrial appendage anatomy, exclusion of an intracardiac thrombus, as well as the involved catheters, their lengths, and angulations.  Therefore, systematic preprocedural planning not only helps optimize intraprocedural timing, but also in ensuring successful closure while mitigating potential complication risks. 

Multiple publications have previously discussed these issues.  Prior reviews have extensively discussed the utility of pre-procedural cardiac CTA as part of the patient candidacy evaluation process for both Watchman (Hecht, 2021) and Amulet (Buysschaert & Viaene, 2021) devices.  Current CTAs provide excellent temporal and spatial resolution which allows close evaluation of the LAA throughout the cardiac cycle, preferentially in 10% R-R increments.  The LAA ostium, landing zone, and depth can, therefore, be accurately measured aiming to minimize procedural under-sizing, which which may lead to peri-device leaks or embolization.

With the advent of artificial intelligence, such tools have been tested to determine whether there is additional value in artificial intelligence-enabled, CT-based computational model.  The PREDICT-LAA was a prospective, multicenter, randomized trial evaluating anatomical analysis.  The patients randomized to the computer AI simulated group experienced higher rates of optimal appendage exclusion without leaks, less device-related thrombus, lower intraprocedural radiation doses, and improved procedural efficiency with fewer Amulet devices, and fewer repositioning attempts (Buysschaert & Viaene, 2021).

Similarly, a retrospective study evaluated the accuracy of cardiac CTA evaluation compared to intraprocedural 3D-TEE imaging of the left atrial appendage at the time of device implantation (Ranard et al., 2022). This study evaluated whether CTA based AI simulations could accurately predict the appropriate device size, location, and compression.  In three quarter of the reviewed patients, 3D TEE measurements were not significantly different to those from CT, and no patient having a significant peridevice leak. Yet, the study acknowledges that further studies are required to evaluate whether computation modeling can improve confidence in sizing, positioning, and compression without compromising technical success. 

In our case, due to logistics, the patient was unable to obtain a cardiac CTA prior to the LAAO procedure.  The intraprocedural TEE revealed the patient’s particular anatomy and despite attempts to reposition the device, it remained suboptimal for implantation either unstable or with a large leak involving one of the lobes. The cardiac CTA allowed accurate measurement of both atria, evaluation of the interatrial septum's relationship to the LAA, and precise assessment of LAA morphology and dimensions. Accounting for all these, it was determined that an Amulet device in a “sandwich technique” could potentially exclude both lobes.  The dual occlusive mechanism of the Amulet occluder could further facilitate successful closure, even in this challenging anatomic scenario.

The sandwich technique has been previously described mostly for chicken wing left atrial appendage anatomy (Freixa et al., 2021). Unlike the conventional Amplatzer Amulet implantation, this technique involves the positioning of the device lobe along the length of the LAA “wing” creating a sandwich between the lobe and the appendage wall.  In large patient series, this has been found to be a feasible and safe (Freixa et al., 2021).  To the best of our knowledge, this is the first documented case of successful closure of a whale-tail appendage morphology.

Conclusion:

This case underscores the pivotal role of advanced multimodality imaging in characterizing complex left atrial appendage (LAA) morphologies, such as the whale-tail configuration, which can present unique challenges for percutaneous closure. Real-time 3D transesophageal echocardiography and cardiac CTA provided complementary anatomical detail, enabling precise transseptal puncture planning and individualized device deployment. Notably, the sandwich deployment technique—previously described in the setting of chicken-wing morphology—was successfully adapted in this case for exclusion of a bilobar whale-tail LAA. To the best of our knowledge, this represents a novel application of the technique for this specific anatomy. As structural interventions continue to evolve, integrating high-resolution imaging with procedural innovation will be critical to optimizing outcomes in anatomically complex LAA cases. Further studies are warranted to explore the reproducibility and long-term performance of such strategies in diverse morphologies.

References

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Dr Farahnaz Fallahian

Dear Maria Emerson, Editorial Coordinator, International Journal of Clinical Case Reports and Reviews, Auctores Publishing LLC. I am delighted to have published our manuscript, "Acute Colonic Pseudo-Obstruction (ACPO): A rare but serious complication following caesarean section." I want to thank the editorial team, especially Maria Emerson, for their prompt review of the manuscript, quick responses to queries, and overall support. Yours sincerely Dr. Victor Olagundoye.

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Dr Victor Olagundoye

Dear Ashley Rosa, Editorial Coordinator, International Journal of Clinical Case Reports and Reviews. Many thanks for publishing this manuscript after I lost confidence the editors were most helpful, more than other journals Best wishes from, Susan Anne Smith, PhD. Australian Breastfeeding Association.

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Dr Susan Anne Smith

Dear Agrippa Hilda, Editorial Coordinator, Journal of Neuroscience and Neurological Surgery. The entire process including article submission, review, revision, and publication was extremely easy. The journal editor was prompt and helpful, and the reviewers contributed to the quality of the paper. Thank you so much! Eric Nussbaum, MD

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Dr Eric S Nussbaum

Dr Hala Al Shaikh This is to acknowledge that the peer review process for the article ’ A Novel Gnrh1 Gene Mutation in Four Omani Male Siblings, Presentation and Management ’ sent to the International Journal of Clinical Case Reports and Reviews was quick and smooth. The editorial office was prompt with easy communication.

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Hala Al Shaikh

Dear Erin Aust, Editorial Coordinator, Journal of General Medicine and Clinical Practice. We are pleased to share our experience with the “Journal of General Medicine and Clinical Practice”, following the successful publication of our article. The peer review process was thorough and constructive, helping to improve the clarity and quality of the manuscript. We are especially thankful to Ms. Erin Aust, the Editorial Coordinator, for her prompt communication and continuous support throughout the process. Her professionalism ensured a smooth and efficient publication experience. The journal upholds high editorial standards, and we highly recommend it to fellow researchers seeking a credible platform for their work. Best wishes By, Dr. Rakhi Mishra.

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Dr Rakhi Mishra

Dear Jessica Magne, Editorial Coordinator, Clinical Cardiology and Cardiovascular Interventions, Auctores Publishing LLC. The peer review process of the journal of Clinical Cardiology and Cardiovascular Interventions was excellent and fast, as was the support of the editorial office and the quality of the journal. Kind regards Walter F. Riesen Prof. Dr. Dr. h.c. Walter F. Riesen.

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Dr Walter F Riesen

Dear Ashley Rosa, Editorial Coordinator, International Journal of Clinical Case Reports and Reviews, Auctores Publishing LLC. Thank you for publishing our article, Exploring Clozapine's Efficacy in Managing Aggression: A Multiple Single-Case Study in Forensic Psychiatry in the international journal of clinical case reports and reviews. We found the peer review process very professional and efficient. The comments were constructive, and the whole process was efficient. On behalf of the co-authors, I would like to thank you for publishing this article. With regards, Dr. Jelle R. Lettinga.

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Dr Jelle Lettinga

Dear Clarissa Eric, Editorial Coordinator, Journal of Clinical Case Reports and Studies, I would like to express my deep admiration for the exceptional professionalism demonstrated by your journal. I am thoroughly impressed by the speed of the editorial process, the substantive and insightful reviews, and the meticulous preparation of the manuscript for publication. Additionally, I greatly appreciate the courteous and immediate responses from your editorial office to all my inquiries. Best Regards, Dariusz Ziora

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Dariusz Ziora