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Journal and News Scan

Source: European Journal of Cardio-Thoracic Surgery
Author(s): Alissa Florian, Johann Auer, Berthold Reichardt, Pavla Krotka, Christine Wagenlechner, Ralph Wendt, Michael Mildner, Julia Mascherbauer, Hendrik Jan Ankersmit, Daniel Zimpfer, Alexandra Graf

In recent years, there has been a trend toward using more bioprosthetic valves compared to mechanical valves in patients under 65 years old. This study evaluated Austrian patients undergoing isolated surgical aortic valve replacement over a 10-year period and compared the outcomes of 1,018 patients receiving mechanical valves to 2,743 receiving a bioprosthetic valves, specifically in patients aged 50 to 65 years. The authors found that the biologic group had significantly higher risks of major adverse cardiac events, reoperation rates, and worsened overall survival compared to the mechanical valve group, which remained true even after propensity matching. Interestingly, stroke and bleeding risks were similar between the groups, which contrasts with reports from other studies. While 92.7 percent of mechanical valve patients received direct thrombin inhibitors, FXa inhibitors, or Vitamin K antagonists, 52.3 percent of bioprosthetic valve patients also received these medications. The authors suggest that careful consideration of the risks vs benefits of aortic valve choice, especially in younger patients, is warranted in light of their findings. 

Source: European Heart Journal
Author(s): Michael Graber, Can Gollmann-Tepeköylü, Victor Schweiger, Jakob Hirsch, Leo Pölzl, Felix Nägele, Daniela Lener, Hubert Hackl, Sieghart Sopper, Elke Kirchmair, Sophia Mair, Jakob Voelkl, Christina Plattner, Felix Eichin, Zlatko Trajanoski, Anne Krogsdam, Jonas Eder, Manuel Fiegl, Dominik Hau, Ivan Tancevski, Michael Grimm, John P Cooke, Johannes Holfeld

This study examined the effects of cardiac shockwave therapy (SWT) on heart function in patients with ischemic cardiomyopathy. The researchers found that SWT activates Toll-like receptor 3 (TLR3), which plays a key role in reprogramming cardiac fibroblasts into endothelial-like cells. In both human cells and a mouse model, SWT increased the expression of endothelial markers and led to the formation of vessel-like structures. In mice with coronary artery occlusion, SWT promoted fibroblast-to-endothelial transdifferentiation, reduced scar size, and improved left ventricular function. Single-cell RNA sequencing confirmed the presence of a distinct population of fibroblasts transitioning toward an endothelial phenotype. Chromatin analysis showed that SWT increased DNA accessibility in over 1,700 genomic regions, supporting the concept of epigenetic remodeling. Overall, SWT appears to enhance myocardial repair by activating innate immune signaling and promoting vascular regeneration. These findings suggest that SWT could become a valuable noninvasive therapy for improving perfusion and function in ischemic hearts. 

Source: Journal of Pediatric Cardiology
Author(s): Sameh M. Said, Yasin Essa, Ali H. Mashadi, Geetha Rajendran, Angela Silber, Alexander Mittnacht, Bianca-Nandini Jambhekar, Sangeeta Kumaraswami, Alexandra Linder, Katherine Glover, Melanie Leong, Matthew Pinto, Aalok R. Singh, Kar-Mei Chan, Bhupen Mehta, Supriya Jain, Eric Fethke & Erika B. Rosenzweig

In this article, the authors describe a novel strategy for neonates with hypoplastic left heart syndrome (HLHS) and intact atrial septum (IAS). Due to the emergency need for creating unrestrictive atrial communication in these patients, traditional interventions include fetal balloon atrial septostomy or postnatal transcatheter, surgical, or hybrid interventions. However, none of these interventions have been associated with excellent results for HLHS/IAS, resulting in dismal outcomes for these patients.  

 The authors present a case of a neonate with a fetal diagnosis of HLHS/IAS, in which they planned an elective cesarean section at 38 weeks. During the procedure, they performed an open atrial septectomy using a bicaval inflow occlusion technique while the baby was mid-delivery, as a part of the ex utero intrapartum treatment (EXIT) procedure. The procedure was uneventful, and it was followed the next day with Stage I Norwood/Sano palliation. The patient did extremely well, was discharged two weeks later, and continues to do well during his follow-up visits. This approach is both novel and logistic for this challenging group of patients, and the authors hope it will open the door for similar patients in the future. 

Source: Interdisciplinary Cardiovascular and Thoracic Surgery
Author(s): Fabrizio Minervini, Pietro Bertoglio, Willem Hans Steup, Stijn Vanstraelen, Sridhar Rathinam, Nuria Maria Novoa, Hermien Schreurs

This recent European Society of Thoracic Surgery (ESTS) survey, conducted via the Fit2Perform working group, highlights critical insights into the well-being and mental health of thoracic surgeons across Europe. The study shows that a significant proportion of surgeons experience emotional exhaustion, depression risk, and burnout, with younger surgeons being particularly vulnerable. These findings underscore the urgent need for institutional support systems, mental health resources, and strategies to foster resilience, especially for junior and younger members of the surgical team. 

Source: European Journal of Cardio-Thoracic Surgery
Author(s): Hristian Hinkov, Luise Roehrich, Chong Bin Lee, Christoph Klein, Marian Kukucka, Nicolas Merke, Volkmar Falk, Henryk Dreger, Christoph Knosalla, Felix Schoenrath, Axel Unbehaun

With the improvement in survival rates for heart transplant recipients, cardiac valvular disease is more frequently being encountered in this group of patients. This includes conditions such as aortic stenosis and mitral regurgitation in the transplanted heart. This article discusses the role of transcatheter-based therapies, including transcatheter aortic valve implantation (TAVI) and mitral transcatheter edge-to-edge repair (M-TEER), in heart transplant recipients. Fifteen patients were studied, with nine undergoing TAVI and six receiving M-TEER. The authors found these procedures to be feasible and efficient in improving echocardiographic allograft function, reporting a median survival of two years post-elective procedures. However, survival outcomes were found to be dependent on the urgency of the intervention performed. 

Source: The Annals of Thoracic Surgery
Author(s): Lucy Nam, Ruby Singh, Sameer A. Hirji, Vivian Nguyen, Asishana A. Osho, Arminder S. Jassar, Sary F. Aranki, David A. D’Alessandro, Thoralf M. Sundt, Jordan P. Bloom

This multi-institutional study analyzed 10,607 patients who underwent surgical aortic valve replacement between 2002 and 2023 to assess the prevalence, predictors, and outcomes of prosthesis-patient mismatch (PPM). PPM was present in 22 percent of patients at a moderate level (effective orifice area indexed [EOAi] ≤0.85 cm²/m²) and in 2 percent at a severe level (EOAi ≤0.65 cm²/m²), while 76 percent had no PPM. Over the last decade, the prevalence of PPM declined from 31 percent to 18 percent (P < 0.05), coinciding with an increase in average valve size from 23 mm to 24 mm and a rise in annular enlargement procedures from 2.4 percent to 6 percent (both P < .05). PPM was significantly associated with increased 30-day mortality (odds ratio [OR] 1.46; 95 percent CI, 1.13–1.88) and worse long-term survival. Age- and sex-stratified analysis revealed a stronger association between advanced age and PPM risk in women compared to men (odds ratio, 2.31 vs 1.66 for age >74 vs <65 years; both P < .05). In conclusion, while the prevalence of PPM has declined due to technical improvements and evolving patient selection, it remains a significant predictor of adverse outcomes. These findings highlight the importance of tailored surgical strategies, particularly in older female patients. 

Source: European Journal of Cardio-Thoracic Surgery
Author(s): Marco Gemelli, Thanakorn Rojanathagoon, Jef van den Eynde, Enrico G Italiano, Tea Lena, Michel Pompeu Sá, Vito D Bruno, Manraj Sandhu, Robert Pruna-Guillen, Aung Y Oo, Martin Czerny, Michele Gallo, Mark S Slaughter, Vincenzo Tarzia, Eltayeb Mohamed Ahmed, Cha Rajakaruna, Gino Gerosa

This meta-analysis evaluated the performance of The German Registry of Acute Aortic Dissection Type A (GERAADA) score in predicting 30-day mortality after type A acute aortic dissection (TAAAD) surgery across 11 studies. With an observed mortality of 12.2 percent, GERAADA showed moderate discrimination (AUC 0.70) and good calibration, with a pooled expected mortality of 18.4 percent compared to EuroSCORE II's 5.8 percent. When both scores were directly compared in five studies, GERAADA showed better calibration than EuroSCORE II, while the discrimination between the two remained similar. The study concludes GERAADA offers better calibration for predicting 30-day postoperative mortality following TAAAD and highlights the challenges of predicting outcomes in complex cases. 

Source: Circulation
Author(s): Katherine G. Phillips, Imad Aljabban, Daniel H. Wolbrom, Adam Griesemer, Marzia Leacche, Christopher McGregor, Nader Moazami

Increasing demand for donor hearts in cardiac transplantation has spurred interest in xenotransplantation aided by advancements in immunosuppression and genetic engineering. Clinical trials of genetically modified pig hearts have seen two patients survive 40 and 60 days before graft failure. Research is now focusing on assessing xenografts in brain-dead recipients. Despite progress, challenges such as adaptive immune responses remain. Recent xenotransplantations at the University of Maryland mark important advancements, offering a promising solution to the growing organ donor shortage. This review offers a comprehensive evaluation of the recent advances, persistent challenges, and future potential of cardiac xenotransplantation, with an emphasis on translating preclinical innovations into clinical practice. 

Source: The Annals of Thoracic Surgery
Author(s): Mark Shacker, Andrew Keogan, Lucas Wang, Sreeja Biswas Roy, Ashwini Arjuna, Rajat Walia, Samad Hashimi, Ross M. Bremner, Lara W. Schaheen, Jasmine Huang, Michael A. Smith

This retrospective study analyzed outcomes of 970 bilateral lung transplant recipients at a single center from 2007–2023, stratified by age groups: 15–64, 65–69, 70–74, and 75–years. Findings showed that older recipients (greater than or equal to 65 years) had similar short-term outcomes, including 1-year survival rates, compared to younger patients, despite longer hospital stays and less frequent need for extracorporeal membrane oxygenation (ECMO) at 72 hours post-transplant. Median survival decreased with age: 6.1 years (15–64), 4.8 years (65–69), 4.7 years (70–74), and 4.5 years (75–79). Five-year survival rates were 58.0 percent, 46.8 percent, 44.5 percent, and 47.2 percent, respectively. Causes of death varied with age; graft failure was more common in younger patients, while infection, malignancy, and cardiovascular disease predominated in older groups. This study highlights the increasing acceptance of lung transplantation in elderly patients, especially those aged 70–74, demonstrating that careful selection can yield acceptable perioperative outcomes and that advanced age should not be considered an absolute contraindication for lung transplantation. 

Source: The Journal of Heart and Lung Transplantation
Author(s): Jon Kobashigawa, Andreas Zuckermann, Adriana Zeevi, Markus J. Barten, Patricia P. Chang, Monica Colvin, Guillaume Coutance, Anne Dipchand, Stephan Ensminger, Marta Farrero, Marlena Habal, Anne Halpin, Annette M. Jackson, Yosef Manla, Kavitha Muthiah, Luciano Potena, Elaine F. Reed, Kelly Schlendorf, Palak Shah, Anat Tambur, Simon Urschel, Steven Webber, Lori West, Jong-Chan Youn, Jignesh Patel

This recently published consensus statement, endorsed by multiple transplant societies including the International Society for Heart and Lung Transplantation (ISHLT), aims to address the existing gaps in consensus regarding the role of circulating antibodies and their relationship to antibody-mediated rejection in heart transplantation. The conclusions summarize the cut-offs for risk stratification and management of pre-transplant detected antibodies, the importance of special donor considerations and physical prospective crossmatches, the role of desensitization protocols, perioperative management, post-transplant antibody monitoring, and immunosuppression strategies. The consensus seeks to establish a more standardized approach that bridges current knowledge gaps and facilitates more structured research going forward. 

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