A study of ChatGPT in facilitating Heart Team decisions on severe aortic stenosis.

BACKGROUND: Multidisciplinary Heart Teams (HTs) play a central role in the management of valvular heart diseases. However, the comprehensive evaluation of patients' data can be hindered by logistical challenges, which in turn may affect the care they receive. AIMS: This study aimed to explore the ability of artificial intelligence (AI), particularly large language models (LLMs), to improve clinical decision-making and enhance the efficiency of HTs. METHODS: Data from patients with severe aortic stenosis presented at HT meetings were retrospectively analysed. A standardised multiple-choice questionnaire, with 14 key variables, was processed by the OpenAI Chat Generative Pre-trained Transformer (GPT)-4. AI-generated decisions were then compared to those made by the HT. RESULTS: This study included 150 patients, with ChatGPT agreeing with the HT's decisions 77% of the time. The agreement rate varied depending on treatment modality: 90% for transcatheter valve implantation, 65% for surgical valve replacement, and 65% for medical treatment. CONCLUSIONS: The use of LLMs offers promising opportunities to improve the HT decision-making process. This study showed that ChatGPT's decisions were consistent with those of the HT in a large proportion of cases. This technology could serve as a failsafe, highlighting potential areas of discrepancy when its decisions diverge from those of the HT. Further research is necessary to solidify our understanding of how AI can be integrated to enhance the decision-making processes of HTs.

Therapeutic reconditioning of damaged lungs by transient heat stress during ex vivo lung perfusion.

Ex vivo lung perfusion (EVLP) may serve as a platform for the pharmacologic repair of lung grafts before transplantation (LTx). We hypothesized that EVLP could also permit nonpharmacologic repair through the induction of a heat shock response, which confers stress adaptation via the expression of heat shock proteins (HSPs). Therefore, we evaluated whether transient heat application during EVLP (thermal preconditioning [TP]) might recondition damaged lungs before LTx. TP was performed during EVLP (3 hours) of rat lungs damaged by warm ischemia by transiently heating (30 minutes, 41.5 °C) the EVLP perfusate, followed by LTx (2 hours) reperfusion. We also assessed the TP (30 minutes, 42 °C) during EVLP (4 hours) of swine lungs damaged by prolonged cold ischemia. In rat lungs, TP induced HSP expression, reduced nuclear factor κB and inflammasome activity, oxidative stress, epithelial injury, inflammatory cytokines, necroptotic death signaling, and the expression of genes involved in innate immune and cell death pathways. After LTx, heated lungs displayed reduced inflammation, edema, histologic damage, improved compliance, and unchanged oxygenation. In pig lungs, TP induced HSP expression, reduced oxidative stress, inflammation, epithelial damage, vascular resistance, and ameliorated compliance. Collectively, these data indicate that transient heat application during EVLP promotes significant reconditioning of damaged lungs and improves their outcomes after transplantation.

How to Solve the Conundrum of Heparin-Induced Thrombocytopenia during Cardiopulmonary Bypass.

Heparin-induced thrombocytopenia (HIT) is a major issue in cardiac surgery requiring cardiopulmonary bypass (CPB). HIT represents a severe adverse drug reaction after heparin administration. It consists of immune-mediated thrombocytopenia paradoxically leading to thrombotic events. Detection of antibodies against platelets factor 4/heparin (anti-PF4/H) and aggregation of platelets in the presence of heparin in functional in vitro tests confirm the diagnosis. Patients suffering from HIT and requiring cardiac surgery are at high risk of lethal complications and present specific challenges. Four distinct phases are described in the usual HIT timeline, and the anticoagulation strategy chosen for CPB depends on the phase in which the patient is categorized. In this sense, we developed an institutional protocol covering each phase. It consisted of the use of a non-heparin anticoagulant such as bivalirudin, or the association of unfractionated heparin (UFH) with a potent antiplatelet drug such as tirofiban or cangrelor. Temporary reduction of anti-PF4 with intravenous immunoglobulins (IvIg) has recently been described as a complementary strategy. In this article, we briefly described the pathophysiology of HIT and focused on the various strategies that can be applied to safely manage CPB in these patients.

Challenges in Patient Blood Management for Cardiac Surgery: A Narrative Review.

About 15 years ago, Patient Blood Management (PBM) emerged as a new paradigm in perioperative medicine and rapidly found support of all major medical societies and government bodies. Blood products are precious, scarce and expensive and their use is frequently associated with adverse short- and long-term outcomes. Recommendations and guidelines on the topic are published in an increasing rate. The concept aims at using an evidence-based approach to rationalize transfusion practices by optimizing the patient's red blood cell mass in the pre-, intra- and postoperative periods. However, elegant as a concept, the implementation of a PBM program on an institutional level or even in a single surgical discipline like cardiac surgery, can be easier said than done. Many barriers, such as dogmatic ideas, logistics and lack of support from the medical and administrative departments need to be overcome and each center must find solutions to their specific problems. In this paper we present a narrative overview of the challenges and updated recommendations for the implementation of a PBM program in cardiac surgery.

The transcervical access for transcatheter aortic valve replacement.

Alternative accesses for transcatheter aortic valve replacement (TAVR) are needed in a certain number of patients, who present contraindications to the standard transfemoral access. We present the transcervical approach, which allows to access the aortic valve via supra-aortic vessels, namely, the brachiocephalic trunk, carotid artery, or subclavian artery. This approach is interesting because it avoids thoracotomy, which is necessary with some other alternative approaches for TAVR, such as the transaortic or transapical ones. Although some points still need clarification, such as the best anesthesia modality (general or local) or the optimal side for vessel access, data suggest the transcervical access might yield similar periprocedural and 30-day outcomes compared with the transfemoral access. Herein, we describe the surgical technique that was developed in our institution for transcervical access.

[Sutureless and rapid-deployement valves for aortic valve replacement: the ideal compromise ?] / Les valves sutureless et à déploiement rapide dans le remplacement valvulaire aortique: le compromis idéal ?

For a decade, aortic valve replacement (AVR) surgery has been simplified thanks to the development of sutureless or rapid deployment valves (SU-RD valves), which offer an alternative to sutured valves. These SU-RD valves, inspired by the TAVI (Transcatheter Aortic Valve Implantation), allow significant operating time reduction and facilitate minimally invasive surgery. They are particularly indicated for patients that are more fragile and in combined procedures (for example AVR associated with coronary bypass surgery). Recent studies report high reliability and excellent outcomes with lower morbidity and mortality compared to other AVR modalities, including TAVI. Considering the constant technical improvement, SU-DR valves may become the new standard in AVR.

Depuis une décennie, la chirurgie du remplacement valvulaire aortique (RVA) s'est simplifiée grâce à l'apparition de valves dites « sutureless ¼ ou à « déploiement rapide ¼ (valves SU-DR) qui offrent une alternative aux valves suturées. Ces valves SU-DR, inspirées du Transcatheter Aortic Valve Implantation (TAVI), permettent un gain de temps opératoire important et facilitent la chirurgie mini-invasive. Elles sont notamment indiquées chez les patients plus fragiles et lors de procédures combinées (par exemple, RVA et pontages coronariens associés). Des études récentes rapportent une grande fiabilité et d'excellents résultats avec une moindre morbi-mortalité par rapport aux autres modalités de RVA, y compris le TAVI. Considérant l'amélioration technique constante, les valves SU-RD pourraient bien devenir le nouveau standard dans le RVA.

Impact of an enhanced recovery after surgery pathway on thoracoscopic lobectomy outcomes in non-small cell lung cancer patients: a propensity score-matched study.

BACKGROUND: This study evaluates the effect of enhanced recovery after surgery (ERAS) pathways on postoperative outcomes of non-small cell lung cancer (NSCLC) patients undergoing video-assisted thoracic surgery (VATS) lobectomy. METHODS: We retrospectively reviewed all consecutive patients undergoing VATS lobectomy for NSCLC between January 2014 and October 2019 and assigned them to the relevant group ("pre-ERAS" or "ERAS"). Length of stay, readmissions and complications within 30 days were compared between both groups. A propensity score-matched analysis was performed based on sex, age, type of operation, comorbidities, American Society of Anesthesiologists (ASA) score and preoperative pulmonary functions. RESULTS: A total of 307 records (164 male/143 female; 140 ERAS/167 pre-ERAS; median age: 67) were reviewed. There was no statistical difference in patient's characteristics. Overall ERAS compliance was 81%. The ERAS group presented significantly shorter length of stay (median 5 vs. 7 days; P=0.004) without significant difference in cardiopulmonary complication rate (27.1% vs. 35.9%; P=0.1). Readmission (3.6% vs. 5.4%; P=0.75) and duration of drainage (median 2 vs. 3 days; P=0.14) were similar between groups. The propensity score-matched analysis showed that the length of hospital stay was reduced by 1.4 days (P=0.034) and the postoperative cardiopulmonary complication rate by 13% (P=0.044) in the ERAS group. CONCLUSIONS: Adoption of an ERAS pathway for VATS lobectomies in NSCLC patients has decreased the length of hospital stay and the cardiopulmonary complication rate without affecting the readmission rate.

Short-term single-centre experience with the HeartMate 3 left ventricular assist device for advanced heart failure.

OBJECTIVES: The objective of this study was to analyse clinical characteristics, survival and adverse events of patients with advanced heart failure supported using the Abbott HeartMate 3 left ventricular assist device (LVAD). METHODS: We retrospectively reviewed 42 consecutive HeartMate 3 recipients implanted in our centre between 1 November 2015 and 31 October 2019. RESULTS: Our series comprised 39 males, aged 56.7 ± 11.8 years. Eleven (26%) patients had preimplant INTERMACS clinical profiles of 1 or 2. The mean duration support was 14.0 ± 10.6 months (range 0.69-44 months). During follow-up, 4 (10%) patients died while on support, 13 (35%) patients received a heart transplant and 25 patients are still ongoing. Actuarial survival after LVAD implantation was 88.4 ± 5.5% and 84.4 ± 6.6% at 1 and 2 years, respectively. There were no cases of pump thrombosis or technical malfunction. Seven (17%) patients required post-implant temporary right ventricular support. Adverse events included bleeding requiring surgery in 13 (31%) patients, gastrointestinal bleeding in 6 (14%) patients, LVAD-specific infections in 19 (45%) patients and non-disabling ischaemic stroke in 5 (12%) patients. The incidence of ischaemic stroke was significantly higher in patients where the outflow graft was anastomosed to the descending aorta as compared to those where it was anastomosed to the ascending aorta (P < 0.003). CONCLUSIONS: We have observed satisfactory survival rates using the HeartMate 3 LVAD for long-term mechanical circulatory support. The absence of technical failure, pump thrombosis, haemolysis or need for pump exchange during our 4-year experience confirms its technical reliability and improved haemocompatibility, but bleeding complications and infections remain a concern.

Impact of Compliance With Components of an ERAS Pathway on the Outcomes of Anatomic VATS Pulmonary Resections.

OBJECTIVES: Implementation of an Enhanced Recovery After Surgery (ERAS) program is associated with better postoperative outcomes. The aim of this study was to evaluate the impact of ERAS compliance (overall and to specific elements of the program) on them. DESIGN: Retrospective analysis of prospectively collected data. SETTING: University hospital, monocentric. PARTICIPANTS: All adult (≥18 years old) patients undergoing video-assisted thoracic surgery (VATS) anatomic pulmonary resection. INTERVENTIONS: ERAS-governed VATS anatomic pulmonary resection. MEASUREMENTS AND MAIN RESULTS: Demographics, surgical characteristics and pre-, peri-, and postoperative compliance with 16 elements of the ERAS program were assessed. Postoperative outcomes and length of stay were compared between low- (<75% of adherence) and high-compliance (≥75%) groups. From April 2017 to November 2018, 192 ERAS patients (female/male: 98/94) of median age of 66 years (interquartile range 58-71) underwent VATS resection (109 lobectomies, 83 segmentectomies). There was no 30-day mortality and resurgery rate was 5.7%. Overall ERAS compliance was 76%. High compliance was associated with fewer complications (18% v 48%, p < 0.0001) and lower rate of delayed discharge (37% v 60%, p = 0.0013). Early removal of chest tubes (odds ratio [OR]: 0.26, p < 0.002), use of electronic drainage (OR: 0.39, p = 0.036), opioid cessation on day 3 (OR: 0.28, p = 0.016), and early feeding (OR: 0.12, p = 0.014) were associated with reduced rates of postoperative complications. Shorter hospital stay was correlated with early removal of chest tubes (OR: 0.12, p < 0.0001) and opioid cessation on day 3 (OR: 0.23, p = 0.001). CONCLUSIONS: High ERAS compliance is associated with better postoperative outcomes in patients undergoing anatomic pulmonary VATS resections.