Preclinical Large Animal In-Vivo Experiments for Surgically Implanted Atrioventricular Valve: Reappraisal and Systematic Review.

BACKGROUND: The development of atrioventricular bioprosthesis has witnessed an increasing drive toward clinical translation over the last few decades. A significant challenge in the clinical translation of an atrioventricular bioprosthesis from bench to bedside is the appropriate choice of a large animal model to test the safety and effectiveness of the device. METHODS: We conducted a systematic review of pre-clinical in vivo studies that would enable us to synthesize a recommended framework. PRISMA (Preferred Reporting Items for Systematic Reviews and MetaAnalyses) guidelines were followed to identify and extract relevant articles. RESULTS: Sheep was the most common choice of animal, with nine out of the 12 included studies being conducted on sheep. There were acute and chronic studies based on our search criteria. An average of ~20 and 5 animals were used for chronic and acute studies. One out of three acute studies and eight out of nine chronic studies were on stented heart valve bioprosthesis. All analyses were conducted on the implantation of atrioventricular valves with trileaflet, except for one chronic study on unileaflet valves and one chronic and acute study on bileaflet valves. CONCLUSION: Understanding the variance in past pre-clinical study designs may increase the appropriate utilization of large animal models. This synthesized evidence provides a pre-clinical in vivo studies framework for future research on an atrioventricular bioprosthesis.

Development of a Standardized Assessment of Simulation-based Extracorporeal Membrane Oxygenation Educational Courses.

Background: In 2020, the Extracorporeal Life Support Organization education task force identified seven extracorporeal membrane oxygenation (ECMO) educational domains that would benefit from international collaborative efforts. These included research efforts to delineate the impact and outcomes of ECMO courses. Objective: Development of a standardized online assessment tool to evaluate the effectiveness of didactic and simulation-based ECMO courses on participants' confidence, knowledge, and simulation-based skills; participant satisfaction; and course educational benefits. Methods: We performed a prospective multicenter observational study of five different U.S. academic institution-based adult ECMO courses that met Extracorporeal Life Support Organization endorsement requirements for course structure, educational content, and objectives. Standardized online forms were developed and administered before and after courses, assessing demographics, self-assessment regarding ECMO management, and knowledge examination (15 simple-recall multiple-choice questions). Psychomotor skill assessment was performed during the course (time to complete prespecified critical actions during simulation scenarios). Self-assessment evaluated cognitive, behavioral, and technical aspects of ECMO; course satisfaction; and educational benefits. Results: Out of 211 participants, 107 completed both pre- and postcourse self-assessment forms (97 completed both pre- and postcourse knowledge forms). Fifty-three percent of respondents were physician intensivists, with most (51%) practicing at academic hospitals and with less than 1 year of ECMO experience (50%). After the course, participants reported significant increases in confidence across all domains (cognitive, technical, and behavioral, P < 0.0001, 95% confidence interval [CI], 1.2-1.5; P < 0.0001, 95% CI, 2.2-2.6; and P = 0.002, 95% CI, 1.7-2.1, respectively) with an increase in knowledge scores (P < 0.001; 95% CI, 1.4-2.5). These findings were most significant in participants with less ECMO experience. There were also significant reductions in times to critical actions in three of the four scored simulation scenarios. The results demonstrated participants' satisfaction with most course aspects, with more than 95% expressing that courses met their educational goals. Conclusion: We developed and tested a structured ECMO course assessment tool, demonstrating participants' self-reported benefit as well as improvement in psychomotor skill acquisition, course satisfaction, and educational benefits. Course evaluation is feasible and potentially provides important information to improve ECMO courses. Future steps could include national implementation, addition of questions targeting clinical decision making to further assess knowledge gain, and multilanguage translation for implementation in international courses.

Multidisciplinary Extubation Protocol in Cardiac Surgical Patients Reduces Ventilation Time and Length of Stay in the Intensive Care Unit.

BACKGROUND: Protocolized care bundles may improve patient care by reducing medical errors, minimizing practice variability, and reducing mortality. We hypothesized that the introduction of a multidisciplinary extubation protocol would reduce duration of mechanical ventilation and intensive care unit length of stay in a tertiary cardiothoracic intensive care unit. METHODS: A multidisciplinary extubation protocol was created. The protocol was applied to all elective postoperative cardiac surgery patients. Data were collected 3 months before and 3 months after protocol initiation. Patients were excluded if they experienced events that contraindicated application of the protocol. RESULTS: Two hundred one patients undergoing elective open cardiac surgery were included: 99 patients before protocol implementation (preprotocol) and 102 patients after implementation (postprotocol). Median extubation time was reduced by 35% (620 minutes versus 405 minutes; p < 0.001), whereas adjusted extubation time remained significantly reduced by 144 minutes (p < 0.001). Intensive care unit length of stay was reduced from 2 days preprotocol to 1 day postprotocol (p < 0.001). Reintubation rate was the same in both groups (2.06% versus 1.96%; p = 1.0). CONCLUSIONS: A simple multidisciplinary extubation protocol is safe and associated with a significant reduction in the duration of mechanical ventilation and intensive care unit length of stay after elective cardiac surgery.

Delayed presentation of ACE inhibitor-induced angio-oedema.

We report two probable cases of delayed presentation of ACE inhibitor (ACEi)-induced angio-oedema. The first patient was on ACEi for more than 10 years while the second one was on it for 7 years. Both the patients presented with initial unilateral swelling of the tongue which progressed further to involve the soft tissues of the oropharynx, head and neck leading to a compromised airway needing awake fibreoptic intubation and were managed successfully in the intensive care unit (ICU). C1 esterase inhibitor and mast cell tryptase level was normal for both patients. Both were treated with intravenous antihistamines and corticosteroids in the ICU. Both patients were successfully extubated within 72 h and transferred to a medical ward. Age above 65 years, atopy and non-steroidal anti-inflammatory drug use may have been the predisposing factors. Both patients made a full recovery with no complications and the ACEi was ceased.