Prospective randomized study comparing outcome of myocardial protection with Del-Nido Cardioplegia versus Saint Thomas Cardioplegia in adult cardiac surgical patients

Objectives: To compare the effectiveness of Del-Nido cardioplegia as myocardial protective agent with Saint Thomas cardioplegia in adult cardiac surgical patients. Methods: This prospective randomized study was conducted in cardiac surgery department of Bahawal Victoria hospital Bahawalpur, from October 2020 to March 2021. Eighty adult patients who underwent primary Isolated coronary artery bypass grafting (CABG) or isolated Valve surgery requiring cardiopulmonary bypass were randomly divided into Del Nido (DN, n=40) and Saint Thomas (ST, n=40) groups. Data regarding operative and post-operative variables such as cardiopulmonary bypass (CPB) and aortic cross clamp (AXC) times, inotropic requirements, resumption of sinus rhythm, need for electrical defibrillation, post-operative CKMB, blood requirement and ICU stay were noted. Results: CPB and AXC times were statistically insignificantly different. Resumption of Sinus rhythm was seen significantly in more patients of DN group (95%) than in ST group (72.5%) [p-value 0.05]. Less patients of DN group (5%) were candidates of electrical defibrillation than ST group (17.5%) [p-value <0.001). Post- operative CKMB values were significantly lower in DN group as compared to ST group (30.5±22.6 IU vs 50.5±50.28 IU, p value.008). Blood transfusion was significantly lower in DN group; 50% versus 80% in ST group (p-value 0.005). Ventilation time was significantly less in DN group than ST group (165.95±48.09 minutes versus 165.95±48.09 minutes respectively, p-value 0.03). While ICU stay was also less in DN group; 5.2±0.8 days versus 6.05±1.6 days in ST group (p-value 0.003). Conclusion: Del-Nido cardioplegia is a reliable and better myocardial protective agent than Saint Thomas cardioplegia in adult cardiac surgical procedures. doi: https://doi.org/10.12669/pjms.38.3.4730 How to cite this:Rizvi MFA, Yousuf SMA, Younas A, Baig MAR. Prospective randomized study comparing outcome of myocardial protection with Del-Nido Cardioplegia versus Saint Thomas Cardioplegia in adult cardiac surgical patients. Pak J Med Sci. 2022;38(3):---------. doi: https://doi.org/10.12669/pjms.38.3.4730 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Сardiopulmonary and cerebral resuscitation: new European Resuscitation Council Guidelines for resuscitation 2021

The article presents the current changes in the algorithm of cardiopulmonary and cerebral resuscitation (CPCR), adopted by the European Council for Resuscitation in 2021. The article presents the principles of basic life support and advanced life support, inclu-ding taking into account the European recommendations published in 2020, dedicated to the specifics of CPCR in the context of the COVID-19 pandemic. The main focus of CPCR in the COVID-19 pandemic is that the safety of healthcare workers should never be compromised, based on the premise that the time it takes to ensure that care is delivered safely to rescuers is acceptable part of the CPCR process. The principles of electrical defibrillation, including in patients with coronavirus disease who are in the prone position, pharmacological support of CPCR, modern monitoring capabilities for assessing the quality of resuscitation measures and identifying potentially reversible causes of cardiac arrest, the use of extracorporeal life support techno-logies during CPR are highlighted. The modern principles of intensive care of the post-resuscitation syndrome are presented, which makes it possible to provide improved outcomes in patients after cardiac arrest.

Abstract 334: Cardioplegia Defibrillation of Circulatory Phase Ventricular Fibrillation in a Swine Model: Three Randomized Controlled Trials

Introduction: We previously found potassium cardioplegia followed by rapid calcium reversal (K plegia) can achieve defibrillation in a swine model of electrical phase ventricular fibrillation (VF) comparable to standard care. Hypothesis: Exploring 3 possible potassium (K) dose and timing protocols, we hypothesize K plegia may benefit resuscitation of circulatory phase VF. Methods: Three separate blinded randomized placebo-controlled trials were performed with electrically-induced VF untreated for durations of 6,9, and 12 minutes in a swine model. All experimental groups received infusion of 1 or 2 boluses of intravenous (IV) K followed by a single calcium reversal bolus. Only K was replaced by saline in the control groups. All other treatments were the same. Outcomes included: amplitude spectrum area (AMSA) during VF, resulting rhythms, number of defibrillations, return of spontaneous circulation (ROSC), and hemodynamics for 1 hour post ROSC. Single nominal and interval outcomes were compared with Fisher’s Exact test and Mann-Whitney U, respectively. Results: Twelve, 12, and 8 animals were included at 6, 9 , and 12 minute VF durations for a total of 32. ROSC, average number of shocks, and post-ROSC norepinephrine requirement are listed below. 4/6 K plegia and 2/6 control animals achieved ROSC in the 9 minute protocol, (p=0.24). Two of 8 animals that achieved ROSC with K plegia did so without electrical defibrillation. Conclusions: The majority of animals achieved ROSC after up to 9 minutes of untreated VF arrest using K plegia protocols. K plegia requires further optimization for both peripheral IV and intraosseous infusion, and to assess for superiority over standard care.

Valery Pavlovich RADUSHKEVICH - surgeon, teacher, doctor of medical Sciences, Professor ( to the 110th anniversary of the birth)

20 Jan 1908 in Irkutsk was born Valery Radushkevich. After graduating from the medical faculty of Siberian state medical Institute (1926-1931), he studied in clinical residency (1935-1936) and worked in the district hospital, assistant hospital surgical clinic of the Novosibirsk medical Institute (1937), Director of the Novosibirsk regional station of blood transfusion (since 1938). During the great Patriotic war Valery Pavlovich – leading surgeon of the Novosibirsk hospital No. 1504, chief surgeon of the Novosibirsk (1945-1947). In 1948, he defended his doctoral thesis on the surgical treatment of arteriovenous aneurysms. He worked as the Director of the Voronezh state medical Institute (1950-1954), the head of the Department of hospital surgery (1950-1974), chief doctor of the Voronezh regional clinical hospital (1959-1970). In 1967 V. P. Radushkevich awarded the honorary title of Honored scientist of the RSFSR. For 25 years Valery Pavlovich was the Chairman of the Voronezh regional scientific and practical society of surgeons. He was the author of over 200 scientific works, including monographs: "cardioversion of atrial fibrillation" (Voronezh, 1966), "Electrical defibrillation with atrial fibrillation and its importance in the surgery of mitral stenosis" (Voronezh, 1977), a member of the editorial Board of the journal "Surgery" and "Experimental surgery". Awarded the order of Lenin and Labor red banner, medals. Valery died 27 June 1976. The house in which he lived, a memorial plaque.

Impact of electrical defibrillation on infarct size and no-reflow in pigs subjected to myocardial ischemia-reperfusion without and with ischemic conditioning

Ventricular fibrillation (VF) occurs frequently during myocardial ischemia-reperfusion (I/R) and must then be terminated by electrical defibrillation. We have investigated the impact of VF/defibrillation on infarct size (IS) or area of no reflow (NR) without and with ischemic conditioning interventions. Anesthetized pigs were subjected to 60/180 min of coronary occlusion/reperfusion. VF, as identified from the ECG, was terminated by intrathoracic defibrillation. The area at risk (AAR), IS, and NR were determined by staining techniques (patent blue, triphenyltetrazolium chloride, and thioflavin-S). Four experimental protocols were analyzed: I/R ( n = 49), I/R with ischemic preconditioning (IPC; n = 22), I/R with ischemic postconditioning (POCO; n = 22), or I/R with remote IPC (RIPC; n = 34). The incidence of VF was not different between I/R (44%), IPC (45%), POCO (50%), and RIPC (33%). IS was reduced by IPC (23 ± 12% of AAR), POCO (31 ± 16%), and RIPC (22 ± 13%, all P < 0.05 vs. I/R: 41 ± 12%). NR was not different between protocols (I/R: 17 ± 15% of AAR, IPC: 15 ± 18%, POCO: 25 ± 16%, and RIPC: 18 ± 17%). In pigs with defibrillation, IS was 50% larger than in pigs without defibrillation but independent of the number of defibrillations. Analysis of covariance confirmed the established determinants of IS, i.e., AAR, residual blood flow during ischemia (RMBFi), and a conditioning protocol, and revealed VF/defibrillation as a novel covariate. VF/defibrillation in turn was associated with larger AAR and lower RMBFi. Lack of dose-response relation between IS and the number of defibrillations excluded direct electrical injury as the cause of increased IS. Obviously, AAR size and RMBFi account for both IS and the incidence of VF. IS and NR are mechanistically distinct phenomena. NEW & NOTEWORTHY Ventricular fibrillation/defibrillation is associated with increased infarct size. Electrical injury is unlikely the cause of such association, since there is no dose-response relation between infarct size and number of defibrillations. Ventricular fibrillation, in turn, is associated with a larger area at risk and lower residual blood flow.

P069: Prehospital amiodarone use could improve favorable neurological recovery among patients with out-of-hospital shockable cardiac arrest

Introduction: Amiodarone may be used for shock-refractory ventricular fibrillation (VF) or pulseless ventricular tachycardia (pVT), but the effect of prehospital use upon neurological outcomes still unclear. Methods: A prospective province-wide, population based observational study was conducted from January 2006 to March 2016. Adult emergency medical service-treated non-traumatic OHCA patients who received at least one electric defibrillation were included. Amiodarone was administered to patients with VF/ pVT by paramedics based on their clinical assessment, according to provincial guidelines. The outcome of interest was favorable neurological outcomes to hospital discharge, defined as modified Rankin scale of 3 or less. Multivariable logistic regression was performed to compare the proportion of patients with the primary outcome between amiodarone and non-amiodarone groups, further stratified by the number of electrical defibrillation. In addition, to mitigate the potential selection bias, the same logistic regression was conducted in 1:1 propensity score matched groups adjusting for baseline covariates. Results: Of 3,374 overall OHCA patients, 915 (27.1%) were managed with amiodarone. In the amiodarone group, 150 / 915 (16.4 %) patients had a favorable neurological outcome, compared to 455/2,459 (18.5%) in the non-amiodarone group (crude odds ratio [OR] 0.86, 95% CI 0.71 to 1.06). In the multiple logistic regression model, prehospital amiodarone was associated with increased probability of favorable neurological outcomes (adjusted OR 2.11, 95% CI 1.46 to 3.05). With stratification by the number of electrical defibrillation performed, amiodarone treated group showed higher probability of favorable neurological outcomes (1 or 2: adjusted OR 2.71, 95% CI 1.33 to 5.50, 3 and more: adjusted OR 1.67, 95% CI 0.99 to 2.39). Similarly, in 1:1 propensity matched cohort including 882 OHCA patients, the adjusted association persisted (adjusted OR 2.14, 95% CI 1.33 to 3.44). Conclusion: Prehospital administration of amiodarone to non-traumatic OHCA patients was associated with better neurological recovery, especially in those who received fewer electrical defibrillations.