Abstract 13688: Shocking: Cardioversion in Cardiogenic Shock Has Limited Success
Introduction: Atrial fibrillation (AF) and atrial flutter (Aflutter) are common in cardiogenic shock patients in the Cardiac ICU (CICU). Electrical cardioversion (CV) can restore sinus rhythm, but carries the risk of transient hemodynamic deterioration. There has been little research in the efficacy and safety of electrical CV for AF/Aflutter in the CICU. Objective: Describe success of CV in AF/Aflutter in cardiogenic shock patients in the CICU. Methods: We identified Maine Medical Center CICU patients from 1/1/2015 to 12/31/19 who were in cardiogenic shock and underwent electrical CV for AF/Aflutter. Cardiogenic shock was defined by depressed cardiac index (<2.2L/m^2 or inotrope use), hypotension (systolic BP <90 mmHg, MAP <65 mmHg, or vasopressor use), and Lactate > 2mmol/L. If a patient had multiple CVs, only the first was analyzed. Results: Twenty patients met the inclusion criteria. Initially, 16 of 20 CVs were successful, however only 10 patients were in SR 24 hours after CV and only 7 were in SR at CICU discharge (Figure 1). The median LVEF was 20%, similar between groups (p-value = 0.52 initially, 0.37 at 24 hours, and 0.18 at CICU discharge). Only 1 patient was on mechanical support. The type of AF was varied (35% newly diagnosed, 55% paroxysmal, and 10% persistent). In patients with new AF, 85% were in SR initially, 57% at 24 hours, and 28% at CICU discharge. All patients received amiodarone. Inotrope use was similar, however no patients on vasopressors were in SR at CICU discharge (5/13 vs 0/7, p=0.11). Only 1 patient suffered an adverse effect (sinus bradycardia). Diabetes (p = 0.064) was the only characteristic to nearly predict lack of CV success at CICU discharge. Conclusions: 1. Electrical CV in patients admitted to the CICU in cardiogenic shock had a high initial success rate, however success was short-lived. 2. CV did not cause serious adverse effects. 3. Larger registries/trials are needed to predict which subgroups of CICU patients benefit from CV for Afib/Aflutter.