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Atrial fibrillation (AF) is one of the most frequently occurring arrhythmias globally. Risk factors such as aging, hypertension, cardiac and pulmonary diseases, alcohol consumption, smoking, obesity and obstructive sleep apnea play an important role in the development of AF.(1-2) AF is a leading cause of ischemic stroke worldwide and is associated with increased mortality. (3) AF management depends on four pillars: risk factor management, anticoagulation depending on the CHA2DS2-VASc score, rate control and rhythm control. (4) The application of thermal energy in ablation, such as in cryoablation, can cause rare complications such as an esophageal injury, esophageal perforation and atrial-esophageal fistula. (5,6). Numerous technologies have been developed to avoid this problem and include esophageal temperature surveillance, using reduced

Atrial fibrillation (AF) is the most common sustained arrhythmia and is a significant public health burden. 1,2 Many mutations in ion-channel and non ion-channel structural genes are linked to AF especially in patients with family history and no risk factors. 3 The pulmonary vein muscle sleeves are the main trigger for AF. 4 Many studies showed that pulmonary vein isolation (PVI) via catheter ablation is superior to medical therapy in decreasing all-cause mortality, hospitalizations and recurrence [5][6][7] . Though it is still controversial, vagal denervation and targeting the major atrial ganglionated plexi (GP) have been reported by Pappone et al. to improve the outcome after PVI. 8 GP ablation has been associated with QT prolongation and ventricular arrhythmias 9 . PVI affects the atrial GP, modifies the intrinsic cardiac autonomic nervous system and could lead to QT prolongation and lethal ventricular arrhythmias such as torsade de pointe and ventricular tachycardia. 10

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Introduction: In-hospital cardiac arrest(IHCA) constitutes a significant cause of morbidity and mortality. we devised this study to shed some light on it to better inform both hospitals and policymakers. Methods: We analyzed retrospective data from 680 IHCAs at the American University of Beirut Medical Center between July 1st, 2016, and May 2nd, 2019. Sociodemographic variables included age, sex, and comorbidities in the Charlson Comorbidity Index(CCI). IHCA variables were the day of the