ESTRO 2022 - Abstract Book

S891

Abstract book

ESTRO 2022

holding and the mean diaphragm excursion (peak – trough) for all inflations determined and analyzed with a Wilcoxon signed-rank test (Bonferroni adjusted α =0.05/4). Results The mean diaphragm excursion (8mm) at 60 brpm using the TwinStream ventilator showed a significantly larger median excursion (p=0.002) than when using any other ventilation frequency setting (Fig. 2). The smallest diaphragm excursions, with a mean of 1 mm, were found using the TwinStream ventilator at 250 and 400 brpm. At all ventilation frequencies except using the TwinStream ventilator at 60 brpm the mean inter-session variability was <1 mm.

Conclusion Motion of the right diaphragm dome during non-invasive high frequency ventilation was successfully quantified using ultrasound. High frequency ventilation without percussion is a promising breathing regularization strategy to reduce the diaphragm motion, especially using the TwinStream ventilator at 250 or 400 brpm.

PO-1057 Interim analysis of a prospective ventricular tachycardia radioablation safety trial (NCT04642963)

M. Miszczyk 1 , M. Sajdok 2 , T. Jadczyk 3,4 , R. Kurzelowski 3 , T. Latusek 5 , K. Go ł ba 2,6 , J. Bednarek 6,7 , Ł . Dolla 8 , A. Grz ą dziel 8 , K. Zub 2 , B. Tomasik 9,10 , M. Cybulska 2,6 , R. Gardas 6,2 , A. Drzewiecka 2 , W. Wojakowski 3 , K. Wita 11 , S. Blamek 5 1 Maria Sklodowska-Curie National Research Institute of Oncology, IIIrd Department of Radiotherapy and Chemotherapy, Gliwice, Poland; 2 Upper-Silesian Heart Center, Medical University of Silesia, Department of Electrocardiology, Katowice, Poland; 3 Medical University of Silesia, Department of Cardiology and Structural Heart Diseases, Katowice, Poland; 4 St. Anne’s University Hospital Brno, International Clinical Research Center, Interventional Cardiac Electrophysiology Group, Brno, Poland; 5 Maria Sklodowska-Curie National Research Institute of Oncology, Radiotherapy Department, Gliwice, Poland; 6 Medical University of Silesia, Department of Electrocardiology and Heart Failure, Katowice, Poland; 7 John Paul II Hospital, Department of Electrocardiology, Kraków, Poland; 8 Maria Sklodowska-Curie National Research Institute of Oncology, Radiotherapy Planning Department, Gliwice, Poland; 9 Maria Sklodowska-Curie National Research Institute of