RT Book, Section A1 Huis in ‘t Veld, Maite A. A1 Mattu, Amal A1 Thurman, R. Jason A2 Knoop, Kevin J. A2 Stack, Lawrence B. A2 Storrow, Alan B. A2 Thurman, R. Jason SR Print(0) ID 1181052353 T1 Type 1 Second-Degree AV Block (Mobitz I, Wenckebach) T2 The Atlas of Emergency Medicine, 5e YR 2021 FD 2021 PB McGraw-Hill PP New York, NY SN 9781260134940 LK accessmedicine.mhmedical.com/content.aspx?aid=1181052353 RD 2024/04/19 AB Progressive PR-interval prolongation throughout the cardiac cycle until a P wave occurs without a QRS complex (“dropped” beat).After the dropped QRS complex, the cycle continues again with the PR interval of the 1st beat in the cycle always shorter than the PR interval of the last beat in the previous cycle.P wave may be hidden by the preceding T wave.