A review of the ECG characteristics of "fixed ratio blocks", i.e. second degree AV block with 2:1 or 3:1 conduction ratios.
Second degree heart block (2nd degree AV block) with a P:QRS ratio of 3:1 or higher, producing an extremely slow ventricular rate.
A review of the ECG features of Mobitz II 2nd degree AV block - Originally termed Hay block (1906) by Mobitz in 1924. ECG Library LITFL
Eponymythology of Second-degree Atrioventricular (AV) block including Luciani, Galabin, Wenckebach, Hay and Mobitz
57 year old female presents following a collapse at work. Describe and interpret this ECG. LITFL Top 100 ECG