which has 4 P waves and 3 QRS complexes per cycle may be referred to as 4:3 Mobitz Type I block.^:179

Type II Mobitz block also usually occurs with a fixed P:QRS ratio, with a set number of P waves for every successfully elicited QRS.^:179 This ratio is also frequently specified in referring to 3:1, 4:1, 5:1, or higher Mobitz type II block. Higher numbers of P waves for every QRS indicate more severe block^:181 and ratios of 3:1 and above are also referred to as "High Grade" AV Block^e60. Of course,