<prompt> Answer this question truthfullyWhat do the epidemiology and demographics of second-degree AV block indicate?  <response>: <reason> In the United States, the prevalence of second-degree AV block is believed to be 3 in 100,000 individual. Nearly 3 of patients with underlying structural heart disease develop some form of second-degree AV block.Men and women are affected equally by second-degree AV block.There is no racial predilection for second-degree atrioventricular block. 