I have used the term "Latent Heart Block" to indicate a prolonged P-R interval without any manifest degree of block, such as dropped beats or 2 :1 block. This paper is a clinical study of a series of such cases, mainly from the point of view of the xtiology and significance of the condition. One might guess that latent heart block would be found in the same cases as, but at an earlier stage tha...

Although congenital complete heart block is well recognized and has been fully reviewed, congenital partial heart block appears to be much more unusual. Howevev, a survey shows that several such cases have been described in America, but we have found only four cases recorded from this country. Whipham (1915) reported two, and Fleming and Stevenson (1928) gave an account of an eight-year-old gir...

In a series of over 6000 patients referred for fetal echocardiography during an eight year period, 37 fetuses were found to have complete heart block. There were 16 cases of isolated heart block and 21 cases associated with structural heart disease. All mothers of fetuses with isolated complete heart block had evidence of circulating syndrome Sjögren A antibody (Ro). Only one mother had clinica...

A case of florid rheumatoid heart disease with complete heart block is described, and the histopathology of the atrioventricular conducting tissue is described in detail.

Critical observation of the onset and course of transient bundle-branch block after acute myocardial ischaemia in 5 patients showed that the block was initially demonstrated both on increasing heart rate (tachycardia-dependent block) and on slowing (bradycardia-dependent block), with normal intraventricular conduction at intermediate heart rates. In some patients normal conduction disappeared w...

Congestive heart failure in complete heart block may be promptly relieved by pacing, particularly in the elderly patient with heart block due to isolated disease of the conducting system, as the working myocardium is generally normal and effective control of the heart rate will promptly relieve dyspnoea and oedema, restoring the patient to normal activities by control of the heart rate alone. A...