Total Electrical Alternation in Pericardial Disease

Total electrical alternation in pericardial disease.

Pericardial disease.

In contrast to coronary artery disease, heart failure, valvular disease, and other topics in the field of cardiology, there are few data from randomized trials to guide physicians in the management of pericardial diseases. Although there are no American Heart Association/American College of Cardiology guidelines on this topic, the European Society of Cardiology has recently published useful gui...

Echocardiography in Pericardial Disease

Electrical alternation of T wave without change in QRS complex.

Electrical alternation of the heart usually involves the QRS complex with or without alternans of the ST segments and the T wave (Kleinfeld, Stein, and Kossmann, I963). Alternating differences limited to the latter have been observed in animal preparations (Lepeschkin, I950; Kleinfeld and Gross, I956; Doherty and Hara, I96I), but are exceptional in clinical electrocardiography (Doherty and Hara...

Hippocampal electrical activity in the monkey during delayed alternation problems.

.... 1 I .. , A well known effect of lesions of frontal granular cortex and of all limbic structures including the hippocampus is the impairment of the classical delayed spatial alternation problem (Pribram et at. 1952. 1962, 1966; Mishkin and Pribram 1955; Mishkin 1964; McEnaney and Butter 1969). Not every alternation performance, however. shows a decrement from frontal cortex or medial forebr...