OBSERVATIONS ON SINO-AURICULAR HEART BLOCK

Three Cases of Sino-Auricular Block

physiological condition in which there is rhythmical variation in the heart-rate due to vagal influences at the pace-maker. The variation may be dependent on the respiration, the rate waxing with inspiration, waning with expiration, or it may be unrelated to breathing. The condition is well marked in children and athletes of great stamina. It is common in the latter to find a pulse-rate of 44 t...

Sino-auricular block associated with intrathoracic new growths.

Nerve Fibrils in the Sino-auricular Node

Aside from the nerve fibers which enter the pace-making node from the subepicardium, there were observed within the limits of the node a few ganglionic cells and a plexus of moniliform nerve fibrils in very close relation to its muscle fibers, hence the sino-auricular node, like the auriculo-ventricular, may be considered from a histological standpoint a neuromuscular organ.

Sino-auricular block, interference dissociation, and different recovery rates of excitation in the bundle branches.

Disturbances in the propagation of the heart beat between the auricle and the two ventricles are of frequent occurrence and well known under the terms A-V dissociation or heart block. The term sinoauricular block is the standard name for an apparent block between the sinus node and the auricle, a hypothetical incident to explain transient auricular standstill for a period of time that is a mult...

Fine structure and organization of the sarcoplasmic reticulum in the sino-auricular fibres of frog heart.

The ultrastructure of the sarcoplasmic reticulum (SR) of the sino-auricular fibres of frog heart has been investigated especially in order to evaluate its possible relationship with several cellular organelles. The SR appears as a complex unit which can be divided into three regions:--peripheral SR, localized beneath the sarcolemma. It is composed of junctional SR, which forms specialized compl...