Clinical electrocardiography . erlying disturbances of thecardiac mechanism are not arhythmia. In flutter we are concernedwith an ectopic tachycardia, and in complete auriculoventriculardissociation with a disturbance in impulse conduction, the arhythmiabeing purely a secondary phenomenon. This classification, I be-lieve, is not confusing; its basis reverts directly to the fundamentaldisturbances of the cardiac mechanism. 54 CARDIAC ARHYTHMIAS 55 SINUS ARHYTHMIASinus or respiratory arhythmia is frequently observed in healthyyoung persons. Mackenzie has termed it the youthful type ofirregularit
Clinical electrocardiography . erlying disturbances of thecardiac mechanism are not arhythmia. In flutter we are concernedwith an ectopic tachycardia, and in complete auriculoventriculardissociation with a disturbance in impulse conduction, the arhythmiabeing purely a secondary phenomenon. This classification, I be-lieve, is not confusing; its basis reverts directly to the fundamentaldisturbances of the cardiac mechanism. 54 CARDIAC ARHYTHMIAS 55 SINUS ARHYTHMIASinus or respiratory arhythmia is frequently observed in healthyyoung persons. Mackenzie has termed it the youthful type ofirregularity. A slight acceleration of rate occurs during inspira- H-v Fig. 20.—Schematic graph of sinus arhythmia: A, Auricle; A-V, auriculo-ventricular junctional tissues; V, ventricle. These abbreviations are employedin the subsequent graphs. tion and a slight slowing during expiration. The direct cause ofthe arhythmia is vagus stimulation resulting from respiratoryaction which affects the sino-auricular node, and causes a transient.
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