抄録
An instance of markedly irregular sinus arrhythmia associated with acute diaphragmatic myocardial infarction has been described. It is quite unusual to observe an extreme sinus arrhythmia in an adult without the intervention of A-V nodal or ventricular escape rhythm.
The influence of digitalis, reserpine, guanethidine and morphine in relation to such cardiac arrhythmia has been discussed.
Sinus arrhythmia and/or sinus bradycardia are usually transient and require no treatment unless cardiac output is compromised. This arrhythmia may be mistaken for more serious arrhythmias such as A-V block, S-A block and sinus arrest because of marked irregularity with slowing of the heart rate.
