Nonrespiratory Sinus Arrhythmia

Abstract

We report here 2 cases of sinus arrhythmia considered to be a form of nonrespiratory sinus arrhythmia because they did not have variances in the RR interval sequence within the oscillations modulated by respiration. Because the patients had pulsus alternans similar that observed in bigeminy, and because they did not have signs or symptoms of heart failure, we believe the arrhythmias represent intrinsic alterations of the electric activity of the sinus node

‘Nonrespiratory sinus arrhythmia’ or ‘heart rate alternans’: Comments on the article by Gratadour et al. ‘Unusual sinus arrhythmia’

“…In Binkley's study power spectral density function analysis of RR interval series during sinus rhythm revealed an unusual power concentration above 0.5 Hz [6]. In 2002, we were able to report two cases of sustained otherwise normal sinus rhythm alternation in octogenarians with normal or mildly depressed left ventricular systolic function [7]. In our study, power spectral analysis of 64 s-RR interval sequences during sinus rhythm demonstrated an increased power concentration above 0.5 Hz, peaking exactly the frequency corresponding to half the average heart rate of respective RR interval sequence, not related to respiratory movements.…”

Electrocardiographic Passing Phenomenon (Flying Phenomenon or Yasser’s Phenomenon) Conveys the Traditional Cardiovascular Management; Interpretations and Reassurance; Retrospective Observational Study

“…The two differ in that nonrespiratory SA is not associated with the respiratory cycle. While it can occur within healthy individuals, more often this type correlates with an underlying pathology [61]. This type was reported with digitalis overdose and traumatic intracerebral hemorrhage that associated with vasospasm, hypoxia, and increased intracranial pressure [62].…”