Results 241 to 250 of about 84,426 (302)
Some of the next articles are maybe not open access.
International Journal of Cardiology, 2008
A juxtaposition of long and short RR intervals was observed in 2 hypertensive patients recovering from major surgery under spontaneous ventilation. Sinus rhythm was ascertained throughout the recording. These oscillations could not be linked one-to-one to ventilatory cycles.
Gratadour, P. +5 more
openaire +1 more source
A juxtaposition of long and short RR intervals was observed in 2 hypertensive patients recovering from major surgery under spontaneous ventilation. Sinus rhythm was ascertained throughout the recording. These oscillations could not be linked one-to-one to ventilatory cycles.
Gratadour, P. +5 more
openaire +1 more source
Nonrespiratory Sinus Arrhythmia
American Journal of Critical Care, 2005Scenario: This continuous lead II rhythm strip was obtained in a 25-year-old woman admitted to the intensive care unit for intracerebral hemorrhage. The patient presented to the emergency department with a headache after a skateboarding accident. The patient stated that she “bumped” her head during the accident.
Stephanie S, Deboor +2 more
openaire +2 more sources
Pediatrics, 1960
Though there are many comments on respiratory sinus arrhythmia in articles and textbooks, there have been surprisingly few data collected. We have presented data from 4,096 electrocardiograms of 199 healthy individuals on pulse rate, range (max. difference in cycle length), and frequency index (range/mean cycle lengthx100).
Richard Reeve, Kee DeBoer
openaire +1 more source
Though there are many comments on respiratory sinus arrhythmia in articles and textbooks, there have been surprisingly few data collected. We have presented data from 4,096 electrocardiograms of 199 healthy individuals on pulse rate, range (max. difference in cycle length), and frequency index (range/mean cycle lengthx100).
Richard Reeve, Kee DeBoer
openaire +1 more source
Sinus arrhythmia in rheumatic fever
American Heart Journal, 1961Abstract 1. 1. The degree (frequency index) of sinus arrhythmia was investigated in children suffering an initial attack of rheumatic fever (with and without carditis), in children with a recurrent attack, and in children with normal hearts who served as controls. 2. 2.
M C, JOSEPH, L, TENCKHOFF
openaire +2 more sources
A Minimal Model for the Respiratory Sinus Arrhythmia
Biological Cybernetics, 2006The cardiac and respiratory rhythms in humans are known to be coupled by several mechanisms. In particular, the first rhythm is deeply modulated by the second. In this report we propose a simple operational model for heart rate variability which, taking such modulation into account, reproduces the main features of some experimental sequences of RR ...
Barbi M +4 more
openaire +3 more sources
Arrhythmias and Sinus Node Dysfunction
JAMA: The Journal of the American Medical Association, 1984To the Editor. — Alpert and Flaker1have contributed an excellent review of arrhythmias associated with sinus node dysfunction. I wish to take exception to only one item, which, unfortunately, is a recurring source of confusion in many publications. In the author's Table 1, they list acute pericarditis as a cause of sinus node dysfunction.
openaire +2 more sources
Respiratory sinus arrhythmia in the human fetus
American Journal of Obstetrics and Gynecology, 1985This study explores the relationship between fetal heart rate variability and fetal breathing movements in the term fetus. Fourier analysis was applied to fetal heart rate variability during fetal breathing and nonbreathing episodes. A distinct component in the order of 0.7 to 0.95 Hz was demonstrated in fetal heart rate variability during breathing ...
M Y, Divon +5 more
openaire +2 more sources
Variation of respiratory sinus arrhythmia with age
Journal of Applied Physiology, 1976Respiratory sinus arrhythmia was measured on 24 male subjects whose agesranged from 21 to 65 yr, using a technique in which respiration was coupledto heart rate, so that there were 6 heartbeats per inspiration and 6 heartbeats per expiration. This voluntary cardiorespiratory coupling reduced the variance of heart rates measured at various points in ...
J B, Hellman, R W, Stacy
openaire +2 more sources
Model of respiratory sinus arrhythmia in man
Medical & Biological Engineering & Computing, 1989The first section of the model delineates the parasympathetic signal as a function of the interaction between the respiratory and the vagal neurones of the common brainstem network. The second section is a version of Chess and Calaresu's description of the vagus/heart period system in the sympathetically blocked cat.
R M, Negoescu, I E, Csiki
openaire +2 more sources
Individual differences in respiratory sinus arrhythmia
American Journal of Physiology-Heart and Circulatory Physiology, 2004To investigate the interindividual differences in respiratory sinus arrhythmia (RSA), recordings of ventilation and electrocardiogram were obtained from 12 healthy subjects for five imposed breathing periods ( TTOT) surrounding each individual's spontaneous breathing period.
Samia, Ben Lamine +5 more
openaire +2 more sources