Results 251 to 260 of about 8,736,512 (307)
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Journal of Applied Physiology, 1982
It was hypothesized that the chronotropic response to intrathoracic pressure changes generated by cough may provide a reliable and rapid index of the cardioacceleratory capacity, a complex reflex response important for survival. In 27 adults in the supine position we measured the heart rate response following three forceful coughs performed over a 3-s
J Y, Wei, W S, Harris
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It was hypothesized that the chronotropic response to intrathoracic pressure changes generated by cough may provide a reliable and rapid index of the cardioacceleratory capacity, a complex reflex response important for survival. In 27 adults in the supine position we measured the heart rate response following three forceful coughs performed over a 3-s
J Y, Wei, W S, Harris
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Rate-Responsive Cardiac Pacemakers
AACN Advanced Critical Care, 1991Pacemaker technology continues to advance in the direction of restoring a normal hemodynamic response under varying physiologic conditions. Rate-responsive pacemakers meet this challenge by adjusting the pacing rate in response to a sensed physiologic variable other than sinus node activity.
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Rate Responsive Dual Chamber Pacing
Pacing and Clinical Electrophysiology, 1986We report about a new pacemaker, which simultaneously offers dual chamber pacing in DDD Mode and activity controlled rate response. The system also uses activity‐sensing to differentiate true sinus tachycardia from ectopic atrial activity or atrial fibrillation and therefore prevents pacemaker mediated arrhythmias.
L J, Kappenberger, L, Herpers
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Concepts of rate responsive pacing
IEEE Engineering in Medicine and Biology Magazine, 1990Various concepts for measuring (by means of biosensors incorporated into pacemakers) biologic parameters to determine the appropriate pacing rate are reviewed. They are pH, stimulus-to-T-wave interval, blood temperature, intercardiac blood pressure change, venous oxygen saturation, intercardiac impedance (stroke volume, ejection rate, preejection ...
H J, Smith +2 more
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Physiologic Benefits of Rate Responsiveness
Pacing and Clinical Electrophysiology, 1983Ľaugmenfation du besoin métabolique ou cours de ľexercice est fournie par une hausse du débit cardiaque et de ľapport ?oxygène. Les malades porleurs ?un stimuluteur à fréquence fixe ne peuvent pas augmenter la fréquence cardiaque dont dépend ľaugmentation du débil systolique.
J E, Shapland +3 more
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Physiology of Rate-Responsive Pacing
Cardiology Clinics, 1992The search for a pacemaker that accurately and easily mimics normal physiology is a continuing effort. There have been many achievements in the past, including sensing of the pacing chamber and programming of the pacing rate, sensitivity, and output. Present pacing developments include atrioventricular synchrony and rate adaptiveness.
J D, Maloney +2 more
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2010
When conducting mail and mail-back surveys, market research firms need to estimate response rates in advance to be able to estimate the total expected reusable sample size resulting from a number of mailed questionnaires, and hence budget their study. We attempted to find an efficient and objective way of rating the response burden in order to assess ...
Axhausen, Kay W., Weis, Claude
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When conducting mail and mail-back surveys, market research firms need to estimate response rates in advance to be able to estimate the total expected reusable sample size resulting from a number of mailed questionnaires, and hence budget their study. We attempted to find an efficient and objective way of rating the response burden in order to assess ...
Axhausen, Kay W., Weis, Claude
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Operation-correlated heart-rate responses
Psychological Research, 1983Heart-rate responses were averaged before and after repeated operations on a keyboard related to clerical work. Decelerations were found in periods interpreted as being dominated by an internal focus of attention (e.g., decision-making, processing of internally stored information); acceleration could be attributed to an external focus of attention (as ...
W, Schönpflug, H, Mündelein
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Rate‐Responsive Pacing: Clinical Experience
Pacing and Clinical Electrophysiology, 1985Single chamber, rate‐responsive pacing is emerging as a new modality in cardiac pacing and in ihe near future, dual chamber rule‐responsive pacing may be the optimal solution for most pacemaker patients. In this report we describe our short‐ and long‐term clinical experience with two different rate‐responsive pacemakers: the RS4, an asynchronous atrial
A, Goicolea de Oro +5 more
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Response Rate and Conditioned Suppression
Psychological Reports, 1966Two experiments are reported in which a yoked-box design permitted variation of response rate while reinforcement frequency was controlled. In both studies, rats responding at high rates showed more conditioned suppression than their partners responding at lower rates.
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