Assessment of Cardiac Baroreflex Function During Fixed Atrioventricular Pacing Using Baroreceptor-Stroke Volume Reflex Sensitivity

Autor:	Tomiya Yasumasu, Yasushi Oginosawa, Yasuhide Nakashima, F.A.C.C. Haruhiko Abe M.D., Kazuo Takahara
Rok vydání:	2005
Předmět:	Male medicine.medical_specialty Baroreceptor Supine position Posture Hemodynamics Pressoreceptors Baroreflex Physiology (medical) Internal medicine Supine Position Humans Medicine Aged business.industry Respiration musculoskeletal neural and ocular physiology Cardiac Pacing Artificial Heart Stroke Volume Stroke volume Middle Aged Blood pressure nervous system Anesthesia Reflex bradycardia Atrioventricular Node cardiovascular system Cardiology Reflex Female Cardiology and Cardiovascular Medicine business circulatory and respiratory physiology
Zdroj:	Journal of Cardiovascular Electrophysiology. 16:727-731
ISSN:	1540-8167 1045-3873
DOI:	10.1111/j.1540-8167.2005.40767.x
Popis:	UNLABELLED Baroreflex sensitivity in paced patients. INTRODUCTION The baroreceptor-heart rate (HR) reflex has prognostic value in cardiovascular medicine. However, it cannot be used in chronotropically incompetent or paced patients. In healthy subjects, the baroreceptor-stroke volume (SV) reflex, with power spectral analysis of SV and blood pressure (BP) variations in the low-frequency band, serves as an alternate measure of the baroreceptor-cardiac reflex. This study examined the baroreceptor-stroke volume (SV) reflex sensitivity in the supine and 60 degrees upright positions in paced patients. METHODS AND RESULTS We studied 16 recipients of dual-chamber pacemakers paced at a fixed rate. The hemodynamics and baroreceptor-SV reflex sensitivity were measured during atrioventricular (AV) sequential pacing every 5 minute in the supine and 60 degrees upright positions. Mean SV decreased from 42.0+/-20.1 mL in the supine to 36.6+/-16.1 mL in the upright position (P
Databáze:	OpenAIRE
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