PMID: 18204183Mar 28, 2008Paper

Daily changes in cardiac and vascular blood pressure components during breath holding episodes in obstructive sleep apnea patients after day-shift and night-shift work

Journal of Physiology and Pharmacology : an Official Journal of the Polish Physiological Society
M Tafil-KlaweM Smietanowski

Abstract

We evaluated daily variability in the cardiovascular response to arterial chemoreceptors activation during breath holding in shift workers who were obstructive sleep apnea patients. Ten patients and 10 weight and age-matched control subjects were enrolled in the study. The experimental sessions consisted of 10 episodes of breath holding on inspiration interspersed with 1 min free breathing periods, repeated every 6 h: at 0.00, 6.00, 12.00, 18.00 hours. The subjects were examined under two experimental protocols: after day-shift work and after night-shift work (36 h of sleep deprivation). Blood pressure (System Portapres), ECG, and arterial hemoglobin oxygen saturation were monitored continuously. Data analysis were based on Smietanowski procedures written in the 4-th generation script language of MATLAB environment. The two methods introduced by Smietanowski a enabled symbolic description of cardiovascular regulatory mechanisms as cardiac, vascular, or mixed type control (BBC), and allowed quantifying relative contributions of cardiac and vascular components in the blood pressure variability. During the part of the study conducted after day-shift work, repetitive apneas led to a significantly greater increase in blood pressure ...Continue Reading

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