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Stroke Volume Variability Cardiovascular Response to Orthostatic Maneuver in Patients with Coronary Artery Diseases
Author(s) -
SIEBERT JANUSZ,
WTOREK JERZY,
ROGOWSKI JAN
Publication year - 1999
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.1999.tb09466.x
Subject(s) - supine position , medicine , cardiology , stroke volume , stroke (engine) , orthostatic vital signs , heart rate , heart rate variability , artery , blood pressure , mechanical engineering , engineering
A bstract : The dynamics of cardiovascular responses to postural stress have not been fully recognized. To determine whether coronary artery bypass grafting (CABG) has any effect on stroke volume variability (SVV), the power spectrum components of SVV were measured in 60 patients before and at 6 weeks after CABG. Stroke volume was assessed by means of the thoracic bioimpedance method. The thoracic impedance cardiogram and ECG were recorded in the supine and standing positions with controlled breathing rate (0.25 Hz) during 10‐minute periods. The analysis of SVV was done by means of the autoregressive method. The total power, the power in the low‐frequency band LFSV (0.05‐0.15 Hz), the power in the high‐frequency band HFSV (0.15‐0.5 Hz), and the LFSV/HFSV ratio were analyzed. Before CABG, we did not notice any significant changes in the stroke volume spectral power indices. After CABG, all spectral indices were significantly decreased in the standing position.