Effects of one-lung ventilation on cardiac autonomic nervous activity as evaluated by power spectral analysis of heart rate variability.
The purpose of this prospective study was to evaluate the effects of one-lung ventilation on the activity of the cardiac autonomic nervous system. Ten adult patients who underwent thoracotomy were endotracheally intubated with a double-lumen tube under general anesthesia using isoflurane. After induction of anesthesia, a continuous, 256-sec electrocardiogram (ECG) was obtained during bilateral lung ventilation (control) followed by recordings during one-lung ventilation of each side. Using the R-R interval tachograms obtained for the 256-sec ECGs, low frequency (LF: 0.04-0.15 Hz) and high frequency (HF: 0.15-0.40 Hz) bands of the spectral density of the heart rate variability and the HF/LF ratio were analyzed using the fast Fourier transform algorithm. Log(HF), which indicates parasympathetic activity, increased during one-lung ventilation on each side, but did not differ between ventilated sides. Log(LF), which represents sympathetic and parasympathetic activity, increased similarly to log(HF) on both sides. Log(HF/LF), the balance of the sympathetic and parasympathetic activity, did not change during one-lung ventilation. We suggest that one-lung ventilation alone does not substantially affect the cardiac autonomic nervous system.
Sato
N
N
Department of Anesthesiology, Hiroshima General Hospital, Hiroshima, Japan.
Kawamoto
M
M
Yuge
O
O
Sanuki
M
M
Matsumoto
C
C
Inoue
K
K
D000328:Adult; D000368:Aged; D000768:Anesthesia, General; D001341:Autonomic Nervous System / Q000502:physiology*; D004562:Electrocardiography; D016629:Esophagectomy; D005260:Female; D005583:Fourier Analysis; D006321:Heart / Q000294:innervation*; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D011013:Pneumonectomy; D011446:Prospective Studies; D012121:Respiration, Artificial / Q000379:methods*; D012815:Signal Processing, Computer-Assisted