Key result
Spinal anesthesia significantly decreased both low-frequency and high-frequency components (0.03-0.5 Hz) of heart rate variability, with power spectra almost abolished at T1-2 sensory block levels.
Why the study?
Does spinal anesthesia alter sympathovagal balance as measured by heart rate variability in patients undergoing abdominal surgery?
Population
Patients receiving subarachnoid block for abdominal surgery
Design
Cohort
Follow-up
During spinal anesthesia
Authors
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Spinal anesthesia may profoundly suppress cardiac autonomic activity in abdominal surgery; hypothesis-generating for HRV monitoring but should not yet change practice.
Observational
Does spinal anesthesia alter sympathovagal balance as measured by heart rate variability in patients undergoing abdominal surgery?
Autoregressive power spectral analysis of HRV provides a quantitative measure of diminished sympathetic and parasympathetic activity to the heart during spinal anesthesia.
Introna et al. (1995) conducted an observational in Patients receiving subarachnoid block for abdominal surgery. Spinal anesthesia (subarachnoid block) was evaluated on Heart rate variability (low-frequency and high-frequency components). Spinal anesthesia significantly decreased both low-frequency and high-frequency components (0.03-0.5 Hz) of heart rate variability, with power spectra almost abolished at T1-2 sensory block levels.
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