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Changes in ventilatory pattern and arterial oxygen saturation during spinal anaesthesia in man
M Yamakage1, A Namiki, H Tsuchida
1Department of Anesthesiology, Sapporo Medical College, Japan.
Acta Anaesthesiologica Scandinavica
|August 1, 1992
Summary
Spinal anesthesia increases rib cage contribution to breathing in surgical patients. This change in respiratory pattern did not significantly affect overall arterial oxygen saturation levels.
Area of Science:
- Anesthesiology
- Respiratory Physiology
Background:
- Spinal anesthesia is a common regional anesthetic technique.
- Understanding its effects on respiratory mechanics is crucial for patient safety.
Purpose of the Study:
- To investigate the impact of spinal anesthesia on respiratory patterns.
- To assess changes in peripheral oxygen saturation (SpO2) during spinal anesthesia.
Main Methods:
- Utilized respiratory inductive plethysmography to measure rib cage contribution to tidal volume (%RC).
- Employed pulse oximetry to monitor finger SpO2 in 20 surgical patients.
- Compared measurements before and during spinal anesthesia.
Main Results:
- Significant increase in %RC from 20.4% to 30.4% during spinal anesthesia.
- Observed a return to baseline %RC (23.0%) in patients who fell asleep.
- Finger SpO2 increased significantly, while femoral arterial oxygen saturation remained unchanged.
Conclusions:
- Spinal anesthesia enhances rib cage contribution to tidal volume in conscious patients.
- This respiratory pattern alteration does not lead to significant changes in arterial oxygen saturation.