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Cutaneous and subcutaneous blood flow during general anaesthesia
J L Saumet1, G Leftheriotis, J Dubost
1Laboratoire de Thermorégulation et de Metabolisme Energetique, C.N.R.S. UA 181, Université Claude Bernard, Lyon, France.
Summary
General anesthesia primarily impacts cutaneous blood flow, not subcutaneous blood flow, in humans. This study investigated anesthesia effects on superficial and deep blood flow using heat thermal clearance.
Area of Science:
- Anesthesiology
- Physiology
- Vascular Biology
Background:
- The impact of anesthetic agents on cutaneous blood flow is well-documented.
- However, the effects of anesthesia on subcutaneous blood flow, crucial for metabolism and thermoregulation, remain less understood.
Purpose of the Study:
- To quantify changes in cutaneous and subcutaneous blood flow during general anesthesia in human subjects.
- To compare these changes with physiological parameters like blood pressure and heart rate.
Main Methods:
- Fifteen patients undergoing facial plastic surgery received general anesthesia induced with flunitrazepam.
- Blood flow was measured using heat thermal clearance (HC) with superficial and deep sensors.
- Physiological parameters including arterial blood pressure, heart rate, and temperatures were monitored.
Main Results:
- Heart rate significantly increased post-anesthesia induction, while blood pressure remained stable.
- The rectal-toe temperature gradient decreased, indicating reduced vasomotor tone.
- Superficial heat thermal clearance (cutaneous blood flow) increased significantly, whereas deep heat thermal clearance (subcutaneous blood flow) showed no significant change.
Conclusions:
- General anesthesia primarily affects cutaneous blood flow.
- Subcutaneous blood flow remains largely unchanged during the early stages of anesthesia in humans.
- Findings suggest anesthesia's vasodilatory effects are more pronounced on superficial cutaneous vessels.