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Rate-pressure product and arterial oxygen saturation during electroconvulsive therapy
R H Gunawardana1, B Damayanthi
1University of Peradeniya.
The Ceylon Medical Journal
|September 1, 1991
Summary
Electroconvulsive therapy (ECT) under general anesthesia often causes hypoxemia and significant increases in heart rate and blood pressure. This suggests an oxygen supply-demand imbalance in the heart during ECT seizures.
Area of Science:
- Anesthesiology
- Cardiology
- Neurology
Background:
- Electroconvulsive therapy (ECT) is a medical procedure that involves inducing seizures under anesthesia.
- General anesthesia with thiopental and suxamethonium is commonly used during ECT.
Purpose of the Study:
- To investigate the physiological effects of ECT on arterial oxygen saturation, heart rate, and blood pressure.
- To assess the incidence of hypoxemia during ECT seizures.
Main Methods:
- Measurements of arterial oxygen saturation, heart rate, and systolic blood pressure were taken in 100 patients undergoing ECT.
- Patients received anesthesia with thiopental and suxamethonium.
- Ventilation with oxygen was administered during the procedure.
Main Results:
- 80% of patients experienced significant hypoxemia during the ECT-induced convulsion.
- A highly significant increase in heart rate and blood pressure (p < 0.001) was observed.
- These changes indicate a potential imbalance between myocardial oxygen supply and demand.
Conclusions:
- ECT under general anesthesia is associated with significant hypoxemia and cardiovascular stress.
- The findings suggest a critical imbalance in myocardial oxygenation during ECT seizures.
- Further research into managing these physiological changes during ECT is warranted.