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Acute effects of ECT on cardiovascular functioning: relations to patient and treatment variables
Insights
Electroconvulsive therapy (ECT) for major depressive disorder showed no cumulative heart rate or blood pressure changes. Pre-treatment heart rate predicted postictal changes, with higher rates indicating smaller increases.
Area of Science:
- Neurology
- Psychiatry
- Cardiology
Background:
- Electroconvulsive therapy (ECT) is a treatment for severe depression.
- Understanding the cardiovascular effects of ECT, specifically heart rate (HR) and blood pressure (BP), is crucial for patient safety.
- Previous studies have suggested cumulative effects of ECT on cardiovascular parameters.
Purpose of the Study:
- To investigate the effects of ECT on heart rate and blood pressure in patients with major depressive disorder.
- To determine if ECT modality, anesthetic agent, or prior stimulation affects cardiovascular responses.
- To identify predictors of cardiovascular changes during ECT.
Main Methods:
- 34 patients with major depressive disorder received either bilateral or right unilateral ECT.
- Heart rate and blood pressure were monitored before and after seizure induction at each treatment session.
- Data were analyzed to assess the impact of ECT parameters and patient characteristics on cardiovascular changes.
Main Results:
- No cumulative pattern of heart rate or blood pressure changes was observed with repeated ECT treatments.
- ECT modality, anesthetic agent, and subconvulsive stimulation did not significantly affect peak postictal increases in HR or BP.
- Pre-treatment heart rate, but not blood pressure, strongly predicted the magnitude of peak postictal HR and BP increases; higher pre-treatment HR correlated with smaller increases.
Conclusions:
- Low-dosage, titrated ECT exhibits cardiovascular effects comparable to traditional high-dose techniques.
- Pre-treatment heart rate is a significant predictor of postictal cardiovascular responses to ECT.
- These findings contribute to a better understanding of ECT's physiological impact and inform patient management.
Abstract:
In 34 patients with primary, major depressive disorder, randomly assigned to bilateral or right unilateral ECT, heart rate (HR) and blood pressure (BP) were assessed prior and following seizure induction at every treatment. In contrast to prior reports, no cumulative pattern was observed in HR or BP changes as a function of treatment number. Generally, treatment variables, including ECT modality (bilateral vs. unilateral), anesthetic agent (methohexital vs. pentothal), and prior subconvulsive stimulation in a session, had no effects on the magnitude of peak postictal increases in HR or BP. The peak changes were also unrelated to the history of cardiac illness, remission of depressive symptomatology, patient seizure threshold and patient seizure duration. Pre-treatment HR was strongly predictive of peak postictal change in both HR and BP, while pretreatment BP was not. Patients with high pre-ECT HR had smaller peak postictal HR and BP increases. The findings suggested that low dosage, titrated ECT has HR and BP effects similar to traditional high dosage techniques, and that pre-treatment HR is the best predictor of these effects.