Predictors of response to electroconvulsivetherapy
Keywords:
electroconvulsive therapy, efficacy, predictors of responseAbstract
Electroconvulsive therapy (ECT)is the oldest method still used in psychiatric treatments. Due to small amount of randomized clin-ical trials there is little agreement about precise efficacy (most often determined in the range of 50-80%) and clinically useful predictors of acute ECT outcomes in individual patients. Factors such as index episode duration equal or longer than one year, fewer failed antide-pressant treatments, previous successful ECT course, presence of suicidal thoughts, good response to initial therapy (first three treatments) and postictal suppression are considered as significantly predictive by most authors. Contrarily, medication resistance, chronic depression/dysthymia and personality disorders especially borderline personality disorder are regarded as predictors of nonremission. Data on such factors as: psychotic or hypochondriac features, concurrent antidepressant medication, and baseline severity are contradictory. The existing literature suggests that combination of ECT and antipsychotic treatment is a useful option for patients with medication-resistant schizophrenia or when rapid global improvement of clinical condition is desired. The tolerability of ECT is not influenced by concomitant neuroleptic medication. Variables such as age, gender, and comorbidity of somatic diseases do not affect the effectiveness of ECT, although the first two in combination with certain parameters of EEG are useful in adjusting the dose of electrical impulse, thereby improving the effectiveness of individual seizures. Isolating the biological variability among the neurophysiological and neuroimaging factors, that predisposes to positive or negative clinical response to ECT would allow optimization of individual treatments and thus improve the safety of therapy and reduce its costs.
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