Antipsychotics in routine treatment are minor contributors to QT prolongation compared to genetics and age.

The problem of QTc overcorrection due to Bazett’s formula becomes uncovered in patient samples receiving tachycardia inducing mediations: correction with Bazett’s formula yields a highly significant association between the QTcB interval and serum levels of clozapine ( n = 103, ß std = 0.169, p < 0.001), contrary to results using Fridericia’s formula ( n = 103, ß std = 0.003, p = 0.488).

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