Prolonged QT interval in acute psychotic patients

Area of Science:

• Cardiology
• Psychiatry
• Clinical Medicine

Background:

• Hypokalemia, a common finding in acute psychotic patients during emergency admission, is a known cause of prolonged QT interval.
• This association suggests a potential cardiac risk in this patient population.

Purpose of the Study:

• To investigate the hypothesis that acute psychotic patients exhibit a prolonged corrected QT (QTc) interval.
• To evaluate the prevalence and potential causes of prolonged QTc interval in drug-free, acute psychotic patients upon emergency admission.

Main Methods:

• Sixty-seven drug-free, acute psychotic patients were assessed for their corrected QT (QTc) interval.
• Demographic and clinical characteristics were recorded at the time of emergency admission.
• QTc intervals were compared between psychiatric emergency patients and psychiatric outpatients.

Main Results:

• The mean QTc interval was significantly prolonged in psychiatric emergency patients compared to psychiatric outpatients (t=5.20, P<0.0001).
• Factors such as age, gender, circadian rhythm, medication, comorbidities, obesity, and other serum electrolytes did not appear to be major contributors.
• A significant negative correlation was observed between QTc interval and potassium levels (r=-0.28, P<0.05).

Conclusions:

• Acute psychotic patients presenting to emergency departments commonly have a prolonged QTc interval.
• This finding is potentially linked to hypokalemia and may have clinical significance, especially considering the use of parenteral antipsychotics.
• Monitoring the QT interval in these patients upon emergency admission is clinically relevant.