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Nonarrhythmogenicity of diuretic-induced hypokalemia. Its evidence in patients with uncomplicated hypertension
Insights
Hydrochlorothiazide therapy in patients with uncomplicated hypertension did not increase arrhythmias, even with diuretic-induced low potassium levels. Existing low-grade ventricular ectopy did not worsen during the study.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Diuretic-induced hypokalemia is a potential risk factor for cardiac arrhythmias.
- Uncomplicated hypertension patients typically have normal cardiac function and stress test results.
Purpose of the Study:
- To investigate the incidence of arrhythmias in patients with uncomplicated hypertension during hydrochlorothiazide therapy.
- To assess the impact of diuretic-induced hypokalemia on cardiac rhythm in this patient group.
Main Methods:
- Ambulatory ECG monitoring was performed on 20 patients with uncomplicated hypertension.
- Monitoring occurred after a placebo and at two and four weeks of hydrochlorothiazide therapy.
- Serum potassium levels were measured concurrently.
Main Results:
- Serum potassium levels decreased significantly during hydrochlorothiazide therapy.
- No new arrhythmias were detected in patients without pre-existing ectopy.
- Patients with low-grade ventricular ectopy did not experience an increase in arrhythmia severity.
Conclusions:
- Hydrochlorothiazide therapy for uncomplicated hypertension does not appear to induce arrhythmias, despite causing hypokalemia.
- Patients with pre-existing low-grade ventricular ectopy can tolerate short-term hydrochlorothiazide treatment without progression of arrhythmias.
Abstract:
Twenty patients aged 33 to 69 years with uncomplicated hypertension, no heart disease, and normal stress test results underwent ambulatory ECG monitoring a month after receiving placebo and two and four weeks after hydrochlorothiazide therapy. Serum potassium level (+/- SEM) averaged 4.4 +/- 0.09 mEq/L after the placebo trial and 3.4 +/- 0.07 and 3.0 +/- 0.06 mEq/L after two and four weeks of therapy, respectively. Sixteen patients had no arrhythmias. Four patients had 329 +/- 140 premature ventricular beats (PVBs) while receiving placebo and 341 +/- 203 and 315 +/- 158 PVBs per 24 hours after two and four weeks of therapy, respectively. Thus, patients with uncomplicated hypertension and no arrhythmias before diuretic therapy did not experience arrhythmias as a result of diuretic-induced hypokalemia of one month's duration. Patients with low-grade ventricular ectopy (VE) before therapy did not progress to higher grades of VE after diuretic treatment for four weeks.