Related Experiment Videos
Effect of diuretic therapy on ventricular arrhythmias in hypertensive patients with or without left ventricular
Insights
Hydrochlorothiazide (HCTZ) treatment in hypertensive patients, even those with left ventricular hypertrophy (LVH), did not increase ventricular arrhythmias. This study found no significant difference in arrhythmias between patients with and without LVH after HCTZ therapy.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Hypertensive patients with left ventricular hypertrophy (LVH) may face increased sudden death risk with diuretics.
- Echocardiography offers a more sensitive LVH detection method than ECG.
Purpose of the Study:
- To investigate the effect of hydrochlorothiazide (HCTZ) on ventricular arrhythmias in hypertensive patients with and without LVH.
- To assess if HCTZ therapy alters arrhythmia risk in hypertensive individuals with echocardiographically confirmed LVH.
Main Methods:
- Thirty-one hypertensive patients underwent 48-hour ambulatory ECG monitoring before and after 4 weeks of HCTZ (100 mg daily).
- Echocardiography was used to assess left ventricular posterior wall thickness (LVPWT) for LVH presence.
- Patients were stratified into groups based on LVPWT (≥13 mm for LVH, ≤12 mm for non-LVH).
Main Results:
- HCTZ significantly decreased plasma potassium in both LVH and non-LVH groups (p < 0.01).
- No statistically significant increase in premature ventricular contractions (PVCs) or complex ventricular arrhythmias was observed in either group after HCTZ.
- Fewer couplets and ventricular tachycardia runs were noted post-HCTZ, with no significant difference between LVH and non-LVH groups.
Conclusions:
- Thiazide therapy, specifically HCTZ, does not appear to increase ventricular arrhythmias in hypertensive patients.
- The presence of LVH does not significantly alter the risk of developing ventricular arrhythmias during HCTZ treatment.
Abstract:
Recent studies have suggested that hypertensive patients with ECG evidence of left ventricular hypertrophy (LVH) may have increased risk of sudden death when treated with diuretics. In the present study echocardiography was used as a more sensitive index for the presence of LVH. Thirty-one patients with uncomplicated hypertension underwent 48-hour ambulatory ECG monitoring both before any treatment and after 4 weeks of hydrochlorothiazide, (HCTZ), 100 mg daily. In 18 patients with left ventricular posterior wall thickness (LVPWT) greater than or equal to 13 mm (average = 14.4 +/- 0.2 mm) on echocardiogram, plasma potassium decreased from 4.1 +/- 0.3 to 3.3 +/- 0.4 mEq/L with HCTZ (p less than 0.01). Premature ventricular contractions (PVCs) averaged 5.7 +/- 9.9/hr at baseline and 7.1 +/- 16.6/hr following HCTZ (p = NS). The total number of couplets was 29 before and 13 after HCTZ, while four brief runs of ventricular tachycardia occurred only before treatment. In the remaining 13 patients with LVPWT less than or equal to 12 mm (average = 11.2 +/- 0.1 mm), plasma potassium decreased from 4.1 +/- 0.3 to 3.4 +/- 0.5 mEq/L with HCTZ (p less than 0.01). The average number of PVCs was 4.3 +/- 8.0/hr after HCTZ (p = NS). One couplet and one 3-beat run of ventricular tachycardia occurred before and one 3-beat run of ventricular tachycardia after HCTZ. Although more complex arrhythmias were noted in the LVH group, the differences were not statistically significant. These results indicate that thiazide therapy does not increase ventricular arrhythmias either in patients with or without LVH.