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Is chlorthalidone better than hydrochlorothiazide in reducing cardiovascular events in hypertensives?

George C Roush1, Venkata Buddharaju, Michael E Ernst

  • 1St Vincent's Medical Center, Bridgeport, Connecticut 06606, USA. groush@gcr0.com

Current Opinion in Cardiology
|June 6, 2013
PubMed

Insights

Chlorthalidone (CTDN) is more effective than hydrochlorothiazide (HCTZ) in reducing cardiovascular events (CVEs). Evidence shows CTDN offers superior antihypertensive potency and better outcomes for heart failure and overall CVE reduction.

Area of Science:

  • Cardiology
  • Pharmacology
  • Hypertension Management

Background:

  • Hydrochlorothiazide (HCTZ) is a widely prescribed diuretic.
  • Chlorthalidone (CTDN) is less commonly prescribed, despite potential benefits.
  • Direct comparative trials for cardiovascular event reduction between HCTZ and CTDN are limited.

Purpose of the Study:

  • To compare the efficacy of chlorthalidone (CTDN) versus hydrochlorothiazide (HCTZ) in reducing cardiovascular events (CVEs).
  • To evaluate the comparative antihypertensive potency and effects on cardiovascular health outcomes.

Main Methods:

  • Analysis of head-to-head trials comparing CTDN and HCTZ.
  • Review of observational cohort studies assessing CTDN versus HCTZ.
  • Examination of network meta-analyses of randomized trials involving HCTZ and CTDN.

Main Results:

  • CTDN demonstrates superior antihypertensive potency, especially overnight, due to its longer duration of action compared to HCTZ.
  • Observational data indicate CTDN is associated with lower left ventricular hypertrophy than HCTZ.
  • Network meta-analyses reveal CTDN significantly reduces congestive heart failure and all CVEs compared to HCTZ, with a 21% risk reduction (95% CI 12-28).
  • CTDN's benefit in CVE reduction is evident even when office systolic blood pressure reduction is similar to HCTZ.

Conclusions:

  • Both direct and indirect evidence support CTDN's superiority over HCTZ in reducing cardiovascular events.
  • The findings align with updated hypertension management guidelines favoring CTDN.
  • CTDN represents a more effective therapeutic option for hypertension management concerning cardiovascular risk reduction.
Abstract

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