Diuretic therapy and exercise in patients with systemic hypertension

Area of Science:

• Cardiology
• Clinical Pharmacology
• Exercise Physiology

Background:

• Systemic hypertension is a prevalent cardiovascular risk factor.
• Exercise testing is crucial for assessing cardiovascular function in hypertensive patients.
• Hydrochlorothiazide is a common diuretic used in hypertension management.

Purpose of the Study:

• To evaluate the effects of hydrochlorothiazide on exercise-induced physiological changes.
• To assess the impact of hydrochlorothiazide on serum electrolytes and plasma catecholamines during exercise.
• To determine the influence of hydrochlorothiazide on exercise-related arrhythmias.

Main Methods:

• Twenty patients with uncomplicated hypertension participated.
• Treadmill testing was performed twice under placebo and twice under hydrochlorothiazide treatment.
• Measurements included serum potassium, magnesium, plasma catecholamines, and electrocardiographic monitoring at rest, peak exercise, and recovery.

Main Results:

• Exercise significantly increased serum potassium, magnesium, and plasma catecholamines.
• No rebound hypokalemia was observed during the recovery phase.
• No significant differences in the frequency or complexity of ventricular arrhythmias were found between placebo and hydrochlorothiazide treatment periods.

Conclusions:

• Hydrochlorothiazide treatment does not adversely affect exercise-induced electrolyte and catecholamine responses in hypertensive patients.
• Hydrochlorothiazide does not increase the risk of arrhythmias during treadmill testing in this population.
• These findings support the continued use of hydrochlorothiazide in hypertensive patients undergoing exercise evaluation.