Moderate potassium supplementation in essential hypertension

Area of Science:

• Cardiology
• Nephrology
• Nutritional Science

Background:

• Essential hypertension affects millions globally, often managed with lifestyle modifications and medication.
• Dietary factors, including sodium and potassium intake, play a crucial role in blood pressure regulation.
• Current guidelines recommend sodium restriction, but the role of potassium supplementation is less defined for mild to moderate cases.

Purpose of the Study:

• To investigate the effect of potassium supplementation on blood pressure in patients with mild to moderate essential hypertension.
• To assess if potassium supplementation impacts urinary sodium excretion.
• To determine the potential of potassium intake as an adjunct to sodium restriction for hypertension management.

Main Methods:

• An eight-week, double-blind, randomized crossover study involving 23 patients with mild to moderate essential hypertension.
• Patients received either slow-release potassium tablets (60 mmol/day) or placebo for one month each, without dietary changes.
• Blood pressure, urinary potassium, and urinary sodium excretion were monitored.

Main Results:

• Potassium supplementation led to a significant 4% reduction in mean supine blood pressure compared to placebo by week four.
• Urinary potassium excretion increased substantially with supplementation (62 to 118 mmol/24 h).
• The observed blood pressure reduction was independent of baseline or placebo-phase urinary sodium excretion.

Conclusions:

• Moderate potassium supplementation offers a small but significant blood pressure reduction in mild to moderate essential hypertension.
• Potassium supplementation can be additive to moderate sodium restriction strategies.
• Increased dietary potassium, achievable through salt substitutes and increased fruit/vegetable intake, may help manage or prevent hypertension, potentially reducing drug reliance.