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Salt sensitivity in hypertensive type-1 diabetes mellitus
E Gerdts1, E Svarstad, O L Myking
1Department of Heart Disease, Haukeland Hospital, Norway.
Blood Pressure
|March 1, 1996
Summary
Dietary sodium intake significantly impacts blood pressure in hypertensive type-1 diabetic patients. Sodium restriction is most effective for the salt-sensitive subgroup, regardless of kidney function.
Area of Science:
- Nephrology
- Endocrinology
- Cardiovascular Medicine
Background:
- Hypertension in type-1 diabetes is linked to sodium retention.
- Salt sensitivity may contribute to hypertension in diabetic individuals.
Purpose of the Study:
- To assess the effect of dietary sodium intake on blood pressure in hypertensive type-1 diabetic patients.
- To identify salt-sensitive and salt-resistant individuals within this population.
Main Methods:
- 30 hypertensive type-1 diabetic patients underwent blood pressure monitoring on habitual, low-sodium, and high-sodium diets.
- Patients were classified as salt sensitive if their 24-h mean blood pressure increased >10% from low to high sodium intake.
- Urinary dopamine excretion, diuresis, and blood pressure changes were analyzed.
Main Results:
- 30% of patients were classified as salt sensitive.
- Salt-sensitive patients showed lower baseline urinary dopamine excretion and greater blood pressure reduction during salt depletion.
- Low-sodium diet reduced blood pressure by 4% overall and 9% in salt-sensitive patients.
Conclusions:
- Sodium restriction effectively lowers blood pressure in the salt-sensitive subset of hypertensive type-1 diabetic patients.
- The prevalence of salt sensitivity in this group is comparable to essential hypertensive patients.
- Renal function does not influence the blood pressure response to sodium restriction in salt-sensitive patients.