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Hypertension in a patient with hypercalcemia: captopril and verapamil
Insights
Hypercalcemia may increase sensitivity to angiotensin II, causing rebound hypertension during captopril treatment. Combining verapamil with captopril and spironolactone effectively controlled blood pressure in a hypertensive patient.
Area of Science:
- Nephrology
- Cardiovascular Medicine
- Endocrinology
Background:
- Severe hypertension, hypercalcemia, and high renin levels present a complex clinical challenge.
- Angiotensin-converting enzyme (ACE) inhibitors like captopril are used to manage hypertension.
- Calcium channel blockers and mineralocorticoid receptor antagonists are also utilized in blood pressure management.
Observation:
- A patient with hypercalcemia and severe hypertension experienced intermittent rebound hypertension despite high-dose captopril therapy.
- Adding spironolactone improved blood pressure control but did not fully resolve rebound hypertension.
- Verapamil alone did not control blood pressure, but its combination with captopril and spironolactone normalized BP.
Findings:
- High plasma calcium levels appear to sensitize arterioles to angiotensin II fluctuations during ACE inhibitor therapy.
- Combined therapy with verapamil, captopril, and spironolactone achieved sustained blood pressure normalization.
- Reduced frequency of captopril administration was possible with the combination therapy.
Implications:
- This case suggests a potential interaction between calcium metabolism and the renin-angiotensin system in hypertension.
- Verapamil may mitigate the effects of angiotensin II surges in hypercalcemic patients on ACE inhibitors.
- Further research is warranted to explore the role of calcium in ACE inhibitor-induced hypertension and its management.
Abstract:
A 38-year-old woman with hypercalcemia, severe hypertension, and high renin levels was treated with the angiotensin-converting enzyme inhibitor captopril. This therapy, together with spironolactone, normalized blood pressure (BP), but even with three daily administrations of the converting enzyme inhibitor, intermittent rebound hypertension could not be avoided. The administration of only verapamil, an antagonist of calcium transport, did not induce BP control, but when verapamil therapy was combined with administration of captopril and spironolactone, BP could be normalized with only twice-daily administration of the converting enzyme inhibitor. Thus, high plasma calcium levels seem to sensitize the arterioles to the intermittent increase of angiotensin II levels that accompanies captopril therapy.