Cilnidipine more highly attenuates cold pressor stress-induced platelet activation in hypertension than does...

Area of Science:

• Cardiology
• Pharmacology

Background:

• The clinical impact of N-type calcium channel blockers remains incompletely understood.
• Hypertension management requires evaluating drug effects on sympathetic activity and platelet function, especially under stress.

Purpose of the Study:

• To compare the effects of cilnidipine and amlodipine on sympathetic nervous system activity and platelet function in hypertensive patients.
• To assess these effects under both resting and cold pressor test (stress) conditions.

Main Methods:

• A crossover study involving 32 hypertensive patients treated with either cilnidipine or amlodipine for 4 weeks.
• Measurements included plasma epinephrine, norepinephrine, beta-thromboglobulin, and ADP-induced platelet aggregation (ADPE50) at rest and after a cold pressor test.
• Treatments were switched after the initial 4-week period.

Main Results:

• No significant differences in resting blood pressure, heart rate, or measured biomarkers were observed between cilnidipine and amlodipine.
• Following the cold pressor test, amlodipine showed significant increases in epinephrine and beta-thromboglobulin, and a decrease in ADPE50.
• Cilnidipine did not elicit these significant changes under stress, and norepinephrine increase was less pronounced compared to amlodipine.

Conclusions:

• Cilnidipine demonstrates a greater ability to attenuate sympathetic nervous system and platelet activation during cold pressor stress compared to amlodipine.
• N-type calcium channel blockade by cilnidipine may offer enhanced protection against stress-induced cardiovascular events in hypertensive individuals.