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Antihypertensive Drugs: Action of Calcium Channel Blockers01:18

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Calcium ions are essential to contract smooth muscle cells in blood vessels. They enter these cells through voltage-dependent calcium channels, specifically L-type calcium channels in the cell membrane. These L-type calcium channels are integral to the excitation-contraction coupling process in smooth muscle. When a stimulus is received by smooth muscle cells, their membrane depolarizes. This alteration in membrane potential instigates the opening of L-type calcium channels. As a result,...
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Receptor tyrosine kinase inhibitors (TKIs) and calcium channel blockers (CCBs) are two critical categories of drugs employed in the treatment of pulmonary artery hypertension (PAH). PAH is a disease that causes high blood pressure in the pulmonary arteries, resulting in chest pain, fatigue, and shortness of breath.
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Relationships Between Calcium Channel Blockers and Vascular Function Tests.

Tatsuya Maruhashi1, Masato Kajikawa2, Shinji Kishimoto3

  • 1Department of Cardiovascular Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.

American Journal of Hypertension
|May 16, 2019
PubMed
Summary
This summary is machine-generated.

Calcium channel blockers (CCBs) significantly lower vascular function measures like flow-mediated vasodilation (FMD) and nitroglycerine-induced vasodilation (NID). These effects may limit the use of FMD and NID as cardiovascular prognostic markers in patients on CCB treatment.

Keywords:
arterial stiffnessblood pressurebrachial-ankle pulse wave velocitycalcium channel blockerendothelial functionendothelium-independent vasodilationflow-mediated vasodilationhypertensionnitroglycerine-induced vasodilation

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Area of Science:

  • Cardiovascular Medicine
  • Pharmacology
  • Vascular Biology

Background:

  • The impact of calcium channel blockers (CCBs) on vascular function tests compared to other antihypertensives remains under-investigated.
  • Vascular function assessments are crucial for cardiovascular risk stratification.

Purpose of the Study:

  • To investigate the confounding effects of calcium channel blockers (CCBs) on vascular function tests.
  • To determine if CCBs influence the interpretation of flow-mediated vasodilation (FMD) and nitroglycerine-induced vasodilation (NID).

Main Methods:

  • 1,134 subjects underwent measurements of FMD, nitroglycerine-induced vasodilation (NID), and brachial-ankle pulse wave velocity (baPWV).
  • Data were collected from health-screening examinations and outpatient clinics.
  • Multivariate and propensity score matching analyses were employed to assess CCB effects.

Main Results:

  • Subjects on CCB treatment exhibited significantly lower FMD and NID, and higher brachial-ankle pulse wave velocity (baPWV) compared to non-CCB users.
  • Multivariate analysis confirmed CCB treatment was associated with reduced FMD and NID, but not baPWV.
  • Propensity score matching indicated lower FMD and NID, and larger baseline brachial artery diameter in CCB monotherapy users.

Conclusions:

  • CCB treatment is associated with diminished FMD and NID, potentially due to larger baseline brachial artery diameter.
  • There was no significant association between CCB treatment and baPWV.
  • FMD and NID may not serve as reliable prognostic markers for cardiovascular events in patients taking CCBs.