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Related Concept Videos

Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Glaucoma: Overview01:25

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
Antihypertensive Drugs: Action of Calcium Channel Blockers01:18

Antihypertensive Drugs: Action of Calcium Channel Blockers

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,...
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
Antiepileptic Drugs: Calcium Channel Blockers01:17

Antiepileptic Drugs: Calcium Channel Blockers

Calcium channel blockers, a class of antiepileptic drugs, regulate the flow of calcium ions within neurons.
Calcium channel blockers exert their antiepileptic effects by targeting T-type calcium channels, which are integral to transmitting nerve signals in the central nervous system. These channels allow the passage of calcium ions, which are vital for neuronal communication. By inhibiting T-type calcium channels, calcium channel blockers effectively reduce the release of neurotransmitters and...
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...

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Related Experiment Videos

Risk of Glaucoma Progression in Patients Using a Calcium Channel Blocker: A Propensity-Matched Cohort Study.

Ibrahim Qozat1, Yazan Abubaker1, Pranav Vasu2

  • 1Department of Ophthalmology, Mayo Clinic, Jacksonville, Florida, United States.

Investigative Ophthalmology & Visual Science
|May 21, 2026
PubMed
Summary

Calcium channel blockers (CCBs) may increase the risk of glaucoma progression. Both dihydropyridine and nondihydropyridine CCBs were linked to a higher likelihood of mild to moderate primary open-angle glaucoma (POAG) advancing to severe stages.

Related Experiment Videos

Area of Science:

  • Ophthalmology
  • Pharmacology

Background:

  • Glaucoma is a leading cause of irreversible blindness worldwide.
  • Primary open-angle glaucoma (POAG) is the most common type of glaucoma.
  • Understanding factors influencing POAG progression is crucial for patient management.

Purpose of the Study:

  • To investigate the association between calcium channel blocker (CCB) use and the progression of mild to moderate POAG to severe stages.
  • To determine if different classes of CCBs have varying impacts on POAG progression.

Main Methods:

  • Retrospective cohort analysis of patients with mild to moderate POAG.
  • Stratification of patients based on CCB use (dihydropyridine CCBs [dCCBs] and nondihydropyridine CCBs [ndCCBs]).
  • Propensity score matching to control for confounding variables; calculation of risk ratios (RRs) and 95% confidence intervals (CIs).

Main Results:

  • A total of 7446 patients were analyzed after propensity score matching.
  • Patients using dCCBs showed a significantly higher risk of progression to severe POAG (RR, 1.67; 95% CI, 1.23-2.27).
  • Patients using ndCCBs exhibited an even greater risk of progression to severe POAG (RR, 3.62; 95% CI, 1.97-6.62) compared to controls.

Conclusions:

  • Both dCCBs and ndCCBs are associated with an increased risk of POAG progression from mild to moderate to severe stages.
  • The findings suggest a potential detrimental effect of CCBs on POAG progression.
  • Further research is warranted to elucidate the mechanisms behind this observed association.