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Related Concept Videos

Open Angle Glaucoma: Treatment01:27

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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...
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Angle Closure Glaucoma: Treatment01:28

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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...
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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...
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Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a...
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Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
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Related Experiment Video

Updated: Mar 26, 2026

Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation
08:30

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[SYNCOPE CAUSED BY INTRA-OCULAR TIMOLOL].

Allon Eyal, Eyal Braun, Mohammad E Naffaa

    Harefuah
    |January 30, 2016
    PubMed
    Summary

    Timolol eye drops for glaucoma can cause dangerous systemic side effects like syncope due to beta-blockade. Always inform your doctor about new medications, especially eye drops, to prevent serious health issues.

    Area of Science:

    • Ophthalmology
    • Cardiology
    • Pharmacology

    Background:

    • Timolol eye drops are a common treatment for glaucoma.
    • Topical application can lead to systemic absorption and adverse effects due to beta-adrenoreceptor blockade.

    Observation:

    • A 68-year-old male experienced syncope after starting timolol eye drops for glaucoma.
    • Electrocardiogram revealed sinus bradycardia and prolonged PR interval.

    Findings:

    • The patient's syncope was consistent with the cardiac effects of beta-adrenergic receptor antagonists.
    • Systemic absorption of topical timolol can negatively impact cardiac electrical activity.

    Implications:

    • Highlights the potential for serious systemic side effects from topical medications.

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  • Emphasizes the critical role of comprehensive medical history, including new medication use, in diagnosing syncope.
  • Thorough patient history can prevent unnecessary and costly medical workups.