Timolol, Dyspnea, and Bradycardia Before a Scheduled IOP Check
Mr. Harmon, 68, has primary open-angle glaucoma and has used timolol 0.5% twice daily for 4 years. He arrives for an IOP check and mentions that for 3 weeks he has been more short of breath climbing stairs and has a dry cough. He uses albuterol two puffs as needed, now up to four times daily. His pulse is 52 bpm and regular; blood pressure is 118/72 mmHg. The chart lists no allergies and no cardiac history. The physician is seeing another patient, and the clinic is running late. The technician is asked to instill Mr. Harmon's timolol because he forgot his bottle at home. Mr. Harmon says, 'The doctor told me these drops are safe-they're just for my eye.' He has no punctal occlusion routine and tilts his head back after instilling drops.
1. Should the technician instill the timolol? What should be done first?
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No. The technician should withhold the timolol dose and notify the physician before instilling it. The combination of increasing dyspnea, albuterol use up to four times daily, and a resting pulse of 52 bpm are red flags for systemic beta-blockade and possible bronchospasm or bradycardia. Timolol is a nonselective beta-blocker and is generally contraindicated in asthma, severe COPD, sinus bradycardia, and higher-grade heart block. The absence of a documented cardiac history does not rule out a problem; the current symptoms and vital signs are more important.
Recheck the pulse and oxygen saturation if available, ask about wheezing, chest pain, dizziness, or syncope, and keep the patient seated. Document the vital signs, symptoms, medication use, and that the dose was held pending physician review. Do not tell the patient to stop the drug permanently on his own.
2. Explain the pharmacology and the systemic risk to the patient in plain language.
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Explain that timolol is a beta-blocker, and even though it is prescribed for the eye, a substantial fraction can be absorbed through the tear ducts and nose into the bloodstream. Once there, it can block beta receptors in the lungs, causing airway narrowing and shortness of breath, and in the heart, causing a slow pulse, low blood pressure, or heart block. This is why the increased albuterol use and pulse of 52 matter.
The label 'safe' means it is approved and appropriate for many patients, not that it has no systemic effects. Show him punctal occlusion: after instilling a drop, close the eye gently and press the inner corner near the nose for 1–2 minutes, wipe excess, and keep the head upright rather than tilting back. This reduces nasolacrimal drainage and systemic absorption.
3. What education and documentation are needed after the physician evaluates him?
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After the physician evaluates him, document the physician's decision, any change in medication, the vital signs, and the teaching provided. Teach one drop at a time, 5 minutes between different drops, not touching the bottle tip, and reporting shortness of breath, wheezing, a persistently slow pulse, dizziness, or fainting. Provide written instructions in plain language and confirm understanding with teach-back.
If he is switched to another agent, explain that the new drop has its own risks and that punctal occlusion still matters. Document that he was told not to stop or restart the timolol without speaking to the physician, and arrange follow-up. Do not document a diagnosis of asthma or heart block; record the symptoms and the physician's assessment.