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Mydriasis is frequently induced by drugs for certain ophthalmic examinations and procedures, particularly those requiring visual access to the retina. Fixed, unilateral mydriasis could be a symptom of raised intracranial pressure. The opposite, constriction of the pupil, is referred to as miosis. Both mydriasis and miosis can be physiological.
Dilation and constriction of the pupil. Pupillary response is a physiological response that varies the size of the pupil, via the optic and oculomotor cranial nerve.. A constriction response (), [1] is the narrowing of the pupil, which may be caused by scleral buckles or drugs such as opiates/opioids or anti-hypertension medications.
Tropicamide is an antimuscarinic drug that produces short acting mydriasis (dilation of the pupil) and cycloplegia [7] when applied as eye drops. It is used to allow better examination of the lens , vitreous humor , and retina .
To say that mydriasis is "mainly caused by stimulation of the sympathetic system" is not entirely correct. SNS directly causes mydriasis and PNS interruption indirectly causes mydriasis - neither action is the main one. I'm not a neurologist but I believe mydriasis, whether pharmacologically induced or due to injury or other pathology, due to ...
The big problem, doctors say, is that when you ingest a honey packet, you really don't know what's in it. Some of these products, they say, contain natural ingredients like maca and ginseng − ...
Some elements of the cholinergic crisis can be reversed with antimuscarinic drugs like atropine or diphenhydramine, but the most dangerous effect - respiratory depression, cannot. [ 6 ] The neuromuscular junction, where the brain communicates with muscles (like the diaphragm , the main breathing muscle), works by acetylcholine activating ...
Opioids such as fentanyl, morphine, heroin and methadone (the notable exception being pethidine); Products containing nicotine such as cigarettes, chewing tobacco or gum ...
Laxatives are designed for constipation, not weight loss, and can lead to serious side effects and dangerous complications when used incorrectly. When you lose weight on laxatives, it's from water ...