84 results
#Pharmacology #Phenytoin #Dilantin #Overview #Review
Pharmacology #Phenytoin #Dilantin
Common Medications that Affect Phenytoin Serum Concentrations

Phenytoin is metabolized by several CYP enzymes (mainly 2C19, and
#Medications #Dilantin
Anisocoria - Pupillary Defects - Differential Diagnosis Algorithm

Physiological - Simple Anisocoria ( <O.5mm)
 - Anisocoria equal
Factitious IMPAIRED DILATION ... Preganglionic - No dilation ... Postganglionic - Dilation
Approach to Conjugated Hyperbilirubinemia - Differential Diagnosis Algorithm

1. Definition: T.bili elevation + >20% conjugated
2. Obtain RUQ
look for ductal dilation ... No dilation = intrahepatic
Landolfi’s Sign on Physical Exam

A 73-year-old man presented with shortness of breath. On ocular exam, pupil
ocular exam, pupil dilation ... and diastolic dilation
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Achalasia Management Algorithm
 - Botulinum Injection
 - Pharmacotherapy (CCB/nitrates)
 - Pneumatic Dilation
 - Peroral Endoscopic Myotomy
) - Pneumatic Dilation
Esophageal Crohn's Disease Management Algorithm

Assess for Active Symptoms and for Stricturing/Fistulizing Disease
Stricturing DX:
 • Bx r/o
• Serial Dilation ... / Self-dilation
Argyll Robertson Pupil
Definition:
 - Irregular and small (1-2mm) pupil
 - Light-near dissociation (accommodation remains intact)
 -
Abscent pupillary dilation
Afferent Pupillary Defect

An afferent pupillary defect passing through its timeline. The pupil that does not react
impression of dilation
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Horner's Syndrome
 • Anhidrosis: Diminished sweating of ipsilateral face and neck
 • Miosis: Loss of sympathetic
muscle (impaired dilation