83 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
Achalasia Management Algorithm
 - Botulinum Injection
 - Pharmacotherapy (CCB/nitrates)
 - Pneumatic Dilation
 - Peroral Endoscopic Myotomy
) - Pneumatic Dilation
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
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
Horner's Syndrome
 • Anhidrosis: Diminished sweating of ipsilateral face and neck
 • Miosis: Loss of sympathetic
muscle (impaired dilation