During a morning clinic session, a physician evaluates four different patients who are primarily complaining of involuntary shaking. Match each patient's specific physical examination finding and clinical history to the most accurate diagnostic etiology.
- A 68-year-old man exhibiting a unilateral 4-Hz to 6-Hz 'pill-rolling' movement in his hand that is most pronounced when the limb is fully resting and diminishes when he reaches for his jacket.Parkinson disease
- A 45-year-old woman displaying a symmetric shaking of both hands that becomes prominent when she holds her arms outstretched; she mentions the shaking improves noticeably after drinking a glass of wine.Essential tremor
- A 55-year-old man with multiple sclerosis who demonstrates a coarse, low-frequency oscillation that progressively increases in amplitude as his finger gets closer to the clinician's finger during testing.Cerebellar tremor
- A 24-year-old woman with asthma who suddenly developed a fine, rapid oscillation in both upper extremities shortly after acutely increasing the usage of her short-acting beta-agonist inhaler.Medication-induced tremor
Answer
The unilateral resting tremor corresponds to Parkinson disease; the alcohol-responsive postural tremor corresponds to Essential tremor; the target-approaching intention tremor corresponds to Cerebellar tremor; and the inhaler-associated tremor corresponds to Medication-induced tremor.
Each clinical scenario describes a classic, level-appropriate presentation: Parkinson disease presents as an asymmetric resting tremor; essential tremor is a bilateral action/postural tremor relieved by alcohol; cerebellar tremor is an intention tremor that worsens as it nears a target; and medication-induced tremor occurs after exposure to triggering agents such as beta-agonists. Recognizing these classic patterns is fundamental to formulating an accurate differential diagnosis.
Step-by-Step Solution
Key Concept
Formulating a differential diagnosis for movement disorders by evaluating tremor activation states (rest versus action) and specific modifying factors.