A 26-year-old man with a recent diagnosis of schizophrenia is initiated on oral haloperidol therapy to manage severe psychotic symptoms. Arrange the following potential medication-induced movement disorders in the standard chronological order of their expected onset, from the earliest to appear to the latest.
- 1Sustained, painful contraction of the neck muscles (torticollis)
- 2Intense subjective urge to move constantly and an inability to sit still
- 3Bilateral resting tremor, shuffling gait, and generalized bradykinesia
- 4Involuntary, repetitive lip-smacking and choreoathetoid tongue movements
Answer
The correct chronological order of onset is: Acute dystonia (earliest), Akathisia, Parkinsonism, and Tardive dyskinesia (latest).
Extrapyramidal side effects emerge in a highly predictable sequence based on the duration of D2 receptor blockade. Acute dystonia is an immediate crisis occurring in hours to days. Akathisia follows in days to weeks. Drug-induced parkinsonism develops over weeks to months. Tardive dyskinesia is a late consequence requiring months to years of exposure.
Step-by-Step Solution
Key Concept
The chronological onset of antipsychotic-induced extrapyramidal symptoms follows a predictable timeline: acute dystonia (hours to days), akathisia (days to weeks), parkinsonism (weeks to months), and tardive dyskinesia (months to years).
Alternative Method
The 'Rule of 4s' mnemonic is highly effective for remembering this timeline: 4 hours (Acute dystonia), 4 days (Akathisia), 4 weeks (Parkinsonism), 4 months (Tardive dyskinesia).
Estimated Time:1m 0s