What dystonia is
Dystonia is a movement disorder characterised by sustained or intermittent muscle contractions that produce abnormal, often repetitive, postures and movements. The contractions may be focal (affecting one body part), segmental (adjacent body parts), multifocal or generalised. Focal dystonia is the most common presentation: cervical dystonia (neck twisting or tilting), blepharospasm (involuntary eyelid closure), oromandibular dystonia (jaw and facial muscle tightening), laryngeal dystonia (voice strain or interruption) and limb dystonia (foot inversion during walking, hand cramping with writing).
Dystonia can be primary (idiopathic, often with a genetic component) or secondary to identifiable causes including cerebral palsy, stroke, traumatic brain injury, certain medications (tardive dystonia from dopamine-blocking agents), neurodegenerative diseases (Parkinson's disease, Wilson's disease) and metabolic disorders. The clinical pattern — task-specific (writing cramp), position-specific (cervical), or generalised — guides classification and treatment. Dystonic tremor may overlap with essential tremor or Parkinsonian tremor, requiring careful characterisation.
- Focal dystonia — cervical, blepharospasm, oromandibular, laryngeal, limb
- Task-specific — writing cramp, musician's dystonia
- Primary (idiopathic) vs secondary (stroke, medication, neurodegeneration)
- Dystonic tremor — irregular, position-dependent, may overlap with other tremors
Related: Neurologist Kathmandu → · Dr. Jitendra Knowledge Hub → · ICHD-3 Topic →
Evaluation and botulinum toxin treatment
Evaluation begins with detailed history of onset, distribution, triggers (posture, task, stress), family history, medication history and functional impact. Neurological examination characterises the movement pattern, assesses for overflow phenomena (involuntary movements spreading to adjacent muscles), and screens for associated neurological signs. Brain imaging may be considered when secondary causes are suspected or when the pattern is atypical for primary dystonia.
Botulinum toxin injections are the primary treatment for most focal dystonias. The toxin is injected into the overactive muscles under electromyographic (EMG) guidance or clinical palpation to improve accuracy. Relief typically begins within 3–7 days, peaks at 2–4 weeks and lasts 3–4 months, requiring repeat injections for sustained benefit. Oral medications (anticholinergics, baclofen, clonazepam) may be used adjunctively or for generalised dystonia. Physiotherapy, posture training and adaptive strategies complement pharmacological treatment. Deep brain stimulation (DBS) is considered for medically refractory generalised or segmental dystonia. Dr. Jitendra Prasad Yadav (NMC 8029) provides evaluation and botulinum toxin management planning at Kathmandu Neurology Clinic & Cognitive Center, Durbar Marg, Opposite of Yak & Yeti Hotel.
- Botulinum toxin injections — first-line for focal dystonia, EMG-guided
- Relief in 3–7 days, peaks at 2–4 weeks, lasts 3–4 months
- Oral medications — anticholinergics, baclofen, clonazepam for adjunct/generalised
- Physiotherapy and posture training — complement pharmacological treatment
- Deep brain stimulation — for medically refractory generalised or segmental dystonia