Approach to the Critical Patient

Immediate stabilization

Airway threats from rigidity and aspiration

Hemodynamic instability from autonomic dysfunction

Hyperthermia management

Monitoring and targets

Monitoring bundle

Escalation triggers

ICU transfer criteria

Key early actions

Reinstate dopaminergic medications immediately

Neurology/Movement Disorders consultation

History

Presentation pattern

Core acute syndrome

Medication and trigger history

Dopaminergic medication changes

Dopamine-blocking agent exposure

Intercurrent illness as trigger

DBS-related triggers

Associated symptoms

Autonomic symptoms

Dysphagia and swallowing

Respiratory symptoms

Risk factor history

Advanced Parkinson's disease

Systemic risk factors

Collateral history sources

Physical Exam

Vital signs

Hyperthermia

Cardiovascular instability

Respiratory rate and oxygen saturation

Neurological exam

Rigidity assessment

Level of consciousness

Reflexes

Autonomic signs

Diaphoresis and skin findings

Sialorrhea

Swallowing assessment

Dysphagia evaluation

PITFALLS

Diagnostic pitfalls

Differential Diagnosis

Primary diagnosis to confirm

Akinetic crisis (Parkinsonism-Hyperpyrexia Syndrome)

Dangerous mimics

Neuroleptic malignant syndrome (NMS)

Serotonin syndrome

Sepsis with altered mental status

Malignant hyperthermia

Secondary mimics

Lethal catatonia

Severe off episode without crisis features

Subdural hematoma

Heat stroke

Laboratory Tests

Rhabdomyolysis workup

Creatine kinase (CK)

Renal and electrolyte panel

Basic metabolic panel

Infection and inflammation labs

Complete blood count

Blood cultures (two sets)

Urinalysis with microscopy

Coagulation and organ function

Coagulation studies

Liver function tests

Lactate

Troponin

Additional targeted labs

Serum magnesium and phosphorus

Urine myoglobin

Diagnostic Tests

Scoring Systems

Woodbury three-stage NMS/akinetic crisis severity system

Hoehn and Yahr staging (baseline PD severity)

MRI

Brain MRI indications in akinetic crisis

CT

CT head without contrast

CT chest

CT abdomen and pelvis

Ultrasound

Point-of-care ultrasound (POCUS)

DAT-SPECT (dopamine transporter SPECT)

Disposition

ICU admission criteria

ICU mandatory for severe presentations

Step-down or telemetry admission

Milder presentations with stable vitals

Observation indications

Subacute motor worsening without crisis features

Consultation triggers

Neurology / Movement Disorders

Critical Care

Nephrology

DBS team / Neurosurgery

Discharge criteria

Resolution of hyperthermia and autonomic instability

Tolerating oral dopaminergic medications safely

CK trending down toward normal

Return to near-baseline motor function

Treatment

Dopaminergic restoration (cornerstone of treatment)

Oral / enteral levodopa/carbidopa

IV amantadine

Subcutaneous apomorphine

Subcutaneous foslevodopa

Bromocriptine (adjunctive dopamine agonist)

Rhabdomyolysis management

Aggressive IV fluid resuscitation

Urine alkalinization (selective use)

Anti-rigidity and hyperthermia therapies

Dantrolene sodium

Lorazepam

Complication management

Electrolyte correction

Hemodynamic support

Infection treatment

Agitation and delirium

Adjunctive therapies (limited evidence)

High-dose IV methylprednisolone

Electroconvulsive therapy (ECT)

Prophylaxis

DVT prophylaxis

Stress ulcer prophylaxis

Pressure injury prevention

Special Populations

Pregnancy

Epidemiology in pregnancy

Medication safety considerations

Obstetric involvement

Geriatric

Increased prevalence and complexity

Medication considerations

Functional considerations

Pediatrics

Rare in pediatric population

Dopaminergic medication dosing in children

Differential diagnosis expanded in children

Background

Epidemiology

Prevalence and incidence of PD

Akinetic crisis incidence

Outcomes data

ED management gap

Pathophysiology

Dopamine deficiency and akinetic crisis

Relationship to NMS

Rhabdomyolysis mechanism

DIC mechanism

Therapeutic Considerations

Dopaminergic therapy is the cornerstone

Contraindicated medications in PD crisis

Evidence base

Prevention strategies

Patient Discharge Instructions

copy discharge instructions

What happened to you

Your Parkinson's medications are critical

When to return to the emergency department immediately

Protecting yourself from another crisis

Diet and activity

Follow-up appointments

References

Guidelines and key sources

Ikebe S, Harada T, Hashimoto T, et al.

Robottom BJ, Weiner WJ, Factor SA.

Onofrj M, Bonanni L, Cossu G, et al.

Pötter-Nerger M, Schrader C, Jost WH, Höglinger G.

Elder NM, Lash EM, Tomkins-Tinch C.

Factor SA, Burkhard PR, Caroff S, et al.

Loeffler MA, Mengel A, Single C, Weiss D, Feil K.

Martino G, Capasso M, Nasuti M, et al.

Wijdicks EFM, Ropper AH.

Steinman MA.

Foltynie T, Bruno V, Fox S, et al.

Tanner CM, Ostrem JL.