The Burch-Wartofsky Point Scale (BWPS) is the definitive clinical tool used to distinguish uncomplicated thyrotoxicosis from life-threatening Thyroid Storm.
The Clinical Picture of a Storm
Thyroid storm is an extreme, hyper-metabolic state characterized by severe fever, cardiovascular collapse, and profound neurological dysfunction. Because thyroid hormone levels do not reliably correlate with the severity of the clinical syndrome, the BWPS was developed to quantify the multi-organ damage.
Scoring the Systems
The scale assigns points based on the severity of derangement in specific systems:
- Thermoregulatory: High fever is a hallmark, scoring up to 30 points for temperatures ≥ 104°F.
- Central Nervous System: Ranging from mild agitation (10 pts) to delirium/psychosis (20 pts) to coma (30 pts).
- Gastrointestinal: Unexplained jaundice (20 pts) is a sign of severe hepatic decompensation.
- Cardiovascular: Extreme tachycardia (up to 25 pts), congestive heart failure, and atrial fibrillation (10 pts).
- Precipitating Event: A known trigger (infection, surgery, non-compliance with anti-thyroid meds) adds 10 points.
BWPS = Sum of points from Temperature, CNS, GI, HR, CHF, AFib, and Precipitant history.
Where:
Score >= 45=
Highly likely thyroid storm.Score 25-44=
Impending thyroid storm.Actionable Thresholds
- Score < 25: Unlikely to represent thyroid storm.
- Score 25 - 44: Suggestive of impending storm. Warrants aggressive monitoring and preemptive medical therapy (beta-blockers, thionamides).
- Score ≥ 45: Highly likely thyroid storm. Demands immediate ICU admission and multi-modal endocrine blockade.