Thyroid Storm Management

Algorithm Steps

1. ▶

   Start

   Suspected Thyroid Storm

   Severe thyrotoxicosis with systemic decompensation

   1. ●

      Action

      Calculate Burch-Wartofsky Point Scale

      Diagnostic scoring system

      • Temperature: 99-99.9°F (+5), 100-100.9°F (+10), 101-101.9°F (+15), 102-102.9°F (+20), 103-103.9°F (+25), ≥104°F (+30)
      • CNS: Absent (0), Mild agitation (+10), Moderate: delirium/psychosis (+20), Severe: seizure/coma (+30)
      • GI/Hepatic: Absent (0), Moderate: diarrhea/N/V (+10), Severe: jaundice (+20)
      • Heart Rate: 90-109 (+5), 110-119 (+10), 120-129 (+15), 130-139 (+20), ≥140 (+25)
      • Heart Failure: Absent (0), Mild: edema (+5), Moderate: bibasilar rales (+10), Severe: pulm edema (+15)
      • Atrial Fibrillation: Absent (0), Present (+10)
      • Precipitating Event: Absent (0), Present (+10)
      1. ◆

         Decision

         BWPS Score Interpretation

         Determine likelihood of thyroid storm

         • ≥45: Highly suggestive of thyroid storm
         • 25-44: Impending thyroid storm
         • <25: Thyroid storm unlikely
         1. ●

            Action

            1. Immediate Stabilization

            ICU admission, supportive care

            • ICU admission mandatory
            • IV access, cardiac monitoring, pulse oximetry
            • Cooling measures for hyperthermia (avoid aspirin)
            • IV fluids for volume depletion
            • Treat precipitating cause
            • Consider central line for access
            1. ●

               Action

               2. Beta-Blockade

               Control adrenergic symptoms - beta-1 selective preferred

               • Esmolol 250-500 mcg/kg IV bolus, then 50-100 mcg/kg/min (PREFERRED)
               • OR Landiolol (ultra-short acting, Japan guideline preferred)
               • OR Propranolol 60-80 mg PO q4-6h (blocks T4→T3 but higher mortality in CHF)
               • ⚠️ Japan data: Propranolol associated with 7.6x increased mortality in Killip IV CHF
               • Target HR <100 bpm
               • Use beta-1 selective agents in any cardiac compromise
               1. ●

                  Action

                  4. Iodine Therapy

                  Block thyroid hormone release (give 1h AFTER thionamide)

                  • Lugol's solution: 4-8 drops PO q6-8h
                  • OR SSKI: 5 drops PO q6h
                  • OR Sodium iodide: 500-1000 mg IV q12h
                  • If iodine allergic: Lithium 300 mg PO q8h
                  • MUST give 1 hour AFTER thionamide to prevent iodine utilization
                  1. ●

                     Action

                     5. Glucocorticoids

                     Block T4→T3 conversion, treat relative adrenal insufficiency

                     • Hydrocortisone 100 mg IV q8h
                     • OR Dexamethasone 2 mg IV q6h
                     • Treats associated adrenal insufficiency
                     • Inhibits peripheral T4→T3 conversion
                     • Continue until stable
                     1. ●

                        Action

                        6. Continuous Monitoring

                        Close assessment in ICU

                        • Cardiac telemetry (AFib, heart failure)
                        • Temperature q1-2h
                        • Neurologic status
                        • Fluid balance
                        • Labs: TSH, free T4, CBC, LFTs, electrolytes
                        • Watch for LFT abnormalities with PTU
                        1. ◆

                           Decision

                           Response to Treatment?

                           Assess after 24-48 hours

                           1. ✓

                              Outcome

                              Clinical Improvement

                              Continue therapy, plan definitive treatment

                              • Continue medications
                              • Taper as tolerated
                              • Plan definitive therapy: RAI or thyroidectomy
                              • Transition to outpatient management
                           2. ⚠

                              Warning

                              Refractory Storm

                              Consider additional measures

                              • Plasmapheresis/plasma exchange
                              • Cholestyramine 4g PO QID (binds thyroid hormone)
                              • Emergency thyroidectomy (rare)
                              • ECMO if cardiovascular collapse
               2. ⚠

                  Warning

                  ⚠️ CRITICAL: Beta-Blocker in Heart Failure

                  Non-selective beta-blockers increase mortality

                  • AVOID propranolol in CHF - Japan surveys show 7.6x increased mortality
                  • Use esmolol or landiolol (short-acting, beta-1 selective) if HF present
                  • Some patients with thyroid storm may arrest with any beta-blocker
                  • Consider digoxin for rate control (higher doses needed - increased clearance)
                  • Risk-benefit: undertreating tachycardia vs precipitating arrest
            2. ●

               Action

               3. Antithyroid Drugs

               Block thyroid hormone synthesis

               • Propylthiouracil (PTU) 500-1000 mg loading, then 250 mg q4h
               • OR Methimazole 60-80 mg/day in divided doses
               • PTU preferred (also blocks T4→T3 conversion)
               • Give BEFORE iodine (1 hour)
               • PTU preferred in 1st trimester pregnancy