Severe Cardiovascular Effects of Prolonged Untreated Hyperthyroidism Manifesting As Thyroid Storm

A thyroid storm is a rare but life-threatening manifestation of thyrotoxicosis. It still remains a diagnostic challenge as there are no specific laboratory investigations or universally accepted criteria for diagnosing thyroid storms. Diagnosis is mainly based on clinical findings, evidence of hyperthyroidism, and life-threatening symptoms. A thyroid storm has a high risk of mortality mostly due to multi-organ failure and heart failure. Cardiovascular manifestations are the most common presentation of hyperthyroidism; cardiac involvement also has the potential to be the most serious complication. Management of cardiovascular manifestations should be managed aggressively to prevent long-term myocardial damage. A high index of suspicion should be maintained in young adults presenting with heart failure and arrhythmia. We present a case of potentially life-threatening cardiovascular effects of thyroid storm and management in the ICU.