| Definition: |
A myopathy that is characterized by muscle breakdown (rhabdomyolysis), heat and exertion-related muscle pain (myalgia) and cramping symptoms, severe muscle pain, sudden elevation and subsequent fall of serum creatine phosphokinase levels and products of muscle breakdown in the urine (myoglobinuria). Associated with RYR1 variations. Rhabdomyolysis is associated with a range of external triggers, including strenuous exercise beyond the limit of fatigue, heat stress, illicit drug or alcohol abuse, use of supplements or certain medications, recent viral illness or muscle trauma. |