A 27-year-old male presented to the emergency department with acute exercise induced rhabdomyolysis (EIR) following low intensity, high repetition physical activity. It is paramount for the clinician to consider this diagnosis in the differential of the patient presenting with a complaint of musculoskeletal pain. This case highlights the necessity of staying vigilant for a condition that can develop with seemingly minor, repetitive training of a single muscle group, such as in the exercise of calf raises.
CASEA 27-year-old male medical student presented to the emergency department with report of bilateral lower leg pain. The patient described the pain as crampy in nature, localized to the posterior aspect of both legs in the distribution of the gastrocnemius-soleus complex. Three days prior to arrival the patient engaged in an intensive exercise routine consisting of over 200 calf raises. The patient reported this activity as the only exercise he had preformed and that he did not engage in any routine exercise prior to the episode. Over the course of the preceding two days, the patient developed intense calf pain which impaired his ability to ambulate. The patient also reported the development of brown-colored urine and a generalized sense of weakness which caused him to seek medical attention. The patient had a past medical history significant for an unspecified mood disorder, gastroesophageal reflux disease, and obesity with a body mass index of 36. Surgical history was significant for wisdom teeth extraction. Outpatient medications included omeprazole, ritalin, and wellbutrin. He denied any drug allergies. Social history was negative for alcohol, tobacco, or illicit drug use.His initial presenting vital signs were signifi cant for relative hypertension with a blood pressure of 151/77 mmHg, heart rate of 96 beats per minute, respiratory rate of 16 breaths per minute, and he was afebrile with an oral temperature of 98.4 degrees Fahrenheit. Physical exam revealed a well appearing male in no acute distress. His pulmonary, cardiovascular, and abdominal exams were all unremarkable. On musculoskeletal exam, the patient was noted to have tenderness upon palpation over the posterior aspects of his bilateral lower legs. Of note, the patient was found to have full range of motion, full and symmetric strength testing of the lower extremity muscle groups, and no evidence of edema or calf asymmetry was identifi ed.The emergency physician ordered a complete blood count, basic metabolic panel, total creatine kinase, and urine analysis with associated microscopic evaluation. Results included blood urea nitrogen of 19 mg/dL, creatinine of 1.12 mg/dL, without an available baseline value in the record for comparison, white blood cell count of 9.2×10 3 /μL, hemoglobin of 16.0 g/dL, platelets of 184×10 3 /μL, and a total creatine kinase of 31 166 U/L. Urine analysis revealed a clear yellow appearing urine with a specific gravity of >1.030, qualitatively large blood, and no evidence of nitrates or leukocyte esterase. Microscopic an...