A Case of Diabetic Ketoacidosis Presented With Severe Rhabdomyolysis-Induced Acute Kidney Injury

We present a patient who presented with diabetic ketoacidosis and severe rhabdomyolysis-induced acute kidney injury. The patient developed generalized edema, nausea, and vomiting, and his kidney function deteriorated, necessitating renal replacement therapy, despite the successful treatment of his initial conditions. A comprehensive evaluation was conducted to determine the underlying cause of the severe rhabdomyolysis, including autoimmune myopathies, viral infections, and metabolic disorders. A muscle biopsy revealed necrosis and myophagocytosis but no significant inflammation or myositis. The patient's clinical and laboratory results improved with appropriate treatment, including temporary dialysis and erythropoietin therapy, and he was discharged to continue his rehabilitation with home health care.


Introduction
Diabetic ketoacidosis (DKA) is a serious diabetes complication with relative insulin deficiency with less endogenous or exogenous administration, resulting in high blood sugar and ketone production. It can cause metabolic disturbances and organ failure or death. The most common precipitating factor is infection. Treatment entailed prompt insulin administration and correcting fluid and electrolyte imbalances to prevent complications such as cerebral edema and acute kidney injury [1].
Rhabdomyolysis is a clinical syndrome that releases myoglobin, creatine kinase, and other muscle breakdown products into the bloodstream. Various factors, such as trauma, drugs, infections, and metabolic disorders, can cause rhabdomyolysis, resulting in complications such as acute kidney injury, electrolyte imbalances, and metabolic acidosis. In this instance, the patient developed severe rhabdomyolysis, likely caused by hyperglycemia and dehydration associated with DKA and other factors. In this instance, the management of rhabdomyolysis included aggressive fluid resuscitation and electrolyte replacement, as well as monitoring for acute kidney injury and other complications [2].

Case Presentation
We present the case of a morbidly obese 33-year-old male with no significant past medical history in the past. He arrived at the emergency department with an altered mental status and red urine. The patient's blood pressure was 110/50 mmHg, his heart rate was 90 beats per minute, and his respiratory rate was 24 breaths per minute. The patient was lethargic and not disoriented to person, place, or time, but verbal stimuli elicited a response. Oral mucous membranes were dry, and generalized muscle tenderness was noted on the physical exam. A bedside point of care ultrasound (POCUS) revealed inferior vena cava less than 1.5 cm in diameter with near total collapse on inspiration, suggesting intravascular volume depletion and a hyperdynamic left ventricle. Routine labs were obtained at the time of presentation (  The patient was admitted to the intensive care unit (ICU) to treat DKA and acute kidney injury (AKI) caused by severe rhabdomyolysis. Over the following two days, the patient received 2 L of fluid bolus followed by continuous intravenous fluids with an average daily fluid intake of 5.5 L and average daily urine output of 2.6 L. This was accompanied by a downtrend in serum creatinine from 5.02 on admission to 1.69 on the third day. Insulin infusion continued until the anion gap closed and the DKA resolved. The hypernatremia gradually improved within 10 days of the diagnosis, and a normal serum sodium level was reached. Despite recovery from diabetic ketoacidosis and correction of hypernatremia, the patient developed generalized edema.
He continued to experience nausea and vomiting and remained lethargic with fluctuating mental status. Despite aggressive therapy with intravenous fluids, creatinine kinase (CK) remained elevated, and serum blood urea nitrogen (BUN) and creatinine levels trended again with a peak of 138 and 6.48, respectively. The patient had an average daily urine output of 2 L and net 1 to 4 L positive daily fluid shift. The urine protein creatinine ratio and the urea concentration in urine were noted to be 1.6 and 716 mg/dL, respectively. The patient developed nonhemolytic blood loss with a gradual hemoglobin drop to 6.6 g/dl with an elevated haptoglobin of 304 mg/dL and reticulocytes of 2.47%, which warranted a blood transfusion. Although serum CK decreased on the eleventh day to 5310 U/L, a subsequent rise of 11,371 U/L, the daily fluid retention, and ineffective diuresis prompted the start of renal replacement therapy with hemodialysis.
The workup of severe rhabdomyolysis and myositis has been done (Tables 2, 3). The right rectus femoris muscle biopsy revealed scattered atrophic and necrotic myofibers with segmental necrosis and myophagocytosis. However, there were no signs of significant inflammation, myositis, vasculitis, or evidence of group or selective atrophy, vacuolar changes, or dystrophic findings.    The patient's clinical and laboratory results improved significantly with temporary dialysis. The kidney function improved, and the CK level decreased. Anemia improved with weekly Aranesp and ferrous sulfate. The patient was discharged to continue rehabilitation with home health care.

Discussion
Rhabdomyolysis refers to the rapid breakdown of skeletal or striated muscle. Therefore, it is characterized by muscle fiber rupture and necrosis, which releases cellular products into the blood and extracellular space [3]. In the United States, approximately 26,000 cases of rhabdomyolysis require hospitalization per year [4].
Males, African Americans, people aged 10 to 60, and those with body mass indices greater than 40 kg/m 2 appear to be more susceptible to the disease, which corresponds to our case sex, age, race, and BMI [5].
The etiology of rhabdomyolysis is classified into genetic or acquired; genetic causes include diseases of lipids or carbohydrate metabolisms like McArdle's disease and Tarui's disease, while acquired causes are further divided into traumatic including crush injuries, electrical injuries, compression, and vascular or orthopedic surgeries, and non-traumatic including vigorous exercises, seizures, sickle cell trait, exposure to extreme heat, malignant hyperthermia and neuroleptic malignant syndrome, alcohol, infections, electrolyte imbalance and drugs/toxins [6].
Depending on the degree and severity of muscle damage, rhabdomyolysis can present clinically in a wide range of ways, from an asymptomatic rise in serum levels of enzymes released from muscle cells, such as CK, LDH, and AST, to dire conditions like severe hypervolemia, metabolic acidosis, multiple electrolyte abnormalities, including hyperkalemia, hyperphosphatemia, and hypocalcemia, and acute kidney failure.