Acute renal infarction presenting as hypertensive urgency

ABSTRACT

Case Report A 46-year-old lady with medical history of hypertension, diabetes mellitus, and peripheral neuropathy was admitted to the hospital with the diagnosis of sepsis without septic shock secondary to a right foot pressure ulcer. Her presentation was non-specific as she was complaining of fatigue, myalgia, fever, and chills. Routine COVID-19 test was done on admission and it came back positive despite her denying having any respiratory symptoms. She was being treated with fluids and antibiotics until her third night of admission. According to the patient, she got up to use the restroom when she suddenly noticed weakness in her lower extremities. She thought it may be due to a muscle spasm;hence, she did not notify the medical team. Later, her nurse was routinely checking the patient's blood pressure when she noted a blood pressure of 220/105 mmHg. She then received a total of 3 doses of intravenous labetalol over three hours;however, her blood pressure continued to be elevated. Patient did endorse right flank pain but it was responding to intravenous fentanyl. The on-call physician then proceeded to perform a full physical examination and noted paleness, weakness, and absent pulses in bilateral lower extremities. A STAT computed tomography (CT) angiogram of the abdominal aorta and iliofemoral arteries was performed and it revealed low-density defects in the right kidney compatible with infarcts, occlusive thrombus in the infrarenal abdominal aorta and extensive bilateral arterial thrombosis. Vascular surgery was immediately consulted and they kept the patient on heparin drip and took her to the operation room within few hours for thrombectomies. Her blood pressure improved following the removal of the thrombus and there were no other documented occurrence of uncontrolled hypertension during her hospitalization. Discussion(s) Acute renal infarction is an arterial vascular event that leads to sudden disruption of blood flow in the renal artery. It can often be diagnosed late due to its rare incidence. In addition, it has a nonspecific clinical presentation that can mimic many common causes. The most common causes of renal infarction include atrial fibrillation, endocarditis, ischemic heart disease, hypercoagulable disorders, and spontaneous renal artery dissection. A case report published by Bourgault M, et al. on renal infarction suggested that around 97% had abdominal/flank pain and 48% of patients had marked uncontrolled hypertension at initial presentation of renal infarction. Our patient did not have any of the afore mentioned risk factors except for a possible hypercoagulable state from her COVID-19 infection and she did present with the two most common presentations. In conclusion, clinicians should have a low threshold for the suspicion of renal ischemia in patients with severe hypertension and flank pain. Copyright © 2023 Southern Society for Clinical Investigation.