Is Microditus Infectious?

CardioNerds (Amit Goyal and Daniel Ambinder) join Dr. Sonu Abraham (Cardiology fellow, Lahey Hospital and Medical Center), Dr. Amitoj Singh (Internal Medicine Resident, Lahey Hospital and Medical Center), Dr. Ahmed Ghoneem (Internal Medicine Resident, Lahey Hospital and Medical Center, CardioNerds Academy Chief) and Dr. Aanika Balaji (Internal Medicine Resident, Johns Hopkins) for a scrumptious meal on the Boston Harbor as they discuss a case of a young woman with metastatic melanoma on immune checkpoint inhibitors presenting with dyspnea. The presentation, risk factors, work up and management of patients with immune checkpoint inhibitor induced myocarditis are described. The E-CPR segment is provided by Dr. Sarju Ganatra, the founding director of the cardio-oncology program at Lahey Clinic.  CardioNerds Clinical Trialist Dr. Carrie Mahurin (University of Vermont Medical Center) is introduced at the beginning of the episode. A 41-year-old woman presented with mild dyspnea on exertion and non-productive cough. She had a history of Hashimoto thyroiditis, nodular thyroid s/p resection on levothyroxine, and metastatic melanoma on immune checkpoint inhibitor therapy with ipilimumab and nivolumab. She also had a history of obesity and underwent gastric bypass surgery several years prior. Though she lost weight after the surgery, she regained a significant amount and was 244 lbs with a BMI of 42. Her exam findings were remarkable for tachycardia, bilateral pulmonary rales, elevated JVP, and symmetric pedal edema. Investigations revealed a mild troponin elevation, non-specific EKG changes, and TTE with severely reduced left ventricular function (EF 15%) and a low GLS. Cardiac MRI showed patchy delayed myocardial enhancement in a non-ischemic distribution with marked global hypokinesis and EF of 11%. Endomyocardial biopsy confirmed the diagnosis of immune checkpoint inhibitor (ICI) associated myocarditis. The ICI therapy was discontinued and she was treated with high dose intravenous corticosteroids followed by a prolonged oral steroid taper with clinical improvement and complete recovery of left ventricular function. Jump to: Case media - Case teaching - References CardioNerds Case Reports PageCardioNerds Episode PageCardioNerds AcademyCardionerds Healy Honor Roll CardioNerds Journal ClubSubscribe to The Heartbeat Newsletter!Check out CardioNerds SWAG!Become a CardioNerds Patron! Case Media - immune checkpoint inhibitor myocarditis Episode Schematics & Teaching CardioNerds Myocarditis, updated 1.20.21 Pearls - immune checkpoint inhibitor myocarditis ICI-associated myocarditis has a high mortality rate necessitating a high degree of clinical suspicion. When in doubt, check it out! The initial 4 diagnostic pillars include EKG, troponin, BNP and TTE. Cardiac MRI and endomyocardial biopsy help to confirm the diagnosis.Left ventricular function is normal in 50% of these patients with ICI-associated myocarditis, so the ejection fraction is not a sensitive test for ruling this out.Endomyocardial biopsy should be considered in patients with a high clinical suspicion but negative or ambiguous non-invasive imaging.Early initiation of corticosteroids within 24 hours of presentation is associated with better outcomes.ICIs should be discontinued indefinitely in those with Grade 3 or 4 disease. Notes - immune checkpoint inhibitor myocarditis 1. Immune checkpoint inhibitors – What are they and why should we as cardiologists know about them? Immune checkpoint inhibitors (ICI) boost the host immune response against tumor cells by inhibiting the intrinsic brakes of the immune response.There are currently 7 FDA approved drugs in this group: one CTLA-4-blocking antibody called ipilimumab; three PD-1-blocking antibodies [nivolumab, pembrolizumab, and cemiplimab]; and three PD-L1-blocking antibodies [atezolizumab, avelumab, and durvalumab].Like a car,