Lyme Carditis Accompanied with Pseudomonal Pneumonia: A Case Report

Lyme disease is a vastly underdiagnosed disease, and its frequency is steadily rising. It is commonly diagnosed clinically and treated empirically, due to the time required for testing and the inefficiency of laboratory testing methods. Although there are a few reported cases of Lyme carditis, the variation in the clinical presentation and the treatment provided differ significantly. Herein, we present the case of a man who presented in July 2022 with a non-productive cough and low-grade fever along with mild body aches. The patient had an incidental atrial flutter with a 2:1 atrioventricular block, a large thick-walled cavitary lesion in the apex of the left lung, left upper lobe ground-glass opacities, and scattered micronodules in the left lower lobe. He was clinically diagnosed with Lyme carditis despite testing negative for Lyme antibodies. This was in combination with Pseudomonal pneumonia. Here we review recent cases of Lyme carditis and discuss the difficulty of the efficiency of serological testing for Lyme disease.