Paradoxical Thromboembolic Ischemic Stroke Following Tissue Plasminogen Activator Instillation for Clogged Central Venous Dialysis Catheter.

Central venous catheters including dialysis catheters are a potential source of venous thrombosis and pose a risk for paradoxical embolic events including ischemic stroke and systemic embolism in patients with a patent foramen ovale (PFO). The adult population with a PFO and patients with a central venous dialysis catheter (CVDC) are at increased risk of a paradoxical embolic event. Since bubble study is not routinely done during echocardiogram in a patient with CVDC, it is difficult to identify at-risk patients for paradoxical embolic events during catheter manipulation, especially for clogged CVDC. We report a rare case of a 79-year-old lady with end-stage renal disease on hemodialysis (HD) using a CVDC who developed a paradoxical embolic ischemic stroke following the use of tissue plasminogen activator (tPA) for unclogging a dialysis catheter. We aimed to highlight the existing risks of thromboembolism associated with the long-term use of central CVDC, especially the potential risk of paradoxical embolism and ischemic stroke with the use of tPA for management of clogged dialysis catheters. We emphasize the questionable need for a bubble study echocardiogram in all patients requiring long-term dialysis catheters.

Isolated Pulmonic Valve Endocarditis.

BACKGROUND Infective endocarditis (IE) has a high mortality rate, even when treated with appropriate antibiotic therapy and surgical intervention. Right-sided endocarditis is in itself rare, with some studies reporting an incidence of 5-10%. The majority of these cases involve the tricuspid valve, and isolated pulmonary valve endocarditis (PVE) is an extremely rare entity affecting less than 2% of patients with infective endocarditis. Identification and early management are crucial to prevent long-term complications and reduce mortality. CASE REPORT We present a patient with a history of essential hypertension and no underlying valvular disease, who underwent dental cleaning and subsequently developed low-grade fever, myalgia, and malaise. This occurred during the flu season, and was initially diagnosed and treated as flu, without any improvement. The patient was later found to be bacteremic with S. mitis, with no identifiable source, and a normal transthoracic echocardiogram (TTE). He was later hospitalized, had a transesophageal echocardiogram, and was found to have a large pulmonic valve vegetation. CONCLUSIONS This case presents an interesting and rare finding of endocarditis, isolated to the pulmonic valve, in an otherwise healthy individual with no predisposing risk factors. The lack of peripheral stigmata, as well as an unremarkable initial outpatient TTE, made the diagnosis more difficult. It should also be noted that current guidelines do not specifically address right-sided endocarditis, and do not specify the role of surgical intervention.