Recurrent left atrial myxomas in Carney complex: a genetic cause of multiple strokes that can be prevented.

Background: Intracardiac myxomas in Carney complex are significant causes of cardiovascular morbidity and mortality through embolic stroke and heart failure. The genetic, clinical, and laboratory characteristics of Carney complex-related strokes from atrial myxomas have not been described. The regulatory subunit (R1A) of the protein kinase gene (PRKAR1A) is mutated in >60% of patients with Carney complex.

Methods: We studied patients with strokes and cardiac myxomas that were hospitalized in our institution and elsewhere; a total of 7 patients with 16 recurrent atrial myxomas and >14 episodes of strokes were identified.

Results: Neurologic deficits were reported; in 1 patient, an aneurysm developed at the site of a previous stroke. All patients were females, were also diagnosed with Cushing syndrome, and all had additional tumors or other Carney complex manifestations. Other than gender, although there was a trend for patients being overweight and hypertensive, no other risk factors were identified. A total of 5 patients (71%) had a PRKAR1A mutation; all mutations (c418_419delCA, c.340delG/p.Val113fsX15, c.353_365del13/p.Ile118fsX6, c.491_492delTG/p.Val164fsX4, and c.177+1G>A) were located in exons 3 to 5 and introns 2 to 3, and all led to a non-sense PRKAR1A mRNA.

Conclusions: Female patients with Carney complex appear to be at a high risk for recurrent atrial myxomas that lead to multiple strokes. Early identification of a female patient with Carney complex is of paramount importance for the early diagnosis of atrial myxomas and the prevention of strokes.