Severe Course of Peripartum Cardiomyopathy and Subsequent Recovery in a Patient with a Novel TTN Gene-Truncating Mutation.

BACKGROUND Peripartum cardiomyopathy (PPCM) is a potentially life-threatening, pregnancy-associated cause of heart failure affecting previously healthy women. Recent research suggests a possible role of 16-kDa prolactin in promoting cardiomyocyte damage. However, the genetic predisposition is not well recognized. CASE REPORT We report the case of a 25-year-old woman with a severe course of PPCM with left ventricle ejection fraction of 25-30%, complicated by ventricular arrhythmia and postpartum thyroiditis. As no traditional risk factors of PPCM were identified, the patient was referred for genetic testing. Next-generation sequencing revealed a novel titin gene-truncating mutation NM_001267550: p.Leu23499fs/c.70497_40498insT in the proband as well as in her mother. In the patient, a very late recovery >12 months postpartum was observed, which required long-term medical treatment with bromocriptine. CONCLUSIONS PPCM may occur in women with the genetic predisposition, being modified by an interaction of biological factors, such as a high prolactin level, a ventricular arrhythmia, and an autoimmune disorder. Recovery from severe heart failure due to an inherited cardiomyopathy is possible with careful and appropriate medical management.