[Myocardial hypertrophy in the recipient with twin-to-twin transfusion syndrome]. / Hypertensiv myokardiehypertrofi hos recipienten i tvilling til tvilling-transfusionssyndrom.

In a set of monochorionic-diamniotic twins with twin-to-twin transfusion syndrome, systemic hypertension and biventricular myocardial hypertrophy were found in the recipient. The infant developed mild respiratory distress. A partial exchange transfusion was performed because of polycytaemia. Blood pressure measurements revealed persistent systemic hypertension. Biventricular hypertrophy was demonstrated by echocardiography. Blood pressure normalised after treatment with Nifedipine and the cardiac hypertrophy subsided over the following weeks. A potential contributing mechanism is intrauterine shunting of high renin levels from the donor to the recipient through anastomoses in the placenta.