NPPB and Tachycardia: Some factors that predict the prognosis of patients with PPCM have been proposed before, such as increased NT-proBNP, prolonged QT intervals and sinus tachycardia in electrocardiography (ECG), decreased LVEF, enlarged LV, decreased systolic blood pressure and increased resting heart rate at the time of diagnosis, however this suggestions have not been verified (15–17).