Hubungan Antara Kompleks Ventrikel Prematur Idiopatik Tipe Independen dengan Fungsi Sistolik Intrinsik Ventrikel Kiri melalui Ekokardiografi Speckle Tracking = Correlation between Independent-Type Idiopathic Premature Ventricular Complex with Left Ventricular Intrinsic Systolic Function assessed by Speckle Tracking Echocardiography