Chronic pulmonary heart (CPH) stands for presence of hypertrophy and/or dilatation of right heart ventricle caused by pulmonary hypertension as a consequence of diseases that are damaging lungs function or structure. By chronic pulmonary heart are not considered those hypertrophies of right ventricle which are consequences of left cardiopaths or congenital heart anomalies with skips. During the CPH evolution three stages were formed: a) uncomplicated pneumopathology, b) compensated chronic pulmonary heart and c) decompensated chronic pulmonary heart. The disorders of cardiac rhythm are often at decompensated CPH, which is proved by this scientific work as well. 40 sick people diseased of decompensated CPH are treated in purpose to establish the presence and the characteristics of cardiac arrhythmia at these patients. It is established that the major percentage of frequency is made by sinus tachycardia, atrial extrasystols, and ventricular extrasystols. Of 40 examinees 65% had sinus tachycardia, 37,5% atrial extrasystols, 30% ventricular extrasystols and 20% combined atrial and ventricular extrasystols. This proves us that there is a significant percentage of cardiac rhythm disorder frequency at the sick people of decompensated chronic pulmonary heart.