Value of ST-T changes and heart rate variability in pulmonary heart disease during 24 h dynamic electrocardiography examination

PURPOSE This study was designed to analyze the value of 24 h dynamic electrocardiography (DCG) examination in the diagnosis of pulmonary heart disease (PHD). METHODS Ninety cases of patients with PHD were included as the observation group, and 50 cases of healthy patients were enrolled as the healthy group. Both groups received DCG examination. RESULTS The proportion of ST depression and elevation as well as the magnitude and duration of ST depression differed significantly between the observation and healthy group (P < 0.05), and the magnitude of ST elevation in patients of the observation group with decompensated heart failure was greater than that of patients with compensated cardiac function and the healthy group (P < 0.05). The incidence rates of sinus bradycardia (SB), ventricular premature beats (VPB), paroxysmal ventricular tachycardia (PVT), and ventricular fibrillation (VF) in patients in the observation group with decompensated heart failure were higher than those of patients with compensated cardiac function and the healthy group (P < 0.05). The differences in standard deviation of the NN (R-R) intervals (SDNN) and standard deviation of average NN intervals (SDANN) between the three groups were significant, and the root mean square of successive RR intervals (RMSSD) of patients in the observation group with decompensated heart failure were lower than those of the healthy group (P < 0.05). The differences in deceleration capacity (DC), left ventricular ejection fraction (LVEF), and heart rate variability (HRV) between the three groups were significant (P < 0.05). CONCLUSION The results obtained by DCG examination can help clinical assessment of cardiac function in the decompensated or compensated stage, which can assist in judging the condition of PHD and guide clinical treatment.