Abstract: Objective: To observe the abnormality of the electrocardiogram (ECG) and the characteristics of arrhythmia in the early stage of older pregnant women and to record the late outcome of atrial and ventricular arrhythmia.Methods: Two hundrend and ninty pregnant women were divided into 3 groups by age under 35 group, 35~39 group and 40~45 group. The ECG waveform was analyzed systematically when the patients were subjected to routine ECG examination and abnormal changes of ECG were collected and recorded, including ST segment changes, various arrhythmias, etc. Then the recovery and deterioration rate of atrial, ventricular arrhythmia was recorded.Results: The incidence of arrhythmia in 35~39 group and 40~45 group was significantly higher than under 35 group (P<0.05); the incidence of abnormal ST section in 35~39 group and 40~45 group was significantly higher than under 35 group(P<0.05); and the incidence of widened QRS wave in 40~45 group was higher than under 35 group (P<0.05). The incidence of sinus tachycardia, sinus irregularityand atrial premature beats in 35~39 group and 40~45 group was obviously lower than that under 35 group (P<0.05); the incidence of Paroxysmal supraventricular tachycardia in 40~45 group was obviously higher than under 35 group (P<0.05) and the incidence of ventricular premature beat and atrial fibrillation in 35~39 group and 40~45 group was significantly higher than under 35 group (P<0.05). The recovery rate of atrial arrhythmia in 40~45 group was obviously lower than under 35 group (P<0.05);the exacerbation rate of trial and ventricular arrhythmia in 40~45 group was obviously higher than over 35 group (P<0.05). The incidences of IUGR in 35~39 group and 40~45 group with abnormal ECG was obviously higher than under 35 group and 35~39 group with normal ECG; The incidences of fetal distress in 35~39 year-old group and 40~45 year-old group with abnormal ECG was obviously higher than under 35 group(P<0.05).Conclusion: There is a positive correlation between the old age and the incidence of arrhythmia in the early stage of pregnancy, and old age factors can reduce the recovery rate but increase the incidence of deterioration of arrhythmia. And older pregnant women with abnormal ECG have undesirable effect to perinatal infant.

Key words: older pregnant women, early pregnancy, electrocardiogram, arrhythmia, myocardial ischemia