Study on the changes of cardiac reserve function during normal vaginal delivery
10.3760/cms.j.issn.0529-567x.2012.03.003
- VernacularTitle:阴道分娩过程中产妇心脏储备功能的变化
- Author:
Yanwei LIN
;
Yong SHAO
;
Jianhua ZHANG
- Publication Type:Journal Article
- Keywords:
Labor,obstetric;
Uterine contraction;
Heart rate;
Kinetocardiography
- From:
Chinese Journal of Obstetrics and Gynecology
2012;47(3):171-174
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the trend of cardiac reserve function during the normal labor.Methods Sixty-three cases were chosen randomly from hospitalized maternal women in the First Affiliated Hospital of Chongqing Medical University from 2010 June to December ( six months).The digital technique of heart sound signal processing was used to analysize cardiac reserve function parameters including the heart rate ( HR),the ratio of the amplitude of the first heart sound to the second heart sound and the ratio of diastolic to systolic duration (D/S) of pregnant women.Results ( 1 ) Comparisons of cardiac reserve function between uterine contractions and relaxations during labor:①Latent phase of labor ( cervix dilation ＜ 3 cm ):HR was ( 87.3 ± 14.0 ) beats/min in uterine contractions and ( 82.8 ± 12.5 )beats/min in uterine relaxations,the ratio of D/S was 1.14 ±0.27 in uterine contractions and 1.21 ±0.22 in uterine relaxations,the comparisons of the above two were statistically significant,P ＜0.05 ; But the ratio of S1/S2 was 2.19 ±0.82 in uterine contractions and 2.28 ±0.81 in ueterine relaxations,the comparison was not statistically significant,P ＞ 0.05.② During early active stage of labor ( cervix dilation 3-6 cm):HR was (89.3 ± 15.4) beats/min in uterine contractions and (83.1 ± 13.5) beats/min in uterine relaxations,the ratio of D/S was 1.09 ± 0.30 in uterine contractions and 1.20 ± 0.27 in uterine relaxations,the comparisons of the above two were statistically significant,( P ＜0.05 ) ;But the ratio of S1/S2 was 2.42 ± 1.08 in uterine contractions and 2.29 ±0.83 in ueterine relaxations,the comparison was not statistically significant ( P ＞0.05 ); ③During late active stage of labor (cervix dilation 6-10 cm),HR was (95.4 ± 18.7 ) beats/min in uterine contractions and (86.2 ± 15.6) beats/min in uterine relaxations,the ratio of D/S was 1.01 ±0.25 in uterine contractions and 1.18 ± 0.25 in uterine relaxations,the comparisons of the above two were statistically significant,( P ＜ 0.05 ) ; But the ratio of S1/S2 was 2.61 ± 1.26 in uterine contractions and 2.67 ± 1.19 in ueterine relaxations,the comparison was not statistically significant ( P ＞ 0.05 ).④ The second stage of labor (cervical dilation ≥ 10 cm ):HR was (109.4 ± 19.7 ) beats/min in uterine contractions and (93.5 ± 16.7 ) beats/min in uterine relaxations,the ratio of D/S was 0.89 ± 0.23 in uterine contractions and 1.14 ±0.26 in uterine relaxations,the ratio of S1/S2 was 3.66 ± 1.37 in uterine contractions and (2.81 ± 1.07 ) in uterine relaxations,the comparisons of all were statistically significant (P＜0.05).(2)Comparison of cardiac reserve function in uterine relaxations of each stage of labor:①Maternal heart rate gradually increased from latent stage of labor to the second stage of labor,and decreased postpartum,the comparison was statistically significant ( P ＜ 0.05 ) ;② The ratio of S1/S2 of maternal gradually increased from latent stage of labor to the second stage of labor,and decreased postpartum,the comparison was statistically significant( P ＜0.05 ) ;③ The ratio of D/S gradually decreased from latency to the second stage of labor,and increased postpartum,the comparison was statistically significant( P ＜0.05 ).(3) Comparison of cardiac reserve function in uterine contractions of each stage of labor:① Maternal heart rate gradually decreased from latent stage of labor to the second stage of labor,the comparison was statistically significant( P ＜ 0.05 ) ;② The ratio of S1/S2 of maternal gradually increased from latent stage of labor to the second stage of labor,the comparison was statistically significant( P ＜ 0.05 ) ; ③ The ratio of D/S gradually decreased from latency to the second stage of labor,the comparison was statistically significant (P ＜0.05).Conclusions The maternal cardiac reserve function decreased in uterine contractions than relaxation during labor; With the progress of labor,the maternal cardiac reserve function declined,especially in the second stage of labor,and recovered in postpartum stage.
