Prophylactic oral betamimetics for reducing preterm birth in women with a twin pregnancy

Abstract

There is insufficient evidence to support or refute the use of prophylactic oral betamimetics for preventing preterm birth in women with a twin pregnancy.

Cervical Length and Perinatal Outcome

“…Since the 22nd week of gestation and every 2 weeks, there was a steady gradual decrease in the cervical length of the study population. The pattern of this decrease was even present in women who did not eventually give birth before 32 weeks of gestation, and this finding was consistent with existing literature data [48,[51][52][53][54]. Ramin observed that this decline became apparent after the 20th week of pregnancy, while Hiersch observed a faster rate of cervical length reduction in triplet pregnancies compared to that noted in twin pregnancies.…”

“…In this study, early risk factors, such as previous history of preterm birth, were found to be consistent with those of other studies, and the main finding of this study was the inability to predict women who would eventually be led to premature birth since cervical length was similar to women who gave birth at term compared to the ones who gave birth prematurely, regardless of the presence of risk factors. In other words, the cervical length measured at 14 weeks of gestation appeared in this study, similar between women at high risk of preterm birth and women at low risk [54][55][56][57][58].…”

“…Moreover, in a study by Guzman, cervical length assessment was performed in 469 high-risk preterm Cervical Length and Perinatal Outcome DOI: http://dx.doi.org/10.5772/intechopen.113835 labor women with continuous ultrasound measurements between 14 and 24 weeks of gestation. Thus, the cervical length was found to be shorter at 21-24 weeks of gestation than at 15-20 weeks of gestation [54][55][56][57][58].…”

“…A study by Hassan found that a "short" cervix at 14-19 weeks is a weaker predictor of preterm birth than an ultrasound assessment of cervical length in mid-pregnancy. Contradictory results were presented by Hasegawa, as well as by Zorzoli, who found in their studies no association between "early" cervical ultrasound assessment and preterm birth [54][55][56][57][58].…”

Cervical Length and Perinatal Outcome

“…Since the 22nd week of gestation and every 2 weeks, there was a steady gradual decrease in the cervical length of the study population. The pattern of this decrease was even present in women who did not eventually give birth before 32 weeks of gestation, and this finding was consistent with existing literature data [48,[51][52][53][54]. Ramin observed that this decline became apparent after the 20th week of pregnancy, while Hiersch observed a faster rate of cervical length reduction in triplet pregnancies compared to that noted in twin pregnancies.…”

“…In this study, early risk factors, such as previous history of preterm birth, were found to be consistent with those of other studies, and the main finding of this study was the inability to predict women who would eventually be led to premature birth since cervical length was similar to women who gave birth at term compared to the ones who gave birth prematurely, regardless of the presence of risk factors. In other words, the cervical length measured at 14 weeks of gestation appeared in this study, similar between women at high risk of preterm birth and women at low risk [54][55][56][57][58].…”

“…Moreover, in a study by Guzman, cervical length assessment was performed in 469 high-risk preterm Cervical Length and Perinatal Outcome DOI: http://dx.doi.org/10.5772/intechopen.113835 labor women with continuous ultrasound measurements between 14 and 24 weeks of gestation. Thus, the cervical length was found to be shorter at 21-24 weeks of gestation than at 15-20 weeks of gestation [54][55][56][57][58].…”

“…A study by Hassan found that a "short" cervix at 14-19 weeks is a weaker predictor of preterm birth than an ultrasound assessment of cervical length in mid-pregnancy. Contradictory results were presented by Hasegawa, as well as by Zorzoli, who found in their studies no association between "early" cervical ultrasound assessment and preterm birth [54][55][56][57][58].…”

Attitudes, Perceptions and Determinants of Non-Medically Indicated Caesarean Section Preference Among Pregnant Women in Thailand: A Three-Phase Mixed-Methods Study

“……”

Cervical Length and Perinatal Outcome

“…Since the 22nd week of gestation and every 2 weeks, there was a steady gradual decrease in the cervical length of the study population. The pattern of this decrease was even present in women who did not eventually give birth before 32 weeks of gestation, and this finding was consistent with existing literature data [48,[51][52][53][54]. Ramin observed that this decline became apparent after the 20th week of pregnancy, while Hiersch observed a faster rate of cervical length reduction in triplet pregnancies compared to that noted in twin pregnancies.…”

“…In this study, early risk factors, such as previous history of preterm birth, were found to be consistent with those of other studies, and the main finding of this study was the inability to predict women who would eventually be led to premature birth since cervical length was similar to women who gave birth at term compared to the ones who gave birth prematurely, regardless of the presence of risk factors. In other words, the cervical length measured at 14 weeks of gestation appeared in this study, similar between women at high risk of preterm birth and women at low risk [54][55][56][57][58].…”

“…Moreover, in a study by Guzman, cervical length assessment was performed in 469 high-risk preterm Cervical Length and Perinatal Outcome DOI: http://dx.doi.org/10.5772/intechopen.113835 labor women with continuous ultrasound measurements between 14 and 24 weeks of gestation. Thus, the cervical length was found to be shorter at 21-24 weeks of gestation than at 15-20 weeks of gestation [54][55][56][57][58].…”

“…A study by Hassan found that a "short" cervix at 14-19 weeks is a weaker predictor of preterm birth than an ultrasound assessment of cervical length in mid-pregnancy. Contradictory results were presented by Hasegawa, as well as by Zorzoli, who found in their studies no association between "early" cervical ultrasound assessment and preterm birth [54][55][56][57][58].…”

Attitudes, Perceptions and Determinants of Non-Medically Indicated Caesarean Section Preference Among Pregnant Women in Thailand: A Three-Phase Mixed-Methods Study

“……”

Cervical Length and Perinatal Outcome

“…Since the 22nd week of gestation and every 2 weeks, there was a steady gradual decrease in the cervical length of the study population. The pattern of this decrease was even present in women who did not eventually give birth before 32 weeks of gestation, and this finding was consistent with existing literature data [48,[51][52][53][54]. Ramin observed that this decline became apparent after the 20th week of pregnancy, while Hiersch observed a faster rate of cervical length reduction in triplet pregnancies compared to that noted in twin pregnancies.…”

“…In this study, early risk factors, such as previous history of preterm birth, were found to be consistent with those of other studies, and the main finding of this study was the inability to predict women who would eventually be led to premature birth since cervical length was similar to women who gave birth at term compared to the ones who gave birth prematurely, regardless of the presence of risk factors. In other words, the cervical length measured at 14 weeks of gestation appeared in this study, similar between women at high risk of preterm birth and women at low risk [54][55][56][57][58].…”

“…Moreover, in a study by Guzman, cervical length assessment was performed in 469 high-risk preterm Cervical Length and Perinatal Outcome DOI: http://dx.doi.org/10.5772/intechopen.113835 labor women with continuous ultrasound measurements between 14 and 24 weeks of gestation. Thus, the cervical length was found to be shorter at 21-24 weeks of gestation than at 15-20 weeks of gestation [54][55][56][57][58].…”

“…A study by Hassan found that a "short" cervix at 14-19 weeks is a weaker predictor of preterm birth than an ultrasound assessment of cervical length in mid-pregnancy. Contradictory results were presented by Hasegawa, as well as by Zorzoli, who found in their studies no association between "early" cervical ultrasound assessment and preterm birth [54][55][56][57][58].…”

Attitudes, Perceptions and Determinants of Non-Medically Indicated Caesarean Section Preference Among Pregnant Women in Thailand: A Three-Phase Mixed-Methods Study

“……”