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Revista Brasileira de Ginecologia e Obstetrícia. 2004;26(3):248-248
Summary
Revista Brasileira de Ginecologia e Obstetrícia. 2004;26(3):248-248
Summary
Revista Brasileira de Ginecologia e Obstetrícia. 2003;25(4):261-268
DOI 10.1590/S0100-72032003000400007
PURPOSE: to evaluate Doppler velocimetry of the ductus venosus as a noninvasive test of abnormal pH and gas analysis in preterm fetuses with "brain sparing reflex". METHODS: a cross-sectional study was performed. The studied population consisted of 48 pregnant women between the 25th and the 33rd week of gestation, whose fetuses presented brain sparing reflex (umbilical/cerebral ratio >1). The time elapsed between Doppler velocimetry and the birth (cesarean section under peridural anesthesia) was of up to 5 h. The following parameters were studied: S/A ratio of the ductus venosus, pH and base excess (BE) of fetal blood sample (collected from the umbilical vein immediately after birth). The S/A ratio of the ductus venosus was considered abnormal when superior to 3.6. The fetuses were classified according to the gas analysis result. They were considered abnormal when pH <7.26 and BE £ 6 mMol/L. Fisher's test was used for statistical analysis and considered significant when p £ 0.05. RESULTS: there was a significant correlation between umbilical blood gas analysis in preterm fetuses with brain sparing reflex and ductus venosus S/A ratio (p = 0.0000082; Fisher test). Ductus venosus Doppler velocimetry identified 10 of 14 fetuses with abnormal gas analysis. On the other hand, 32 of 34 fetuses with normal gas analysis were correctly identified. The sensitivity of the ductus venosus S/A ratio for the diagnosis of abnormal blood gas analysis was 71%, specificity 94%, false-negative rate 8%, false-positive rate 4%, positive predictive value 83% and negative predictive value 89%. Pretest likelihood, post-test posterior probability following a positive test result (post-test likelihood) and post-test posterior probability following a negative test result (post-test likelihood) were 31, 84 and 10%, respectively. CONCLUSION: the analysis of the ductus venosus S/A ratio is adequate for the diagnosis of abnormal blood gas analysis in preterm fetuses presenting brain sparing reflex.
Summary
Revista Brasileira de Ginecologia e Obstetrícia. 2003;25(4):261-268
DOI 10.1590/S0100-72032003000400007
PURPOSE: to evaluate Doppler velocimetry of the ductus venosus as a noninvasive test of abnormal pH and gas analysis in preterm fetuses with "brain sparing reflex". METHODS: a cross-sectional study was performed. The studied population consisted of 48 pregnant women between the 25th and the 33rd week of gestation, whose fetuses presented brain sparing reflex (umbilical/cerebral ratio >1). The time elapsed between Doppler velocimetry and the birth (cesarean section under peridural anesthesia) was of up to 5 h. The following parameters were studied: S/A ratio of the ductus venosus, pH and base excess (BE) of fetal blood sample (collected from the umbilical vein immediately after birth). The S/A ratio of the ductus venosus was considered abnormal when superior to 3.6. The fetuses were classified according to the gas analysis result. They were considered abnormal when pH <7.26 and BE £ 6 mMol/L. Fisher's test was used for statistical analysis and considered significant when p £ 0.05. RESULTS: there was a significant correlation between umbilical blood gas analysis in preterm fetuses with brain sparing reflex and ductus venosus S/A ratio (p = 0.0000082; Fisher test). Ductus venosus Doppler velocimetry identified 10 of 14 fetuses with abnormal gas analysis. On the other hand, 32 of 34 fetuses with normal gas analysis were correctly identified. The sensitivity of the ductus venosus S/A ratio for the diagnosis of abnormal blood gas analysis was 71%, specificity 94%, false-negative rate 8%, false-positive rate 4%, positive predictive value 83% and negative predictive value 89%. Pretest likelihood, post-test posterior probability following a positive test result (post-test likelihood) and post-test posterior probability following a negative test result (post-test likelihood) were 31, 84 and 10%, respectively. CONCLUSION: the analysis of the ductus venosus S/A ratio is adequate for the diagnosis of abnormal blood gas analysis in preterm fetuses presenting brain sparing reflex.
Summary
Revista Brasileira de Ginecologia e Obstetrícia. 2000;22(5):265-274
DOI 10.1590/S0100-72032000000500003
Purpose: this study, using verapamil, a slow calcium channel blocker, was a randomized, clinical, double blind and placebo controlled trial, whose objective was to observe if there was a uteroplacental and fetoplacental flow variation during its chronic oral use. Methods: 123 patients were accompanied: study group (n = 61), submitted to verapamil 240 mg/day and control group (n = 62), submitted to placebo. These patients were randomized into groups of four women and treatment or placebo was given for thirty days. A flow examination of the uterine arteries and umbilical artery through doppler-velocimetry was recorded. The values of resistance (RI) and pulsatility index (PI) and of the systole/diastole ratio (S/D) of the arteries were compared after the drug administration calculating means and standard deviations. Results: the verapamil group showed RI = 0.82 (0.28), PI = 1.06 (0.12) and S/D = 2.42 (0.51) in the uterine arteries. The placebo group showed RI = 0.75 (0.35), PI = 1.00 (0.18) and S/D = 2.30 (0.38). When we analyzed the umbilical artery, the verapamil group showed RI = 0.73 (0.12), PI = 1.04 (0.13) and S/D = 2.94 (0.32). The placebo group showed RI = 0.70 (0.14), PI = 1.03 (0.07) and S/D = 3.02 (0.78). The statistical analysis of the differences of the means by the F ratio showed that there was no difference between these two groups. Conclusion: this study indicates the use of verapamil for chronic hypertensive pregnants since it does not provoke damage to the uterine and fetal blood flow.
Summary
Revista Brasileira de Ginecologia e Obstetrícia. 2000;22(5):265-274
DOI 10.1590/S0100-72032000000500003
Purpose: this study, using verapamil, a slow calcium channel blocker, was a randomized, clinical, double blind and placebo controlled trial, whose objective was to observe if there was a uteroplacental and fetoplacental flow variation during its chronic oral use. Methods: 123 patients were accompanied: study group (n = 61), submitted to verapamil 240 mg/day and control group (n = 62), submitted to placebo. These patients were randomized into groups of four women and treatment or placebo was given for thirty days. A flow examination of the uterine arteries and umbilical artery through doppler-velocimetry was recorded. The values of resistance (RI) and pulsatility index (PI) and of the systole/diastole ratio (S/D) of the arteries were compared after the drug administration calculating means and standard deviations. Results: the verapamil group showed RI = 0.82 (0.28), PI = 1.06 (0.12) and S/D = 2.42 (0.51) in the uterine arteries. The placebo group showed RI = 0.75 (0.35), PI = 1.00 (0.18) and S/D = 2.30 (0.38). When we analyzed the umbilical artery, the verapamil group showed RI = 0.73 (0.12), PI = 1.04 (0.13) and S/D = 2.94 (0.32). The placebo group showed RI = 0.70 (0.14), PI = 1.03 (0.07) and S/D = 3.02 (0.78). The statistical analysis of the differences of the means by the F ratio showed that there was no difference between these two groups. Conclusion: this study indicates the use of verapamil for chronic hypertensive pregnants since it does not provoke damage to the uterine and fetal blood flow.
Summary
Revista Brasileira de Ginecologia e Obstetrícia. 2004;26(5):355-361
DOI 10.1590/S0100-72032004000500003
OBJECTIVE: to assess through Dopllerfluxometry the S/A ratio of the ductus venosus and determine the cut-off point to identify preterm fetuses with the 'brain sparing phenomenon". METHOD: a cross-sectional study was performed in 60 pregnant women that presented the "brain sparing phenomenon" (umbilical cerebral ratio >1) and gestational age between 25 and 33 weeks. The following parameters were studied: S/A ratio of the ductus venosus, pH and base excess (BE) of a fetal blood sample collected from the umbilical vein immediately after birth. The fetuses were classified according to the gas analysis result. They were considered abnormal when pH <7.20 and BE < -6 mmol/l. A receiver operator characteristic (ROC) curve analysis was performed to examine the relationship between S/A ratio and fetal acidemia. RESULTS: sixty pregnant women in the period of January 1998 to January 2003 were selected. In the moment of the study the gestational age varied from 25 to 33 weeks, with an average of 29.7 weeks (±1.8 weeks). All of the fetuses presented the "brain sparing phenomenon". Among them 14 presented abnormal gas analysis at birth and 46 presented normal gas analysis. The prevalence of fetuses with abnormal gas analysis in the studied material was 23.33%. Significant association was observed between the abnormal ductus venosus velocimetry and abnormal gas analysis at birth (chi2 = 784.44, p < 0.00001) in preterm fetuses with "brain sparing phenomenon". The best cut-off point of the S/A ratio (where the ROC curves bent) was 3.4. CONCLUSION: fetal acidemia in preterm fetuses with "brain sparing phenomenon" may be noninvasively identified by Doppler measurement of the ductus venosus when the S/A rises above 3.4.
Summary
Revista Brasileira de Ginecologia e Obstetrícia. 2004;26(5):355-361
DOI 10.1590/S0100-72032004000500003
OBJECTIVE: to assess through Dopllerfluxometry the S/A ratio of the ductus venosus and determine the cut-off point to identify preterm fetuses with the 'brain sparing phenomenon". METHOD: a cross-sectional study was performed in 60 pregnant women that presented the "brain sparing phenomenon" (umbilical cerebral ratio >1) and gestational age between 25 and 33 weeks. The following parameters were studied: S/A ratio of the ductus venosus, pH and base excess (BE) of a fetal blood sample collected from the umbilical vein immediately after birth. The fetuses were classified according to the gas analysis result. They were considered abnormal when pH <7.20 and BE < -6 mmol/l. A receiver operator characteristic (ROC) curve analysis was performed to examine the relationship between S/A ratio and fetal acidemia. RESULTS: sixty pregnant women in the period of January 1998 to January 2003 were selected. In the moment of the study the gestational age varied from 25 to 33 weeks, with an average of 29.7 weeks (±1.8 weeks). All of the fetuses presented the "brain sparing phenomenon". Among them 14 presented abnormal gas analysis at birth and 46 presented normal gas analysis. The prevalence of fetuses with abnormal gas analysis in the studied material was 23.33%. Significant association was observed between the abnormal ductus venosus velocimetry and abnormal gas analysis at birth (chi2 = 784.44, p < 0.00001) in preterm fetuses with "brain sparing phenomenon". The best cut-off point of the S/A ratio (where the ROC curves bent) was 3.4. CONCLUSION: fetal acidemia in preterm fetuses with "brain sparing phenomenon" may be noninvasively identified by Doppler measurement of the ductus venosus when the S/A rises above 3.4.
