Distance from an intrauterine hydrophone as a factor affecting intrauterine sound pressure levels produced by the vibroacoustic stimulation test
Article Abstract:
Fetal sound exposure to vibroacoustic stimulation decreases with distance from the fetal ear, but the intensity of the stimulus varies considerably from person to person. A vibroacoustic stimulator is pressed against the mother's abdomen during labor, and the fetal heart rate response to the noise is a measure of fetal wellbeing. Minimizing sound exposure would be desirable. Eight healthy women in labor with ruptured membranes had a receiver inserted into the uterus near the fetal neck. A vibroacoustic stimulator was held against the mother's abdomen at eight locations in random order and sound pressure was measured. Sound pressure varied according to distance from the receiver. Wide differences in sound spectrum were found between women. The spectral pattern also varied with distance within the same woman. More research should be done to determine the minimum sound level that elicits an appropriate fetal heart rate response.
Publication Name: American Journal of Obstetrics and Gynecology
Subject: Health
ISSN: 0002-9378
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
Risks of antepartum cervical examination in multifetal gestations
Article Abstract:
Routine prenatal cervical examination in women pregnant with twins does not appear to increase the risk of preterm delivery or other complications. Preterm delivery is one of the most common complications of multiple-gestation pregnancies. A total of 89 women pregnant with twins were seen at a specialized Twin Clinic at the Medical University of South Carolina. These women had cervical examinations at each visit to determine amount of cervical dilation and risk for preterm labor. These women were compared with 288 women, also pregnant with twins, who only had cervical examinations when medically indicated. Those in the Twin Clinic program had an average of 4.4 to 10.8 cervical exams. The preterm delivery rate was similar between the two groups. Those seen at the Twin Clinic had a lower incidence of premature rupturing of membranes. The routine cervical exam was not associated with an increase in pregnancy complications.
Publication Name: American Journal of Obstetrics and Gynecology
Subject: Health
ISSN: 0002-9378
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Cross-sectional analysis of triplet birth weight. Quantification of cervical change: relationship to preterm delivery in the multifetal gestation
- Abstracts: National allocation of cadaveric kidneys by HLA matching: projected effect on outcome and costs. Bone marrow transplantation after the Chernobyl nuclear accident
- Abstracts: The effect of race on the relationship between fetal death and altered fetal growth. The prevalence of autoantibodies and lupus anticoagulant in healthy pregnant women
- Abstracts: Transabdominal cervicoisthmic cerclage: a reappraisal 25 years after its introduction. Cervical cerclage in the second trimester of pregnancy: a historical cohort study
- Abstracts: Transcervical endoscopic verification of congenital anomalies in the second trimester of pregnancy. Prevention of diabetes-associated embryopathy by overexpression of the free radical scavenger copper zinc superoxide dismutase in transgenic mouse embryos