Fetal acoustic stimulation in early labor in patients screened with the admission test

Ingemarsson, L.; Arulkumaran, Sabaratnam; Paul, R H; Ingemarsson, Eva; TambyRaja, R. L.; Ratnam, S. S.

doi:10.1016/0002-9378(88)90780-6

Cited by 53 publications

(32 citation statements)

References 9 publications

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“…Three different response patterns to VAS were classified in the present study, as reported previously by Ingemarsson et al 19 In pregnant women with high trait anxiety, the FHR response after VAS showed a predominantly type II pattern rather than the expected normal type I response. Mean maximum amplitude of acceleration of FHR after VAS was significantly lower in the high trait anxiety group compared with the low trait anxiety group.…”

Section: Discussionsupporting

confidence: 71%

Effect of Maternal Stress on Fetal Heart Rate Assessed by Vibroacoustic Stimulation

Makino

Matsuda²,

Yoneyama³

et al. 2009

J Int Med Res

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This study was designed to determine whether maternal stress levels, state and trait anxiety levels, and stress hormones affect fetal heart rate (FHR) patterns after vibroacoustic stimulation (VAS) at 30 weeks of gestation. A total of 24 healthy pregnant women with a single fetus pregnancy were enrolled. Corticotropin releasing hormone (CRH) and adrenocorticotropic hormone in maternal plasma and cortisol, and chromogranin A in saliva were measured. The FHR patterns after VAS were divided into three types: type I, a long period of acceleration or one acceleration lasting > 1 min or at least two accelerations lasting > 15 s; type II, a biphasic response with acceleration followed by deceleration; and type III, no response or prolonged deceleration. In the high trait anxiety group, CRH levels were significantly higher than in the low trait anxiety group, and FHR patterns after VAS showed mostly a type II response pattern. These findings suggest that stress in pregnant women with high trait anxiety may influence FHR patterns after VAS.

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Section: Discussionsupporting

confidence: 71%

Effect of Maternal Stress on Fetal Heart Rate Assessed by Vibroacoustic Stimulation

Makino

Matsuda²,

Yoneyama³

et al. 2009

J Int Med Res

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“…The exact mechanism or cause of how sound stimulation to the fetus evokes an FHR change is not clearly known. Certainly, the fetal cochlea is not the only mechanism involved, as sound stimulation below the audible range can still give fetal reaction in labor [9,10,12]. These observations suggest the possibility of involvement of cutaneous and vestibular organs through sensory pathways.…”

Section: Discussionmentioning

confidence: 99%

Vibroacoustic Stimulation - Does it Really Help?

Jamal

1993

Ann Saudi Med

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One of the major objectives of perinatal medicine is to look for better means of testing for fetal well-being in utero. This prospective study measured the antenatal fetal heart rate changes in response to fetal acoustic stimulation using artificial electronic larynx (Model 5C) in two groups of patients. In Group A, consisting of 80 low risk patients selected from the antenatal clinic, the acoustic stimulation resulted in a good response with no perinatal death. In Group B, consisting of 80 high risk patients, only 15 patients (18.7%) showed no response. In these 15 patients, there were two stillbirths and two neonatal deaths. Thirteen of these 15 patients were small for gestational age compared to only eight out of 61 who showed good response to the stimulus. This difference and the findings are statistically significant. Ann Saudi Med 1993;13(4) 328-331. HS Jamal, TS Jamal, Vibroacoustic Stimulation -Does it Really Help?. 1993; 13(4): 328-331 The problem of antepartum fetal distress and fetal loss looms large in modern obstetrics. In this regard, numerous tests have been described and used in the current obstetric practice such as fetal activity, fetal heart rate changes, and even breathing movements [1,2]. However, problems still face the clinician when he uses these methods because fetuses have substantial reserve mechanisms. Therefore, any test performed in the resting state may only have a limited predictive value. So it may be of more clinical value to try to assess the reserve mechanisms of the fetus by stimulating them and observing the response in fetal heart rate and fetal movement [3][4][5]. The aim of this study is to measure the antenatal fetal heart rate changes after vibroacoustic stimulus in normal and high risk pregnancies. Also it aims to evaluate the fetal outcome in low risk and high risk groups according to their response to the stimulus. Patients and MethodsThe study was carried out at King Abdulaziz University Hospital, Jeddah, over a period of one year from September 1990 -September 1991. Two groups of patients were elected.Group A: (n=80). This group consisted of 80 normal antenatal patients with no complications during their pregnancies and their pregnancies were greater than 36 weeks' gestation. They were studied to establish the normal fetal response to vibrotactile stimulation and to see the outcome according to their response.Group B: (n=80). This group consisted of high risk patients selected from the antenatal clinic with different risk factors (hypertension, intrauterine growth retardation, diabetes, etc) ( Figure 1). Their gestational ages were beyond 36 weeks. They were studied prospectively, measuring the fetal heart rate (FHR) changes following a single vibroacoustic stimulus by Artificial Electronic Larynx Model 5C (Western Electric, New York, NY, USA).The stimulus was applied to the maternal abdomen overlying the fetal head for a period of five seconds (sound pressure level averaged 82 dB). The fetal heart rate was recorded by cardiotocography machine.The response t...

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“…If no quantifying accelerations were noted, the stimulus was repeated at 1 minute interval for maximum three times and recording was done for 5 minutes. Interpretation of VAST was done according to Ingemarrson et al 1988. 3 All patients were carefully followed till delivery to find out the pregnancy outcome. Parameters like meconium staining of liquor, fetal distress during labor, mode of delivery, Apgar score, NICU admission and perinatal mortality were recorded.…”

Section: Methodsmentioning

confidence: 99%

Intrapartum Vibroacoustic Stimulation Test and Cardiotocography for the Prediction of Neonatal Outcome

Bano¹,

Nasreen²,

Kavitha³

2012

Journal of South Asian Federation of Obstetrics and Gynaecology

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Objectives: To evaluate the role of intrapartum vibroacoustic stimulation (VAST) and cardiotocography (CTG) for the prediction of neonatal outcome. Materials and methods:One hundred and twenty-five patients in labor with cephalic presentation were selected and subjected to CTG and VAST was done further to find out whether fetus is reactive or nonreactive and findings were correlated with the fetal outcome.Results: VAST is a good predictor of fetal well being. It is less time consuming, inexpensive and technically easy to perform. In developing countries, where fetal scalp blood sampling is not available in all institutions, VAST can effectively be used as a clinical tool to compliment abnormal CTG traces for better prediction of fetal outcome.

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Fetal acoustic stimulation in early labor in patients screened with the admission test

Cited by 53 publications

References 9 publications

Effect of Maternal Stress on Fetal Heart Rate Assessed by Vibroacoustic Stimulation

Effect of Maternal Stress on Fetal Heart Rate Assessed by Vibroacoustic Stimulation

Vibroacoustic Stimulation - Does it Really Help?

Intrapartum Vibroacoustic Stimulation Test and Cardiotocography for the Prediction of Neonatal Outcome

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