V-shaped deceleration differs in the pattern of carotid blood flow from variable deceleration provoked by cord compression
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T. Yasui
Abstract
Objective: To investigate whether V-shaped decelerations in fetal heart rate tracing are a physiologic response to fetal movements or secondary to cord compression.
Study design: Six pregnant sheep and their fetuses (115–125 days of gestation) were surgically instrumented and studied. Fetal electrocardiogram, carotid blood flow, arterial blood pressure and fetal movement were continuously monitored for 24 hours. Following the undisturbed 24 hour recording, these parameters were monitored during umbilical cord compression (n = 6). Differences in these parameters between V-shaped decelerations and decelerations provoked by cord compressions were examined.
Results: Elevation of blood pressure and decreased carotid blood flow were observed coincidentally with the initiation of V-shaped decelerations. In cord compression, elevation of both blood pressure and carotid blood flow were followed by a decreased heart rate. V-shaped decelerations exhibited a different alteration of carotid blood flow compared to decelerations caused by umbilical cord compression.
Conclusion: V-shaped deceleration is a physiologic response secondary mainly to fetal movements and is not caused by cord compression.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Cutaneous and subcutaneous infections in newborns due to anaerobic bacteria
- Repeated prenatal corticosteroids reduce glial fibrillary acidic protein in the ovine central nervous system
- Are intrapartum and neonatal deaths in breech delivery at term potentially avoidable? – A blinded controlled audit
- A comparison of clinical variables that predict adverse outcome in term infants with severe respiratory failure randomised to a policy of extracorporeal membrane oxygenation or to conventional neonatal intensive care
- Experience with first level ultrasound and echocardiography for a selected and an unselected population
- Fetal superior mesenteric artery blood flow velocimetry in normal and high-risk pregnancy
- The midwife factor in obstetric procedures and neonatal outcome
- Cerebral intracellular calcium concentrations in asphyxiated rat fetuses resuscitated with oxygen
- V-shaped deceleration differs in the pattern of carotid blood flow from variable deceleration provoked by cord compression
- Sudden intractable respiratory failure in extremely low birth weight infants with H-type tracheoesophageal fistula
- Neuropathological features of the brain in acardius acormus
- Transient postpartum diabetes insipidus in twin pregnancy associated with HELLP syndrome
- Congress Calendar
- WAPM-Newsletter No 1/2002
