TY - JOUR
T1 - V-shaped deceleration differs in the pattern of carotid blood flow from variable deceleration provoked by cord compression
AU - Yasui, Tomoharu
AU - Kimura, Yoshitaka
AU - Murotsuki, Jun
AU - Watanabe, Takanori
AU - Koshino, Takahiro
AU - Okamura, Kunihiro
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
KW - Carotid artery blood flow
KW - Fetal heart rate monitoring
KW - V-shaped deceleration
KW - Variable deceleration
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U2 - 10.1515/JPM.2002.036
DO - 10.1515/JPM.2002.036
M3 - Article
C2 - 12122909
AN - SCOPUS:0036080853
VL - 30
SP - 257
EP - 264
JO - Journal of Perinatal Medicine
JF - Journal of Perinatal Medicine
SN - 0300-5577
IS - 3
ER -