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Fetal heart rate is continuously monitored for slow or abnormal heart rate patterns which may indicate fetal distress during labor. [7] If the exposed blood vessels are near the cervix or are at risk of rupturing, the newborn may be delivered via caesarean section as early as 35 weeks gestation.
The 80% of MoDi pregnancies without TTTS still have high rates of birth weight discordance, fetal growth restriction, prematurity and resultant cesarean section deliveries. [1] One twin may also fail to develop a proper heart and become dependent on the pumping activity of the other twin's heart, resulting in twin reversed arterial perfusion. [2]
Generally, the pump twin is structurally normal, although it is smaller than normal. [2] Due to related problems including the rapid growth of the acardiac twin, polyhydramnios, umbilical cord entanglement and congestive heart failure due to high output, there is a high mortality rate for the pump twin if left untreated.
The term is also sometimes used to designate late decelerations of fetal heart rate as measured by cardiotocography or an NST, even if there is no other evidence of reduced blood flow to the placenta, normal uterine blood flow rate being 600mL/min.
A normal nonstress test will show a baseline fetal heart rate between 110 and 160 beats per minute with moderate variability (5- to 25-interbeat variability) and 2 qualifying accelerations in 20 minutes with no decelerations. "Reactive" is defined as the presence of two or more fetal heart rate accelerations within a 20-minute period. Each ...
A Zigzag pattern of fetal heart rate (FHR) is defined as FHR baseline amplitude changes of more than 25 beats per minute (bpm) with a minimum duration of 2 minutes and maximum of 30 minutes. [19] However, according to another study, even a >1 min duration of the zigzag pattern is associated with an increased risk of adverse neonatal outcomes. [21]
Her heart rate began to climb and soon Ezra's followed. "They had always said that the twins would let us know when it was time to go," she said. Ezra's heart rate told them that at 26 weeks ...
The heart rate increases, but generally not above 100 beats/ minute. Total systematic vascular resistance decreases by 20% secondary to the vasodilatory effect of progesterone. Overall, the systolic and diastolic blood pressure drops 10–15 mm Hg in the first trimester and then returns to baseline in the second half of pregnancy. [ 6 ]