![]() ![]() The monitor calculates and records the FHR on a continuous strip of paper. The transducer uses Doppler ultrasound to detect fetal heart motion and is connected to an FHR monitor. It may also be performed using an external transducer, which is placed on the maternal abdomen and held in place by an elastic belt or girdle. External monitoring is performed using a hand-held Doppler ultrasound probe to auscultate and count the FHR during a uterine contraction and for 30 seconds thereafter to identify fetal response. Differentiating between a reassuring and nonreassuring fetal heart rate pattern is the essence of accurate interpretation, which is essential to guide appropriate triage decisions.Īuscultation of the fetal heart rate (FHR) is performed by external or internal means. Ominous patterns require emergency intrauterine fetal resuscitation and immediate delivery. Nonreassuring patterns such as fetal tachycardia, bradycardia and late decelerations with good short-term variability require intervention to rule out fetal acidosis. Fetal heart rate patterns are classified as reassuring, nonreassuring or ominous. The fetal heart rate undergoes constant and minute adjustments in response to the fetal environment and stimuli. ![]() Since variable and inconsistent interpretation of fetal heart rate tracings may affect management, a systematic approach to interpreting the patterns is important. Although detection of fetal compromise is one benefit of fetal monitoring, there are also risks, including false-positive tests that may result in unnecessary surgical intervention. Electronic fetal heart rate monitoring is commonly used to assess fetal well-being during labor.
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