Ultrasound Imaging and Pulsed Wave Doppler Stimulus Fetal Reflex Action Test

作者：Amir Samreen^*; Chowdhry Bhawany Shankar

来源：Journal of Medical Imaging and Health Informatics, 2015, 5(8): 1771-1776.

DOI：10.1166/jmihi.2015.1643

• Controlled Fetal Movements
• PWD
• Fetal Reflex Action
• Thalamus

To confirm that a pulsed wave Doppler (PWD) ultrasound from a diagnostic imaging system can be used to motivate controlled fetal movements, defined as responsive movement of the fetus' head in response to excitation. Fifteen low-risk singleton fetuses (30-36 weeks) were evaluated under two conditions: exposure to B-mode ultrasound, and exposure to pulsed wave Doppler ultrasound with B-modes. The effects of PWD are evaluated by minimizing all factors which could aid fetal body movement. Fetuses in fasting patients with slightly decreased amniotic fluid (AFI mean +/- SD, 8.1 +/- 1.4) were chosen as test subjects. An initial rest period consisted of one or fewer movements. The thalamus (inner ear) was stimulated with trials of ten seconds each. Two trials were conducted on each side of the (Biparietal diameter) BPD were performed. Results were compared by using the Wilcoxon signed rank test. Results demonstrated that fetus movement was directionally opposite to the stimulus under PWD with B-modes, showing a greater fetal heart rate (FHR) difference (-8.5 +/- 4.9 bpm; p-value = 0.0002) than under B-mode exposure alone (0.4 +/- 1.7 bpm). The p-value is 0.0002 for condition 2. FHR decreased after the introduction of the stimulus. PWD ultrasound may stimulate controlled fetal head movements as a result of reflex action.

• 出版日期2015-12