Ncc Efm (Exam Questions And Correct Detailed Answers) Breakdown & Study Guide

Non stress test (NST) {Ans: Can be done >26 wks -Reactive: 2 accels in 20 mins (can prolong to 40min) with moderate variability -Acoustic stim: ≤3, 1 min apart lasting 3 sec each (not used for oligo or <32 wks), elicits startle reflex -Valid for 24 hrs}Uteroplacental circulation {Ans: (R arrow indicates blood flow) -Uterine artery → spiral arterioles → intervillous space → diffusion to chorionic villi → oxygenated blood & nutrients to umbilical vein → fetal circulation -Opposite occurs to rid deoxygenated blood & waste from uterine artery -Trophoblasts allow diffusion from chorionic villi & intervillous space without mom & baby RBCs mixing}FHR Baseline {Ans: Average FHR rounded to nearest 5 during a 10 min window -110 to 160 -excludes accels, decels, & marked variability -must have 2 mins to identify as a baseline (doesn't need to be continuous)}Interpretation of BPP {Ans: -8 to 10 = reassuring (unless oligo) -6 = equivocal, repeat in 24 hrs (if pt is term then delivery is recommended) -4 = further testing needed}Maternal factors affecting fetal oxygenation {Ans: 1) ↓ maternal O2: respiratory distress, hypoventilation, seizures, trauma, smoking 2) ↓ maternal O2 carrying capacity: anemia, carboxihemoglobin (smoking, poisoning,