Peds final

Question 1

What is short and long term variability

Answer 1

Short term variability – 3-6 bpm; CNS depressants reduce this short-term variability

Long term variability – characterized by periodic accelerations correlating with fetal movements normally 15-40 accelerations per hour. Decreases seen with fetal sleep.

Absence of short and long term variability may indicate fetal distress.

Question 2

Early, variable, and late decelerations

Answer 2

Early - head compression

Late – Uteroplacental insufficiency. Decreased O2 supply, combined with lack of short-term variability is ominous for fetal distress.

Variable - related to cord compression, associated with fetal asphyxia when they are greater than 70 bpm, longer than 60 sec, or occur in a pattern persisting for more than 30 min.

Question 3

Normal FETAL ph

Answer 3

pH: 7.25-7.35 (mean 7.33)
pCO2: 40-50 mmHg
pO2: 20-30 mmHg
Base: <10