Which of the following positions would be least effective when ...

[Yi-Chen]

Which of the following positions would be least effective when gravity is desired to assist in fetal descent?
 
  1. Lithotomy
  2. Kneeling
  3. Sitting
  4. Walking

Question 2

An infant at 36 weeks of gestation has increasing respirations (80-100 breaths per minute with marked substernal retractions). The infant is given oxygen by nasal continuous positive airway pressure (CPAP).
 
  Which of the following arterial oxygen levels would indicate hy-poxia? 1. PaO2 of 67
  2. PaO2 of 89
  3. PaO2 of 45
  4. PaO2 of 73

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Answer to Question 1

1
1. Correct. The predominant position in the United States for physician-attended births is the lithotomy position. This position requires a woman to be in a reclined position with her legs in stirrups. Gravity has little effect in this position.
2, 3, 4. Incorrect. Kneeling, sitting, and walking help to align the fetus with the pelvic outlet and allow for gravity to assist in fetal descent.

Answer to Question 2

3
1, 2, 4. Incorrect. The normal range for PaO2 for the neonate is 60 to 70 mm Hg. A lab value be-low this range would indicate hypoxia.
3. Correct. A PaO2 of 45 is below the normal range for a normal neonate. The range for arterial oxygen pressure is 60 to 70 mm Hg. The lab value of PaO2 of 45 indicates hypoxia in this infant.