A nurse is calculating the partial pressure of oxygen (PaO2) in the arterial blood of a pregnant client who is in her second trimester.
The nurse should use which of the following values as the normal range for PaO2 in pregnancy?
27 to 32 mmHg.
95 to 105 mmHg.
500 to 700 mL.
7 to 10 L/mi.
The Correct Answer is B
95 to 105 mmHg.
This is the normal range for PaO2 in pregnancy according to several sources.
PaO2 is the partial pressure of oxygen in arterial blood and reflects the oxygenation of the blood.
It is influenced by factors such as ventilation, perfusion, diffusion, and hemoglobin affinity.
Choice A is wrong because 27 to 32 mmHg is too low for PaO2 and would indicate severe hypoxemia or low oxygen levels in the blood.
Choice C is wrong because 500 to 700 mL is a measure of tidal volume, not PaO.
Tidal volume is the amount of air that moves in and out of the lungs with each breath.
Choice D is wrong because 7 to 10 L/min is a measure of oxygen flow rate, not PaO.
Oxygen flow rate is the amount of oxygen delivered to a patient through a device such as a nasal cannula or a mask.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
This is because cramping and vaginal bleeding 24 hours after amniocentesis are signs of possible complications, such as injury to the baby or mother, leaking of amniotic fluid, infection, Rh sensitization, preterm labor, or miscarriage.
These complications are rare, but they can be serious and require immediate medical attention.
Choice B is wrong because administering pain medication to the patient does not address the underlying cause of the cramping and bleeding, and may delay seeking help.
Choice C is wrong because encouraging the patient to rest and elevate her legs may not prevent further complications, and may also delay seeking help.
Choice D is wrong because offering emotional support and reassurance to the patient is not enough to ensure the safety of the baby and the mother, and may give a false sense of security.
Normal ranges for amniocentesis are:
No chromosomal defects detected in the fetus and no abnormal proteins present in amniotic fluid
No signs of infection or other illness in the baby
Fetal lungs mature enough for birth if delivery is planned sooner than 39 weeks
Correct Answer is C
Explanation
Leg cramps are painful muscle contractions that typically affect the calf, foot or both.
They are common during pregnancy, often happening at night during the second and third trimesters.
While the exact cause of leg cramps during pregnancy isn’t clear, various theories point to the following causes of leg cramps during pregnancy: 2
Pregnancy fatigue from carrying the extra baby weight
Compression of the blood vessels in the legs
Diet (an excess of phosphorus and a shortage of calcium or magnesium)
Pregnancy hormones since they seem to cause so many pregnancy aches and pains
Choice A is wrong because increased joint laxity is not a cause of leg cramps, but rather a result of hormonal changes that relax the ligaments and joints in preparation for childbirth.
Choice B is wrong because increased spinal curvature is not a cause of leg cramps, but rather a result of the changing center of gravity and posture during pregnancy.
Choice D is wrong because decreased muscle strength is not a cause of leg cramps, but rather a consequence of muscle fatigue and weight gain during pregnancy.
Normal ranges for calcium are 8.5 to 10.2 mg/dL, for magnesium are 1.7 to 2.2 mg/dL, and for phosphorus are 2.5 to 4.5 mg/dL.
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