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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The correct answer is choice A. The client reports a decrease in nausea and vomiting.
This indicates that the treatment has been effective in reducing the symptoms of hyperemesis gravidarum and improving the quality of life of the client.
Choice B is wrong because weight gain alone is not a reliable indicator of treatment effectiveness.
Weight gain may be due to fluid retention or other factors unrelated to nausea and vomiting.
Choice C is wrong because urine specific gravity of 1.035 is high and indicates dehydration, which is a complication of hyperemesis gravidarum.
The normal range of urine specific gravity is 1.005 to 1.0302.
Choice D is wrong because hematocrit of 38% is within the normal range for pregnant women (33 to 39%) and does not reflect the severity or improvement of hyperemesis gravidarum.
Correct Answer is B
Explanation
This change alters the center of gravity and posture of the body because the uterus expands and shifts higher as the fetus grows during pregnancy.
This causes an increased strain on the muscles and ligaments supporting the vertebral column and leads to lower back pain.
Choice A is wrong because increased joint laxity does not alter the center of gravity and posture of the body.
It is caused by hormonal changes that loosen the ligaments throughout the body, resulting in decreased stability of the joints.
Choice C is wrong because increased muscle strain does not alter the center of gravity and posture of the body.
It is a consequence of the shift in the center of gravity and the weight gain during pregnancy, which put more pressure on the back muscles.
Choice D is wrong because decreased muscle strength does not alter the center of gravity and posture of the body.
It is not a common musculoskeletal change during pregnancy, although some women may experience fatigue or weakness due to hormonal changes or anemia.
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