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
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 C
Explanation
Increased renal blood flow is responsible for the increased urinary output during pregnancy.
This is because the renal plasma flow and glomerular filtration rate increase by 50% to 80% during pregnancy, resulting in more urine production.
Choice A is wrong because the glomerular filtration rate increases, not decreases, during pregnancy.
Choice B is wrong because the tubular reabsorption decreases, not increases, during pregnancy.
This is due to the increased levels of progesterone, which inhibit sodium reabsorption and cause diuresis.
Choice D is wrong because the increased plasma volume is a consequence, not a cause, of the increased renal blood flow.
The plasma volume expands by 30% to 50% during pregnancy to meet the increased metabolic demands of the mother and fetus.
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