Pt has respiratory acidosis (low blood pH) due to his asthma exacerbation. What will the nurse expect to see?
No change in affinity of hemoglobin with oxygen
Decrease in affinity of hemoglobin with oxygen
Increase in affinity of hemoglobin with oxygen
Decrease in blood CO2
The Correct Answer is B
Choice A reason: Respiratory acidosis does not cause no change in affinity of hemoglobin with oxygen. It causes a decrease in affinity of hemoglobin with oxygen, which means that hemoglobin releases more oxygen to the tissues. This is known as the Bohr effect, which is a physiological response to low pH and high CO2 levels.
Choice B reason: Respiratory acidosis causes a decrease in affinity of hemoglobin with oxygen, which means that hemoglobin releases more oxygen to the tissues. This is the correct statement that describes the expected finding in this patient. The decrease in affinity of hemoglobin with oxygen is a compensatory mechanism that tries to restore the oxygen balance in the body.
Choice C reason: Respiratory acidosis does not cause an increase in affinity of hemoglobin with oxygen. It causes a decrease in affinity of hemoglobin with oxygen, which means that hemoglobin releases more oxygen to the tissues. An increase in affinity of hemoglobin with oxygen would mean that hemoglobin holds on to oxygen more tightly, which would worsen the hypoxia in the patient.
Choice D reason: Respiratory acidosis does not cause a decrease in blood CO2. It causes an increase in blood CO2, which is the primary cause of the low pH. A decrease in blood CO2 would indicate respiratory alkalosis, which is a condition of high pH and low CO2 levels.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: This is not a physiological response to hydralazine. Cool extremities are a sign of poor peripheral perfusion, which can be caused by vasoconstriction, not vasodilation.
Choice B reason: This is not a physiological response to hydralazine. Increased urinary output is a sign of diuresis, which can be caused by diuretic medications, not vasodilators.
Choice C reason: This is not a physiological response to hydralazine. Pale skin is a sign of reduced blood flow to the skin, which can be caused by vasoconstriction, not vasodilation.
Choice D reason: This is a physiological response to hydralazine. Reflex tachycardia is a compensatory mechanism that occurs when the blood pressure drops due to vasodilation. The heart rate increases to maintain the cardiac output and perfusion pressure.
Correct Answer is D
Explanation
Choice A reason: Decreased cardiac output would result in a decrease in blood pressure, not an increase. Cardiac output is the amount of blood pumped by the heart per minute.
Choice B reason: Decreased vascular resistance would also result in a decrease in blood pressure, not an increase. Vascular resistance is the force that opposes the blood flow in the blood vessels.
Choice C reason: Hypovolemia would also result in a decrease in blood pressure, not an increase. Hypovolemia is the condition of having low blood volume due to fluid loss or dehydration.
Choice D reason: Vasoconstriction would result in an increase in blood pressure. Vasoconstriction is the narrowing of the blood vessels, which increases the vascular resistance and the blood pressure.
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