A nurse is educating a pregnant client about the changes in her posture during pregnancy.
Which factor contributes to increased spinal curvature?
Increased joint laxity.
Increased weight gain.
Increased muscle strain.
Decreased muscle strength.
The Correct Answer is A
The correct answer is choice A. Increased joint laxity contributes to increased spinal curvature in pregnant women.
Joint laxity is caused by the hormone relaxin, which loosens the ligaments and joints of the pelvis and spine to prepare for childbirth.
This can result in increased lordosis (inward curvature) of the lumbar spine and increased kyphosis (outward curvature) of the thoracic spine.
Choice B is wrong because increased weight gain does not directly affect spinal curvature, but it can cause postural changes such as anterior pelvic tilt and forward trunk lean.
Choice C is wrong because increased muscle strain is a consequence, not a cause, of spinal curvature changes.
Muscle strain can occur due to the altered biomechanics and balance of the spine and pelvis during pregnancy.
Choice D is wrong because decreased muscle strength is also a consequence, not a cause, of spinal curvature changes.
Muscle strength can decrease due to reduced physical activity, hormonal changes, or pain during pregnancy.
Normal ranges for spinal curvature vary depending on age, sex, and measurement method, but generally they are:
Sacral inclination: 30-50 degrees
Lumbar curvature: 20-45 degrees
Thoracic curvature: 20-40 degrees
Cervical curvature: 20-35 degrees
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
Correct Answer is B
Explanation
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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