What arterial blood gas result is expected when a person experiences prolonged nasogastric suctioning?
pH 7.50, PaCO2 44 mm Hg, HCO3 28 mEq/L
pH 7.34, PaCO2 45 mm Hg, HCO3 21 mEq/L
pH 7.32, PaCO2 49 mm Hg, HCO3 26 mEq/L
pH 7.46, PaCO2 29 mm Hg, HCO3 25 mEq/L
The Correct Answer is A
Choice A reason: Prolonged nasogastric suctioning removes gastric acid (HCl), reducing hydrogen ions in the blood, leading to metabolic alkalosis. This is reflected by elevated pH (7.50) and increased HCO3 (28 mEq/L), with normal PaCO2 as the lungs have not yet compensated. This matches the expected acid-base imbalance, making it correct.
Choice B reason: This result shows a slightly acidic pH (7.34) with normal PaCO2 and low HCO3, suggesting metabolic acidosis. Nasogastric suctioning causes loss of acid, not base, so it does not lead to acidosis. This imbalance is inconsistent with the alkalosis expected from gastric acid loss, making it incorrect.
Choice C reason: This result indicates a low pH (7.32) and elevated PaCO2, suggesting respiratory acidosis with partial compensation (normal HCO3). Nasogastric suctioning affects gastric acid, causing metabolic, not respiratory, alkalosis. The respiratory parameters here do not align with the condition’s pathophysiology, making this choice incorrect.
Choice D reason: This result shows an elevated pH (7.46) and low PaCO2, indicating respiratory alkalosis, likely from hyperventilation, with normal HCO3. Nasogastric suctioning causes metabolic alkalosis due to acid loss, not respiratory changes. The low PaCO2 does not fit the expected metabolic profile, making this choice incorrect.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Taking showers instead of baths reduces urinary tract infection risk by avoiding prolonged exposure to bacteria in bathwater. Showers minimize contamination of the urethral area, making this choice incorrect for increasing UTI risk.
Choice B reason: Drinking 8 cups of liquid daily promotes urine production, flushing bacteria from the urinary tract, reducing infection risk. Adequate hydration supports urinary system health, making this choice incorrect for increasing UTI risk.
Choice C reason: Wiping from back to front introduces fecal bacteria, like E. coli, to the urethra, increasing the risk of urinary tract infections. This improper hygiene practice facilitates bacterial entry, making this the correct choice.
Choice D reason: Emptying the bladder regularly and completely prevents urine stasis, which reduces bacterial growth and infection risk. Regular voiding flushes pathogens from the urethra, making this choice incorrect for increasing UTI risk.
Correct Answer is {"A":{"answers":"A"},"B":{"answers":"B"},"C":{"answers":"B"},"D":{"answers":"A"},"E":{"answers":"B"},"F":{"answers":"B"}}
Explanation
A. Hernia causes mechanical bowel obstruction by physically trapping or compressing the intestine, preventing content passage. This aligns with the patient’s hernia, creating a structural blockage consistent with clinical findings.
B. Hypokalemia leads to functional bowel obstruction by disrupting intestinal motility through electrolyte imbalances, impairing muscle contractions without physical blockage. This matches the patient’s hypokalemia, exacerbating adynamic ileus.
C. Anesthesia from surgery causes functional bowel obstruction by slowing intestinal peristalsis, often resulting in postoperative ileus. This aligns with the patient’s recent anesthesia exposure, disrupting coordinated muscle contractions.
D. Intestinal tumor results in mechanical bowel obstruction by physically blocking or compressing the intestinal lumen, impeding content flow. The patient’s tumor aligns with this mechanism, a common cause of mechanical obstruction.
E. Pancreatitis contributes to functional bowel obstruction by causing inflammation or retroperitoneal irritation, leading to adynamic ileus without physical blockage. This matches the patient’s pancreatitis, disrupting intestinal motility.
F. Adhesions cause mechanical bowel obstruction by forming fibrous bands that kink or compress the intestine, blocking content passage. The patient’s adhesion history aligns with this, a leading cause of small bowel obstruction
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