. A patient with central diabetes insipidus is being treated with desmopressin (DDAVP) and fluid replacement. Which of the following lab values should the nurse monitor closely?
Serum sodium levels
Serum magnesium levels
Serum potassium levels
Serum calcium levels
The Correct Answer is A
A. Serum sodium levels: Desmopressin can lead to water retention and potentially hyponatremia. Monitoring serum sodium is crucial to prevent electrolyte imbalance.
B. Serum magnesium levels: Magnesium is not typically impacted by desmopressin treatment in central diabetes insipidus.
C. Serum potassium levels: Desmopressin does not generally affect potassium levels in patients with diabetes insipidus.
D. Serum calcium levels: Calcium levels are not directly influenced by desmopressin or diabetes insipidus.
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Correct Answer is B
Explanation
A. The glomerular filtration rate decreases because there is a reduction of blood flow to the kidneys. Reduced blood flow to the kidneys, or renal hypoperfusion, decreases the glomerular filtration rate (GFR) because less blood is being filtered through the kidneys. This can occur in conditions such as shock, severe dehydration, or heart failure, but it is not the primary mechanism in acute tubular necrosis (ATN).
B. The glomerular filtration rate decreases because there is injury to the renal tubular cells. In ATN, the injury to renal tubular cells impairs their function, leading to reduced reabsorption and filtration ability, which contributes to the decrease in GFR.
C. The glomerular filtration rate decreases because inflammatory cells invade the already damaged kidneys. While inflammation may be present, it is not the primary cause of decreased GFR in acute tubular necrosis; reduced blood flow and tubular cell injury are more direct causes.
D. The glomerular filtration rate decreases because there is obstruction leading to the filtration system backing up and eventually shutting the kidneys down. Obstruction is not typically a characteristic of acute tubular necrosis; ATN is usually caused by ischemic or toxic injury, not physical obstruction.
Correct Answer is A
Explanation
A. Use written communication or visual aids to supplement verbal instructions. Written communication and visual aids are effective ways to enhance understanding and provide clear instructions to a patient with hearing loss.
B. Speak loudly and directly into the patient's ear. Speaking loudly can distort sounds and may make it harder for the patient to understand. Instead, clear and slow speech with normal volume is recommended.
C. Turn off all background noise and speak to the patient from behind. While reducing background noise is beneficial, speaking from behind is ineffective as the patient cannot see the nurse’s facial expressions or read lips.
D. Assume the patient can read lips and avoid using sign language or gestures. Assuming the patient can read lips is not appropriate; gestures or other visual aids should be used to enhance communication.