Which of the following drugs should be withheld before hemodialysis?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2019

Medical Surgical Nursing

Medium

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2019

Explanation

Antihypertensives are withheld before hemodialysis to prevent a sharp drop in blood pressure, a common complication called intradialytic hypotension.
The primary mechanism of hemodialysis involves ultrafiltration, which removes a significant volume of fluid from the blood, inherently lowering blood pressure.
The synergistic effect of an antihypertensive drug and dialysis-induced fluid removal can cause severe hypotension, leading to symptoms like dizziness, nausea, muscle cramps, and potentially shock.
This is a standard safety protocol in all dialysis units to protect the patient from hemodynamic instability during treatment.

Option A: Insulin is not routinely withheld. While the dose may be adjusted due to altered metabolism in renal failure, withholding it could lead to hyperglycemia.
Option B: Calcium preparations are often administered, not withheld. Patients with end-stage kidney disease frequently have hypocalcemia and hyperphosphatemia, and calcium supplements or phosphate binders containing calcium are part of their treatment.
Option C: Digoxin is not withheld because it is not significantly cleared from the blood by hemodialysis. The dose is typically given as scheduled.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Medication management for patients undergoing hemodialysis as background academic context rather than a clinical decision trigger.
Nurses are responsible for medication reconciliation before each dialysis session, ensuring that antihypertensives and other dialyzable drugs are held according to unit protocol to maintain patient safety.
Patient education is a key nursing role. The nurse must clearly explain to the patient and family why holding blood pressure medication on dialysis days is crucial and when it is safe to resume taking it.
During dialysis, nurses must vigilantly monitor the patient's blood pressure and watch for signs of hypotension, being prepared to intervene by reducing the ultrafiltration rate or administering saline as ordered.

How to Approach the Question

First, identify the core physiological process of the procedure mentioned in the question: Hemodialysis removes excess fluid and waste products from the blood.
Recognize the primary and most common side effect of this rapid fluid removal: a decrease in blood pressure.
Evaluate each medication option based on its primary pharmacological action and how it would interact with this known side effect.
An antihypertensive drug's purpose is to lower blood pressure. Giving this drug before a procedure that also lowers blood pressure creates a synergistic effect and a significant safety risk.
Consider the other options: Insulin affects blood sugar, calcium affects mineral balance, and digoxin affects heart contractility. None of these have a primary effect of lowering blood pressure, making them less likely to be routinely withheld for that reason.

Concept Tested & Keywords

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