In a patient with Hepatic Encephalopathy, if the ammonia level is increasing, what treatment should be given to the patient to control it?

Appeared in: Uttarakhand CHO - 2021

Explanation

Lactulose is the first-line treatment for hepatic encephalopathy (HE).
It is a non-absorbable disaccharide that reduces ammonia levels in the blood.
Its mechanism involves acidifying the colon, which converts ammonia (NH₃) to ammonium (NH₄⁺).
Ammonium is trapped in the gut and cannot be reabsorbed into the bloodstream.
Lactulose also acts as a laxative, promoting the excretion of the trapped ammonium in the stool, thereby lowering systemic ammonia levels.

Option B: Allopurinol is used to treat gout and hyperuricemia. It works by inhibiting xanthine oxidase, an enzyme required for uric acid production. It has no effect on ammonia levels.
Option C: Desferoxamine is an iron-chelating agent. It is used to treat acute iron poisoning or chronic iron overload (hemochromatosis). It binds with iron in the bloodstream and enhances its elimination.
Option D: Insulin's primary function is to regulate blood glucose by facilitating its entry into cells. It is the cornerstone of treatment for Type 1 Diabetes and is also used in Type 2 Diabetes.

Clinical Relevance

Nursing practice connection: Use the key finding related to Pharmacological management of hepatic encephalopathy to guide bedside assessment, documentation, and the next nursing action.
The primary nursing goal when administering lactulose for HE is to titrate the dose to achieve 2-3 soft stools per day. This indicates the medication is working effectively to remove ammonia.
Nurses must closely monitor for adverse effects such as excessive diarrhea, which can lead to dehydration, hypokalemia, and hypernatremia. These electrolyte imbalances can worsen the patient's encephalopathy.
A key assessment parameter is the patient's neurological status. Improvement in orientation, reduction in confusion, and resolution of asterixis ('liver flap') are positive indicators of treatment success.

How to Approach the Question

First, identify the patient's diagnosis from the question stem: 'Hepatic Encephalopathy'.
Next, identify the specific problem to be addressed: 'ammonia level is increasing'.
The question asks for the correct 'treatment'. This requires recalling the first-line pharmacological agent for managing hyperammonemia in the context of hepatic encephalopathy.
Evaluate each option based on its known primary indication.
Lactulose is specifically indicated for this purpose. The other options (Allopurinol, Desferoxamine, Insulin) are for different conditions (gout, iron overload, diabetes).
Select the option that directly addresses the pathophysiology of hyperammonemia in liver disease.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 2 p. 621-623

E6 Nutrition Kumud Khanna 2e p. 279-281

Practise the full Uttarakhand CHO - 2021

Attempt every question from this paper in a timed mock, then review the full solution for each one.