Continuous gastric suction or drainage causes which of the following clinical conditions?

BHU NO - 12 April 2024

Medical Surgical Nursing

Medium

Appeared in: BHU NO - 12 April 2024

Explanation

Continuous gastric suction removes stomach contents, which are highly acidic due to the presence of hydrochloric acid (HCl).
The removal of HCl leads to a significant loss of hydrogen ions (H⁺) from the body.
This loss of acid causes a relative increase in the concentration of bicarbonate (HCO₃⁻), a base, in the blood.
An elevated bicarbonate level and the resulting increase in blood pH define the condition of metabolic alkalosis.

Option A: Metabolic acidosis results from an excess of acid or a loss of base. Gastric suction removes acid, causing the opposite condition (alkalosis).
Option B: Hyperkalemia is an elevated level of potassium in the blood. Gastric fluid contains potassium, so its continuous removal leads to potassium loss and hypokalemia (low potassium).
Option D: Hypernatremia is an elevated sodium level, often due to dehydration (water loss greater than sodium loss). Gastric suction removes both water and sodium, which typically leads to hyponatremia or a normal sodium level, not hypernatremia.

Clinical Relevance

Nursing practice connection: Knowing Acid-Base Imbalance from Gastric Suction helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must diligently monitor patients with continuous gastric suction for signs and symptoms of metabolic alkalosis, such as confusion, muscle twitching, tingling in the fingers and toes, and dizziness.
It is a critical nursing responsibility to monitor laboratory values, including arterial blood gases (ABGs) and serum electrolytes (especially potassium, chloride, and sodium), to detect and manage imbalances early.
What if? If the patient was experiencing severe, prolonged diarrhea instead of gastric suction, the primary acid-base imbalance to anticipate would be metabolic acidosis, due to the significant loss of bicarbonate from the intestines.

How to Approach the Question

First, identify the key procedure in the question: 'continuous gastric suction'.
Next, recall the nature of the fluid being removed. Gastric fluid is highly acidic because it contains hydrochloric acid (HCl).
Analyze the physiological effect of removing this acidic fluid. Removing a large amount of acid from the body will make the blood more alkaline (basic).
Evaluate the options based on this analysis. 'Metabolic alkalosis' is the correct term for a state of increased alkalinity caused by a metabolic process.
Eliminate the incorrect options. Metabolic acidosis is the opposite effect. Hyperkalemia and hypernatremia are incorrect because suction removes electrolytes, leading to 'hypo-' states (hypokalemia, hyponatremia), not 'hyper-' states.

Concept Tested & Keywords

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