What is the condition known as when there is a lack of sodium in the body?

Appeared in: CIP Ranchi 2023

Explanation

Hyponatremia is the correct medical term for a deficiency of sodium in the blood.
It is clinically defined as a serum sodium concentration of less than 135 mEq/L.
The term is derived from Greek and Latin roots: 'hypo' (under/low), 'natrium' (sodium), and 'emia' (in the blood).
This condition can result from either an actual loss of sodium from the body or a relative loss due to an excess of body water (dilutional hyponatremia).

Option A: Hypernatremia refers to an excess of sodium in the blood, not a lack of it.
Option C: Hypokalemia refers to a deficiency of potassium in the blood, not sodium.
Option D: Hypomataemia is not a recognized medical term. It is designed to be a plausible-sounding but incorrect option.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Electrolyte Imbalances: Sodium Regulation as background academic context rather than a clinical decision trigger.
Nurses must closely monitor patients at risk for hyponatremia, such as those on diuretics, with heart failure, or with gastrointestinal losses. Key assessments include monitoring vital signs, daily weights, intake/output, and neurological status.
Patient safety is a major concern, as severe hyponatremia can lead to cerebral edema, seizures, and coma. Implementing seizure precautions for at-risk patients is a critical nursing intervention.
What if? If a patient with hyponatremia suddenly becomes confused and has a seizure, this signifies a medical emergency. The priority nursing action is to ensure patient safety (protecting the airway and from injury), call for immediate medical assistance, and prepare for the administration of intravenous hypertonic saline.

How to Approach the Question

First, identify the key phrase in the question: 'lack of sodium'.
Next, break down the medical terminology in the options. The prefix 'hypo-' means 'low' or 'under', while 'hyper-' means 'high' or 'excessive'.
Recognize the root word for sodium, which is 'natr' (from the Latin 'natrium'). The root for potassium is 'kal' (from the Latin 'kalium').
Combine the prefix and root: 'Hypo-' + 'natr-' + '-emia' (in the blood) directly translates to 'low sodium in the blood'.
Evaluate the other options: 'Hypernatremia' means high sodium, and 'Hypokalemia' means low potassium. 'Hypomataemia' is not a standard term, making it an invalid choice.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 769-771

E6 Pharmacology Nursing Lilley 11e Part 2 p. 166-168

E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 2 — Subpart A (pp 1-239 of 478) p. 93-95

Practise the full CIP Ranchi 2023

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