What is severe acute malnutrition (SAM)?

Appeared in: UP NHM CHO 7 Sept 2022 (Shift-2)

Explanation

Severe Acute Malnutrition (SAM) is defined by a weight-for-height Z-score that is less than -3 standard deviations from the median of the WHO Child Growth Standards.
This criterion indicates severe wasting, which is a life-threatening condition.
Other independent diagnostic criteria for SAM include a mid-upper arm circumference (MUAC) of less than 115 mm or the presence of bilateral pitting edema.
A child only needs to meet one of these three criteria to be classified as having SAM.

Option A: This range defines Moderate Acute Malnutrition (MAM), which is less severe than SAM.
Option B: This is an incorrect range. A Z-score greater than -3 includes children with moderate malnutrition and even those with normal nutritional status, not just severe.
Option C: This range indicates a normal or only mildly malnourished state. It is well above the threshold for severe malnutrition.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of Severe Acute Malnutrition (SAM) using WHO growth standards as background academic context rather than a clinical decision trigger.
Early and accurate identification of SAM is critical for nurses as it is a medical emergency with a high mortality rate if left untreated.
Nurses use the WHO criteria (WHZ, MUAC, edema) for screening, diagnosis, and monitoring response to treatment in community and facility settings.
Management of SAM requires a specialized, phased approach (stabilization, transition, rehabilitation) with specific therapeutic foods (F-75, F-100, RUTF) and careful medical monitoring to prevent complications like hypoglycemia, hypothermia, and refeeding syndrome.

How to Approach the Question

First, identify the key terms in the question: 'Severe Acute Malnutrition (SAM)' and 'Weight-for-height Z score'.
This is a factual recall question that requires knowledge of specific diagnostic criteria from public health guidelines (WHO).
Recall the specific cut-off values for different levels of malnutrition. The key number to remember for 'severe' is -3 SD.
Analyze the options based on this knowledge. 'Less than -3' (< -3) correctly identifies the threshold for SAM.
Eliminate the other options by identifying what they represent: 'between -2 and -3' is MAM, and 'greater than -2' is normal/mild.
Confirm your answer by remembering that SAM represents the most extreme end of the malnutrition spectrum.

Concept Tested & Keywords

Concept Tested: Definition of Severe Acute Malnutrition (SAM) using WHO growth standards.
Stem keywords: severe acute malnutrition, SAM, weight-for-height, Z score
Lead-in keywords: What is
Negative lead-in flag: false

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E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 177-179

E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 439-441

Practise the full UP NHM CHO 7 Sept 2022 (Shift-2)

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