Diarrheal Disorders
General Medicine · Topic 16
Source: NMC CBME Curriculum 2024 · Volume II · General Medicine · Topic 16 · combined PDF page 307
Practice questions
- An infant develops persistent diarrhea during the first weeks of life, with evidence of nutrient malabsorption. Which diagnostic category should be considered?
- A neonate with a congenital diarrheal disorder has severe ongoing fluid and nutrient losses. Which form of nutritional support is frequently required in severe cases?
- A genetic defect impairs intestinal nutrient digestion, absorption, and transport. In the proposed classification of congenital diarrheal disorders, which group best fits this defect?
- A congenital diarrheal disorder is attributed to abnormal enterocyte differentiation and polarization. Which proposed classification group applies?
- A proposed congenital diarrheal disorder classification includes a group involving abnormal development of hormone-secreting intestinal cells. Which group is this?
- A congenital diarrheal syndrome is thought to result primarily from abnormal regulation of intestinal immune responses. Which classification group best describes it?
- Which gene is classically associated with microvillus inclusion disease in the supplied literature?
- Which inheritance pattern is stated for MYO5B-associated microvillus inclusion disease?
- In addition to MYO5B, mutations in which pair of genes have been associated with variants of the microvillus inclusion disease phenotype?
- What shared biological interpretation did the review propose for MYO5B, STX3, and STXBP2 in a subset of congenital diarrheal disorders?
- Which pair consists of enterocyte-associated congenital diarrheal disorders specifically named in the review of enterocyte defects?
- A clinician is evaluating an infant with severe early-onset chronic diarrhea and suspects an inherited enteropathy. Which diagnostic approach is most consistent with the reviews?
- In the diagnostic work-up of a suspected congenital diarrheal disorder, what is a stated contribution of molecular analysis?
- Why may biopsy be part of the evaluation of a suspected congenital diarrheal disorder?
- A team is considering whether to pursue earlier molecular testing in a severely affected infant with suspected congenital diarrhea. Which rationale is supported by the reviews?
- Which statement best characterizes the etiologic scope of congenital diarrheal disorders?
- A patient's stool osmolality and electrolyte results are available. Which expression represents the estimated stool osmotic gap described in the review?
- Stool electrolyte content accounts for nearly all of the measured stool osmolality, producing a relatively small estimated osmotic gap. Which mechanism does this pattern support?
- A stool sample has a markedly increased estimated osmotic gap, suggesting that measured electrolytes do not account for much of its osmolality. Which mechanism is most consistent with this finding?
- A patient has a stool osmotic gap that falls between the low and high extremes. Which interpretation is most appropriate according to the review?
- Which limitation should be considered when interpreting stool osmolality and electrolyte-based estimates?
- Which statement best reflects the review's caution about numerical cutoffs for classifying stool osmotic gaps?
- A laboratory calculation yields a negative estimated stool osmotic gap in a patient with secretory diarrhea. How should this result be interpreted in light of the review?
- A clinician obtains stool osmolality and electrolyte measurements in a patient with diarrhea. Which conclusion is best supported by the review?
- A review of pediatric probiotic use reports that some products reduce the duration of acute infectious diarrhea. What approximate reduction in duration did the review report?
- A clinician is considering a probiotic for acute infectious diarrhea. Which approach best reflects the evidence summarized in the supplied review?
- Which statement best summarizes the review's assessment of evidence for adding prebiotics or probiotics to infant formula to prevent disease?
- A student argues that because a probiotic may reduce antibiotic-associated diarrhea, it must also be effective in inflammatory bowel disease and irritable bowel syndrome. Which response best reflects the supplied review?