Introduction
Scenario setup A 18-month-old has diarrhea × 2 days, few wet diapers, dry lips, cries without tears. HR 168, RR 36, cap refill 4 seconds. Weight down from baseline per parent. This suggests moderate-to-severe dehydration. PN priorities: notify RN/provider, NPO vs ORT per order, monitor vitals, prepare for IV therapy if severe. PN traps: routine play therapy first, giving plain water alone in infants without guidance, delaying escalation. This case-study format is intentional: boards reward trajectory thinking—what changed, what is unstable, and what you do next for the role named in the stem. For NCLEX-PN (United States), read the assignment line before you eliminate answers. Slow read: re-scan the stem for vitals trends, oxygen settings, allergies, and time since onset—case items often hide the decisive clue in a single line. On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a : breathing work and oxygenation, perfusion and...