A 16-month-old with acute watery diarrhoea in a rural health unit
A 16-month-old boy is brought to a rural family health unit in Minya in August with watery diarrhoea for 3 days and vomiting twice today. He is still breastfed and takes family food. Weight today is 9.5 kg and was 10.4 kg three weeks ago. He is irritable, drinks eagerly from a cup, his eyes are sunken, the skin pinch returns in about 1.5 seconds, his mouth is dry, he has no tears and the anterior fontanelle is slightly sunken. There is no blood in the stool, temperature is 37.8 °C, respiratory rate 38/min with no chest indrawing, and the mother thinks he has not passed urine for 10 hours. She has already given a home-made salt-and-sugar solution and stopped all food 'to rest his stomach'. She asks for an antibiotic and an anti-diarrhoeal syrup because 'the pharmacy gave them last time'. The unit has WHO low-osmolarity ORS sachets, zinc tablets and intravenous Ringer's lactate; the district hospital is 30 km away and the ambulance is shared with two other units.
1. Classify his dehydration using WHO/IMCI criteria and state which treatment plan applies, showing your reasoning.
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Apply the WHO/IMCI sign-based classification before looking at the weight loss, then use the weight to confirm it.
Signs of 'some dehydration' present (two or more needed):
- Restless/irritable
- Sunken eyes
- Drinks eagerly / thirsty
- Skin pinch goes back slowly (~1.5 s)
Signs of severe dehydration are absent: he is not lethargic or unconscious, he is able to drink, and the skin pinch is not 'very slow' (≥2 s). There is no blood in the stool and no sign of another severe infection.
Confirmation: weight has fallen from 10.4 to 9.5 kg - about 8.7% loss, consistent with moderate (some) dehydration rather than severe.
Therefore: SOME DEHYDRATION → Plan B, in the unit, not at home and not automatically by referral.
Two traps this case is testing. First, the sunken fontanelle and absent urine are supportive but are not part of the WHO classification - do not upgrade him to severe on those alone. Second, the shared ambulance and the distance to hospital tempt over-referral; Plan B is deliverable here and referral would delay rehydration. The correct response is to treat with ORS and to refer only if he fails Plan B or develops severe signs.
2. Write the exact prescriptions and feeding advice, including volumes and timing.
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Plan B - ORS over 4 hours
- Volume: 75 mL/kg × 9.5 kg ≈ 700 mL over 4 hours (about 175 mL per hour).
- Method: cup and spoon, small frequent sips; if he vomits, wait 10 minutes and resume more slowly.
- Breastfeeding: continue on demand between ORS sips - do not stop.
- Reassess at 4 hours using the same four signs. If some dehydration persists, repeat Plan B once; if he improves, switch to Plan A.
Zinc
- Zinc 20 mg once daily for 14 days (10 mg if under 6 months; he is over 6 months). Start today even though the diarrhoea is already 3 days old - it shortens this episode and reduces recurrence over the next 2–3 months.
Feeding
- Restart normal family food within 4 hours, in small frequent portions; do not dilute or withhold food. Withholding food, as the mother has done, prolongs diarrhoea and delays recovery.
- After rehydration, give 50–100 mL of ORS after each loose stool (under 2 years) in addition to normal fluids.
Plan A counselling for discharge
- Extra fluids, continued feeding, ORS after each stool, handwashing with soap, safe water, and the specific danger signs that should bring him back. Use the ORS sachet with exactly 1 litre of clean water and discard after 24 hours.
3. Justify refusing the antibiotic and the anti-diarrhoeal, and list the findings that would make you refer immediately.
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Antibiotic - not indicated. Acute watery diarrhoea without blood, without suspected cholera, and without an identified systemic infection is usually viral. Antibiotics do not shorten it, do not reduce fluid loss, and cause antimicrobial resistance and side effects. Dysentery (visible blood), suspected cholera with severe dehydration, and proven invasive infection are the recognized exceptions; none applies here.
Anti-diarrhoeal - contraindicated. Loperamide and similar agents are contraindicated under 2 years: risk of ileus, sedation, respiratory depression and death. Adsorbents and antisecretory 'syrups' have no proven benefit. The pharmacy's previous prescription was inappropriate and should be addressed directly with the mother, without blaming her.
Refer immediately if any of the following appear:
- Lethargy, unconsciousness, or convulsions
- Unable to drink or drinks poorly
- Skin pinch very slow (≥2 s) or worsening sunken eyes - i.e. severe dehydration
- Persistent vomiting that prevents ORS, or abdominal distension/ileus
- Blood in the stool or high fever (≥39 °C)
- No urine output, or signs of acute kidney injury
- Failure of Plan B after a second 4-hour cycle
Tell the mother these signs explicitly, give written instructions and a return date, and document that she was counselled. Emphasize that ORS given early at home prevents most of these presentations.