Diarrhoea is characterized by the passage of three or more loose or liquid stools per day, representing a significant change from a person's normal bowel habit. Frequent formed stools do not constitute diarrhoea, nor does the passing of loose, 'sticky' stools by breastfed babies. Clinically, healthcare providers categorize the condition based on duration:
Fluid movement in the gastrointestinal tract relies on a balance between absorption and secretion across the intestinal mucosa. When this balance is disrupted, diarrhoea ensues through distinct physiological mechanisms:
The clinical presentation of diarrhoea extends beyond frequent bowel movements. Nurses must assess for signs of systemic involvement and fluid volume depletion.
Frequent watery evacuations strip the body of water and essential electrolytes, particularly sodium and potassium. Assessment must systematically target skin turgor, mucous membranes, capillary refill time, urine output, and sensorium. In children, sunken fontanelles and absence of tears during crying serve as critical red flags for severe dehydration. Abdominal cramping, low-grade fever, and nausea frequently accompany infectious etiologies, whereas significant weight loss points toward chronic conditions.
While mild acute cases often resolve without laboratory testing, targeted investigations become necessary when symptoms persist, blood appears in the stool, or signs of systemic toxicity develop.
Pharmacological therapy depends entirely on the underlying cause of the diarrhoea. Antibiotics are withheld in simple viral gastroenteritis and reserved for confirmed bacterial or parasitic infections like cholera or giardiasis. Antimotility drugs, such as loperamide, slow gut transit but are strictly contraindicated in invasive bacterial infections because trapping pathogens in the gut worsens systemic toxicity. Zinc supplementation is a cornerstone in managing paediatric diarrhoea, proven to reduce the duration and severity of episodes when administered alongside oral rehydration salts.
The primary objective in nursing management of diarrhoea is the prevention and treatment of dehydration. Oral Rehydration Therapy (ORT) using Oral Rehydration Salts (ORS) remains the gold standard for replacing lost water and electrolytes, utilizing the sodium-glucose cotransporter mechanism in the small intestine. For severe dehydration or shock, rapid intravenous fluid resuscitation with normal saline or Ringer's lactate is initiated immediately. Nurses must accurately monitor and record fluid intake and output, weigh patients daily, maintain perineal skin integrity due to the corrosive nature of frequent loose stools, and educate families on safe hygiene practices.
Unmanaged diarrhoea leads to severe, life-threatening complications. Severe dehydration precipitates hypovolemic shock, acute kidney injury, and electrolyte disturbances such as severe hypokalemia, which triggers fatal cardiac arrhythmias. Metabolic acidosis frequently develops due to the excessive loss of bicarbonate ions in diarrhoeal stools.
Patient and caregiver education focuses on primary prevention: handwashing with soap after toilet use and before food handling, safe drinking water storage, proper food hygiene, and exclusive breastfeeding for infants during their first six months of life.