As diarrheal fluid is rich in sodium, bicarbonate and potassium diarrhea leads to hypokalemic hyperchloremic metabolic acidosis with dehydration. Mild dehydration: up to 5% total body water (2 to 3L in 70kg man) Normal mental state, dry mucous membranes, usually thirsty, blood pressure and heart rate normal, lower than normal urine output and skin turgor almost normal.
Moderate dehydration: 5-10% total body water (4 to 5 L in 70kg man) Disinterest in surrounding, can be drowsy, increased heart rate and respiratory rate, orthostatic hypotension, decreased skin turgor and reduced urine output
Severe dehydration: 10-15% total body water (7 to 8 L in 70kg man) Reduced conscious level, fast heart rate, low blood pressure, respiratory distress and oliguria/anuria
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