Physiological changes in pediatrics

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“Physiological changes in pediatrics” is a broad topic, spanning normal developmental differences from the neonate through adolescence. The main principle is that children are not small adults: normal values, organ reserve, metabolism, and clinical responses vary substantially with age. For example, their higher surface-area-to-mass ratio and immature thermoregulation make neonates especially prone to heat loss. Mulholland and Greenfield's Surgery, p. 5303.

Growth, body composition, and temperature regulation
Respiratory system
Cardiovascular system and age-specific vital signs
Renal function and fluid-electrolyte balance
Gastrointestinal and hepatic function
Nervous, endocrine, and metabolic physiology
Hematology and immunity
Pharmacokinetic implications and clinical relevance

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“Physiological changes in pediatrics” is a broad topic, spanning normal developmental differences from the neonate through adolescence. The main principle is that children are not small adults: normal values, organ reserve, metabolism, and clinical responses vary substantially with age. For example, their higher surface-area-to-mass ratio and immature thermoregulation make neonates especially prone to heat loss. Mulholland and Greenfield's Surgery, p. 5303.

Growth, body composition, and temperature regulation
Respiratory system
Cardiovascular system and age-specific vital signs
Renal function and fluid-electrolyte balance
Gastrointestinal and hepatic function
Nervous, endocrine, and metabolic physiology
Hematology and immunity
Pharmacokinetic implications and clinical relevance

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A detailed pediatric physiology answer can be organized as:

Growth and body composition: total body water, extracellular fluid, body surface area, fat and muscle.
Thermoregulation: increased heat loss, brown-fat thermogenesis, neonatal hypothermia risk.
Respiratory physiology: airway size, chest-wall compliance, oxygen consumption, respiratory fatigue, age-related respiratory rate.
Cardiovascular physiology: heart rate, blood pressure, cardiac output dependence on heart rate, blood volume, compensated shock.
Renal and fluid-electrolyte physiology: immature GFR and tubular function, limited concentrating ability, dehydration risk.
Gastrointestinal and hepatic physiology: feeding, gastric emptying, glycogen stores, bilirubin metabolism, immature drug metabolism.
Metabolic and endocrine physiology: higher basal metabolic rate, glucose homeostasis, calcium and vitamin D physiology.
Hematology and immunity: fetal-to-adult hemoglobin transition, physiologic anemia of infancy, immature immunity.
Neurologic physiology: rapid brain growth, fontanelles, age-dependent reflexes, pain and temperature responses.
Clinical implications: age-specific normal vital signs, fluid calculation, drug dosing, shock recognition, airway management.

High-level overview: Pediatric physiology changes continuously from fetal life through neonatal life, infancy, childhood, and adolescence. The youngest children have relatively high metabolic and oxygen requirements but limited cardiopulmonary, renal, thermal, and glucose reserves. Hence illness may deteriorate rapidly, while early shock can present with tachycardia and poor perfusion before hypotension occurs. Normal findings and treatment doses must always be interpreted by age and weight.

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