PHTY205 Lecture Notes - Lecture 15: Pulmonary Compliance, Kyphoscoliosis, Intercostal Muscle
Document Summary
Fibrosing disorders: pulmonary congestion, alveolar or interstitial oedema. Increased (lung has lost its recoil: age, older people"s lungs are more compliant (less elastic, emphysema, destruction of collagen tissues -> loss of elasticity, chest wall compliance, reduced (stiffer, kyphoscoliosis, chest wall hyperinflation, pleural effusion/pneumothorax. Increased (floppier: neonates, chest wall is less ossified, acute cervical/high thoracic sci. Intercostal muscles when resting provide a degree of stability/rigidity -> loss of innervation in sci. Describe the effects of changes in airway resistance on respiratory mechanics: airway resistance, flow = change in pressure/raw, difference between palv and pmouth. Laminar & turbulent (more resistance: raw = 8*gas viscosity*length / *radius4, radius has the biggest impact in airway resistance. Factors affecting raw: without lung disease, airway generation, medium size bronchi. Speed of gas moving slows down and is more lamina as the air travels through bronchi: therefore medium is worse than the smallest, phase of breathing cycle, expiration.
