Flashcards in Lecture 10 - Clinical Assessment of Lung Function Deck (19):
Concurrent measurement of flow and volume duirng maximum effort expiration followed by maximum effort inspiration
diagnose obstructive ventilatory defect, assess fitness, intervention or effect of workplace exposure
Static Lung Volumes and TLC?
Measure all static volumes and capacities of the lung
Static Lung Volumes/TLC Uses?
diagnosis of restrictive ventilatory defect
Measurement techniques for residual volume?
Plethysmography, nitrogen washout, helium dilution
boyles law (P1V1 = P2V2), measuring pressures and change in volume to determine original volume
Helium dilution function?
conservation of mass principle (C1V1=C2V2), when concentration in helium bucket doesnt change (C2), is equal to concentration in lung, therefore calculate volume
Nitrogen wash-out function?
using V nitrogen / 0.79 (conc. of nitrogen) = Vfrc
Single breath carbon monoxide diffusing capacity (DLco)?
Evaluates transfer of gas from airspaces in pulmonary capillaries
evaluation of parenchymal lung disease, differentiating chronic bronchitis, emphysema and asthma, evaluating pulmonary involvement in systemic disease, arterial desaturation during exercise in lung disease
Bronchodilator response - reversibility?
indicated by FEV1 increase of 12-15% (200mL or greater)
Bronchodilator response uses?
indicate reversibility of airway obstructions, evaluate drug regimes for hyper-reactive airways, reversal of bronchospasm
evaluation of airway hyper-responsiveness, indicated in diagnosis of asthma
Challenge test types?
direct (pharmacological) and indirect (hypertonic challenges)
percentage of asthmatics who test positive in specific screening
percentage of patients without disease who test negative
Progressive exercise test components?
ECG, BP, power output, exhaled gas analysis, arterial haemoglobin saturation
Progressive exercise test interpretation?
assessing peak oxygen consumption and determining limitations to increases, measurement of stressors on cardio-pulmonary system