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Terms in this set (42)
overview of ventilation
overview of ventilation
500ml --> amount of air we breath in
--> tidal volume times the breaths per min
15 x 500= 7,500
(Tidal volume - dead space volume) x RR
150 ml no gas exchange
Calculate alveolar ventilation of a subject with tidal volume of 600 ml , anatomical dead space of 150 ml and respiratory rate (RR) of 20?
450ml x 20ml = 9 L
is the normal amount of air going in and out
Inspiratory reserve volume: the maximal volume that can be inhaled from the end-inspiratory level
Expiratory reserve volume: the maximal volume of air that can be exhaled from the end-expiratory position
Residual volume: the volume of air remaining in the lungs after a maximal exhalation
Functional residual capacity: the volume in the lungs at the end-expiratory position
(RV + ERV) =2400ml
Vital capacity: the volume of air breathed out after the deepest inhalation.
OR Forced Vital capacity (FVC) =IRV + TV (=IC) + ERV = 4800ml
Significance of RV
Prevent collapse of alveoli
Ensuring continuous Blood-Gas exchange
Buffering of alveoli gas - Keep the composition of alveolar gases constant
Inspiratory capacity: the sum of IRV and TV
(IRV + TV =3600ml)
Total lung capacity: the volume in the lungs at maximal inflation, the sum of VC and RV.
IRV + TV (=IC) + ERV + RV = 6000ml (6 liters)
Measurement of RV
1. Closed circuit method (Helium method)
2. By Body Plethysmograph method
what is it called when some alveoli may be ventilated but not perfused?
This section of the lung function similar to anatomical dead space.
physiological dead space.
The combination of this section and anatomical dead space
(anatomical dead space + alveolar dead space )
-Measurement by using - Bohr's formula (Bohr's equation)
graphs of TVC of normal, restrictive, and Obstructive
eg. 2 respiratory loop
eg2. respiratory loop
Determine if the spirograms are acceptable & reproducible
Normal FEV1/ FVC ratio
800/ 1000= 80%
Obstructive FEV1/ FVC ratio
restrictive FEV1/ FVC ratio
(FVC) in unit of time
Forced vital capacity: the determination of the vital capacity from a maximally forced expiratory effort
Forced expiratory volume (time): a generic term indicating the volume of air exhaled under forced conditions in the first t seconds
80 to 85% ( 1st second)
90 to 95% ( 2nd second)
>97% (3rd second)
reduced FEV1 and FVC
FEV1/ FVC normal
reduced FEV1/ FVC
Obstructive Lung disease
--( chronic bronchitis <---------------->emphysema)
Restrictive Lung Disease
-Interstitial lung disease( eg. pulmonary fibrosis, sarcoidosis)
-chest wall pathology(eg. kyphosis, scoliosis)
-Neuromuscular disease (eg. ALS, muscular dystrophy)
Pulmonary Vascular Disease
-Primary pulmonary hypertension
-chronic thromboembolic disease
Interpretation of FEV1, FVC and FEV1/ FVC ratio
eg. 3 respiratory loop
Upper airway obstructions
Sets with similar terms
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