1794869
Description
Flashcards by Aline Mola, updated more than 1 year ago
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Created by Aline Mola
over 9 years ago
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| Question | Answer |
| techniques to measure resp airflow and volume | - measure airflow and derive volume: pneumotachometry nasal thermistor - measure volume and derive airflow volumetric spirometry |
| what is pneumotachometry and how is it measured? | determines volume by pressure on both sides of a resistence. can determine airflow (dif P=FxR) fleish pneumotach - flow comes in through mouthpiece through R (P1-P2). this goes to a pressure transducer that measures P and is read by a voltmeter. saliva/condensation alters resistence |
| when do we use volumetric spirometry w/out gas conditioning? | - can record rapid changes in V - usually used with a rolling seal - good for recording V-V' curves - can't do prolonged breathing |
| when do we use volumetric spirometry w/ gas conditioning? | - can measure prolonged breathing - measures RV, TLC by helium-dilution, FEV1, FVC, breathing pattern, O2 consumption - can be used during exercise - water seal - can't do fast V changes |
| non-invasive ways to estimate arterial blood gases | - capnometer (measures CO2 in exp. - end tidal levels +/- ABG levels) - however unreliable in lung disease - pulse oximeter - uses red and IR light to measure O2 saturation in finger: O2-rich blood absorbs more IR |
| how is resp. drive inferred from surface EMG and airway pressure? | - measures diaphragm electrical activity via chest wall electrodes to measure neural respiratory drive - not gold std. for assessing resp effort & neural resp drive (that's esophageal pressure measurement), but is non-invasive - Tang, Lu & Luo (2009) - show it's successful in 9/11 patients |
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