Flashcards
non-invasive exams (pathophysiology)
Cards in this deck (6)
- 1techniques to measure resp airflow and volume- measure airflow and derive volume:
pneumotachometry
nasal thermistor
- measure volume and derive airflow
volumetric spirometry - 2what 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 - 3when 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 - 4when 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 - 5non-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 - 6how 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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- Flashcards on non-invasive exams (pathophysiology), created by Aline Mola on 15/12/2014.
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- Aline Mola · Dec 2014
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- Feb 19, 2016
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