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41 Cards in this Set
- Front
- Back
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660nm: red light: Hb absorbs?
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x 10
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940nm: infrared: HbO2 absorbs?
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x 2
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ratio b/w absorption at 66nm/940nm = 1
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85% ratio
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Empirical in vivo data in order to calibrate pulse ox < 70%, consider "desat monitor" accuracy?
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+/- 2-3%
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Lag time, early v/q mismatch not detected, sensitivity diminished with high FIO2's
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limitations to pulse ox
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Same absorption at 660nm as O2Hb: (CO-OX) multiwavelength invivo?
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CoHb
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Absorbs equal at 660nm & 940 and pulls SpO2 toward 85%. Benzocaine spray, Prilocaine, Sulfonamides?
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MetHb
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O2Hb/(02Hb+Hb)x100
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Functional sat
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O2Hb/(02Hb+Hb+COHb+MetHb)x100
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Fractional Sat
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Alkali breakdown of flurocarbon anesthetics?
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CO production
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Used for determining CO-Hb?
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Co-oximetry
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Drug induced prilocaine?
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Meth-Hb
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Approx.___%CO for each pack/day cigarettes
CO binds to oxygenated hemoglobin 225x better than O2 |
5%
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HbF: O2Hb dissociation curve shifts to the ___
HbS: O2Hb dissociation curve shifts to the ___ |
HbF- L
HbS- R |
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Anemia will underestimate SaO2?
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<8g/dl
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O2Hb & altitude in Denver 5000ft with a PO2= 80, sats?
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95%
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O2Hb and altitude in Breck 10,000ft PO2= 60, sats?
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90%
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Autonomic BP cuffs work by?
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Oscillometry
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Pulsatile nature of bld flow, elasticity of arterial vasculature, changes in posture, resp. cycle, sleep cycle, anxiety,and exercise are factors affecting?
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Peripheral pulse
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P=2T/R
Distended heart, larger radius; if pressure stays constant, what happens to tension? |
increases
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P-2T/R
Distended heart, larger radius; if tension stays constant, what happens to pressure? |
decreases
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Absorption of radiation(light) is proportional to the conc. of the substance?
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Pulse Ox
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"Passing radiation thru a sample and measuring how much radiation is absorbed"?
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Spectrophotometric
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Caution with peds, low flows, sampling gas sidestream
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200cc/min
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Arterial CO2 & Alveolar CO2?
(normal, GA) |
normal 2-5mmhg
GA 5-10mmhg |
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Measures PP of CO2 sampled from the patients exhaled gas and measured at a wavelength of 4.28?
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Infrared analyzer
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Typical granule size?
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4-8mesh
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Adv. of ayre's t-piece?
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low resistance, valveless, minimal dead space
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main source of resistance in the circle system?
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valves (adds 80mJ of wk) resistance increases work of breathing 27%
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What can depress cardiac filling, CO, and increase rate of induction?
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PEEP
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Disadv. of Ayre's T-piece?
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High gas flows, 2-3x min. ventilation, non-scavenging, spont. ventilating only
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Pressure of the pipeline O2?
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50-60
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flammable material, oxidizer, ignition/detonation(energy)
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3 components necessary to have a fire
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not enough fuel, too much oxidizer?
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Lean mixture
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Too much fuel vapor?
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rich mixture
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cylinder pressures for oxygen, nitrous, air?
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O2- 2000
N-745psi Air- 2000 |
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What pressure do you see on the "line" when supply pressure is normal?
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40-50psi
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How do magnetic fieds cause problems for pts?
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magnetic field formed by transformer induces electric currents in the ECG leads and this source of interference, sometimes called inductive coupling, may lead to interference.
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CO2 effects on the oxyhemoglobin dissociative curve
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R shift
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What happens to the P50 for the dissociative curve if it shifts to the R?
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P50 decreased affinity (shifts to R),larger PP necessary to maintain a 50% oxygen saturation.
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Dissolves in the water and reacts with the calcium hydroxide becomes calcium carbonate, dissipates in granules. Granules may have sodium/potassium hydroxide to increase rate of absorption.
Final products water,& heat of CaCO3 |
CO2 absorption
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