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a/A ratio
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RSP250 Chang calcs
Calculations
| Question | Answer |
|---|---|
| Raw | PIP-Plat/Flow (L/sec) |
| a/A ratio | Pao2/PAO2 |
| Bicarb correction of base defecit | BE-Kg/4 |
| BSA | (4xkg)+7/kg+90 |
| CO-Fick method | O2 consumption/CaO2-CvO2 |
| O2 consumption-estimated | 130xBSA |
| Dynamic compliance | Change in V/change in P |
| Static compliance | change in volume/PIP-total PEEP |
| Corrected Vt | Vte-tubing volume |
| Vd/Vt | PaCO2-PeCO2/PaCO2 |
| Expired Minute ventilation | VtxRR |
| Alveolar minute ventiation | (Vt-Vd)xRR |
| CaO2 | (Hbx1.34xSaO2)+(PaO2x.003) |
| time constant | RxC |
| ventialtor rate needed for a desired PaCO2 | knownRRxKnownPaCO2/Desired PaCO2 |
| TCT | Ti+Te |
| calculate a rate from TCT | 60sec/TCT in seconds |
| Calculating Te | TCT-Ti |
| RSBI | f/Vt |
| Female IBW | 105+5(60-HT in inches) |
| Male IBW | 106+6(60-HT in inches) |
| Qs/Qt | (PAO2-PaO2)x0.003/(CaO2-CvO2)+(PAO2-PaO2)x0.003 |
| PAO2 | (Pb-PH2O)xFIO2-PaCO2x1.25 |
| Normal a/A ratio | >60% |
| Average adult BSA | 1.7m2 |
| Normal CO | 4-8L/min |
| Normal Cdyn | 30-40mL/cmH2O |
| Normal Cst | 40-60mL/cmH2O |
| Normal Vd/Vt-spontaneous | 20-40% |
| Normal Vd/Vt-on mechanical ventilation | 40-60% |
| Normal CaO2 | 16-20vol% |
| Normal shunt | <10% |
| Normal RSBI | <100 |
| Desired Vt | Actual VtxActual PaCO2/Desired PaCO2 |
| Desired frequency | Actual frequencyxActual PaCO2/Desired PaCO2 |
| Normal PaO2/FIO2 ratio | 500 |
| Normal PvO2 | 35-40mmHg |
| desired FIO2 | Desired PaO2xKnown FIO2/ KnownPaO2 |
Created by:
thekaplankid
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