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Mech vent final rev.
Shanti's class @ ATI
| Question | Answer |
|---|---|
| What are the advantages of negative pressure ventilator? | We breathe negative pressure |
| What are the disadvantages of negative pressure ventilator? | Limited effectiveness in volume produced, low cardiac output in hypovolemic patients, can facilitate upper airway obstruction |
| Define Transpulmonary Pressure (PL) | pressure difference between alveolus and pleural space. Prevents atelectasis. |
| A patient with this disease has his Transpulmonary pressure. | Congestive Heart Failure |
| Define Transairway Pressure (PTA) | pressure between mouth and the alveolus |
| A patient with this diseaswe has high transairway pressure | Asthma |
| Define Peak Pressure | highest pressure recorded or seen on manometer at end of inspiration. |
| Define plateau pressure | pressure at end of inspiration following a 0.5 to 1.0 second hold. |
| Define static compliance | determines stiffnes of the lung at full inspired ventilator breath |
| What is the normal lung compliance for an intubated male? | 40-50 ml/cmH2O |
| What is the normal lung compliance for an intubated female? | 35-45 ml/cmH2O |
| What is the normal lung compliance for a non-intubated person | 50-170 ml/cmH2O |
| Define time constant | The rate at which lungs are filled |
| Define Dynamic Compliance | determines overall stiffness of lungs to ventilation |
| Define Airway resistance | frictional forces associated with ventilation due to lung tissue viscosity, the anatomical structure of the conducting airways and adjacent tissues and organs. |
| Normal RAW for non-intubated person | .6-2.4L/sec |
| Normal RAW for intubated patient | 6 cmH2O/L/sec |
| Calculation for static compliance | Vt/Plt-PEEP |
| Calculation for dynamic compliance | Vt/PIP-PEEP |
| Calculation for Airway Resistance | [(PIP-PLT)/Insp flow]*60 |
| Control Panel AKA | User interface |
| Control Circuit | Brain. Logical decision making unit of the vent. aka microprocessor |
| Control Variable | Variables remain constant with any change in lung mechanics |
| Conditional Variable | Variable changes with changes in lung mechanics |
| Phase Variable | 3 phases of breath: Trigger, Limit, & Cycle |
| What is trigger variable | Beginning of inspiration, can be patient or machine. machine>time. patient>pressure or flow |
| What is limit variable | Max value |
| What is cycle variable | End of Inspiration |
| Examples of electrically powered ventilator | Bear I & Mac I |
| Examples of pneumatically Powered ventilator | Bird Mark 14 & Monoghan |
| Examples of combined electrically/pneumatically ventilator | Evita Dragger, Servo, Servo 300, 840, Sechrist, star, Bear 1000, viasys |
Created by:
celina1382
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