1. Pneumatic Ventilators us what for a drive gas?
1. 100% O2 or Air. Air compresses bellows to deliver internal bellow gas to the patient.
1. What are the different types of Ventilator Modes?
1. Vol. control - Delivers set vol or when pMax is reached
2. Pressure control - Target pressure is set and maintianed for a certain amnt. time. Thus TV varies.
1. Most common Ventilators use Ascending or Descending? Why?
1. Ascending - No chance for neg pressure.
2. Ascend = ascend during EXpiration
1. What valve prevents build up of pressure in the bellows? 2. When does it remain open? 3. Shut during______ unless set pressure exceeded. Where does the gas exit?
1. overflow or spill valve
2. during expiratory phase and drive gas is emptying due to bellow filling.
What should be your reaction to an unresolvable alarm?
1. Turn off vent. increase flows and manually ventilate.
1. What would a reverse flow alarm potentially mean?
1. incompitent unidirectional expiratory valve.
What is PSV?
1. Pressure Support Ventilation
2. Requires SPONTANEOUS vent.
3. Will switch to backup mode if no spontaneous breathing after 15-30 secs.
1. What is VCV or CMV?
3. normal Peak Pressure and vol?
1. Volume control ventilation - Delivers set Vol up to PIP (peak insp. press.)
- Gas delivered at constant flow "Shark fin".
- Modify rate and volume adjust to meet ETCO2 requirements.
3. 40 cm H2O/ TV - 10ml/kg.
1. PCV and How it works?
2. What pts need a larger volume thus > PIP setting?
3. What is PCV - VG
1. Pressure controlled mandatory ventilation.
- Delivers vol. up to set PIP and stops. Vol is pt lung dependent.
- Great for kids, non-compliant lungs, LMA (PIP 20mm h20)
2. Pregnant, Laparoscopic sx (pneumoperitoneum), obese, ARDS.
3. VG = dynamically adjust insp pressure to guarantee min Volume.
1. Spontaneous Intermittent Manditory Ventialation
2. Delivers up to set Volume
3. Delivers up to set Pressure
3. Delivers up to set pressure - Dynamically regulates PIP to ensure Volume.