How would you support oxygenation and CO2 removal?
Oxygenation: Adequate mean airway pressure CO2 removal: Adequate minute ventilation
How would you optimize lung mechanical function?
1. Compliance & Resistance 2. Time Constant: C x R
What is a time trigger mechanism?
It is controlled mechanical ventilation - there is NO patient interaction.
What is a pressure trigger mechanism?
The ventilator senses a drop in pressure with patient effort.
What is a flow trigger mechanism?
The ventilator senses a drop in flow with patient effort.
What is a chest impedance / abdominal movement trigger mechanism?
The ventilator senses respiratory/diaphragm or abdominal muscle movement.
What is a diaphragmatic activity trigger mechanism?
NAVA = Neurally adjusted ventilatory assist - Probe is inserted down esophagus and when it senses any electrical activity going toward diaphragm, it triggers a breath (the patient just has to think about giving a breath and one is delivered)
On what type of modes are time cycles used?
On all ventilators
On what type of modes are flow cycles used?
Pressure support mode
What type of modes are volume cycles used?
Adult / pediatric ventilators
What does the CPAP mode offer?
It has +/- pressure support
What does the IMV/SIMV mode offer?
+/- pressure support, volume targeting
What does assist control (pressure) offer?
It has +/- volume targeting. It is a pressure breath with a volume target. The machine wants to give a patient a certain TV so the pressures will either increase or decrease to give that tidal volume