ventilators Flashcards
what arterial PaO2 warrants mechanical ventilation if the patient is on supplemental oxygen?
55-60 mm Hg
Alveolar-to arterial oxygen difference of what warrants mechanical ventilation initiation? on what FiO2?
greater than 350 mm Hg
100%
what arterial carbon dioxide level warrants initiation of mechanical ventilation? in the absence of what? with what pH
greater than 50 mm Hg
absence of chronic disease
with a less than 7.2 pH
what respiratory rate and tidal volume indicates increased work ob breathing and the need for mechanical intubation?
greater than 35 /min
tidal volume less than 5 mL/kg
what vital capacity warrants initiation of mechanical ventilation?
less than 10-15 mL/kg
what maximum inspiratory pressure/negative inspiratory force indicates a need for starting mechanical ventilation?
less than 25 cm H20
what FEV1 indicates a need to start mechanical ventilation?
10 mL/kg
what signs and symptoms indicates a need for mechanical ventilation?
retractions
nasal flaring
paradoxical/divergent chest motion
what is the goal of mechanical ventilation?
normalize arterial blood gas levels and acid-base imbalances in patient unable to maintain this balance independently
what are the objectives of initiation of mechanical ventilation are? (3)
reverse hypoxemia and acidosis
relieve respiratory distress
decrease work of breathing
what three things should be considered when determining the type of ventilator support for a patient?
patient’s physiological status
goal of treatment
type of ventilators and modes available
what is volume control ventilations initiation trigger?
time
what is VCV limit trigger?
volume
what is VCV cycle trigger?
volume/time
what is Pressure control ventilation initiation trigger?
time
