What are the parameters in ventilator APRV mode and how to adjust them?

P high indicates high airway pressure.

Low p means low airway pressure.

T height refers to the duration of airway high pressure.

T low refers to the duration of the pressure at the bottom of the airway.

I. Classification by use or application type

(1) Controlled mechanical ventilation (CMV)

1, definition: When the patient's spontaneous breathing weakens or disappears, the patient's breathing is completely generated, controlled and regulated by mechanical ventilator. ?

2. Applicable to: disappearance or weakening of spontaneous breathing caused by disease; When spontaneous breathing is irregular or the frequency is too fast, and mechanical ventilation can't cooperate with patients, spontaneous breathing can be inhibited or weakened by artificial methods.

(2) Auxiliary mechanical ventilation (AMV)

1, definition: when the patient's breathing exists, the ventilator assists or enhances the patient's spontaneous breathing. All kinds of mechanical ventilation are mainly triggered by patients' inspiratory negative pressure or inspiratory airflow. ?

2. Application: Although spontaneous breathing exists and is regular, it is weakened and the ventilation is insufficient.

Extended data:

First, the main mechanical ventilation mode

(1) intermittent positive pressure ventilation (IPPV): positive inspiratory pressure, zero expiratory pressure.

1. working principle: the ventilator generates positive pressure in the inspiratory phase, pushing the gas into the lungs. When the pressure rises to a certain level or the inspiratory volume reaches a certain level, the ventilator stops supplying gas, the expiratory valve opens, and the patient's chest and lungs passively collapse, resulting in exhalation. ?

2. Clinical application: all kinds of patients with respiratory failure mainly with ventilation function, such as COPD.

(2) Intermittent positive and negative pressure ventilation (IPNPV): positive inspiratory pressure and negative expiratory pressure. ?

1. working principle: the ventilator can work in two stages: inhalation and exhalation.

2. Clinical application: Negative expiratory pressure can cause alveolar collapse, leading to iatrogenic atelectasis.

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