This document provides information on mechanical ventilation management. It discusses the goals of airway management and indications for mechanical ventilation. The roles of nurses include monitoring patients on ventilators and notifying respiratory therapists when issues arise. There are two main types of ventilators and settings must be individualized. Modes of ventilation are described along with weaning and extubation processes. Alarms are addressed and their common causes.
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2. Airway Management & Mechanical
Ventilation Basics
The goal of airway management is to ensure that
the patient has a patent airway through which
effective ventilation can take place.
An obstructed airway causes the body to be
deprived of oxygen and, if ventilation isn’t
reestablished, causes brain death within minutes.
3. Indications
1. The patient experiencing respiratory failure
or arrest .
2. Any patient experiencing respiratory
distress with impincreased aired gas
exchange or work of breathing before they
reach the point of respiratory arrest.
3. Hypercabnia & hypoxemia.
4. Role of the Nurse
Monitoring the patient’s respiratory status.
Keep an eye on any equipment required by
the patient, includingventilators and
monitoring equipment, and to respond to
monitor alarms.
5. Notifying the respiratory therapist when
mechanical problems occur with the ventilator,
and when there are new physician orders that
call for changes in the settings or the alarm
parameters
The nurse is responsible for documenting
frequent respiratory assessments.
Role of the Nurse
7. Operation and Maintenance
Many ventilators are now computerized and
have a user-friendly control panel. To activate
various modes, settings, and alarms, the
appropriate key need only be pressed.
Ventilators are electrical equipment and must
be plugged in.
8. Operation and Maintenance
There should be a manual resuscitation bag
at the bedside of every patient receiving
mechanical ventilation, so they can be
manually ventilated if needed.
When mechanical ventilation is initiated, the
ventilator goes through a self-test to ensure
that it’s working properly.
9. Operation and Maintenance
The ventilator tubing should be changed every
24 hours and another self-test run afterwards.
The bacteria filters should be checked for
occlusions or tears and the water traps
10. Ventilator Settings
Ventilator settings are ordered by the
physician and are individualized for each
patient.
Ventilators are designed to monitor many
components of the patient’s respiratory status.
Various alarms and parameters can be set to
warn healthcare providers that the patient is
having difficulty with the settings.
11. Respiratory Rate (RR)
The respiratory rate is the number of breaths
that the ventilator delivers to the patient each
minute.
The rate chosen depends on the tidal volume,
the type of pulmonary pathology, and the
patient’s target PaCO2.
12. Tidal Volume (VT)
The tidal volume is the volume of gas the
ventilator delivers to the patient with each
breath.
The usual setting is 5-15 cc/kg, based on
compliance, resistance, and type of pathology.
13. Fractional Inspired Oxygen
(FIO2)
The fractional inspired oxygen is the amount
of oxygen delivered to the patient.
It can range from 21% (room air) to 100%.
It’s recommended that the FIO2 be set at 1.0
(100%) upon the initiation of mechanical
ventilation.
14. Fractional Inspired Oxygen (FIO2)
Most ventilators have a temporary 100%
oxygen setting that delivers 100% oxygen for
only a few breaths. This should always be
used prior to and after suctioning; during
bronchoscopy, chest physio-therapy, or other
stressful procedures; and during patient
transport.
15. Inspiratory: Expiratory
(I:E) Ratio
The I:E ratio is usually set at 1:2 or 1:1.5 to
approximate the normal physiology of
inspiration and expiration.
16. Pressure Limit
The pressure limit regulates the amount of
pressure the volume-cycled ventilator can
generate to deliver the preset tidal volume.
Because high pressures can cause lung
injury, it’s recommended that the plateau
pressure not exceed 35 cm H20.
17. Pressure Limit
High pressure can be that the patient’s airway
is obstructed with mucus.
It can also be caused by the patient coughing,
biting on the ETT, breathing against the
ventilator, or by a kink in the ventilator tubing.
The high pressure is usually resolved with
suctioning
18. Ventilators Settings
SETTING FUNCTION USUAL PARAMETERS
Respiratory Rate (RR) Number of breaths
delivered by the
ventilator per minute
Usually 4-20 breaths
per minute
Tidal Volume (VT) Volume of gas delivered
during each ventilator
breath
Usually 5-15 cc/kg
Maximum amount of
pressure the ventilator
can use to deliver
breath
Amount of oxygen
delivered by ventilator
to patient
21% to 100%; usually set
to keep PaO2 > 60 mm Hg
or SaO2 > 90%
Inspiratory: Expiratory
(I:E) Ratio
Length of inspiration
compared to length of
expiration
Usually 1:2 or 1:1.5 unless
inverse ratio ventilation is
required
Pressure
Limit
Maximum amount of
pressure the ventilator
can use to deliver breath
10-20 cm H2O above peak
inspiratory pressure;
maximum is 35 cm H2O
19. Ventilator Modes
Mode refers to how the machine will ventilate the
patient in relation to the patient’s own respiratory
efforts.
SIMV (spontaneous Intermittent mechanical
ventilation )
Pressure Support Ventilation
Constant Positive Airway Pressure
20. Synchronous Intermittent
Mandatory Ventilation (SIMV)
is used as a primary mode of ventilation, as well
as a weaning mode.
The disadvantage of this mode is that it may
increase the work of breathing and respiratory
muscle fatigue.
21. Pressure Support Ventilation
(PSV)
The patient completely controls the
respiratory rate and tidal volume.
PSV is used for patients with a stable
respiratory status and is often used with
SIMV to overcome the resistance of breathing
through ventilator circuits and tubing.
22. Positive End Expiratory Pressure
(PEEP)
PEEP is positive pressure that is applied by
the ventilator at the end of expiration.
Complications from the increased pressure
can include decreased cardiac output,
pneumothorax, and increased intracranial
pressure.
23. Constant Positive Airway Pressure
(CPAP)
CPAP is similar to PEEP except that it works
only for patients who are breathing
spontaneously.
CPAP can also be administered using a mask
and CPAP machine for patients who
do not require mechanical ventilation, but
who need respiratory support
24. Alarms and Common Causes
High Pressure
Limit
Low Pressure High Respiratory
Rate
Low Exhaled
Volume
• Secretions
in ETT/airway or
condensation in
tubing
• Kink in vent
tubing
• Patient biting on
ETT
• Patient
coughing, gagging,
or trying to talk
• Increased
airway pressure
from
bronchospasm or
pneumothorax
• Ventilator
tubing not
connected
• Displaced ETT
or tracheostomy
tube
• Patient anxiety
or pain
• Secretions in
ETT/airway
• Hypoxia
• Hypercabnia
• Ventilator
tubing not
connected
• Leak in cuff or
inadequate cuff
seal
• Occurrence of
another alarm
preventing full
delivery of breath
25. Weaning & Extubation
It is usually a gradual process.
The modes of mechanical ventilation are
gradually changed to allow the patient to
initiate more breaths while the ventilator
provides less.
Weaning should not be attempted until the
patient’s respiratory status is stable and they
are arousals and able to follow
commands.
26. Weaning & Extubation
Weaning is accomplished by decreasing the
number of breaths supplied by the ventilator, as
well as by changing the way in which those
breaths are delivered to the patient.
27. Extubation
the nurse should obtain the ABG prior to the
weaning.
Once the physician’s order to extubate is
received, the nurse and RT coordinate a time
when they can both be in the patient’s room.
The RT is usually responsible for assembling the
oxygen delivery system to be used after
extubation.
28. Extubation
The nurse should explain the procedure to the
patient and prepare suction. The patient should
be sitting up at least 45 degrees.
Prior to extubating, the patient should be
suctioned both via the ETT and orally.
All fasteners holding the ETT should be
loosened.
29. Extubation
A sterile suction catheter should be inserted into
the ETT and withdrawn as the tube is removed.
The ETT should be removed in a steady, quick
motion as the patient will likely cough and gag.
30. Extubation
The patient should be asked to cough and speak.
Quite often, the patient’s first request is for water
because of a dry, sore throat. Generally, you can
immediately swab the patient’s mouth with an oral
swab dipped in water.