Mechanical Ventilation Clinical Trial
Official title:
Computer Driven Management of Weaning Following Prolonged Mechanical Ventilation: a Pilot Study
After an episode of acute respiratory failure requiring mechanical ventilation, weaning the
patient from the ventilator may be difficult. Discontinuation of ventilation is estimated to
take up to 40% of the total duration of ventilatory support. Approximately two- thirds of
patients can be disconnected from the ventilator after a spontaneous breathing trial.
Prolongation of mechanical ventilation may increase the risk of adverse events such as
infections and can increase morbidity and mortality.
Identifying weaning readiness early and reliably is therefore crucial. Weaning protocols
developed to assist in identifying weaning readiness have been shown to shorten duration of
mechanical ventilation, most notably the weaning period.
Closed loop knowledge-based systems serve as a continuously applied weaning process that
automatically reduce ventilatory assistance according to patient ability and indicate when
the patient is ready for disconnection. No data on the use of such a computer driven system
(CDS) in elderly patients requiring prolonged ventilation in weaning centers (non ICU) have
been reported.
The Objective of the present study is to evaluate the ability of a computer driven system to
predict weaning readiness and to compare this to a physician-directed protocol. The CDS
continuously adapts pressure support, gradually decreasing ventilator assistance according
to patient ability, and thus indicates weaning readiness. Patients who maintain spontaneous
breathing for 7 days following weaning will be considered to be successfully weaned from
mechanical ventilation.
Introduction.
After an episode of acute respiratory failure requiring mechanical ventilation, weaning the
patient from the ventilator may be difficult. Discontinuation of ventilation is estimated to
take up to 40% of the total duration of ventilatory support. Approximately two- thirds of
patients can be disconnected from the ventilator after a spontaneous breathing trial.
Prolongation of mechanical ventilation may increase the risk of adverse events such as
infections and can increase morbidity and mortality.
Identifying weaning readiness early and reliably is therefore crucial. Weaning protocols
developed to assist in identifying weaning readiness have been shown to shorten duration of
mechanical ventilation, most notably the weaning period.
Closed loop knowledge-based systems serve as a continuously applied weaning process that
automatically reduce ventilatory assistance according to patient ability and indicate when
the patient is ready for disconnection. No data on the use of such a computer driven system
(CDS) in elderly patients requiring prolonged ventilation in weaning centers (non ICU) have
been reported.
Objective:
To evaluate the ability of a computer driven system to predict weaning readiness and to
compare this to a physician-directed protocol. The CDS continuously adapts pressure support,
gradually decreasing ventilator assistance according to patient ability, and thus indicates
weaning readiness. Patients who maintain spontaneous breathing for 7 days following weaning
will be considered to be successfully weaned from mechanical ventilation.
Design and setting:
A single center, randomized, controlled clinical study at the Beit Rivka regional weaning
center (RWC).
Patients.
This study will be conducted at the Beit Rivka geriatric rehabilitation hospital, Petah
Tikva. Written informed consent will be obtained from the patient or legal representative.
The study will include 60 consecutive patients who meet all inclusion criteria after
stabilization of the acute health problems that prompted admission to the referral hospital.
Inclusion criteria are as follows: pressure support ventilation (PSV) for at least 48 h,
plateau pressure less than 30 cmH2O, PEEP < 6 cmH2O, PaO2/FIO2 ratio > 150 or SaO2 > 94%
with FIO2 < than 0.5, pCO2 <55 mm Hg for normal patients and < 65 m Hg for patients with
COPD, no requirement for inotropic support, body temperature > 36.50C and < 38.50 C, stable
neurological status with Glasgow Coma Score (GCS) > 6, HgB > 8 mg %, systolic blood pressure
>90 mg Hg, mean arterial pressure >65 mg Hg, absence of sedative medications and
availability of CDS at the time of patient admission or switching to pressure support
ventilation (PSV). Patients younger than 60 or older than 85 years of age, patients on
chronic ventilatory assistance at home, and patients with decision to limit life-sustaining
treatments will be excluded.
Treatment group assignment will be by a sealed envelope upon admission to the hospital.
Attending doctors will not be blinded as to the treatment groups.
Description of the computer driven system.
The CDS is a knowledge- based system embedded in a ventilator (EVITA XL) (15, 16, 17). It
achieves three main goals. First, the CDS continuously adjusts the PSV level based on
respiratory rate (RR), tidal volume (Vt) and end-tidal partial pressure of CO2 (PETCO2)
acquired from the ventilator in real time and averaged over 2 min. Adjustment is such that
the patient is kept within a "comfort zone” defined as a RR between 15-30 range (up to 34
within patients with neurological disorders), Vt greater than 300 ml (< 250 ml if body
weight < 55 kg), and PETCO2 less than 55 mm Hg (< 65 mmHg in patients with COPD). Second,
the CDS gradually decreases ventilatory assistance by reducing PSV level after at least 30
min of stable ventilation within the comfort zone; the reduction is by 2 or 4 cm H20
depending on whether the initial level is below or above 20 cm H2O, respectively. Third, the
CDS evaluates weaning readiness: when the PSV level reaches the preset minimal value (9 cm
H2O in tracheotomized patients), the CDS starts an observational period, which serves as
automatic spontaneous breathing trial. After uninterrupted ventilation at the minimal PSV
level for 1 or 2 h (depending on whether the initial PSV level was above or below 15 cm
H2O), the CDS displays a message that the patient is ready to be disconnected from the
ventilator. The investigator will have perfect knowledge of the system.
Prediction of weaning. Weaning readiness as evaluated by the CDS and by the internist will
be recorded daily, i.e., every morning between 10 and 11 a.m. The decision will be
considered to be taken by the CDS before the physician when it was taken 1 day in advance,
i.e., the preceding morning. Physicians will be aware of the PSV level delivered by the CDS
and could take this level into account in their evaluation. Weaning protocols used routinely
in the center recommend a daily assessment for weaning similar to that used by the CDS.
Patients are declared weaned as soon as the physician or CDS predicts weaning readiness. The
control group reflects the standard of care before CDS implementation. PS of 10 cm H2O or
higher is set manually. After 20 min, in the absence of signs of poor tolerance, the PSV is
reduced by 4 or 2 cm H20 (depending on initial PSV level > or < 20). If poor tolerance to
weaning is evident, the progression of the weaning is stopped, and the patient is reassessed
20 min later for further reduction in PSV. The PSV level is decreased to 9 cm H2O. In the
case of apnea, SIMV is reinstituted. If the evaluation is satisfactory, the patient is
disconnected from the ventilator. The patient is closely monitored for signs of respiratory
failure requiring reinstitution of mechanical ventilation, as well as for occurrence of any
other complications. RWC length of stay on MV will be recorded.
Clinical characteristics including age, sex, anthropometrical data, APACHE II score,
Functional Independence Measure (FIM), Mini Mental State Examination (MMSE), Geriatric
Depression Scale (GDS), Mini Nutritional Assessment (MNA), temperature, ny concomitant
medications, hand grip strength will be recorded.
Expired tidal volume, respiratory rate, Peak airway pressure, mean airway pressure,
Compliance, Resistance, respiratory frequency to tidal volume ratio (f/Vt ), Negative
Inspiratory Pressure (NIP), Maximal Inspiratory Pressure (MIP), Minute Ventilation
(MV),inspiratory time will be recorded .
Other elements relevant to mechanical ventilation management include arterial blood gas
estimation, the number of changes in the settings of the ventilator performed by the health
care workers, the number of transitions from controlled to assisted ventilation, and the
number of apnea and high pressure alarms.
The primary outcome variables will be the duration of mechanical ventilation .
Discontinuation from MV will be attempted when the primary physician judges that the patient
is ready to be weaned, according to the standard criteria. Mechanical ventilation will be
reinstituted in the following circumstances: respiratory rate above 35 breaths /min, P02
below 65 mm Hg with FIO2less than 0.6, ph 7.34 or less, heart rate equal to or above 1 10
beats min or Increased by 20 % or more, or if arrhythmias appear, systolic blood pressure
without inotropes <90 mmHg or above 20% of usual blood pressure, uncoordinated
thoraco-abdominal movements, activation of accessory muscles, agitation or depressed mental
status, or excessive sweating.
A weaning trial will be considered a failure when the patient will be not tolerate the
weaning trial, patients still in the use CDW at day 60 and patients requires reconnection to
MV. Weaning trial will be considered successful if spontaneous breathing is sustained for
more than 168 h (7 days) after disconnection from MV .
;
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
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