Chronic Obstructive Pulmonary Disease Clinical Trial
The clinical course of chronic obstructive pulmonary disease (COPD) is associated with recurrent episodes of exacerbation that results in respiratory failure. The treatment of respiratory failure is supportive and involves inhalation bronchodilators along with systemic steroids. In few cases the management of acute respiratory failure requires positive pressure ventilation (non-invasive or invasive). The use of NIV in acute exacerbation of COPD has resulted in significant reduction in morbidity and mortality. Although pressure support ventilation (PSV) allows the patient to influence the breathing pattern, ventilator-cycling criteria may worsen the patient-ventilator interaction, and severe asynchronies occur in up to 43% of patients undergoing NIV for ARF. Adaptive support ventilation (ASV) is a newer mode of ventilation that incorporates feedback mechanisms and thus provides a stable minute ventilation. We hypothesize that the use of ASV as a mode during ventilation using NIV in patients with acute exacerbation of COPD may result in reducing the duration of ventilatory support, need for intubation, and duration of intensive care unit (ICU) and hospital length of stay, when compared with PSV mode of NIV ventilation.
Chronic obstructive pulmonary disease (COPD) is a common respiratory disease, which is
characterized by airflow limitation. It affects more than 3.49 per cent of adults >35 year
and is associated with high morbidity and mortality. The national burden of chronic
bronchitis is estimated at 14.84 million.
The clinical course of COPD is punctuated by acute exacerbations, which can lead to
hypercapnic respiratory failure. The development of respiratory failure is associated with
high morbidity and mortality, and significant healthcare costs. The requirement of
ventilatory support also portends a reduced survival in this group of patients.
The introduction of non-invasive ventilation (NIV) has resulted in a paradigm shift in the
management of patients with acute exacerbation of COPD. First, reported in 1989, by Meduri et
all, the successful application of NIV via full-face mask in 10 patients, and the avoidance
of intubation in 8 of them (4 of 6 with COPD, 2 of 2 with congestive heart failure, and 2 of
2 with pneumonia), demonstrated the efficacy of NIV in the management of acute exacerbation
of COPD. This new modality was successful in avoiding of many of the complications associated
with invasive mechanical ventilation.
Traditionally, NIV is instituted with the pressure support mode of ventilation. Wherein, the
inspiratory pressure was initiated at 6-8 cm of water and expiratory pressure was set at 3-4
cm. The difference between the two pressures provided the ventilatory support. These
pressures were then titrated based on patient clinical improvement by the physician.
Adaptive support ventilation (ASV) is one of the newer modes of ventilation, described by
Tehrani et al in 1991 and was designed to minimise the work of breathing, mimic natural
breathing and stimulate breathing and reduce weaning time. It is a closed loop system, which
incorporates various feedback mechanisms into its algorithm. The operator inputs patients
weight, from that the ventilator calculates required minute alveolar ventilation assuming
normal dead space fraction. Then an optimal frequency is calculated based on Otis equation.
The target tidal volume is calculated by MV/f. The inspiratory pressure within a breath is
controlled to achieve a constant value and between the breaths the inspiratory pressure is
adjusted to achieve a target tidal volume. It aims to provide a target minute ventilation by
adjusting automatically the delivered pressure and respiratory rate while keeping the work of
breathing to a minimum by the patient.
Due to its ability to reduce the work of breathing and meet the flow requirement of the
patient by adjusting both the flow and respiratory rate depending on the respiratory
mechanics, the use of ASV as a mode of ventilation during NIV may improve patient-ventilator
synchrony. A study comparing ASV versus pressure support ventilation in intubated patients
with acute exacerbation of COPD demonstrated that the use of ASV mode was associated with
shorter weaning times with similar weaning success rates. However, a study comparing the use
of ASV mode versus PSV mode during non-invasive ventilation has not been done previously.
Patient-ventilator synchronization is critical for reducing the work of breathing and for
successful NIV. Although PSV allows the patient to influence the breathing pattern,
ventilator-cycling criteria may worsen the patient-ventilator interaction, and severe
asynchronies occur in up to 43% of patients undergoing NIV for ARF. We hypothesize that the
use of ASV as a mode during ventilation using NIV in patients with acute exacerbation of COPD
may result in reducing the duration of ventilatory support, need for intubation, and duration
of intensive care unit (ICU) and hospital length of stay, when compared with PSV mode of NIV
ventilation.
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