A pragmatic randomised controlled trial to determine whether early Veno-Venous Extracorporeal Carbon Dioxide Removal (VV-ECCO2R) in mechanically ventilated patients with acute exacerbated Chronic Obstructive Pulmonary Disease decreases the days of invasive mechanical ventilation.
Chronic obstructive pulmonary disease (COPD) is a major worldwide health burden. Currently, it is the fourth leading cause of death worldwide, and is the only leading cause of death that is rising, and will likely become the third cause of death by 2020. COPD is characterized by progressive destruction in the elastic tissue within the lung, causing respiratory failure. Patients with COPD may experience acute exacerbations with severe hypercapnic respiratory failure. Hypercapnia results from acute worsening of expiratory flow limitation caused by the increased small airway resistance with consequent development of dynamic alveolar hyperinflation and intrinsic positive end-expiratory pressure (PEEP). In the most severe cases, these may be refractory to conventional therapies and mechanical ventilation, becoming life-threatening. Extracorporeal carbon dioxide removal (ECCO2R) represents an attractive approach in this setting. The last decade has seen an increasing interest in the provision of extracorporeal support for respiratory failure, as demonstrated by the progressively increasing number of scientific publications on this topic. In particular, remarkable interest has been focused on extracorporeal carbon dioxide removal (ECCO2R), due to the relative ease and efficiency in blood CO2 clearance granted by extracorporeal gas exchangers as compared to oxygen delivery. In recent years, a new generation of ECCO2R devices has been developed. More efficient veno-venous (VV)-ECCO2R devices have become available and have replaced the arterio-venous approach, having the advantage of not requiring arterial puncture. The new VV-ECCO2R devices offer lower resistance to blood flow, have smaller priming volumes, and provide a much more efficient gas exchange with relatively low extracorporeal blood flows (0.4-1 L/min). The technology of these devices is now comparable to that of renal dialysis and has been experimented in several animal and human studies, demonstrating a significant reduction in arterial CO2 and improvement in the work of breathing. In summary, minimally invasive ECCO2R appears very promising for patients with acute exacerbation of obstructive diseases refractory to conventional treatment, but systematic evaluation is needed to prove its clinical efficacy.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
90
Treatment with a medical device called ECCO2R. The device consists of a drainage cannula placed in a large central vein, a membrane lung (artificial gas exchanger), and a return cannula into the venous system. Blood is pumped through the membrane lung, and CO2 is removed by diffusion. A flowing gas known as "sweep gas" containing little or no CO2 runs along the other side of the membrane, ensuring a diffusion gradient from blood to the other side, hence promoting CO2 removal.
Invasive mechanical ventilation deviceto support acute respiratory failure and facilitate exhalation via an endotracheal tube or tracheotomy.
The amount of time in the first 28 days following randomization that a patient is free of ventilatory support including non-invasive ventilation
Statistically analyzed as Ventilator-Free Days during the 28 days from randomization (VFD-28)
Time frame: 28 days
All-cause (health-related) mortality at 28 and 90 days from randomization
Incidence of health-related deaths at 28 and 90 days from randomization, regardless of subject location at time of death.
Time frame: 28 and 90 days
Health-related quality of life (HRQoL)
EQ-5D-5L is a generic preference-based measure of health, which provides a description of health using five dimensions (mobility, self-care, usual activities, pain/discomfort and anxie-ty/depression) each with 5 levels of severity.
Time frame: 90 days after randomization
Catheter-related complications
Bleeding, malposition, dislodgement or kinking, infection, vascular occlusion, thrombosis, hematoma, aneurism, pseudoaneurysm formation
Time frame: Participants will be followed for the duration of ICU stay, an expected average of 30 days
Work of breathing
Assessed by respiratory rate (cutoff 30 breaths/min) and use of accessory muscles or paradoxical abdominal movements
Time frame: Participants will be followed for the duration of ICU stay, an expected average of 4 days
Time to ECCO2R cessation
Defined as from the onset of ECCO2R to 6 hours following cessation of CO2 removal
Time frame: Participants will be followed for the duration of ICU stay, an expected average of 4 days
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Length of ECCO2R in situ
Defined as the insertion of cannulas until there removal
Time frame: 7 days
Time to normalization of pH and PaCO2
Time frame: 3 hours
Length of ICU stay
Participants will be followed for the duration of ICU stay
Time frame: 4 days
Hospital Length of stay
Participants will be followed for the duration of hospital stay
Time frame: 10 days
Incidence of new tracheostomies
Incidence of new tracheostomies
Time frame: Within 28 days from randomization
Tolerance of ECCO2R therapy
Assessed by comfort, defined according a visual analog comfort scale (VAS). The VAS is a straight horizontal line of fixed length. The ends are defined as the extreme limits of the parameter to be measured (symptom,pain,health) orientated from the left (worst) to the right (best).
Time frame: 4 days
Dyspnea
Assessed by the modified Borg scale. This is a scale rates the difficulty of breathing. It starts at number 0 where dyspnea is causing no difficulty at all and progresses through to number 10 where dyspnea is maximal.
Time frame: 4 days
ICU Mobility
Ability of subject to mobilize in bed and out of bed while in Intensive Care as assessed using ICU Mobility Score (IMS)
Time frame: Randomization to end of treatment or 14 days, whichever is sooner
Incidence of failed extubations
Incidence of re-intubation within 48 hours of extubation for original exacerbation
Time frame: Within 28 days from randomization
Frailty Index Score
The Clinical Frailty Scale is scored on a scale from 1 (very fit) to 9 (terminally ill) and is based on clinical judgment.
Time frame: 90 days after randomization