Open Access Study protocol

Pulmonary perfusion with oxygenated blood or custodiol HTK solution during cardiac surgery for postoperative pulmonary function in COPD patients: a trial protocol for the randomized, clinical, parallel group, assessor and data analyst blinded Pulmonary Protection Trial

Katrine B Buggeskov1*, Jørn Wetterslev2, Niels H Secher3, Lars W Andersen4, Thomas Jonassen5 and Daniel A Steinbrüchel6

Author Affiliations

1 Department of Thoracic Anaesthesiology, Copenhagen University Hospital, Rigshospitalet, The Heart Centre dept. 4142, Blegdamsvej 9, 2100, Copenhagen, Denmark

2 Department of Cardiothoracic Surgery, Rigshospitalet, The Heart Centre dept. 2.15.2, Blegdamsvej 9, 2100, Copenhagen, Denmark

3 Department of Anaesthesiology, Rigshospitalet, Blegdamsvej 9, 2100, Copenhagen, Denmark

4 Department of Cardiothoracic Anaesthesiology, Rigshospitalet, The Heart Centre dept. 4142, The University of Copenhagen, Blegdamsvej 3, 2200, Copenhagen, Denmark

5 Department of Biomedical Sciences, Blegdamsvej 9, 2100, Copenhagen, Denmark

6 The Copenhagen Trial Unit, Rigshospitalet, Centre for Clinical Intervention Research, Blegdamsvej 9, 2100, Copenhagen, Denmark

For all author emails, please log on.

Trials 2013, 14:30  doi:10.1186/1745-6215-14-30

Published: 31 January 2013

Abstract

Background

Five to thirty percent of patients undergoing cardiac surgery present with chronic obstructive pulmonary disease (COPD) and have a 2- to 10-fold higher 30-day mortality risk. Cardiopulmonary bypass (CPB) creates a whole body systemic inflammatory response syndrome (SIRS) that could impair pulmonary function. Impaired pulmonary function can, however, be attenuated by pulmonary perfusion with oxygenated blood or custodiol HTK (histidine-tryptophan-ketoglutarate) solution.

Methods/Design

The Pulmonary Protection Trial (PP-Trial) randomizes 90 patients undergoing CPB-dependent cardiac surgery to evaluate whether pulmonary perfusion with oxygenated blood or custodiol HTK solution reduces postoperative pulmonary dysfunction in COPD patients. Further, we aim for a non-randomized evaluation of postoperative pulmonary function after transcatheter aortic-valve implantation (TAVI). The primary outcome measure is the oxygenation index measured from anesthesia induction to the end of surgery and until 24 hours after anesthesia induction for a total of six evaluations.

Discussion

Patients with COPD may be impaired by hypoxemia and SIRS. Thus, prolonged recovery and even postoperative complications and death may be reflected by the degree of hypoxemia and SIRS. The limited sample size does not aim for confirmatory conclusions on mortality, cardiovascular complications or risk of pneumonia and sepsis, but the PP-Trial is considered an important feasibility trial paving the road for a multicenter confirmatory trial.

Trial registration

ClinicalTrials.gov: NCT01614951.

Keywords:
Cardiopulmonary bypass; Inflammation; Systemic inflammatory response syndrome; Pulmonary function; Pulmonary perfusion; Pulmoplegia; Transcatheter aortic-valve implantation