A comparison of the effectiveness of open and closed endotracheal suction

• Published in: Intensive care medicine 2007-09, Vol.33 (9), p.1655-1662
• Main Authors: COPNELL, Beverley, TINGAY, David G, KIRALY, Nicholas J, SOURIAL, Magdy, GORDON, Michael J, MILLS, John F, MORLEY, Colin J, DARGAVILLE, Peter A
• Format: Article
• Language: English
• Subjects: Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy; Animals; Artificial respiration; Biological and medical sciences; Blood. Blood and plasma substitutes. Blood products. Blood cells. Blood typing. Plasmapheresis. Apheresis; Care and treatment; Catheters; Comparative analysis; Contrast Media - administration & dosage; Contrast Media - isolation & purification; Critical Care; Emergency and intensive respiratory care; Fluoroscopy; Health aspects; Intensive care; Intensive care medicine; Intubation, Intratracheal - methods; Iopamidol - administration & dosage; Iopamidol - isolation & purification; Lung - diagnostic imaging; Lung diseases; Lung Injury; Medical research; Medical sciences; Models, Animal; Mucins - analysis; Ostomy; Pediatrics; Performance evaluation; Rabbits; Random Allocation; Respiration; Respiration, Artificial; Suction (Medical care); Suction - methods; Suctioning; Therapeutic Irrigation; Tracheotomy; Transfusions. Complications. Transfusion reactions. Cell and gene therapy; Ventilators
• ISSN: 0342-4642; 1432-1238
• DOI: 10.1007/s00134-007-0635-x

To compare the effectiveness of open and closed endotracheal suction in recovering thin and thick secretions in normal and injured lungs during conventional and high frequency ventilation. Randomised study in a paediatric intensive care model in the animal research laboratory of a tertiary paediatric hospital. 16 New Zealand White rabbits. Anaesthetised animals were intubated with a 3.5-mm endotracheal tube. Simulated thin and thick secretions (iopamidol 2 ml, a watery radio-opaque fluid, and fluorescent mucin 1 ml) were instilled in turn 1 cm below the tube tip through a catheter placed via a tracheostomy. Open or closed suction, randomly assigned, was applied for 6s at -140 mmHg using a 6-F gauge catheter. Following lung injury with repeated saline lavage the procedure was repeated on conventional and high frequency ventilation. Iopamidol recovery was determined by digitally subtracting the post-contrast and post-suction radiographic images. Mucin recovery was determined by fluorescence assay of the aspirate. In the normal lung similar amounts were recovered by both suction methods. In the lavaged lung closed suction recovered less iopamidol during conventional (22 +/- 7.5%) and high frequency ventilation (11 +/- 2.4%) than open suction (36 +/- 2% and 22 +/- 8.1%, respectively). Mucin recovery was less with closed suction during conventional 32 +/- 28 microl) and high frequency ventilation (30 +/- 31 microl) than with open suction (382 +/- 235 microl and 24 +/- 153 microl). In the injured lung closed suction was less effective than open suction at recovering thin and thick simulated secretions, irrespective of ventilation mode.