Premium
Bronchoscopic suctioning may cause lung collapse: a lung model and clinical evaluation
Author(s) -
LINDGREN S.,
ODENSTEDT H.,
ERLANDSSON K.,
GRIVANS C.,
LUNDIN S.,
STENQVIST O.
Publication year - 2008
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.2007.01499.x
Subject(s) - medicine , functional residual capacity , suction , tidal volume , ventilation (architecture) , anesthesia , pulmonary compliance , mechanical ventilation , tracheal tube , lung volumes , airway , lung , intensive care , peak inspiratory pressure , surgery , respiratory system , intensive care medicine , mechanical engineering , engineering
Objective: To assess lung volume changes during and after bronchoscopic suctioning during volume or pressure‐controlled ventilation (VCV or PCV). Design: Bench test and patient study. Participants: Ventilator‐treated acute lung injury (ALI) patients. Setting: University research laboratory and general adult intensive care unit of a university hospital. Interventions: Bronchoscopic suctioning with a 12 or 16 Fr bronchoscope during VCV or PCV. Measurements and results: Suction flow at vacuum levels of −20 to −80 kPa was measured with a Timeter ™ instrument. In a water‐filled lung model, airway pressure, functional residual capacity (FRC) and tidal volume were measured during bronchoscopic suctioning. In 13 ICU patients, a 16 Fr bronchoscope was inserted into the left or the right main bronchus during VCV or PCV and suctioning was performed. Ventilation was monitored with electric impedance tomography (EIT) and FRC with a modified N 2 washout/in technique. Airway pressure was measured via a pressure line in the endotracheal tube. Suction flow through the 16 Fr bronchoscope was 5 l/min at a vacuum level of −20 kPa and 17 l/min at −80 kPa. Derecruitment was pronounced during suctioning and FRC decreased with −479±472 ml, P <0.001. Conclusions: Suction flow through the bronchoscope at the vacuum levels commonly used is well above minute ventilation in most ALI patients. The ventilator was unable to deliver enough volume in either VCV or PCV to maintain FRC and tracheal pressure decreased below atmospheric pressure.