Is roller pump induced tubing rupture a clinical possibility?
We analyzed the effects of variations in the diameter of silicone rubber and polyvinyl chloride (PVC) tubings on the likelihood of tubing rupture during modeling of accidental arterial line clamping in cardiopulmonary bypass (CPB) with a roller pump. A closed CPB circuit constructed with a roller pump was tested with both PVC and silicone rubber tubings of 1/2, 3/8, and 1/4 inch internal diameter. Arterial line pressure was monitored, and an occlusive clamp was placed across the tubing distal to the pressure monitor site to model an accidental arterial line occlusion. A charge coupled device camera with 512 (horizontal) x 492 (vertical) pixels was installed above the roller pump to measure tubing diameters at pump outlet where the maximum deformations (distension) of the tubings occurred. Quantitative measurement of the changes of tubing diameters with the change of arterial line pressure was performed using computerized image processing techniques. A visible change of tubing diameter was generally noticeable by around 250 psi of arterial line pressure, which was already very high. By 1,500 psi, the PVC tubings showed an increase of diameter between 5% to 10% while the silicone rubber tubings showed an increase between 20% to 25%. Silicone rubber tubings of all sizes showed greater distensibility than PVC tubings of equivalent size. In conclusion, although roller pump induced tubing rupture remains a theoretical problem during CPB in terms of the inherent mechanism of the pump, in reality such an occurrence is impossible in real clinical conditions.
Kim
Won Gon
WG
Department of Thoracic and Cardiovascular Surgery and Heart Research Institute, Seoul National University College of Medicine, Seoul, Korea.
Chung
Chan Il
CI
Cho
Sang Rock
SR
D001794:Blood Pressure / Q000502:physiology*; D001807:Blood Vessel Prosthesis; D002315:Cardiopulmonary Bypass / Q000009:adverse effects*; D003250:Constriction; D006801:Humans; D019563:Mechanics; D011143:Polyvinyl Chloride; D011475:Prosthesis Failure; D012422:Rupture, Spontaneous / Q000209:etiology; D012826:Silicone Elastomers
D012826:Silicone Elastomers; D011143:Polyvinyl Chloride