Journal of cardiothoracic and vascular anesthesia
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J. Cardiothorac. Vasc. Anesth. · Aug 1997
Comparative StudyA comparison of two different bronchial cuff designs and four different bronchial cuff inflation methods.
To compare directly measured pressures at the cuff/trachea interface that are associated with two different bronchial cuff designs and four different methods of bronchial cuff inflation suggested for use with one-lung ventilation. ⋯ To achieve lung separation with the lowest pressure on the trachea, the new test is the most appropriate method for use with the double-lumen tube; however, the negative-pressure test appeared to be the easiest and fastest method for use with the bronchial blocker. Although the bronchial blocker was associated with lower pressures transmitted from the cuff to the trachea, the in vitro model cannot predict which bronchial cuff design would be superior in vivo.
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J. Cardiothorac. Vasc. Anesth. · Aug 1997
Topical ice slurry prevents brain rewarming during deep hypothermic circulatory arrest in newborn sheep.
To measure the effect of ice slurry topical cooling on brain surface temperature during deep hypothermic circulatory arrest. ⋯ Topical cooling of the head with ice slurry in newborn lambs lowers brain surface temperature during deep hypothermic circulatory arrest. Surrogate temperature monitoring locations such as nasopharyngeal and rectal temperatures varied significantly and do not accurately reflect changes in brain surface temperature.
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J. Cardiothorac. Vasc. Anesth. · Aug 1997
The effects of cardiopulmonary bypass on total and unbound plasma concentrations of propofol and midazolam.
To examine the effects of cardiopulmonary bypass (CPB) on total and unbound plasma concentrations of propofol and midazolam when administered by continuous infusion during cardiac surgery. ⋯ Unbound concentrations of propofol and midazolam are not affected by cardiopulmonary bypass. Total intravenous anesthesia algorithms do not need to be changed to achieve stable unbound plasma concentrations when initiating CPB.
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J. Cardiothorac. Vasc. Anesth. · Aug 1997
The effects of endobronchial cuff inflation on double-lumen endobronchial tube movement after lateral decubitus positioning.
This study was designed to measure changes in tracheal and bronchial lumen distances from mainstem and secondary carina with lateral positioning, and to assess whether inflation of the endobronchial cuff before lateral positioning would further secure a double-lumen endobronchial tube (DLT) and reduce movement. ⋯ DLTs move with lateral positioning, regardless of endobronchial cuff inflation. The movement is predominantly in the upward direction. Therefore, fiberoptic visualization in the supine position should be used only to confirm that the endobronchial lumen is placed on the appropriate side and the cuff is at least 1 cm inside the left mainstem bronchus. Final positioning should always be verified in the lateral position.
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J. Cardiothorac. Vasc. Anesth. · Jun 1997
Randomized Controlled Trial Clinical TrialEffect of pump flow rate on cerebral blood flow during hypothermic cardiopulmonary bypass in adults.
The purpose of this study was to examine the effect of cardiopulmonary bypass flow rate on cerebral blood flow and cerebral metabolic rate for oxygen during hypothermic (27 degrees C) cardiopulmonary bypass. ⋯ Brain oxygenation is well maintained at lower than conventional pump flow levels during CPB. There may be practical advantages to reduced flows during hypothermia, and flow reductions do not appear to adversely affect cerebral blood flow or metabolism.