Transtracheal ventilation with oscillatory pressure for complete upper airway obstruction.
Another study documented that percutaneous transtracheal ventilation with a special 3.5-mm I.D. cannula was possible in experimental complete upper airway obstruction (CAO) using Ambu-assisted ventilation. The effects of ventilation during CAO by occlusion of the endotracheal tube was evaluated by use of a portable oscillatory pressure device (POPD) attached to a 10-g (I.D. 2.4 mm) angiocath catheter inserted through the tracheal wall. Eight pigs were anesthetized and ventilated with the POPD for 15 minutes after CAO with a mean peak airway pressure of 14 cm H2O and continuous positive airway pressure of 5-7 cm H2O, tidal volume below 100 ml, and a rate below 0.5 Hz. A Venturi delivered an FIO2 of 0.68-0.92. All eight showed markedly stable blood gases and cardiovascular parameters (heart rate and systemic and pulmonary arterial pressures). A similar trend was obtained in a separate group of four pigs ventilated with an Ambu bag for 30 minutes; however, the PO2 was lower. In the control group, asphyxia after CAO produced cardiorespiratory failure in every animal in less than 6 minutes. Low-frequency ventilation with a POPD for CAO ensures adequate gas exchange using a standard transtracheal catheter of only 2.4 mm I.D.
Goldman
E
E
Department of Anesthesiology, Ohio State University College of Medicine, Columbus 43210.
McDonald
J S
JS
Peterson
S S
SS
Stock
M C
MC
Betts
R
R
Frolicher
D
D
D000402:Airway Obstruction / Q000503:physiopathology / Q000628:therapy*; D000818:Animals; D001794:Blood Pressure; D004867:Equipment Design; D006339:Heart Rate; D007442:Intubation, Intratracheal / Q000295:instrumentation*; D011175:Positive-Pressure Respiration / Q000295:instrumentation*; D011659:Pulmonary Gas Exchange; D013552:Swine