Biomaterial Database

Dynamics of venturi jet ventilation through the operating laryngoscope. 1982

P Woo, and S Eurenius

Venturi jet ventilation with the oxygen injector needle placed within the lumen of the laryngoscope was studied systematically in two dogs undergoing repeated general anesthesia suspension laryngoscopy. Using a total body plethysmograph, the effect of changes of needle angle, position and its effect on tidal volume delivery were measured. The changes of pressure regulator, flow rate and needle size were correlated with the volume delivery. Intratracheal pressure during Venturi ventilation was measured. Correlation of arterial blood gases and minute ventilation with the system was done. While ventilatory capacity is able to be achieved predictably, there are many variables. Optimal placement of the needle tip for maximum safety and efficiency appears to be at the midthird or lower third of the laryngoscope. It is important to center the needle axis to the laryngoscope axis. Other parameters subject to choice are the selection of needle size, regulator pressure setting and flow rate setting. By first selecting the correct needle size that will hyperinflate the subject, the pressure regulator can then be reduced to achieve ventilatory volumes similar to spontaneous tidal volumes. In prolonged use, the Venturi system was able to provide excellent ventilation safely and predictably.

UI	MeSH Term	Description	Entries
D007828	Laryngoscopy	Examination, therapy or surgery of the interior of the larynx performed with a specially designed endoscope.	Laryngoscopic Surgical Procedures,Surgical Procedures, Laryngoscopic,Laryngoscopic Surgery,Surgery, Laryngoscopic,Laryngoscopic Surgeries,Laryngoscopic Surgical Procedure,Laryngoscopies,Procedure, Laryngoscopic Surgical,Procedures, Laryngoscopic Surgical,Surgeries, Laryngoscopic,Surgical Procedure, Laryngoscopic
D008176	Lung Volume Measurements	Measurement of the amount of air that the lungs may contain at various points in the respiratory cycle.	Lung Capacities,Lung Volumes,Capacity, Lung,Lung Capacity,Lung Volume,Lung Volume Measurement,Measurement, Lung Volume,Volume, Lung
D009339	Needles	Sharp instruments used for puncturing or suturing.	Hypodermic Needles,Hypodermic Needle,Needle,Needle, Hypodermic,Needles, Hypodermic
D011312	Pressure	A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Pressures
D012121	Respiration, Artificial	Any method of artificial breathing that employs mechanical or non-mechanical means to force the air into and out of the lungs. Artificial respiration or ventilation is used in individuals who have stopped breathing or have RESPIRATORY INSUFFICIENCY to increase their intake of oxygen (O2) and excretion of carbon dioxide (CO2).	Ventilation, Mechanical,Mechanical Ventilation,Artificial Respiration,Artificial Respirations,Mechanical Ventilations,Respirations, Artificial,Ventilations, Mechanical
D001784	Blood Gas Analysis	Measurement of oxygen and carbon dioxide in the blood.	Analysis, Blood Gas,Analyses, Blood Gas,Blood Gas Analyses,Gas Analyses, Blood,Gas Analysis, Blood
D004285	Dogs	The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)	Canis familiaris,Dog
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D020704	Laryngoscopes	Endoscopes for examining the interior of the larynx.	Laryngoscope