| http://www.w3.org/ns/prov#value | - Impeding airflow to the patient's lungs may be accomplished by any flow restrictive element such as an orifice, a one-way valve, a spring biased or other valve which is set to open when the negative intrathoracic pressure is in the range from about 0 cm H2 O to -100 cm H2 O, and more preferably from about -3 cm H2 O to about -30 cm H2 O. A valve designed to open at a threshold pressure value may b
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