Method of assessing pulmonary stress and a breathing apparatus
First Claim
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1. A method for assessing pulmonary stress, comprising the steps of:
- obtaining a volume of expired gas from a passively expiring subject;
measuring pressure in relation to said volume; and
assessing pulmonary stress of said subject by determining a profile of said pressure-volume relationship.
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Abstract
In a method for assessing pulmonary stress, a volume of respiratory gas is received from the lungs of a subject, an ensuing pressure is measured and the pressure-volume (P-V) relationship is analyzed. The analysis includes a determination of the profile of the pressure-volume (P-V) relationship. The profile is straight when no stress is present, convex when there is a risk for over-distension and concave when alveolar units are opened up. Implemented in a breathing apparatus the method can be used to assist an operator in diagnostic and therapeutic considerations in relation to a patient.
56 Citations
15 Claims
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1. A method for assessing pulmonary stress, comprising the steps of:
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obtaining a volume of expired gas from a passively expiring subject;
measuring pressure in relation to said volume; and
assessing pulmonary stress of said subject by determining a profile of said pressure-volume relationship. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A breathing apparatus comprising:
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a gas flow path adapted for connection to a respirating, passively expiring subject;
a gas regulator connected to said gas flow path, and a control unit for controlling said gas regulator dependent on at least one set parameter to regulate gas flow in said gas flow path;
a pressure gauge connected to said gas flow path for measuring pressure in said gas flow path;
a volume measuring arrangement connected to said gas flow path for measuring a volume of expired gas from said subject in said gas flow path; and
said control unit assessing pulmonary stress of said subject by determining a relationship between said pressure and said volume in said gas flow path, and assessing pulmonary stress of said subject by determining a profile of said pressure-volume relationship, and controlling said gas regulator dependent on said pulmonary stress. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification