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Method and apparatus for indicating the absence of a pulmonary embolism in a patient

  • US 20070129646A1
  • Filed: 12/02/2005
  • Published: 06/07/2007
  • Est. Priority Date: 12/02/2005
  • Status: Active Grant
First Claim
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1. :

  • A method for determining an embolic condition of a patient, said method comprising the steps of;

    (a) measuring the amount of CO2 expired by the patient during the expiration of breathing gases by the patient;

    (b) measuring the volume (V) of breathing gases expired during the expiration of breathing gases by the patient;

    (c) determining a relationship between changes in the amount of expired CO2 and a change in breathing gas volume in an alveolar expiration phase of patient expiration;

    (d) measuring an amount of CO2 in the lungs of the patient at the end of expiration;

    (e) measuring the amount of CO2 in the blood of the patient;

    (f) determining the difference between the amount of CO2 in the blood and the amount of CO2 in the lungs of the patient at the end of expiration; and

    (g) establishing a relationship between the determination of step (f) and the determination of step (c) to produce a quantity for use in determining the embolic condition of the patient.

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