Method and system for measuring changes in inspiratory load
AssigneeSt. Michael's Hospital
InventorsChrister Sinderby, Jennifer Beck
Life of this patent
Estimating the term…
Abstract
A method and system for measuring changes in inspiratory load of a patient's respiratory system during mechanical ventilation. The method and system calculate a first relation between a measured inspiratory airway pressure and a measured electrical activity of respiratory muscle, and a second relation between a measured inspiratory volume and the measured electrical activity. A load index is calculated from the first and second relations. Changes in inspiratory load are determined based on the load index.
Claims16
A method for measuring changes in inspiratory load imposed on a patient's respiratory system, comprising:
- measuring electrical activity (EAim and EAimocc) of at least one respiratory muscle of the patient;
- measuring an inspiratory volume (Vt);
- measuring an inspiratory airway pressure (Pawocc) for an occluded airway;
- calculating a first relation between the measured inspiratory airway pressure and the measured electrical activity EAimocc;
- calculating a second relation between the measured inspiratory volume and the measured electrical activity EAim;
- calculating a load index from the first and second relations;
- determining changes in inspiratory load imposed on the patient's respiratory system in relation to the load index.
A system for measuring changes in inspiratory load imposed on a patient's respiratory system, comprising:
- means for measuring electrical activity (EAim and EAimocc) of at least one respiratory muscle of the patient;
- means for measuring an inspiratory volume (Vt);
- means for measuring an inspiratory airway pressure (Pawocc) for an occluded airway;
- means for calculating a first relation between the measured inspiratory airway pressure and the measured electrical activity EAimocc;
- means for calculating a second relation between the measured inspiratory volume and the measured electrical activity EAim;
- means for calculating a load index from the first and second relations;
- means for determining changes in inspiratory load imposed on the patient's respiratory system in relation to the load index.
A system for measuring changes in inspiratory load imposed on a patient's respiratory system using a measured electrical activity (EAim and EAimocc) of at least one respiratory muscle of the patient, a measured inspiratory volume (Vt), and a measured inspiratory airway pressure (Pawocc) obtained during airway occlusion, the system comprising:
- a calculator of a first relation between the measured inspiratory airway pressure and the measured electrical activity EAimocc;
- a calculator of a second relation between the measured inspiratory volume and the measured electrical activity EAim;
- a calculator of a load index from the first and second relations;
- and
- a calculator of changes in inspiratory load imposed on the patient's respiratory system in relation to the load index.
Dependencies are inferred from the claim text.