Method and apparatus for the measurement of atrial pressure

A - Human Necessities – 61 – B

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A61B 5/03 (2006.01) A61B 5/0215 (2006.01)

Patent

CA 2111094

A non-invasive apparatus for obtaining a quantitative determination of mean left atrial pressure comprises a balloon (24) to be inserted by means of a catheter (20) into the esophagus (26) and positioned adjacent the left atrium. As the balloon is gradually inflated, a tracing of mean balloon pressure is obtained. In addition, a tracing of balloon pressure on a steady baseline and with low frequency oscillations due to respiration filtered out is obtained whereby the tracing represents balloon pressure oscillations effected by left atrial pressure. In accordance with the oscillometric principle the mean balloon pressure is measured at the time when the amplitude of the balloon pressure oscillations effected by the left atrial pressure is at a peak. This mean balloon pressure is indicative of approximate mean left atrial pressure. Mean left atrial transmural pressure may be determined by subtracting therefrom the mean esophageal pressure as measured at a position in the esophagus where it is unaffected by the heart.

Appareil non invasif destiné à obtenir une détermination quantitative de la pression auriculaire gauche moyenne, qui comprend un ballonnet (24) à introduire dans l'oesophage (26) au moyen d'un cathéter (20) et à placer près de l'oreillette gauche. On gonfle petit à petit le ballonnet et on recueille un tracé de la pression moyenne du ballonnet. En outre, on obtient un tracé de la pression du ballonnet sur une ligne de base constante et avec des oscillations de basse fréquence grâce au filtrage de la respiration, ledit tracé représentant les oscillations de la pression du ballonnet provoquées par la pression auriculaire gauche. Conformément au principe oscillométrique, la pression moyenne du ballonnet est mesurée au moment où l'amplitude des oscillations de la pression du ballonnet provoquées par la pression auriculaire moyenne se trouve à une crête. Cette pression moyenne du ballonnet indique la pression auriculaire gauche moyenne approximative. La pression transmurale auriculaire gauche moyenne peut être déterminée en soustrayant de ladite pression la pression oesophagienne moyenne mesurée à une position de l'oesophage où elle n'est pas influencée par le coeur.

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