Patent ID: 8750995
Filing Date: 2014-06-10
Classification: A61B,A61N

Abstract:
1. A heart monitoring device for indicating congestive heart failure (CHF), comprising: a processor; a sensor configured to interact in vivo with a subject to sense IEGM (intracardiac electrogram) signals, in each of a plurality of different heart cycles, at least two heart events during one heart cycle at different locations of the heart, and to emit respective IEGM signals for each of said plurality of different heart cycles, representing said at least two heart events; said processor being configured to obtain said IEGM signals as an input to said processor from said sensor; said processor being configured to determine a heart time interval between said at least two heart events for a first of said plurality of different heart cycles and to calculate a first variability measure therefrom that measures a variation between said heart time interval in said first of said heart cycles and said heart time interval in at least another heart cycle, and to determine a first CHF indicator value, representing a degree of CHF of said subject, from said first variability measure; said processor being configured to determine a heart time interval between said at least two heart events for a second of said plurality of different heart cycles and to calculate a second variability measure therefrom that measures a variation between said heart time interval in said second of said heart cycles and said heart time interval in at least another heart cycle, and to determine a second CHF indicator value, representing said degree of CHF of said subject, from said second variability measure and to determine a trend of said degree of CHF of said subject dependent on a relationship between said first CHF indicator value and said second CHF indicator value; and each of said first variability measure and said second variability measure being selected from the group consisting of a standard deviation of, a mean of the standard deviation of, and a difference between, the respective heart time intervals; and said processor being configured to generate a processor output signal, at an output of said processor, representing said trend.