In one implementation, a method is provided for detecting heart failure which includes retrieving a three-dimensional posture template corresponding to a normal evoked response. The method further includes capturing an intracardiac electrogram of an evoked response and detecting a three-dimensional posture corresponding with the intracardiac electrogram. The detected three-dimensional posture and the three-dimensional posture template are compared. The captured intracardiac electrogram is used for heart failure trend analysis if the comparison of the detected three-dimensional posture and the three-dimensional posture template indicates a same posture.