System and method for discriminating acute and chronic heart...

Details System and method for discriminating acute and chronic heart... System and method for discriminating acute and chronic heart...

2011-03-01

2011-03-01

Layno, Carl H (Department: 3766)

Surgery

Diagnostic testing

Cardiovascular

C600S508000, C600S547000

Reexamination Certificate

active

07899522

ABSTRACT:
Techniques are provided for evaluating heart failure within a patient. In one example, the implantable device detects a decrease, if any, in selected morphological parameters derived from the intracardiac electrogram (IEGM) that are indicative of possible heart failure, such as paced depolarization integrals (PDI) or peak-to-peak amplitudes of QRS-complexes. The device also detects a decrease, if any, in transthoracic impedance, which is also indicative of possible heart failure. Acute heart failure is indicated if there is a decrease in the morphological IEGM parameters but no significant decrease in transthoracic impedance. Chronic heart failure is indicated if there is a decrease in transthoracic impedance but no significant decrease in the morphological IEGM parameters. If both transthoracic impedance and the morphological IEGM parameters are found to be decreasing significantly, the device issues a warning of severe heart failure.

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