System and method for discriminating acute and chronic heart failure using an implantable medical device
US7899522B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2006 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Jan 22, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/37282
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.