Implantable cardiac rhythm management device for assessing status of CHF patients
US6275727A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1999 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Nov 4, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3627
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for providing congestive heart failure therapy status. An electronic device, preferably a cardiac rhythm management device, capable of measuring transthoracic impedance and for sensing a level of physical activity is implanted in a patient. The transthoracic impedance signal is processed to obtain an estimate of the subject's minute ventilation, respiratory rate and tidal volume. From accelerometer measured activity, an estimate is obtained of oxygen uptake and carbon dioxide production. Ratios of tidal volume to respiratory rate, tidal volume to inspiratory time, minute ventilation to carbon dioxide production and oxygen uptake to heart rate are meaningftil status indicators for assessing the efficacy of particular therapy regimens to CHF patients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.