System and method for efficiently distinguishing among cardiac ischemia, hypoglycemia and hyperglycemia using an implantable medical device and an external system
US7756572B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2007 |
| Grant date | Jul 13, 2010 |
| Priority date | — |
| Expiry date | Dec 5, 2028 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/36557
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Techniques are described for efficiently detecting and distinguishing among cardiac ischemia, hypoglycemia or hyperglycemia based on intracardiac electrogram (IEGM) signals. In one example, a preliminary indication of an episode of cardiac ischemia is detected based on shifts in ST segment elevation within the IEGM. In response, the implanted device then records additional IEGM data for transmission to an external system. The external system analyzes the additional IEGM data to confirm the detection of cardiac ischemia using a more sophisticated analysis procedure exploiting additional detection parameters. In particular, the external system uses detection parameters capable of distinguishing hypoglycemia, hyperglycemia and hyperkalemia from cardiac ischemia, such as QTmax and QTend intervals. Alternatively, the more sophisticated analysis procedure may be performed by the device itself, if it is so equipped. Other examples described herein pertain instead to the detection of atrial fibrillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.