File:E290.jpg

From ECGpedia
Revision as of 07:30, 21 February 2012 by DarrelC (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

Original file(3,004 × 1,083 pixels, file size: 499 KB, MIME type: image/jpeg)

Summary

Description

The cardiogram illustrates the determination of the atrial capture threshold. The pacemaker is decrementing down the atrial amplitude as marked below the atrial pacer spikes. note the loss of atrial capture after the second spike of 1.5 volts. Loss of capture is illustrated by three events, 1) the lack of a p wave after the spike, 2) the appearance of a native p wave after the failure to capture and 3) the change in the RR intervals as the QRS is no longer following the paced P wave. The lack of capture after the second 1.5 volt complex illustrates a component of time dependent capture where after a while a stimulus may fail to capture even thought the amplitude is kept constant.

Category

Case reports by Michael Rosengarten

Source

EKG World Encyclopedia http://cme.med.mcgill.ca/php/index.php , courtesy of Michael Rosengarten BEng, MD.McGill

Date

2012

Author

Michael Rosengarten BEng, MD.McGill

Permission

Creative Commons Attribution Noncommercial Share-Alike License

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current07:29, 21 February 2012Thumbnail for version as of 07:29, 21 February 20123,004 × 1,083 (499 KB)DarrelC (talk | contribs)
  • You cannot overwrite this file.

The following page uses this file:

Metadata