File:E290.jpg: Difference between revisions

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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

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Camera manufacturer	HP
Camera model	HP Scanjet G3110
Date and time of data generation	23:31, 2 May 2009
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Horizontal resolution	72 dpi
Vertical resolution	72 dpi
Software used	Adobe Photoshop CS5 Windows
File change date and time	06:09, 21 February 2012
Y and C positioning	Co-sited
Pair of black and white reference values	0 255 128 255 128 255
Exif version	2.2
Meaning of each component	Y Cb Cr does not exist
Supported Flashpix version	1
Color space	sRGB
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Date and time of digitizing	23:31, 2 May 2009
Date metadata was last modified	14:09, 21 February 2012
Unique ID of original document	4856E29C11D40F15A9CCD45DD9942DDA
Copyright status	Copyright status not set

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+== Summary ==
+{{Information
+|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_from_Michael_Rosengarten|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 = {{by-nc-sa-3.0}}
+|other_versions = None
+}}