Abstract
SummaryHigh speed color motion pictures of the heart in 10 dogs have shown rapid phasic color changes in the right atrium which alternate between red and cyan with each cardiac cycle. Frame by frame measurement of color at 10 msec intervals throughout one cardiac cycle in one dog has shown a major red peak beginning approximately 195 msec after the onset of the P wave. Although the cause of these color changes is not yet known, they may result from phasic changes in coronary arterial flow through the atrial wall.
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