McGill Case 66: Difference between revisions

McGill Case 66 (view source)

357 bytes added , 15 February 2012

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-[[File:E0007661.jpg|thumb|600px|left|These are two electrocardiograms from a patient complaining of a fast heart rate and high blood pressure (taken at a friends). The patient looked well but did have a blood pressure of 180/120mm.
+[[File:E0007661.jpg|thumb|600px|left|This is an interesting set of tracings, as it shows the effect of adenosine on AV conduction, but in addition the effect on atrial refractoriness.
-The first tracing was in on arrival in the emmergence room, the second after receiving 12 mg of adenosine by rapid intravenous injection.
+The first tracing is clearly atrial flutter with an atrial rate of 270/min, and a ventricular rate of 135/min. The second recording shows much faster atrial activity (Note the distance between the turquoise arrows and the yellow arrows which mark out 3 atrial cycles). The second tracing is either atrial fibrillation (a know result of adenosine) or a faster atrial flutter (type II flutter) with variable block. Both of these effects could be seen as a result of the decrease in the atrial refractory period by the stimulation of the adenosine.]]
-}.]]
 [[File:E0007662.jpg|thumb|600px|left|]]