Bradycardia Ischemia Pacemaker 
Dr. Smith's ECG Blog
MAY 5, 2023
My thoughts were the following: ECGs #1 and #2 showed a completely unreliable sinus pacemaker, with presumed high-grade 2nd-degree AV block — and frequent resultant pauses of over 2 seconds ( that would have been even longer had it not been for intermittent relief from the atrial escape focus ). What Does this All Mean?
Dr. Smith's ECG Blog
NOVEMBER 9, 2018
I tell the residents: "The pacemaker is just common sense: if there is no beat, it provides one; if there is one, it keeps itself from pacing." This is similar to Ken Grauer's comment at the bottom: "What would I do if I were a pacemaker?" This made me realize that pacemaker function is not as well understood as I thought.
Ken Grauer, MD
OCTOBER 4, 2024
To improve visualization — I've digitized the original ECG using PMcardio ) MY Thoughts on the ECG in Figure-1: This is a challenging tracing to interpret — because there is marked bradycardia with an irregular rhythm and a change in QRS morphology. Figure-1: The initial ECG in today's case. ( The QRS complex is wide ( ie, >0.10
Dr. Smith's ECG Blog
MARCH 22, 2024
I will leave more detailed rhythm discussion to the illustrious Dr. Ken Grauer below, but this use of calipers shows that the rhythm interpretation is: Sinus bradycardia with a competing (most likely junctional) rhythm. The fact that R waves 2 through 6 are junctional does make ischemia more difficult to interpret -- but not impossible.
Ken Grauer, MD
JUNE 2, 2023
to 1828 msec. ) — which corresponds to a variation in the rate of sinus bradycardia from 36-to-33/minute. This makes sense given that the underlying rhythm in today's case appears to be marked sinus bradycardia and arrhythmia , with a ventricular escape rhythm appearing when the SA node rate drops below 33/minute.
Dr. Smith's ECG Blog
JULY 21, 2024
There is no definite evidence of acute ischemia. (ie, Simply stated — t he patient was having recurrent PMVT without Q Tc prolongation, and without evidence of ongoing transmural ischemia. ( Some residual ischemia in the infarct border might still be present. Both episodes are initiated by an "R-on-T" phenomenon.
Wellnest
DECEMBER 21, 2022
A fast heartbeat is called tachycardia, while a slow heartbeat is called bradycardia in medical terms. Poor blood supply Ischemia, or inadequate blood supply to the heart, is an abnormality that can be detected in an ECG test. ECG testing is also carried out to see how medicines work during treatment and the pacemaker's functioning.
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