A third degree AV block means that the AV node is completely blocked and no impulses are getting through to the ventricles. There will be P waves ‘marching on’ through the trace without any clear relationship to the QRS complexes. The QRS complexes will be following their own escape rhythm with complete disregard to the P waves.See also: AV Blocks
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This ECG is from a woman in her 60s who presented with chest pain, nausea, vomiting and diarrhoea for 4 hours.
This ECG shows complete heart block with most likely junctional escape and LBBB. Excessive discordant ST elevation in inferior leads and concordant ST depression in V2. The cause was an acute inferior MI.