Coronary Occlusion Resulting Heart Block

Basic, Organ-Based and Clinical Sciences

There are various other injuries that can cause heart block in a patient with MI or undergoing cardiac surgery. Damage to the distal RCA below the take-off of the AVNBA leading to RBBB or in a patient with pre-existing LBBB can lead to complete heart block but below the level of the AV Node manifesting as heart block with ventricular escape. If the patient has baseline RBBB and there is damage to the PDA or the LAD, a resultant complete heart block can occur or a bifasicular block can occur. This can be hard to predict since there are two L bundles with varied coronary blood supply.


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Dan Smith, MD