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Usually doesn’t need treatment;Can be caused by drugs such as CCBs and BBs;Also seen with acute myositis, AMI, and electrolyte disturbances
the impulse generated in the SA node in the atrium does not propagate to the ventricles; Because the impulse is blocked, an accessory pacemaker in the lower chambers will typically activate the ventricles.Often significantlybradycardic
You will often find P waves buried within QRS or T wave complexes
Because it is an prolongation of the ventricular depolarization, the QRS is wide (takes longer for the impulse to go through both ventricles)LEFT: activation of the left ventricle is delayed, which results in the left ventricle contracting later than the right ventricle.
Extreme sinus bradycardia, sinus arrest/pauses >2.0 s duration, chronotropic incompetence, heart blocks, tachybrady syndrome (sick sinus syndrome)
Ventricular tachycardiaAttach the AED and shock the patient! Get HELP!
Sinus rhythmST elevationGet a 12-lead and HELP!
Acute MI! Tombstoning!GET HELP! (aka a cardiologist!)
How is this different from the atrial fibrillation rhythm we just saw? REGULAR!!!
Sinus arrest13 big boxes x .20 seconds = 2.6 second pause!(Much greater than 2.0 seconds and you’re at risk for passing out)