First Degree Heart Block || When the AV Node Just Won't Let Go

What happens when the AV node is too clingy and wants to spend a little more time with the impulse than needed? A first degree heart block! 🩺

Let’s talk 1st degree heart blocks!

In a normal heart, 🫀 the SA node (aka the pacemaker of the heart) will generate impulses that the AV node (aka the gatekeeper of the heart) promptly allows to pass through. When a 1st degree AV block is present, the original impulse is delayed at the AV node. This causes the PRI to be slightly longer than normal. Normal length is .12-.20 seconds (3-5 small boxes).

A first degree heart block can be caused by a STEMI because of the heart muscle injury, but can also be attributed to different medications 💊, electrolyte imbalances and cardiac problems (chronic or acute). One of the most common causes, however, is just advanced age…..aka an old heart.

A 1st degree heart block is typically of no immediate concern to EMS providers unless in conjunction with a life-threatening condition or injury. As always, treat your patient’s complaint.

These patients do not typically present with any symptoms due to the heart block itself.

🚨 Disclaimer: This is not meant to be used as or in the place of professional medical advice. Remember to abide by your local protocol & stay within your scope of practice.  🚨

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