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Pacemakers

QuestionAnswer
Capture means: the pacemaker sends an electrical impulse AND the myocardium responds.
normally the pacemakers pattern is to ⚡ pacer spike → ❤️ QRS = CAPTURE Heart beats on its own ❤️ → pacemaker senses it → “I don’t need to fire.”
Heart beats on its own ❤️ → pacemaker senses it → “I don’t need to fire.” Normally, a pacemaker is supposed to watch the heart:
What is OVERSENSING the pacemaker detects something that isn’t actually a heartbeat—for example electrical noise—and mistakenly thinks: “Oh! The heart just beat. I don’t need to fire.
What is UNDERsensing doesn’t see a real beat → fires when it shouldn’t ⚡
On telemetry, you notice long pauses with no pacer spikes appearing, even though the patient’s rate is well below the programmed rate. What is the MOST likely problem? A. Failure to capture B. Undersensing C. Oversensing D. Normal pacemaker function Ans:c
no pacer spikes does not automatically mean oversensing. What else could it mean? Failure to pace/output: The pacemaker should fire but doesn’t produce a spike. ➡️ No ⚡ when one is expected
oversensing is when: The pacemaker detects electrical activity/noise that it mistakes for a heartbeat, so it inhibits pacing. ➡️ No ⚡ because it falsely thinks, “The heart already beat.”
What is the difference between failure to pace/output and failure capture No ⚡ = failed to PACE ⚡ but no QRS = failed to CAPTURE
why can capture is fail
Created by: Remarkable RN
 

 



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