•Discuss what is “happening”
(PQRST). Recognize depolari
🧠 Note: Atrial repolarization is hidden in the QRS complex.
🫀 Cardiac Cycle: PQRST Breakdown
Wave Electrical Activity Mechanical Event Depolari
P wave Atrial depolarization Atria contract (systole) Depolariz
PR interval Delay at AV node (conduction pause) Blood lls ventricles N/A (paus
QRS complex Ventricular depolarization Ventricles contract (systole) Depolariz
T wave Ventricular repolarization Ventricles relax (diastole) Repolariz
, Understand the terms: Sensing
•
as they relate to pacemakers.
⚡ Pacemaker Terms Breakdown
What It Loo
Term De nition
EC
Pacemaker detects the heart’s intrinsic electrical No pacing spik
Sensing
activity beat occurs
A pacemaker spike causes the heart muscle to Spike followed
Capture
contract wave or QRS
(PQRST). Recognize depolari
🧠 Note: Atrial repolarization is hidden in the QRS complex.
🫀 Cardiac Cycle: PQRST Breakdown
Wave Electrical Activity Mechanical Event Depolari
P wave Atrial depolarization Atria contract (systole) Depolariz
PR interval Delay at AV node (conduction pause) Blood lls ventricles N/A (paus
QRS complex Ventricular depolarization Ventricles contract (systole) Depolariz
T wave Ventricular repolarization Ventricles relax (diastole) Repolariz
, Understand the terms: Sensing
•
as they relate to pacemakers.
⚡ Pacemaker Terms Breakdown
What It Loo
Term De nition
EC
Pacemaker detects the heart’s intrinsic electrical No pacing spik
Sensing
activity beat occurs
A pacemaker spike causes the heart muscle to Spike followed
Capture
contract wave or QRS
