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CRAT Study
CRAT Study 
Normal PRI interval - ANSWER 0.12-0.20 
Normal QRS interval - ANSWER 0.11 or less 
What does the P wave represent? - ANSWER Atrial depolarization 
What does the QRS complex represent? - ANSWER Atrial repolarization and 
ventricular depolarization 
Q wave indicates what? - ANSWER Dead myocardial tissue. Always a negative 
deflection 
What is the natural pacemaker of the heart? - ANSWER SA node 
3 types of pacemakers - ANSWER 1) single (either RA or RV) 
2) dual chamber (RA and LV) ...
- Exam (elaborations)
- • 3 pages •
CRAT Study 
Normal PRI interval - ANSWER 0.12-0.20 
Normal QRS interval - ANSWER 0.11 or less 
What does the P wave represent? - ANSWER Atrial depolarization 
What does the QRS complex represent? - ANSWER Atrial repolarization and 
ventricular depolarization 
Q wave indicates what? - ANSWER Dead myocardial tissue. Always a negative 
deflection 
What is the natural pacemaker of the heart? - ANSWER SA node 
3 types of pacemakers - ANSWER 1) single (either RA or RV) 
2) dual chamber (RA and LV) ...
CRAT Study
CRAT Study 
Normal PRI interval - ANSWER 0.12-0.20 
Normal QRS interval - ANSWER 0.11 or less 
What does the P wave represent? - ANSWER Atrial depolarization 
What does the QRS complex represent? - ANSWER Atrial repolarization and 
ventricular depolarization 
Q wave indicates what? - ANSWER Dead myocardial tissue. Always a negative 
deflection 
What is the natural pacemaker of the heart? - ANSWER SA node 
3 types of pacemakers - ANSWER 1) single (either RA or RV) 
2) dual chamber (RA and LV) ...
- Exam (elaborations)
- • 3 pages •
CRAT Study 
Normal PRI interval - ANSWER 0.12-0.20 
Normal QRS interval - ANSWER 0.11 or less 
What does the P wave represent? - ANSWER Atrial depolarization 
What does the QRS complex represent? - ANSWER Atrial repolarization and 
ventricular depolarization 
Q wave indicates what? - ANSWER Dead myocardial tissue. Always a negative 
deflection 
What is the natural pacemaker of the heart? - ANSWER SA node 
3 types of pacemakers - ANSWER 1) single (either RA or RV) 
2) dual chamber (RA and LV) ...