CCRN CV QUESTIONS
AND ANSWERS ALL
UPDATED 2026
From CCRN class
# Term Definition
1 Entry to the R atrium
Where does a fib usually originate?
2 75% occlusion, except for the LAD at 50%
How much does a coronary artery
need to be occluded to require
intervention? What is the exception?
3 RC in 55% of people Circ in 45% of people
Which coronary artery supplies the SA
node?
4 RC in 90% of people Circ in 10% of people
Which coronary artery supplies the AV
node?
5 RA, RV, inferior and posterior wall of LV
Which tissue does the RCA supply?
6 Inferior or posterior MI RV infarct
If there is an occlusion in the
RCA, which infarct will be seen?
7 Anterior 2/3 of septum Anterior LV
Which part of heart does LAD supply?
,CCRN CV
8 LBB RBB
Which conducting systems fed by LAD?
9 Anterior wall MI
What happens if there is an occlusion
of the LAD
10 Part of LA Lateral wall
What tissue does the cricumflex artery
supply?
11 Lateral wall MI
What MI occurs with circumflex artery
ischemia?
12 DBP-PAOP Normal 60-80
Formula for coronary perfusion
pressure
13 S1
Closure of tricuspid and mitral valves right before systole
# Term Definition
14 S2
Closure of the pulmonic and aortic valves right after
systole
15 What is the biggest problem with
tachycardia? Increase O2 consumption When HR increases, systole
period stays the same but there is less time for diastole -
Reduces ventricular filling -Reduces coronary perfusion
16 S3
Kentucky Where S1 is ken, S2 is tuc, and S3 is key S3
occurs in early diastole (whereas S1 is late diastole right
before systole)
17 What causes S3? Rapid rush of blood into a dilated ventricle
, CCRN CV
18 Who gets S3
Mostly someone with HF Could be due to fluid overload
or mitral valve insufficiency Could be normal in teens or
pregnancy
19 S4 Tennessee, Ten = S4 Nes = S1 See = S2
20 Causes of S4
Late diastole before S1 Caused by blood pushing into
non-compliant ventricle Due to MI, HTN, ventricular
hypertrophy, aortic/pulmonic stenosis Always abnormal
21 Pericardial friction rub
Inflammation of pericardium - pericarditis Very common
after MI or heart surgery
22 How do you hear a friction rub?
Listen to 4-5th ICS at LSB with patient leaning forward
23 Formula for CO CO = SV x HR
24 What happens if preload is too high or
too low? If there is too much stretch on the myocardium,
(e.g.hypovolemia, hypervolemia) decreases contractility If there is too little stretch on
the myocardium, decreases contractility There is a
window of adequate stretch to maximize CO
25 Preload = LVEDP
26 PVR
Pulmonary vascular resistance Afterload of the R heart
# Term Definition
27 SVR
Systemic vascular resistance Afterload of the L heart
28 Normal CI 2.5-4
AND ANSWERS ALL
UPDATED 2026
From CCRN class
# Term Definition
1 Entry to the R atrium
Where does a fib usually originate?
2 75% occlusion, except for the LAD at 50%
How much does a coronary artery
need to be occluded to require
intervention? What is the exception?
3 RC in 55% of people Circ in 45% of people
Which coronary artery supplies the SA
node?
4 RC in 90% of people Circ in 10% of people
Which coronary artery supplies the AV
node?
5 RA, RV, inferior and posterior wall of LV
Which tissue does the RCA supply?
6 Inferior or posterior MI RV infarct
If there is an occlusion in the
RCA, which infarct will be seen?
7 Anterior 2/3 of septum Anterior LV
Which part of heart does LAD supply?
,CCRN CV
8 LBB RBB
Which conducting systems fed by LAD?
9 Anterior wall MI
What happens if there is an occlusion
of the LAD
10 Part of LA Lateral wall
What tissue does the cricumflex artery
supply?
11 Lateral wall MI
What MI occurs with circumflex artery
ischemia?
12 DBP-PAOP Normal 60-80
Formula for coronary perfusion
pressure
13 S1
Closure of tricuspid and mitral valves right before systole
# Term Definition
14 S2
Closure of the pulmonic and aortic valves right after
systole
15 What is the biggest problem with
tachycardia? Increase O2 consumption When HR increases, systole
period stays the same but there is less time for diastole -
Reduces ventricular filling -Reduces coronary perfusion
16 S3
Kentucky Where S1 is ken, S2 is tuc, and S3 is key S3
occurs in early diastole (whereas S1 is late diastole right
before systole)
17 What causes S3? Rapid rush of blood into a dilated ventricle
, CCRN CV
18 Who gets S3
Mostly someone with HF Could be due to fluid overload
or mitral valve insufficiency Could be normal in teens or
pregnancy
19 S4 Tennessee, Ten = S4 Nes = S1 See = S2
20 Causes of S4
Late diastole before S1 Caused by blood pushing into
non-compliant ventricle Due to MI, HTN, ventricular
hypertrophy, aortic/pulmonic stenosis Always abnormal
21 Pericardial friction rub
Inflammation of pericardium - pericarditis Very common
after MI or heart surgery
22 How do you hear a friction rub?
Listen to 4-5th ICS at LSB with patient leaning forward
23 Formula for CO CO = SV x HR
24 What happens if preload is too high or
too low? If there is too much stretch on the myocardium,
(e.g.hypovolemia, hypervolemia) decreases contractility If there is too little stretch on
the myocardium, decreases contractility There is a
window of adequate stretch to maximize CO
25 Preload = LVEDP
26 PVR
Pulmonary vascular resistance Afterload of the R heart
# Term Definition
27 SVR
Systemic vascular resistance Afterload of the L heart
28 Normal CI 2.5-4
