PCCN |VERIFIED QUESTIONS AND CORRECT DETAILED ANSWERS|RATED AND
GRADED A+ NEW UPDATE| 2026/2027
Left anterior descending artery (LAD) perfuses which wall of the heart?
-Which ECG Leads will show a STEMI?
-Which ECG leads will show a reciprocal or ST depression?
-Risk for a papillary muscle rupture in which side of the heart chamber? - ANSWER✔ Septal and
Anterior Wall of the heart.
STEMI ECG Leads:
septal V1, V2.
anterior: v3, V4.
Reciprocal ST depression Leads: II, III, avF inferior wall.
Risk for papillary muscle rupture in Left Ventricle.
Circumflex artery perfuses which wall of the heart?
-Which ECG Leads will show a STEMI? - ANSWER✔ Lateral Wall of the heart.
STEMI ECG Leads:
Low Lateral Wall: V5, V6,
High Lateral Wall: I, avL.
Right Coronary Artery perfuses which wall of the heart?
-Which ECG Leads will show a STEMI?
-Which ECG leads will show a reciprocal or ST depression?
-Risk for a papillary muscle rupture in which side of the heart chamber? - ANSWER✔ Inferior Wall of
the heart.
ECG Leads: II, III, and avF.
, Reciprocal ST depression Leads: I, avL lateral wall.
Risk for papillary muscle rupture in Right Ventricle.
Risk for Right Ventricular Infarction.
Which heart block and sinus rhythm will show on the ECG for an inferior wall myocardial infarction? -
ANSWER✔ 2nd degree Type I (Wenckebach).
Sinus bradycardia.
Which coronary artery is known as the "widow-maker?" - ANSWER✔ Left Main Artery of the heart.
ECG: What do the P, PR, QRS, T, and QT waves represent? - ANSWER✔ P wave:
✺ Atrial depolarization
PR interval:
✺ AV conduction time (0.12 - 0.20 sec)
QRS:
✺ Ventricular depolarization (0.06 - 0.10 sec)
T wave:
✺ Ventricular repolarization
QT Interval
✺ Ventricular repolarization time
What does Q-waves mean on an ECG? - ANSWER✔ If present in contiguous leads, indicative of
myocardial necrosis
GRADED A+ NEW UPDATE| 2026/2027
Left anterior descending artery (LAD) perfuses which wall of the heart?
-Which ECG Leads will show a STEMI?
-Which ECG leads will show a reciprocal or ST depression?
-Risk for a papillary muscle rupture in which side of the heart chamber? - ANSWER✔ Septal and
Anterior Wall of the heart.
STEMI ECG Leads:
septal V1, V2.
anterior: v3, V4.
Reciprocal ST depression Leads: II, III, avF inferior wall.
Risk for papillary muscle rupture in Left Ventricle.
Circumflex artery perfuses which wall of the heart?
-Which ECG Leads will show a STEMI? - ANSWER✔ Lateral Wall of the heart.
STEMI ECG Leads:
Low Lateral Wall: V5, V6,
High Lateral Wall: I, avL.
Right Coronary Artery perfuses which wall of the heart?
-Which ECG Leads will show a STEMI?
-Which ECG leads will show a reciprocal or ST depression?
-Risk for a papillary muscle rupture in which side of the heart chamber? - ANSWER✔ Inferior Wall of
the heart.
ECG Leads: II, III, and avF.
, Reciprocal ST depression Leads: I, avL lateral wall.
Risk for papillary muscle rupture in Right Ventricle.
Risk for Right Ventricular Infarction.
Which heart block and sinus rhythm will show on the ECG for an inferior wall myocardial infarction? -
ANSWER✔ 2nd degree Type I (Wenckebach).
Sinus bradycardia.
Which coronary artery is known as the "widow-maker?" - ANSWER✔ Left Main Artery of the heart.
ECG: What do the P, PR, QRS, T, and QT waves represent? - ANSWER✔ P wave:
✺ Atrial depolarization
PR interval:
✺ AV conduction time (0.12 - 0.20 sec)
QRS:
✺ Ventricular depolarization (0.06 - 0.10 sec)
T wave:
✺ Ventricular repolarization
QT Interval
✺ Ventricular repolarization time
What does Q-waves mean on an ECG? - ANSWER✔ If present in contiguous leads, indicative of
myocardial necrosis
