ECG Abnormalities

Question 1

What is this?

Answer 1

1st Degree AV Block

A P wave is present and with normal configuration before every QRS complex.

The P-R interval is prolonged (greater than 0.20 second).

The QRS has a normal configuration.

The QRS duration is between 0.06 and 0.10 second.

The R-R intervals are regular.

The heart rate is usually within normal limits (60 to 100 beats per minute) but may be lower than 60 beats per minute.

“If R is far from P, then you have first degree”

Question 2

What is this?

Answer 2

Mobitz 1/Wenckeback Second Degree AV Block

• Initially a P wave precedes each QRS complex, but eventually a P wave may stand alone (conduction is blocked).
• Progressive lengthening of the P-R interval occurs in progressive order
• As the P-R interval increases, a QRS complex will eventually be dropped i.e. P wave not associated with a QRS complex
• This progressive lengthening of the P-R interval followed by a dropped QRS complex occurs in a repetitive cycle.
• The QRS configuration is normal, and the duration is between 0.06 and 0.10 second

“Longer, longer, drop, then you have Wenckeback

Question 3

What is this?

Answer 3

Mobitz 2 (Second Degree AV Block)

• Intermittent non-conducted p waves without progressive prolongation of PR interval.
• P waves “march through” at a constant rate.
• RR interval surrounding the dropped beats is an exact multiple of preceding RR interval

•“If some p’s don’t get through, then you have Mobitz II”

Question 4

What is this?

Answer 4

3rd degree AV Block

• No impulses that are initiated above the ventricles are conducted to the ventricle
• Atria fire at their own inherent rate
• Ventricles fire at their own inherent rate

•“If Ps and Qs don’t agree, then you have 3rd degree”

Question 5

What is this?

Answer 5

atrial arrhythmia

Question 6

What is this?

Answer 6

A fib

Question 7

What is this?

Answer 7

PVC

Question 8

What is this?

Answer 8

V tach

Question 9

What is this?

Answer 9

V fib

Question 10

What is this?

Answer 10

ST Segment Elevation

Question 11

What is this?

Answer 11

Ischemia