13. MTB Step 3 - ECGs

Question 1

ARRHYTHMIAS

What are the (3) Simplified Criteria for Recognition of Atrial FIBRILLATION on ECG?

Answer 1

1. Multiple F-waves replace P-waves at a Rate of 350 - 650 bpm
2. Irregular Ventricular response (R-R cycle constantly varying). If the Ventricular rate is Rapid, Irregularity is More Difficult to Determine.
3. The QRS resembles that of the Normal Cardiac rhythm.

Question 2

ARRHYTHMIAS

See Pic

Answer 2

Atrial FIBRILLATION

with (characteristic) Irregular Ventricular Response

Question 3

ARRHYTHMIAS

See Pic

Answer 3

Atrial FIBRILLATION

Question 4

ARRHYTHMIAS

See Pic

Answer 4

Atrial FIBRILLATION

Question 5

ARRHYTHMIAS

See Pic

Answer 5

Atrial FIBRILLATION

with 3 Unifocal VPCs in Bigeminy

Question 6

ARRHYTHMIAS

See Pic

Answer 6

Atrial FIBRILLATION

with Bundle Branch Block

Question 7

ARRHYTHMIAS

What are the (3) Simplified Criteria used for recognizing Atrial FLUTTER on ECG?

Answer 7

1. Repetitive Firing of ONE focus in the Atria with a Regular F-F cycle between 220 - 350 bpm.
2. F-waves replace P-waves
3. The QRS complex usually resembles that of the Normal Cardiac Rhythm.

Question 8

ARRHYTHMIAS

See Pic

Answer 8

Atrial FLUTTER

with 4:1 conduction (4 P-waves for each 1 QRS)

Question 9

ARRHYTHMIAS

See Pic

Answer 9

Atrial FLUTTER

with Varying conduction

Question 10

ARRHYTHMIAS

What are the (3) Simplified Criteria for Recognition of Accelerated JUNCTIONAL Rhythm and JUNCTIONAL Tachycardia on ECG?

Answer 10

1. Rapid and Repetitive firing of Six or more JPCs in a row.
2. The QRS usually resembles that of the Normal cardiac rhythm.
3. The Ventricular Rate is between 60 - 99 bpm for an Accelerated Junctional Rhythm and between 100 - 220 bpm for a Junctional Tachycardia.

Question 11

ARRHYTHMIAS

What is the Cause of Junctional Ectopic Rhythms?

Answer 11

Repetitive and Rapid firing of an Ectopic Focus located In or Around the AV Junction.