Rhythm Practice

Front

Identify the rhythm:

Back

atrial fibrillation

Answer explanation

Atrial fibrillation is characterized by an irregular and often rapid heart rhythm due to chaotic electrical signals in the atria. This differentiates it from atrial flutter and other rhythms, making it the correct choice.

Front

Identify the rhythm:

Back

sinus arrhythmia

Front

Identify the type of AV block.

Back

Mobitz type 1

Answer explanation

Mobitz type 1, also known as Wenckebach, is characterized by progressive prolongation of the PR interval until a beat is dropped. This pattern distinguishes it from other AV blocks, making it the correct choice.

Front

Identify the type of AV block.

Back

Mobitz type 2

Answer explanation

Mobitz type 2 is characterized by intermittent dropped beats without a preceding lengthening of the PR interval, distinguishing it from Mobitz type 1. This type is more concerning due to the risk of progression to complete heart block.

Front

Identify the rhythm:

Back

Atrial flutter

Answer explanation

Atrial flutter is characterized by a rapid, regular atrial rhythm, often seen as 'sawtooth' waves on an ECG, typically in the inferior leads. This distinguishes it from atrial fibrillation, sinus rhythm, and SVT.

Front

Identify the rhythm: Atrial fibrillation, Sinus tachycardia, MAT, SVT

Back

SVT

Answer explanation

SVT (Supraventricular Tachycardia) is characterized by a rapid heart rate originating above the ventricles, often presenting with a regular rhythm. This distinguishes it from atrial fibrillation and other options.

Front

Identify the type of AV block.

Back

3rd degree

Answer explanation

3rd degree AV block, also known as complete heart block, occurs when there is a complete failure of electrical conduction between the atria and ventricles, leading to dissociation between the two. This is the correct identification.

Front

Identify the rhythm:

Back

junctional escape

Answer explanation

Junctional escape occurs when the heart's natural pacemaker fails, and the junctional tissue takes over, resulting in a slower heart rate. This rhythm is characterized by a regular rate and absent or inverted P waves, distinguishing it from the other options.

Front

Identify the AV block:

Back

1st degree

Answer explanation

1st degree AV block is characterized by a prolonged PR interval with every atrial impulse conducted to the ventricles. This distinguishes it from Mobitz types 1 and 2, which involve dropped beats, and 3rd degree, which has no conduction.

Front

Identify the rhythm:

Back

Ventricular tachycardia

Answer explanation

Ventricular tachycardia (VT) is characterized by a rapid heart rate originating from the ventricles. It typically presents with wide QRS complexes and can be life-threatening, distinguishing it from other rhythms like SVT or atrial flutter.