Understanding Sinus Rhythms and Blocks

Understanding Sinus Rhythms and Blocks

Assessment

Interactive Video

Science, Biology

10th - 12th Grade

Practice Problem

Hard

Created by

Ethan Morris

FREE Resource

This video tutorial covers chapter seven of the ECG course, focusing on sinus rhythms. It begins with a review of the electrical conduction system, highlighting the role of the SA node as the heart's pacemaker. The tutorial explains various sinus rhythms, including normal sinus rhythm, sinus arrhythmia, sinus bradycardia, and sinus tachycardia, detailing their characteristics and differences. It also discusses sinus pause and block, emphasizing their distinctions. The video concludes with a review and practice session for identifying different arrhythmias on an EKG.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary function of the SA node in the heart's conduction system?

To initiate the heart's electrical impulse

To delay the impulse to allow ventricular filling

To conduct impulses to the Purkinje fibers

To act as a backup pacemaker

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a characteristic of a normal sinus rhythm?

Narrow QRS complex

Rate of 60 to 100 beats per minute

Presence of P waves

Irregular rhythm

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does sinus arrhythmia differ from normal sinus rhythm?

It lacks P waves

It is irregular

It has a wider QRS complex

It has a faster rate

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the defining feature of sinus bradycardia?

Rate greater than 100 beats per minute

Irregular rhythm

Rate less than 60 beats per minute

Absence of P waves

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What typically causes sinus tachycardia?

Ectopic pacemaker activity

Blockage in the AV node

Compensatory mechanism within the body

Overstimulation of the vagus nerve

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the typical treatment for symptomatic sinus bradycardia?

Beta-blockers

Atropine and fluids

Calcium channel blockers

Defibrillation

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a common cause of sinus tachycardia?

Decreased blood volume

AV node dysfunction

Purkinje fiber malfunction

Increased vagal tone

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