Understanding Sinus Rhythm and ECG

The video tutorial explains normal sinus rhythms, starting with the heart's electrical conduction system. It highlights the role of the sinoatrial node as the heart's pacemaker, initiating the electrical impulse that travels through the atrioventricular node, bundle branches, and Purkinje fibers. The tutorial describes the components of an ECG, including the P wave, QRS wave, and T wave, and defines a normal sinus rhythm as having a P wave and a rate of 60-80 beats per minute. It also covers atrial depolarization and its ECG representation, and discusses variations like sinus tachycardia and bradycardia.

What is the primary function of the heart's electrical conduction system?

• To pump blood throughout the body

• To generate electrical impulses for heartbeats

• To filter blood

• To regulate blood pressure

Where does the electrical conduction system of the heart begin?

• Atrioventricular node

• Bundle of His

• Sinoatrial node

• Purkinje fibers

What is the sinoatrial node commonly known as?

• The heart's pacemaker

• The heart's valve

• The heart's filter

• The heart's muscle

Which wave on an ECG represents atrial depolarization?

• QRS wave

• T wave

• P wave

• U wave

What is the typical range of beats per minute for a normal sinus rhythm at rest?

• 60 to 80 beats per minute

• 40 to 60 beats per minute

• 100 to 120 beats per minute

• 80 to 100 beats per minute

What does the presence of a P wave on an ECG indicate?

• Ventricular contraction

• Atrial contraction

• Heart failure

• Heart relaxation

What happens when the electrical impulse moves across both atria?

• The heart stops

• The heart rate decreases

• The atria contract

• The ventricles contract

What is the term for a heart rhythm with a P wave and a rate of 110 beats per minute?

• Ventricular tachycardia

• Sinus tachycardia

• Sinus bradycardia

• Atrial fibrillation

What is the term for a heart rhythm with a P wave and a rate of 40 beats per minute?

• Ventricular fibrillation

• Sinus bradycardia

• Sinus tachycardia

• Atrial flutter

Why is a rhythm with a P wave called a sinus rhythm?

• Because it originates from the sinoatrial node

• Because it originates from the bundle of His

• Because it originates from the Purkinje fibers

• Because it originates from the atrioventricular node