Cardiac Conduction

Explain the role of the cardiac conduction system in the heart.

• The cardiac conduction system is responsible for pumping blood through the heart.

• The cardiac conduction system only causes irregular heartbeats.

• The cardiac conduction system has no role in the heart's electrical activity.

• The role of the cardiac conduction system is to coordinate the electrical activity of the heart and ensure that the heart beats in a synchronized and efficient manner.

What is the significance of the P wave in an EKG waveform?

• The P wave signifies the electrical activity associated with atrial contraction.

• The P wave signifies the electrical activity associated with the closing of the heart valves.

• The P wave signifies the electrical activity associated with muscle relaxation.

• The P wave signifies the electrical activity associated with ventricular contraction.

Describe the process of depolarization and repolarization in the context of EKG waveforms.

• Depolarization is represented by the T wave and repolarization is represented by the QRS complex on the EKG waveform.

• Depolarization is represented by the QRS complex and repolarization is represented by the T wave on the EKG waveform.

• Repolarization is represented by the P wave on the EKG waveform.

• Depolarization is not a significant part of the EKG waveform.

How is the QRS complex related to ventricular depolarization?

• The QRS complex is related to atrial depolarization

• The QRS complex is related to ventricular repolarization

• The QRS complex is unrelated to ventricular depolarization

• The QRS complex is directly related to ventricular depolarization.

What does the T wave represent in an EKG waveform?

• Contraction of the atria

• Depolarization of the ventricles

• Measurement of blood pressure

• Repolarization of the ventricles

Explain the difference between atrial and ventricular fibrillation in terms of EKG interpretation.

• Atrial fibrillation has taller QRS complexes compared to ventricular fibrillation.

• Ventricular fibrillation shows a regular rhythm on EKG while atrial fibrillation shows an irregular rhythm.

• Atrial fibrillation is characterized by wide and bizarre QRS complexes on EKG.

• The main difference in EKG interpretation between atrial and ventricular fibrillation is the presence of distinct P waves in atrial fibrillation and the absence of identifiable QRS complexes in ventricular fibrillation.

What is the normal duration of the PR interval in an EKG reading?

• 0.12 to 0.20 seconds

• 0.25 to 0.30 seconds

• 1 to 2 seconds

• 0.05 to 0.10 seconds

Describe the characteristics of a normal sinus rhythm on an EKG.

• A normal sinus rhythm on an EKG is characterized by a regular rhythm with a rate between 60-100 beats per minute, a P wave before each QRS complex, a PR interval of 0.12-0.20 seconds, a QRS complex duration of less than 0.12 seconds, and a normal QT interval.

• A normal sinus rhythm on an EKG is characterized by an irregular rhythm.

• A normal sinus rhythm on an EKG is characterized by a rate of less than 60 beats per minute.

• A normal sinus rhythm on an EKG is characterized by a wide QRS complex duration.

What are the key features of an EKG waveform during atrial flutter?

• Consistent ventricular response

• Irregular atrial rate

• Sawtooth pattern of atrial activity, regular atrial rate of 250-350 beats per minute, variable ventricular response

• Flatline atrial activity

Explain the significance of the ST segment in EKG interpretation.

• The ST segment is significant in EKG interpretation because changes in the ST segment can indicate myocardial ischemia, injury, or infarction.

• The ST segment is significant in EKG interpretation because it shows the level of oxygen in the blood.

• The ST segment is significant in EKG interpretation because it indicates the patient's age.

• The ST segment is significant in EKG interpretation because it measures blood pressure.