Podcast
Questions and Answers
Which node serves as the pacemaker of the heart?
Which node serves as the pacemaker of the heart?
- SA node (correct)
- Sinus node
- Bundle of HIS
- AV node
What does the P wave represent in a healthy adult's ECG?
What does the P wave represent in a healthy adult's ECG?
- Ventricular repolarization
- Ventricular depolarization
- Atrial contraction (correct)
- Opening of the K+ channels
What is the normal duration of the PR interval in a normal rhythm?
What is the normal duration of the PR interval in a normal rhythm?
- 3-5 small boxes
- 0.08-0.10 seconds
- 0.04 seconds
- 0.12-0.20 seconds (correct)
Which of the following is a characteristic of Supraventricular Tachycardia (SVT)?
Which of the following is a characteristic of Supraventricular Tachycardia (SVT)?
Which of the following is a characteristic of Ventricular Tachycardia (Vtach)?
Which of the following is a characteristic of Ventricular Tachycardia (Vtach)?
Which of the following is a potential cause of dysrhythmias?
Which of the following is a potential cause of dysrhythmias?
Which class of drugs is used to decrease heart rates in atrial fibrillation and supraventricular tachycardia?
Which class of drugs is used to decrease heart rates in atrial fibrillation and supraventricular tachycardia?
Which node does the electrical impulse travel to after leaving the sinus node?
Which node does the electrical impulse travel to after leaving the sinus node?
What is the normal duration of the PR interval in a normal rhythm?
What is the normal duration of the PR interval in a normal rhythm?
What does the P wave represent in a healthy adult's ECG?
What does the P wave represent in a healthy adult's ECG?
What is the function of the SA node in a healthy heart?
What is the function of the SA node in a healthy heart?
What is the ST segment interval?
What is the ST segment interval?
What does the QRS complex represent in an ECG?
What does the QRS complex represent in an ECG?
What is a potential cause of ectopic beats and irregular rhythm?
What is a potential cause of ectopic beats and irregular rhythm?
What is a characteristic of atrial dysrhythmias (PACs)?
What is a characteristic of atrial dysrhythmias (PACs)?
What is a characteristic of Ventricular Tachycardia (Vtach)?
What is a characteristic of Ventricular Tachycardia (Vtach)?
In a normal rhythm, how should the ST segment appear on an ECG?
In a normal rhythm, how should the ST segment appear on an ECG?
Which of the following is a characteristic of Ventricular Fibrillation (Vfib)?
Which of the following is a characteristic of Ventricular Fibrillation (Vfib)?
Which of the following electrolyte imbalances can potentially cause dysrhythmias?
Which of the following electrolyte imbalances can potentially cause dysrhythmias?
Which class of drugs is aimed at delaying repolarization or blocking potassium (K+) channels?
Which class of drugs is aimed at delaying repolarization or blocking potassium (K+) channels?
Which of the following drugs is a sodium channel blocker that decreases irritability in the ventricles?
Which of the following drugs is a sodium channel blocker that decreases irritability in the ventricles?
Which of the following is a nonpharmacological measure that is usually tried first before using antidysrhythmics?
Which of the following is a nonpharmacological measure that is usually tried first before using antidysrhythmics?
Which of the following is a characteristic of Supraventricular Tachycardia (SVT)?
Which of the following is a characteristic of Supraventricular Tachycardia (SVT)?
Which of the following drugs is a calcium channel blocker that slows AV node automaticity and delays AV node conduction?
Which of the following drugs is a calcium channel blocker that slows AV node automaticity and delays AV node conduction?
Which of the following is a characteristic of Bradyarrhythmia?
Which of the following is a characteristic of Bradyarrhythmia?
Which of the following is a characteristic of Ventricular Tachycardia (Vtach)?
Which of the following is a characteristic of Ventricular Tachycardia (Vtach)?
Which of the following drugs is a beta blocker that decreases sympathetic nervous system activity and contributes to antidysrhythmic effects?
Which of the following drugs is a beta blocker that decreases sympathetic nervous system activity and contributes to antidysrhythmic effects?
Which of the following represents ventricular depolarization?
Which of the following represents ventricular depolarization?
What is the normal duration of the QRS complex in a normal rhythm?
What is the normal duration of the QRS complex in a normal rhythm?
Which of the following is a characteristic of atrial dysrhythmias (PACs)?
Which of the following is a characteristic of atrial dysrhythmias (PACs)?
What does the ST segment interval represent on an ECG?
What does the ST segment interval represent on an ECG?
Which of the following drugs is a calcium channel blocker that slows AV node automaticity and delays AV node conduction?
Which of the following drugs is a calcium channel blocker that slows AV node automaticity and delays AV node conduction?
Which of the following is a characteristic of ventricular dysrhythmias (PVCs)?
Which of the following is a characteristic of ventricular dysrhythmias (PVCs)?
What is the normal duration of the PR interval in a normal rhythm?
What is the normal duration of the PR interval in a normal rhythm?
Which of the following is a nonpharmacological measure that is usually tried first before using antidysrhythmics?
Which of the following is a nonpharmacological measure that is usually tried first before using antidysrhythmics?
Which of the following is a potential cause of dysrhythmias?
Which of the following is a potential cause of dysrhythmias?
Which node does the electrical impulse travel to after leaving the sinus node?
Which node does the electrical impulse travel to after leaving the sinus node?
Which of the following is a characteristic of Supraventricular Tachycardia (SVT)?
Which of the following is a characteristic of Supraventricular Tachycardia (SVT)?
Which of the following drugs is a sodium channel blocker that decreases irritability in the ventricles?
Which of the following drugs is a sodium channel blocker that decreases irritability in the ventricles?
Which of the following is a potential cause of dysrhythmias?
Which of the following is a potential cause of dysrhythmias?
What is the function of the SA node in a healthy heart?
What is the function of the SA node in a healthy heart?
Which of the following drugs is a beta blocker that decreases sympathetic nervous system activity and contributes to antidysrhythmic effects?
Which of the following drugs is a beta blocker that decreases sympathetic nervous system activity and contributes to antidysrhythmic effects?
Which class of drugs is used to decrease heart rates in atrial fibrillation and supraventricular tachycardia?
Which class of drugs is used to decrease heart rates in atrial fibrillation and supraventricular tachycardia?
What does the QRS complex represent in an ECG?
What does the QRS complex represent in an ECG?
Which node serves as the pacemaker of the heart?
Which node serves as the pacemaker of the heart?
What does the P wave represent in a healthy adult's ECG?
What does the P wave represent in a healthy adult's ECG?
Which class of drugs is aimed at delaying repolarization or blocking potassium (K+) channels?
Which class of drugs is aimed at delaying repolarization or blocking potassium (K+) channels?
Study Notes
Heart Rhythm and ECG
- The SA (Sinoatrial) node serves as the pacemaker of the heart.
- The P wave represents atrial depolarization in a healthy adult's ECG.
- The normal duration of the PR interval in a normal rhythm is 0.12-0.20 seconds.
- The electrical impulse travels to the AV node after leaving the sinus node.
Dysrhythmias
- A potential cause of dysrhythmias is electrolyte imbalance.
- A characteristic of Supraventricular Tachycardia (SVT) is a rapid heart rate.
- A characteristic of Ventricular Tachycardia (Vtach) is a wide QRS complex with a rapid heart rate.
- A characteristic of Ventricular Fibrillation (Vfib) is a chaotic heart rhythm.
ECG Intervals
- The QRS complex represents ventricular depolarization in an ECG.
- The normal duration of the QRS complex in a normal rhythm is 0.08-0.12 seconds.
- The ST segment interval represents the period of ventricular repolarization in an ECG.
- In a normal rhythm, the ST segment should appear isoelectric (flat) on an ECG.
Antidysrhythmic Drugs
- Class I drugs, such as sodium channel blockers, decrease irritability in the ventricles.
- Class II drugs, such as beta blockers, decrease sympathetic nervous system activity and contribute to antidysrhythmic effects.
- Class III drugs, such as potassium channel blockers, delay repolarization or block potassium (K+) channels.
- Class IV drugs, such as calcium channel blockers, slow AV node automaticity and delay AV node conduction.
Nonpharmacological Measures
- A nonpharmacological measure that is usually tried first before using antidysrhythmics is vagal maneuvers.
Atrial Dysrhythmias
- A characteristic of atrial dysrhythmias (PACs) is premature atrial contractions.
- A characteristic of atrial dysrhythmias (PACs) is a P wave that is different from the normal P wave.
Ventricular Dysrhythmias
- A characteristic of ventricular dysrhythmias (PVCs) is premature ventricular contractions.
- A characteristic of ventricular dysrhythmias (PVCs) is a wide QRS complex that is different from the normal QRS complex.
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Description
Test your knowledge of the electrical conduction pathway of the heart with this quiz. Learn about the role of the sinus node, AV node, Bundle of HIS, and more in maintaining a healthy heart rhythm. See if you can identify these key components on an ECG graph.
