Module 11 Flashcards

1
Q

SA Node (60–100 bpm)

The SA Node generates electrical impulses that initiate each heartbeat.

A

What is the primary pacemaker of the heart?

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2
Q

What is the function of the AV Node?

A

Delays impulse to allow ventricular filling

This delay is crucial for proper heart function and efficient blood flow.

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3
Q

What does the Bundle of His do?

A

Conducts impulses from AV node to ventricles

It is part of the electrical conduction system of the heart.

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4
Q

What is the role of Purkinje Fibers?

A

Distribute impulse for coordinated ventricular contraction

They ensure that the ventricles contract in a synchronized manner.

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5
Q

What does the P wave represent in an ECG?

A

Atrial depolarization

It indicates the electrical activity associated with atrial contraction.

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6
Q

What does the QRS complex represent?

A

Ventricular depolarization

This is the most prominent part of the ECG, reflecting the contraction of the ventricles.

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7
Q

What does the ST segment indicate?

A

Time between ventricular depolarization and repolarization

It is important for assessing myocardial ischemia.

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8
Q

What does the T wave represent in an ECG?

A

Ventricular repolarization

This reflects the recovery phase of the ventricles.

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9
Q

What is Normal Sinus Rhythm (NSR)?

A

Heart rate of 60–100 bpm

Indicates a normal heart rhythm originating from the SA Node.

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10
Q

What defines Sinus Bradycardia (SB)?

A

Heart rate <60 bpm

This can occur in athletes or due to certain medications.

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11
Q

What is Sinus Tachycardia (ST)?

A

Heart rate >100 bpm

Often caused by stress, fever, or exercise.

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12
Q

What are Premature Atrial Contractions (PACs)?

A

Early atrial beats often caused by stress or caffeine

These are generally benign but can indicate underlying issues.

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13
Q

What is Paroxysmal Supraventricular Tachycardia (PSVT)?

A

Sudden burst of rapid atrial contractions

It can cause palpitations and may require treatment.

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14
Q

What is Atrial Flutter characterized by?

A

Sawtooth ECG pattern, atrial rate 250–350 bpm

It can lead to complications like stroke if untreated.

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15
Q

What is Atrial Fibrillation (A Fib)?

A

Irregular atrial activity; increased stroke risk

It is the most common type of serious heart arrhythmia.

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16
Q

What defines a Junctional Escape Rhythm?

A

Originates from AV node; HR 40–60 bpm

This rhythm can occur when the SA Node fails.

17
Q

What is First-Degree Heart Block?

A

Prolonged PR interval

It is typically benign and often asymptomatic.

18
Q

What is Second-Degree Block Type I (Wenckebach)?

A

Progressively lengthening PR interval, then dropped beat

This pattern can resolve on its own in some cases.

19
Q

What is Second-Degree Block Type II (Mobitz II)?

A

Dropped beats without PR lengthening

This type is more serious and can progress to complete heart block.

20
Q

What characterizes Third-Degree Heart Block?

A

No atrial impulses reach ventricles; requires pacemaker

This is a critical condition that can lead to severe bradycardia.

21
Q

What are Premature Ventricular Contractions (PVCs)?

A

Early, wide QRS ventricular beats

They can be benign but may signify underlying heart disease.

22
Q

What is Ventricular Tachycardia (V Tach)?

A

HR >100 bpm, wide QRS; may lead to V Fib

This is a potentially life-threatening condition requiring immediate attention.

23
Q

What characterizes Ventricular Fibrillation (V Fib)?

A

Disorganized ventricular activity; life-threatening

It is a critical emergency that requires immediate defibrillation.

24
Q

What is the duration of an ECG small box?

A

0.04 seconds

This helps in calculating heart rate and intervals.

25
Q

How do you estimate heart rate using a 6-second strip?

A

Count QRS complexes and multiply by 10

This method provides a quick way to assess the heart rate.

26
Q

What is the function of Beta-blockers?

A

Slow HR and reduce cardiac workload

They are commonly used in various cardiovascular conditions.

27
Q

What is the purpose of Calcium Channel Blockers?

A

Control atrial arrhythmias

They work by inhibiting calcium influx into heart cells.

28
Q

What do Antiarrhythmics (e.g., Amiodarone) do?

A

Stabilize cardiac conduction

They are used to restore normal rhythm in various arrhythmias.

29
Q

What is the role of Anticoagulants in A Fib?

A

Prevent stroke in patients with A Fib

They reduce the risk of thromboembolism associated with irregular heartbeats.

30
Q

What is Cardioversion used for?

A

Restore rhythm in A Fib, A Flutter, or PSVT

It can be done electrically or chemically.

31
Q

What does Catheter Ablation do?

A

Destroys abnormal cardiac conduction pathways

This procedure is used to treat certain arrhythmias effectively.