Basic Cardiology – XII
Contents
- 1 What is the duration of anticoagulation required before cardioversion of atrial fibrillation of duration 48 hours or more?
- 2 What is the duration up to which anticoagulation should be continued in cardioversion of atrial fibrillation of duration 48 hours or more ?
- 3 All of the following are correct about Lev's disease EXCEPT?
- 4 Commonest tachycardia in patients over 65 years -
- 5 Atrial Fibrillation
- 6 Multifocal atrial tachycardia usually shows multiple P wave morphologies in ECG -
- 7 What is the half life of adenosine?
- 8 In typical counter-clockwise atrial flutter the F waves are -
- 9 Non-sustained ventricular tachycardia is defined as ventricular tachycardia that is ≥ 5 consecutive beats but lasts -
- 10 Which of the following class of antiarrhythmic drugs work by blocking the rapid component of the delayed rectifier potassium current (IKr) -
- 11 Amiodarone belongs to which of the following class of drugs ?
What is the duration of anticoagulation required before cardioversion of atrial fibrillation of duration 48 hours or more?
Atrial fibrillation of duration 48 hours or more recommend 3 weeks of therapeutic anticoagulation with oral anticoagulation therapy (VKA, DTI, or FXa inhibitors) before cardioversion. When early cardioversion is required, all guidelines recommend TEE to exclude the presence of left atrial thrombus
What is the duration up to which anticoagulation should be continued in cardioversion of atrial fibrillation of duration 48 hours or more ?
Anticoagulation up to 4 weeks should be continued after cardioversion of atrial fibrillation.
All of the following are correct about Lev's disease EXCEPT?
Lev’s disease - progressive fibrosis of distal His–Purkinje system in elderly patients
Acquired complete heart block
Commonest tachycardia in patients over 65 years -
Atrial fibrillation
Atrial Fibrillation
Important Points
AF is strongly age-dependent,4% of individuals older than 60 years
8% of persons older than 80 years.
25% of individuals aged 40 years and older will develop AF during their lifetime.
Multifocal atrial tachycardia usually shows multiple P wave morphologies in ECG -
Multifocal atrial tachycardia Multiple P wave morphologies (≥ 3) and irregular RR intervals
What is the half life of adenosine?
Adenosine is rapidly cleared from plasma by the cellular elements of the blood and by vascular endothelial cells and subjected to enzymatic metabolism. The drug has a half-life of 0.6 to 10 seconds.
In typical counter-clockwise atrial flutter the F waves are -
Typical counter-clockwise atrial flutter, the F waves are negative in the inferior leads and positive in leads V1 and V2.
Clockwise atrial flutter, the deflection of the F waves is the opposite
Non-sustained ventricular tachycardia is defined as ventricular tachycardia that is ≥ 5 consecutive beats but lasts -
Non-sustained ventricular tachycardia (NSVT) is defined as ventricular tachycardia that is ≥ 5 consecutive beats but lasts < 30 s
Which of the following class of antiarrhythmic drugs work by blocking the rapid component of the delayed rectifier potassium current (IKr) -
Class- III -Mechanism of action - blocking the rapid component of the delayed rectifier potassium current (IKr)
Amiodarone belongs to which of the following class of drugs ?
Class- III - drugs in this class are amiodarone and sotalol
