A. Atrial fibrillation.
B. Atrial flutter.
C. Paroxysmal supraventricular tachycardia.
D. Ventricular tachycardia.
Ans:.C Paroxysmal supraventricular tachycardia.
Adenosine is the drug of choice for Paroxysmal supraventricular tachycardia.
Paroxysmal supraventricular tachycardia (paroxysmal SVT)
- It is an episodic condition with an abrupt onset and termination.
- SVT in general is any tachyarrhythmia that requires atrial and/or atrioventricular (AV) nodal tissue for its initiation and maintenance.
- Palpitations and dizziness are the most common symptoms reported by patients with SVT. Chest discomfort may be secondary to a rapid heart rate, and it frequently subsides with the termination of the tachycardia. Persistent SVT may lead to tachycardia-induced cardiomyopathy.
- Acute management of paroxysmal supraventricular tachycardia(PSVT) includes controlling the rate and preventing hemodynamic collapse.
- If the patient is hypotensive or unstable, immediate cardioversion with sedation must be performed.
- If the patient is stable, vagal maneuvers can be used to slow the heart rate and to convert to sinus rhythm.
- If vagal maneuvers are not successful, adenosine can be used in increasing doses.
- If adenosine does not work, atrioventricular (AV) nodal blocking agents like calcium channel blockers or beta-blockers should be used, as most patients who present with PSVT have AV nodal reentrant tachycardia (AVNRT) or AV reentrant tachycardia (AVRT).