Management of Tachycardia

Initial Management

First-line treatment for patients with tachycardia includes beta-blockers (metoprolol, propranolol) or non-dihydropyridine calcium channel blockers (diltiazem, verapamil), as recommended by the American College of Cardiology 1, 2
The American Heart Association recommends metoprolol as an alternative to propranolol, with an initial dose of 5 mg IV, which can be repeated to a maximum of 15 mg 1
The initial dose of metoprolol should be administered over 1-2 minutes and can be repeated every 5 minutes as required, with close monitoring for adverse effects 3, 4

If beta-blockers alone are insufficient, adding diltiazem or verapamil is recommended, as suggested by the American College of Cardiology 1, 5
Non-dihydropyridine calcium channel blockers should not be used with beta-blockers in patients with decompensated heart failure, according to the American College of Cardiology 5

If pharmacological management fails, catheter ablation should be considered, especially for supraventricular tachycardias, with success rates >95% for certain arrhythmias like AVNRT, as recommended by the American College of Cardiology 1
Flecainide or propafenone may be considered as second-line treatment in patients without structural heart disease, as suggested by the American College of Cardiology 1

Beta-blockers (including labetalol) are relatively contraindicated in cocaine-induced tachycardia, according to the European Society of Cardiology 6
Oral beta-blockers and calcium channel blockers are effective for chronic management, while intravenous beta-blockers, diltiazem, or verapamil are recommended for acute treatment, as recommended by the American College of Cardiology 1
Patients on metoprolol should be monitored closely for hypotension, bradycardia, signs of heart failure exacerbation, and bronchospasm, especially in those with respiratory disease 4
Abrupt withdrawal of beta-blockers can lead to clinical deterioration and should be avoided, according to the American Heart Association 7
Reducing fluid rates while maintaining beta-blocker dosing may lead to relative overdose effects in patients on IV fluids 8
If tachycardia persists after initial treatment, consider alternative agents such as diltiazem or verapamil (if no heart failure), as suggested by the American College of Cardiology 4