Paramedic Drug Beta Blocker antiarrythmic Lopressor
Paramedic Drug Quiz prep - Metoprolol
Also known as:
Selective Beta Blocker
(class II antiarrythmic)
Mechanism of Action:
Reduction in heart rate, systolic BP, and cardiac output due to selective effects on Beta1 adrenergic receptors. Appears to inhibit tacycardia, especially following an MI.
Onset of Action:
20 minutes (IV)
5 - 8 hours
3 - 4 hours
* Suspected or definate acute MI who are also hypertensive and do not have any contraindications.
* Stable, narrow-complex tachycardia if rhythm remains uncontrolled or unconverted by adeosine or vagel maneuvers o if SVT is recurrent.
* Control ventricular rate in Pt's with A-fib or A-flutter.
* Cretain forms of polymorphic VT (assoc with acute ischemia, familial Long QT Syndrome, catecholaminergic)
* HR <45 bpm
Systolic BP <100 mmHg
Shock* Hx of asthma
* BP, pulse, ECG must be constantly monitored.
* Atropine and transcutaneous pacing should be available.
* heart block
Initial bolus of 5mg by slow IV injection. If vitals remain stable, a second 5mg bolus should be given 2 - 5 minutes after the first. If the first two doses are well tolerated,a third bolus of 5mg should be administered 2 - 5 minutes after the second dose.