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Group of pharmaceuticals that are used to suppress abnormally fast rhythms (tachycardias), such as atrial fibrillation, supraventricular tachycardia and ventricular tachycardia. Type I (sodium channel blockers) Type Ia Ajmaline; Procainamide; Quinidine; Type Ib Lidocaine; Phenytoin; Type Ic Encainide; Flecainide; Propafenone; Type II (beta ...
Tachycardia secondary to peripheral vasodilation and cardiac stimulation (Such tachycardia may be accompanied by palpitations.) [4] Tremor, excessive sweating, anxiety, insomnia, and agitation [5] More severe effects include paradoxical bronchospasm, hypokalemia, and in rare cases a myocardial infarction. [4]
Metoprolol is a beta blocker, or an antagonist of the β-adrenergic receptors. It is specifically a selective antagonist of the β 1-adrenergic receptor and has no intrinsic sympathomimetic activity. [37] Metoprolol exerts its effects by blocking the action of certain neurotransmitters, specifically adrenaline and noradrenaline.
Unless a pacemaker is present, beta blockers can severely depress conduction in the AV node, resulting in a reduction of heart rate and cardiac output. One should be very cautious with the use of beta blockers in tachycardia patients with Wolff-Parkinson-White Syndrome, as it can result in life-threatening arrhythmia in certain patients.
Treat recurrent tachycardia associated with abnormal conduction pathways, such as Wolff–Parkinson–White syndrome; II Beta-blockers Atenolol; Bisoprolol; Carvedilol; Esmolol; Metoprolol; Nebivolol; Propranolol; Timolol; Beta blocker Propranolol also has some sodium channel-blocking effect. Decrease mortality in patients with myocardial ...
A lot of POTS patients, whether they develop it due to COVID or not, are predominantly young women in their 20s and 30s, and many of them have Ehlers-Danlos syndrome, says Dr. Chung.
The primary application for phentolamine is for the control of hypertensive emergencies, most notably due to pheochromocytoma. [5]It also has usefulness in the treatment of cocaine-induced cardiovascular complications, where one would generally avoid β-blockers (e.g. metoprolol), as they can cause unopposed α-adrenergic mediated coronary vasoconstriction, worsening myocardial ischemia and ...
Labetalol was the first drug created that combined both α- and β-adrenergic receptor blocking properties. It was created to potentially fix the compensatory reflex issue that occurred when blocking a single receptor subtype, i.e. vasoconstriction after blocking β-adrenergic receptors or tachycardia after blocking α-adrenergic receptors.