What are the effects of Class I antiarrhythmics?

Class IA antidysrhythmics block sodium channels that are in an open state and moderately delay channel recovery time. This results in slow conduction of electrical impulse through cardiac tissue, increased duration of action potential, and decreased slop of phase 0 depolarization.

What are the potential side effects of Class IC drugs?

Other common side effects include:

• Nausea and vomiting.
• Blurred vision.
• Headache.
• Constipation.
• Bitter taste.

What is a Class 1 antiarrhythmics?

Class I antiarrhythmics are fast sodium channel blockers. They are responsible for phase 0 of fast-response cardiac action potentials. The three subclasses differ in their efficacy for reducing the slope of phase 0, with Ic drugs having the greatest and Ib drugs having the smallest effect on phase 0.

What is the most common side effect of antiarrhythmics?

Common side effects caused by antiarrhythmics include: tiredness. nausea (feeling sick) shortness of breath (if this gets so bad that you feel unsafe, seek medical attention immediately).

Which antiarrhythmics block potassium channels?

Amiodarone. It increases the duration of ventricular and atrial muscle action by inhibiting potassium channels and voltage-gated sodium channels.

What are the three subtypes of class 1 sodium channel blockers?

Vaughan–Williams classification

• Class 1: Na channel blockers (divided into 3 subgroups): 1A: prolong the action potential.
• Class 2: beta-blockers.
• Class 3: K channel blockers.
• Class 4: calcium channel blockers.
• Class 5: drugs that cannot be categorized into the above groups.

Which class of antiarrhythmic drugs predominantly blocks potassium channels?

Potassium-channel blockers comprise the Class III antiarrhythmic compounds according to the Vaughan-Williams classification scheme. These drugs bind to and block the potassium channels that are responsible for phase 3 repolarization.

What is the mechanism of action of class 1 antiarrhythmic drugs?

Mechanism of action of Na channel blockers Class 1 antiarrhythmics bind BIND Hyperbilirubinemia of the Newborn to and block the fast Na channels Channels The Cell: Cell Membrane in non-nodal tissue (e.g., myocytes. The three types of muscle cells are skeletal, cardiac, and smooth.

What would you monitor when administering an antiarrhythmic?

Assess your patient’s apical pulse rate and rhythm before administering an antiarrhythmic. Monitor his cardiac rate and rhythm continuously when therapy starts or any time the dosage is adjusted.

Can antiarrhythmic drugs cause hypotension?

Cardiovascular drugs associated with hypotension include dopamine agonists, antianginals and antiarrhythmics.

What would happen if the drug blocked K+ channels instead?

These drugs bind to and block the potassium channels that are responsible for phase 3 repolarization. Therefore, blocking these channels slows (delays) repolarization, which leads to an increase in action potential duration and an increase in the effective refractory period (ERP).

Which drug is potassium channel opener?

Potassium channel openers (KCOs) are a structurally diverse group of drugs which share the common property that they activate KATP channels, thereby hyperpolarizing the plasma membrane and reducing electrical excitability (Ashcroft and Gribble, 2000). They include diazoxide, cromakalim, pinacidil and nicorandil.