the ventricular cardiomyocyte membrane potential is about −90 mV at rest, which is close to the potassium reversal potential. When an action potential is...

allow the action potential to pass from one cell to the next. This means that all atrial cells can contract together, and then all ventricular cells. Rate...

electrocardiography, the atrial action potential are action potentials that occur in the heart atrium. They are similar to ventricular action potential with the exception...

An action potential occurs when the membrane potential of a specific cell rapidly rises and falls. This depolarization then causes adjacent locations...

arteries off the left ventricle during the left ventricular systole). Apex beat Cardiac action potential Cardiac output Pulse Pollock JD, Makaryus AN (3...

electrocardiogram is the result of inhibition of IKr, which prolongs the ventricular action potential. Ranolazine also exhibits its effects on the delayed rectifier...

affect one or more ion currents leading to prolongation of the ventricular action potential, thus lengthening the QT interval. Classification systems have...

potassium channels results in slowed atrial-ventricular myocyte repolarization. Class III agents have the potential to prolong the QT interval of the EKG,...

paroxysmal supraventricular tachycardia. Ventricular arrhythmias include ventricular fibrillation and ventricular tachycardia. Bradyarrhythmias are due to...

Ventricular fibrillation (V-fib or VF) is an abnormal heart rhythm in which the ventricles of the heart quiver. It is due to disorganized electrical activity...

contraction of ventricular cells. The ventricles must maximize systolic pressure to force blood through the circulation, so all the ventricular cells must...

compounds is related to the action of these drugs to induce potential fatal arrhythmias such as torsade de pointes or ventricular fibrillation. The anti-arrhythmic...

after-depolarizations triggered by the preceding action potential. These are often seen in patients with ventricular arrhythmias due to digoxin toxicity and reperfusion...

including: Cardiac rhythm disturbances (such as atrial fibrillation and ventricular tachycardia), Inadequate coronary artery blood flow (such as myocardial...

treatment for refractory life-threatening ventricular tachycardia or ventricular fibrillation. These agents are potentially pro-arrhythmic, especially in settings...

membrane potential that returns it to a negative value just after the depolarization phase of an action potential which has changed the membrane potential to...

ventricle conduction through the pre-excitation pathway, potentially leading to unstable ventricular arrhythmias). The definitive treatment of WPW is the...

membrane potential. This repolarization occurs quickly enough that another action potential can cause depolarization before the last action potential has dissipated...

Pheochromocytoma Sinus tachycardia Sleep deprivation Supraventricular tachycardia Ventricular tachycardia Wolff–Parkinson–White syndrome Drug related: Alcohol (Ethanol)...

used to prevent and treat abnormally fast heart rates. This includes ventricular and supraventricular tachycardias. Its use is only recommended in those...

device ventricular assist device, or, occasionally, heart transplantation may be recommended. Heart failure is a common, costly, and potentially fatal...

His-Purkinje system conducts action potentials much faster than can be propagated between myocardial cells, allowing the entire ventricular myocardium to contract...

circulation of blood and the ventricles are the discharging chambers. In late ventricular diastole, the atrial chambers contract and send blood to the ventricles...

A ventricular assist device (VAD) is an electromechanical device that provides support for cardiac circulation, which is used either to partially or to...

occur at each ventricular systole. Cardiac muscle tissue has autorhythmicity, the unique ability to initiate a cardiac action potential at a fixed rate...

important differences. Electrical stimulation in the form of a cardiac action potential triggers the release of calcium from the cell's internal calcium store...

number of types of cardiac dysrhythmias. This includes ventricular tachycardia (VT), ventricular fibrillation (VF), and wide complex tachycardia, as well...

resuscitation measure for cardiac arrest associated with ventricular fibrillation and pulseless ventricular tachycardia.) Pharmacologic cardioversion, also called...

Catecholaminergic polymorphic ventricular tachycardia (CPVT) is an inherited genetic disorder that predisposes those affected to potentially life-threatening abnormal...

powered from an AC wall socket, carried a potential hazard of electrocution of the patient and inducing ventricular fibrillation. A number of innovators,...