- phase 4 depolarization
- the slow reduction of the membrane potential of heart muscle cells during phase 4 (electrical diastole); it is normal in pacemaker cells but sometimes abnormally accelerated.
Medical dictionary. 2011.
phase 4 depolarization
Look at other dictionaries:
phase 0 — in cardiac physiology, the phase representing the upstroke of the action potential, in which rapid depolarization occurs after the cell reaches or is driven to threshold potential. It is the result of the opening of fast sodium channels and… … Medical dictionary
Diastolic depolarization — In mammals cardiac electrical activity originates from specialized myocytes of the sinoatrial node (SAN) which generate spontaneous and rhythmic action potentials (AP). The unique functional aspect of this type of myocyte is the absence of a… … Wikipedia
Quinidine — Systematic (IUPAC) name (9S) 6 methoxycinchonan 9 ol … Wikipedia
Cardioversion — Intervention ICD 9 CM 99.6 MeSH … Wikipedia
Sodium channel blocker — Sodium channel blockers are agents used in the treatment of cardiac arrhythmia. They are classified as Type I in the Vaughan Williams classification.Antiarrhythmic The class I antiarrhythmic agents interfere with the (Na+) channel.Class I agents… … Wikipedia
Q wave — kyü . n the short initial downward stroke of the QRS complex in an electrocardiogram formed during the beginning of ventricular depolarization * * * the downward deflection on an electrocardiogram that indicates the beginning of ventricular… … Medical dictionary
Dofetilide — Systematic (IUPAC) name N [4 (2 {[2 (4 methane sulfonamidophenoxy)ethyl] (methyl)amino}ethyl)phenyl]methanesulfonamide Clinical data AHFS/ … Wikipedia
Action potential — In physiology, an action potential is a short lasting event in which the electrical membrane potential of a cell rapidly rises and falls, following a consistent trajectory. Action potentials occur in several types of animal cells, called… … Wikipedia
Long-term potentiation — (LTP) is a persistent increase in synaptic strength following high frequency stimulation of a chemical synapse. Studies of LTP are often carried out in slices of the hippocampus, an important organ for learning and memory. In such studies,… … Wikipedia
Cardiac action potential — The cardiac action potential is a specialized action potential in the heart, with unique properties necessary for function of the electrical conduction system of the heart.The cardiac action potential differs significantly in different portions… … Wikipedia
