repolarization


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repolarization

 [re″po-lah-rĭza´shun]
1. the reestablishment of polarity, especially the return of a cell's membrane potential to resting potential after depolarization.
2. in cardiac physiology, the restoration of the cell to its maximal diastolic potential, represented by phase 0 to phase 3 of the action potential.

re·po·lar·i·za·tion

(rē'pō-lăr-i-zā'shŭn),
The process whereby the membrane, cell, or fiber, after depolarization, is polarized again, with positive charges on the outer and negative charges on the inner surface.

repolarization

(rē-pō′lər-ĭ-zā′shən)
n.
The restoration of a polarized state across a membrane, as in a muscle fiber following contraction.

re·po·lar·i·za·tion

(rē-pō'lăr-ī-zā'shŭn)
The process whereby the membrane, cell, or fiber, after depolarization, is polarized again, with positive charges on the outer and negative charges on the inner surface.

repolarization

Restoration of the resting polarized state in a muscle or nerve fibre. Polarization implies a balanced electrical charge on either side of the fibre membrane, being, in the resting state, negative on the inside and positive on the outside. In depolarization the charges are locally reversed.
References in periodicals archive ?
The autonomic and intrinsic cardiac involvement affects ventricular repolarization and prolongs QTc and Tp-e intervals (14, 15).
KEYWORDS: Advanced age, Arrhythmia, Electrocardiogram, Pregnancy, Ventricular repolarization.
showed that elevated repolarization ability is directly associated with sympathetic cardiac activation in patients with essential hypertension.
The most common arrhythmia was found to be Supra ventricular tachycardia (SVT) 126 (44%), followed by premature ventricular contractions (PVCs) 80 (28%), early repolarization 34 (11.9%), Atrial fibrillation (AF) 25(8.7%), first degree heart block 15(5.2%),inappropriate sinus tachycardia (IST) 6 (2.1%).
Prominent positive atrial repolarization waves ([T.sub.a]) are seen after the QRS complexes in leads II, III, and aVF giving rise to ST segment elevation, mimicking ST elevation myocardial infarction.
T peak is a marker of epicardial repolarization while T end is believed to represent completion of repolarization of the mid-myocardial cells.
Using specific formulations of [Na.sup.+], [K.sup.+], and [Ca.sup.2+] currents based on the experimental data recorded from human atrial myocytes, along with representations of pump, exchange, and background currents, the model is computationally efficient and correctly replicates physiologically repolarization process.
The QT interval on the surface ECG is a composite of ventricular activation (QRS) and completion of repolarization (end of the T wave) as well as the net effect of these forces reaching the body surface [15].
Identifying Drug-Induced Repolarization Abnormalities from Distinct ECG Patterns in Congenital Long QT Syndrome.
QT interval which is the time interval between beginning of Q wave and end of T wave represents electrical depolarization and repolarization of ventricles.
Further details such as QT interval prolongation and functional AVB due to prolonged ventricular repolarization were accurately diagnosed by fetal magnetocardiography (fMCG).