| EMS | early morning specimen; early morning stiffness; electrical muscle stimulation; Electronic Medical S... |
|---|---|
| ESB | electrical stimulation of the brain; enhanced skill building [program]; esterase B |
| ESPA | electrical stimulation-produced analgesia |
| ETS | educational testing service; electrical transcranial stimulation |
| LESS | lateral electrical spine stimulation |
| mean electrical axis | The average magnitude and direction of all the electromotive forces developed during the cardiac event under consideration; e.g., atrial or ventricular depolarisation, or ventricular repolarization. See: axis deviation. (05 Mar 2000) |
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| normal electrical axis | A mean electrical axis of the heart situated between -30 |
| instantaneous electrical axis | The resultant axis of the electromotive forces developing in the heart at any given moment. (05 Mar 2000) |
| electrical | 1. Pertaining to electricity; consisting of, containing, derived from, or produced by, electricity; as, electric power or virtue; an electric jar; electric effects; an electric spark. 2. Capable of occasioning the phenomena of electricity; as, an electric or electrical machine or substance. 3. Electrifying; thrilling; magnetic. "Electric Pindar." Electric atmosphere, or Electric aura. See Aura. Electrical battery. See Battery. Electrical brush. See Brush. Electric cable. See Telegraph cable, under Telegraph. Electric candle. See Candle. <medicine> Electric cat, any fish which has an electrical organ by means of which it can give an electrical shock. The best known kinds are the torpedo, the gymnotus, or electrical eel, and the electric cat. See Torpedo, and Gymnotus. Electric fluid, the supposed matter of electricity; lightning. <physics> Electrical image, the torpedo. Electric telegraph. See Telegraph. Origin: L. Electrum amber, a mixed metal, Gr.; akin to the beaming sun, cf. Skr. Arc to beam, shine: cf. F. Electrique. The name came from the production of electricity by the friction of amber. Source: Websters Dictionary (01 Mar 1998) |
| electrical alternans | Electrical alternation of the heart. (05 Mar 2000) |
| electrical alternation of heart | A disorder in which the ventricular or atrial complexes or both are regular in time but of alternating pattern; detected by electrocardiography. The P, QRS, T, QRS-T, or P-QRST alternate singly or in combination. (05 Mar 2000) |
| electrical axis | The net direction of the electromotive forces developed in the heart during its activation, usually represented in the frontal plane. See: triaxial reference system. (05 Mar 2000) |
| electrical conductivity | <radiobiology> Degree to which a substance conducts electric current. Can be defined by: (current density) = (conductivity) (applied electric field) Electrons and ions both contribute to current in proportion to their mobility in the system. In a plasma with a magnetic field, there is no longer a one-to-one correspondence between current and electric field. Instead, the current in each direction can be due to combinations of the electric fields in all the other directions. In this case, the current density and the electric field are vectors, and the conductivity becomes a tensor (matrix) which relates them. (09 Oct 1997) |
| electrical coupling | <physiology> General term for an intimate cytoplasmic contact, mediated by gap junctions, between touching cells, such that electrical current injected into either cell changes the membrane potential of both. In neurons, arrays of gap junctions form electrical synapses, that allow action potentials to pass directly between cells. However, electrical coupling is not confined to excitable cells: many embryonic and adult epithelia are coupled, possibly to allow metabolic cooperation. (18 Nov 1997) |
| electrical diastole | Period from end of T wave to beginning of next Q wave. (05 Mar 2000) |
| electrical failure | Failure in which the cardiac inadequacy is secondary to disturbance of the electrical impulse. (05 Mar 2000) |
| electrical formula | A graphic representation by means of symbols of the reaction of a muscle to an electrical stimulus. (05 Mar 2000) |
| electrical heart position | A description of the heart's assumed electrical habitus based upon the form of the QRS complexes in leads aVL, aVF, V1, and V6. Sometimes loosely (and inaccurately) used to describe the frontal plane electric axis. Synonym: heart position. (05 Mar 2000) |
| electrical synapse | <physiology> A connection between two electrically excitable cells, such as neurons or muscle cells, via arrays of gap junctions. This allows the cells to be electrically coupled and so an action potential in one cell moves directly into the other, without the 1 ms delay inherent in chemical synapses. Electrical synapses do not allow modulation of their connection and so only occur in neuronal circuits where speed of conduction is paramount (e.g. The crayfish escape reflex). A few electrical synapses are rectifying, implying a more specialised property than a simple gap junction. (18 Nov 1997) |
| electrical systole | The duration of the QRS-T complex (i.e., from the earliest Q-wave to the end of the latest T wave on the ECG). Electromechanical systole, the period from the beginning of the QRS complex to the first (aortic) vibration of the second heart sound. Synonym: Q-S2 interval. (05 Mar 2000) |