interval


interval
A time or space between two periods or objects; a break in continuity. [L. inter-vallum, space between breastworks in a camp, an i., fr. vallum, a rampart, wall]
- a-c i. the i. between the onset of the a wave and that of the c wave of the jugular pulse.
- AH i. the time from the initial rapid deflection of the atrial wave to the initial rapid deflection of the His bundle (H) potential; it approximates the conduction time through the AV node (normally 50–120 msec).
- AN i. the time between onset of the atrial deflection and the nodal potential (normally 40–100 msec).
- auriculoventricular i. the time between depolarization of the atria and of the ventricle. SYN: atrioventricular i..
- AV i. the time from the beginning of atrial systole to the beginning of ventricular systole as measured from pressure pulses or cardiac volume curves in animals, or from the electrocardiogram in humans.
- BH i. the duration of the His bundle deflections (normally 15–20 msec).
- calibration i. the period of time or series of measurements during which calibration can be expected to remain stable within specified and documented limits.
- cardioarterial i., c-a i. the time between the apex beat of the heart and the radial pulse beat.
- confidence i. a range of values for a variable of interest, constructed so that this range has a specified probability of including the true value of the variable.
- coupling i. the i., expressed in milliseconds, between a normal sinus beat and the ensuing premature beat.
- escape i. the time between the last beat of the patient's basic rhythm (ectopic or sinus beat) and a beat from a spontaneous escape focus or the initial electronic pacemaker impulse (a preset i. in the circuitry); it may be either a shorter or a longer time period than the pulse i..
- focal i. the distance between the anterior and posterior focal points of the eye.
- HV i. the time from the initial deflection of the His bundle (H) potential and the onset of ventricular activity (normally 35–45 msec).
- interectopic i. the distance between consecutive ectopic complexes in the electrocardiogram.
- isovolumic i. time during which both an AV and a semilunar valve are closed.
- lucid i. in psychoses or delirium, a rational period appearing in the course of the mental disorder.
- PA i. the time from onset of the P wave to the initial rapid deflection of the A wave in the His bundle electrogram (normally 25–45 msec); it represents the intraatrial conduction time.
- PJ i. the time elapsing from the beginning of the P wave to the end of the QRS complex (J for junction between QRS and T wave) in the electrocardiogram.
- P-P i. the distance between consecutive P waves in the electrocardiogram.
- PQ i. SYN: PR i..
- PR i. in the electrocardiogram, the time elapsing between the beginning of the P wave and the beginning of the next QRS complex; it corresponds to the a-c i. of the venous pulse and is normally 0.12–0.20 sec. SYN: PQ i..
- QR i. the time elapsing from the onset of the QRS complex to the peak of the R or the final R wave; measures the time of onset of the intrinsicoid deflection if determined in an appropriate unipolar lead tracing.
- QRB i. the time between the onset of the Q wave of the QRS complex and the right bundle-branch potential (normally 15–20 msec).
- QRS i. the duration of the QRS complex in the electrocardiogram.
- QS2 i. SYN: electromechanical systole.
- QT i. time from electrocardiogram Q wave to the end of the T wave corresponding to electrical systole.
- R-R i. the time elapsing between two consecutive R waves in the electrocardiogram.
- serial i. the period of time between analogous phases of an infectious illness in successive cases of a chain of infection that is spread from person to person. SEE ALSO: mass action principle, infection transmission parameter.
- sphygmic i. the period in the cardiac cycle when the semilunar valves are open and blood is being ejected from the ventricles into the arterial system. SYN: ejection period.
- Sturm i. the distance between the anterior and posterior focal lines in a spherocylindrical lens combination.
- systolic time intervals See electromechanical systole, left ventricular ejection time, preejection period.

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in·ter·val 'int-ər-vəl n a space of time between events or states <\intervals between pregnancies>

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in·ter·val (inґtər-vəl) [inter- + L. vallum rampart] the space between two objects or parts; the lapse of time between two recurrences or paroxysms.

Medical dictionary. 2011.

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  • Interval — may refer to:* Interval (mathematics), a range of numbers (formally, a subset of an ordered set) * Interval measurements or interval variables in statistics is a level of measurement * Interval (music), the relationship between two notes *… …   Wikipedia

  • interval — INTERVÁL, intervale, s.n. 1. Distanţă în timp între două fenomene, între două perioade, între două evenimente consecutive; răstimp. 2. Distanţă în spaţiu între două puncte, între două lucruri. ♦ (mat.) Ansamblu de puncte, de numere cuprinse între …   Dicționar Român

  • Interval — In ter*val, n. [L. intervallum; inter between + vallum a wall: cf. F. intervalle. See {Wall}.] [1913 Webster] 1. A space between things; a void space intervening between any two objects; as, an interval between two houses or hills. [1913 Webster] …   The Collaborative International Dictionary of English

  • InterVal — est le nom d un réseau de bus basé à Montereau Fault Yonne (77) appartenant au leader français du transport : Transdev. Services Les bus InterVal participent au réseau Comète du SMTCM. Les lignes 3, 4 …   Wikipédia en Français

  • interval — intèrvāl m <G intervála> DEFINICIJA 1. vrijeme između dviju jedinica u slijedu; međuvrijeme, stanka 2. prostor između dviju točaka ili predmeta [intervali između stupova grčkoga hrama nisu jednaki] 3. mat. podskup skupa realnih brojeva koji …   Hrvatski jezični portal

  • Interval — англ. [и/нтэвэл] Interval нем. [интэрва/ль] intervalle фр. [энтэрва/ль] intervallo ит. [интэрва/ллё] интервал …   Словарь иностранных музыкальных терминов

  • interval — англ. [и/нтэвэл] Interval нем. [интэрва/ль] intervalle фр. [энтэрва/ль] intervallo ит. [интэрва/ллё] интервал …   Словарь иностранных музыкальных терминов

  • interval — early 14c., from O.Fr. intervalle (14c.), earlier entreval (13c.), from L.L. intervallum space, interval, distance, originally space between palisades or ramparts, from inter between (see INTER (Cf. inter )) + vallum rampart (see WALL (Cf. wall)) …   Etymology dictionary

  • interval — ► NOUN 1) an intervening time or space. 2) a pause or break. 3) Brit. a pause between parts of a theatrical or musical performance or a sports match. 4) the difference in pitch between two sounds. DERIVATIVES intervallic adjective. ORIGIN …   English terms dictionary

  • Interval — In ter*val, Intervale In ter*vale, n. A tract of low ground between hills, or along the banks of a stream, usually alluvial land, enriched by the overflowings of the river, or by fertilizing deposits of earth from the adjacent hills. Cf. {Bottom} …   The Collaborative International Dictionary of English

  • interval — I noun abeyance, break, gap, halt, hiatus, interim, interlude, intermission, interregnum, interruption, interstice, intervallum, intervening time, lapse, lull, pause, recess, respite, rest, spatium interiectum, spell, truce II index abeyance …   Law dictionary


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