interval

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Related to AA interval: QT interval

interval

 [in´ter-val]
the space between two objects or parts; the lapse of time between two events.
AA interval the interval between two consecutive atrial stimuli.
atrioventricular interval (AV interval)
2. in dual chamber pacing, the length of time between the sensed or paced atrial event and the next sensed or paced ventricular event, measured in milliseconds; called also atrioventricular or AV delay.
cardioarterial interval the time between the apical beat and arterial pulsation.
confidence interval an estimated statistical interval for a parameter, giving a range of values that may contain the parameter and the degree of confidence that it is in fact there.
coupling interval the distance between two linked events in the cardiac cycle.
His-ventricular (H-V) interval an interval of the electrogram of the bundle of His, measured from the earliest onset of the His potential to the onset of ventricular activation as recorded on eight of the intracardiac bipolar His bundle leads or any of the multiple surface ECG leads; it reflects conduction time through the His-Purkinje system.
lucid interval
1. a brief period of remission of symptoms in a psychosis.
2. a brief return to consciousness after loss of consciousness in head injury.
PA interval the interval from the onset of the P wave on the standard electrocardiogram (or from the atrial deflection on the high right atrial ECG) to the A wave on the His bundle ECG; it represents intra-atrial conduction time.
postsphygmic interval the short period (0.08 second) of ventricular diastole, after the sphygmic period, and lasting until the atrioventricular valves open.
P–R interval in electrocardiography, the time between the onset of the P wave (atrial activity) and the QRS complex (ventricular activity).
presphygmic interval the first phase of ventricular systole, being the period (0.04–0.06 second) immediately after closure of the atrioventricular valves and lasting until the semilunar valves open.
QRST interval (Q–T interval) in the electrocardiogram, the length of time between ventricular depolarization (the Q wave) and repolarization (the T wave); it begins with the onset of the QRS complex and ends with the end of the T wave.
VA interval [ventricular-atrial interval] the interval between a ventricular stimulus and the succeeding atrial stimulus; it is equal to the AA interval minus the atrioventricular interval.

in·ter·val

(in'tĕr-văl),
A time or space between two periods or objects; a break in continuity.
[L. intervallum, space between breastworks in a camp, an interval, fr. vallum, a rampart, wall]

interval

/in·ter·val/ (in´ter-val) the space between two objects or parts; the lapse of time between two events.
atrioventricular (AV) interval  the time between the start of atrial systole and the start of ventricular systole, equivalent to the P–R interval of electrocardiography.
cardioarterial interval  the time between the apex beat and arterial pulsation.
confidence interval  an estimated statistical interval for a parameter, giving a range of values that may contain the parameter and the degree of confidence that it is in fact there.
coupling interval  the length of time between an ectopic beat and the sinus beat preceding it; in an arrhythmia characterized by such beats, the intervals may be constant (fixed coupling i's) or inconstant (variable coupling i's) .
escape interval  the interval between an escape beat and the normal beat preceding it.
interdischarge interval  the time between two discharges of the action potential of a single muscle fiber.
interpotential interval  the time between discharges of action potentials of two different fibers from the same motor unit.
P–R interval  the portion of the electrocardiogram between the onset of the P wave (atrial depolarization) and the QRS complex (ventricular depolarization).
lucid interval 
1. a brief period of remission of symptoms in a psychosis.
2. a brief return to consciousness after loss of consciousness in head injury.
pacemaker escape interval  the period between the last sensed spontaneous cardiac activity and the first beat stimulated by the artificial pacemaker.
P–P interval  the time from the beginning of one P wave to that of the next P wave, representing the length of the cardiac cycle.
QRS interval  the interval from the beginning of the Q wave to the termination of the S wave, representing the time for ventricular depolarization.
QRST interval , Q–T interval the time from the beginning of the Q wave to the end of the T wave, representing the duration of ventricular electrical activity.
systolic time intervals  (STI) any of several intervals measured for assessing left ventricular performance, particularly left ventricular ejection time, electromechanical systole, and preejection period.
V–A interval  the time between a ventricular stimulus and the atrial stimulus following it.

interval

[in′tərval]
Etymology: L, intervallum, space between
a space between things or events, or a break or interruption in an otherwise continuous flow.

interval

Vox populi A period of time or space between 2 discrete periods or objects. See AH interval, AV interval, Class interval, Confidence interval, Conference interval, Dosing interval, Escape interval, Lucid interval, PA interval, QT interval, V-A interval.

in·ter·val

(in'tĕr-văl)
A time or space between two periods or objects; a break in continuity.

in·ter·val

(in'tĕr-văl)
A time or space between two periods or objects; a break in continuity.

interval

the space between two objects or parts; the lapse of time between two events. In statistical terms, the numerical distance between two values.

atrioventricular interval, A-V interval
see P-R interval (below).
cardioarterial interval
the time between the apex beat and arterial pulsation.
P-R interval
in electrocardiography, the time between the onset of the P wave (atrial activity) and the QRS complex (ventricular activity).
QRST interval, Q-T interval
the duration of ventricular electrical activity.