interval

(redirected from QRS interval)
Also found in: Dictionary, Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to QRS interval: QT interval

interval

noun abeyance, break, gap, halt, hiatus, interlude, intermission, interregnum, interruption, intervallum, intervening time, lapse, lull, pause, recess, respite, rest, spatium interiectum, spell, truce
See also: abeyance, cessation, discontinuance, duration, hiatus, moratorium, pause, pendency, period, point, recess, remission, space, term, time

INTERVAL. A space of time between two periods. When a person is unable to perform an act at any two given periods, but in the interval he has performed such act, as when a man is found to be insane in the months of January and March, and he enters into a contract or makes a will in the interval, in February, he will be presumed to have been insane at that time; and the onus will lie to show his sanity, on the person who affirms such act. See Lucid interval.

References in periodicals archive ?
Cases of QTc prolongation had a higher heart rate, QTc, and QRS interval and a lower PR interval compared with noncases.
A prolonged QRS interval suggests a diseased ventricular conduction system and has been associated with increased risk for sudden cardiac death, among other heart disorders.
The sodium bicarbonate can be stopped once the patient's QRS interval shrinks to less than 100 milliseconds.
14) In June of 2003, the Centers for Medicare and Medicaid Services (CMS) approved reimbursement for ICD placement in patients with an EF of 30% or less and a QRS interval greater than 120 ms.
They also had to have cardiac dyssynchrony as reflected by a QRS interval of at least 120 msec.
A prolonged QRS interval has been required for participation in all major CRT trials and is routinely used as a screening criterion for CRT eligibility in clinical practice.
The CARE-HF trial enrolled patients with New York Heart Association (NYHA) class III or IV heart failure, a left ventricular ejection fraction of 35% or less, a left ventricular end-diastolic dimension of at least 30 mm, and a QRS interval of at least 120 msec.
For example, the cost per added life-year remained less than $40,000 whether or not treatment was limited to patients with left ventricular ejection fractions of 30% or less, to patients aged 65 years or older, or to patients with a QRS interval of 120 msec or more.
CMS imposed the registry requirement as part of its September decision to pay for implantable cardioverter defibrillators (ICDs) regardless of QRS interval, and to extend coverage to patients with nonischemic cardiomyopathy.
Those results showed that an implanted resynchronization device could cut the death rate by 27%, and the rate of death or hospitalization for worsening heart failure by 40%, in patients with a left ventricular ejection fraction of less than 35%, a left ventricular end-diastolic volume of at least 55 mm, a QRS interval of at least 130 msec, and a 6-minute walking distance of no more than 450 m.
At present, based upon data from the pre-SCD-HeFT era, Medicare will pay for an ICD in a patient who has ischemic heart failure, a left ventricular ejection fraction of 30% or less, prior MI, and an electrocardiogram showing a QRS interval of at least 120 milliseconds, regardless of whether the patient has experienced prior cardiac arrest.