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PVCs can be distinguished from premature atrial contractions because the compensatory pause is longer following premature ventricular contractions, in addition to a difference in QRS appearance. [20] In some people, PVCs occur in a predictable pattern. Two PVCs in a row are called doublets and three PVCs in a rows are triplets.
Ectopic beat is a disturbance of the cardiac rhythm frequently related to the electrical conduction system of the heart, in which beats arise from fibers or group of fibers outside the region in the heart muscle ordinarily responsible for impulse formation (i.e., the sinoatrial node).
[1] Bigeminy is contrasted with couplets, which are paired abnormal beats. Groups of three abnormal beats are called triplets and are considered a brief run of non-sustained ventricular tachycardia (NSVT), and if the grouping lasts for more than 30 seconds, it is ventricular tachycardia (VT). [2]
The medications that most commonly cause first-degree heart block are those that increase the refractory time of the AV node, thereby slowing AV conduction. These include calcium channel blockers, beta-blockers, cardiac glycosides, and anything that increases cholinergic activity such as cholinesterase inhibitors. [2]
A mult box is a device that allows a single audio source, such as a microphone, to be shared to multiple outputs for recording or broadcast. [1] A mult box is sometimes called a press box, but that term is usually reserved for the sports media's section of an arena. It may also be called a press mult box or press bridge. [2]
In the U.S. and Canada, the jewel box of a music CD was originally packaged for retail sale in a large cardboard box called a longbox in order to fit in store fixtures designed for vinyl records, offer larger space for display of artwork and marketing blurbs, and deter shoplifting. This packaging was much-criticized as environmentally wasteful ...
Mutifocal techniques, in particular the multifocal ERG, are used in the diagnosis of ophthalmological diseases. The multifocal technique was developed in the early 1990s in the laboratory of Erich Sutter at the Smith-Kettlewell Eye Research Institute [ 1 ] [ 2 ] [ 3 ]
The second Cardiac Arrhythmia Suppression Trial (CAST II) modified the enrollment criteria to include patients at higher risk for serious arrhythmia. [4] This included 1) patients enrolled within 4 to 90 days of a previous MI, 2) a left ventricular ejection fraction lower than 40%, 3) prior to enrollment, suppression of PVCs had occurred with the drugs (vs. placebo) using a double-blinded ...