# beat

(redirected from ectopic beat)
Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.

## beat

1. Physics the low regular frequency produced by combining two sounds or electrical signals that have similar frequencies
2. Prosody the accent, stress, or ictus in a metrical foot
3. Nautical a course that steers a sailing vessel as close as possible to the direction from which the wind is blowing
4.
a. the act of scouring for game by beating
b. the organized scouring of a particular woodland so as to rouse the game in it
c. the woodland where game is so roused
5. Fencing a sharp tap with one's blade on an opponent's blade to deflect it

## Beat

A variation in the intensity of a composite wave which is formed from two distinct waves with different frequencies. Beats were first observed in sound waves, such as those produced by two tuning forks with different frequencies. Beats also can be produced by other waves. They can occur in the motion of two pendulums of different lengths and have been observed among the different-frequency phonons in a crystal lattice.

One important application of beat phenomena is to use one object with an accurately known frequency to determine the unknown frequency of another such object. The beat-frequency or heterodyne oscillator also operates by producing beats from two frequencies.

## beat

[bēt]
(physics)
The periodic variation in amplitude of a wave that is the superposition of two simple harmonic waves of different frequencies.

## beat

i. A low-frequency vibration produced when two sources of vibration act on the same object at the same time. For example, in a multiengine airplane, if two engines have slightly different RPM, airframe vibrations produced by these engines will produce a very noticeable beat.
ii. When two waves are combined or superimposed, a beat occurs if two frequencies are not the same. Waves beat together to create the appearance of either a change in amplitude, if the frequencies differ by a few hertz (Hz), or new frequencies, called beat frequencies or heterodynes, if the original frequencies are far apart.
References in periodicals archive ?
Multiple ectopic beats may lead to a rapid uncoordinated heartbeat (ventricular fibrillation) that can cause death.
As shown in table 3 and 4, we found a significant difference in terms of the mean numbers of total extra systoles and isolated ectopic beats between pure lidocaine with lidocaine + epinephrine and prilocaine with octapressin were significant in the second hour following the injection.
Ectopic beats initiating PAF originate from mainly (95%) left pulmonary vein, especially from left superior pulmonary vein (LSPV) (14-17).
EXTRA heartbeats, known as ectopic beats, are quite common if you are tired or have drunk too much.
People who live in soft-water areas, who use diuretics, or who are predisposed to magnesium loss or ectopic beats may require more dietary magnesium than would others.
The weight loss effects of sibutramine must be balanced against the cost of the drug (\$108 per month) and possible adverse health effects (increased heart rates, ventricular ectopic beats, or epileptic seizures).
As long as these ectopic beats remain occasional, everything should be all right.

Site: Follow: Share:
Open / Close