cardiac cycle


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Related to cardiac cycle: cardiac output, blood pressure, Heart sounds

cycle

 [si´k'l]
a succession or recurring series of events.
cardiac cycle a complete cardiac movement, or heart beat, including systole, diastole, and the intervening pause.
Cardiac cycle. From Applegate, 2000.
cell cycle the cycle of biochemical and morphological events occurring in a reproducing cell population; it consists of the S phase, occurring toward the end of interphase, in which DNA is synthesized; the G2 phase, a relatively quiescent period; the M phase, consisting of the four phases of mitosis; and the G1 phase of interphase, which lasts until the S phase of the next cycle.
citric acid cycle tricarboxylic acid cycle.
estrous cycle the recurring periods of estrus in adult females of most mammalian species and the correlated changes in the reproductive tract from one period to another.
hair cycle the successive phases of the production and then loss of hair, consisting of anagen, catagen, and telogen.
menstrual cycle see menstrual cycle.
ovarian cycle the sequence of physiologic changes in the ovary involved in ovulation; see also ovulation and reproduction.
reproductive cycle the cycle of physiologic changes in the reproductive organs, from the time of fertilization of the ovum through gestation and childbirth; see also reproduction.
sex cycle (sexual cycle)
1. the physiologic changes that recur regularly in the reproductive organs of nonpregnant female mammals.
2. the period of sexual reproduction in an organism that also reproduces asexually.
tricarboxylic acid cycle the cyclic metabolic mechanism by which the complete oxidation of the acetyl portion of acetyl-coenzyme A is effected; the process is the chief source of mammalian energy, during which carbon chains of sugars, fatty acids, and amino acids are metabolized to yield carbon dioxide, water, and high-energy phosphate bonds. Called also citric acid cycle, Krebs cycle, and TCA cycle.
 Central pathways of metabolism: How the body produces energy from the energy-containing nutrients using the tricarboxylic acid cycle. From Davis and Sherer, 1994.
urea cycle a cyclic series of reactions that produce urea; it is a major route for removal of the ammonia produced in the metabolism of amino acids in the liver and kidney.

car·di·ac cy·cle

the complete round of cardiac systole and diastole with the intervals between, or commencing with, any event in the heart's action to the moment when that same event is repeated.

cardiac cycle

Cardiology A cycle of pumping–systole and refilling–diastole. See Electrophysiology.

car·di·ac cy·cle

(kahr'dē-ak sī'kĕl)
The complete round of cardiac systole and diastole with the intervals between, commencing with any event in the heart's action and ending when same event is repeated.
Enlarge picture
CARDIAC CYCLE (ONE HEARTBEAT, PULSE 75): The outer circle represents the ventricles, the middle circle the atria, and the inner circle the movement of blood and its effect on the heart valves.

cardiac cycle

The period from the beginning of one heartbeat to the beginning of the succeeding beat, including systole and diastole. Normally, the atria contract immediately before the ventricles. The ordinary cycle lasts 0.8 sec with the heart beating approx. 60 to 85 times a minute in the adult at rest. Atrial systole lasts 0.1 sec, ventricular systole 0.3 sec, and diastole 0.4 sec. Although the heart seems to be working continuously, it actually rests for a good portion of each cardiac cycle.
A wart, typically found on the genitals, the perineum, the anus, or the mucosal surfaces of the vagina or mouth, usually spread by sexual contact. It is caused by various types of human papilloma virus and may be spread by physical contact with an area containing a wart. The spread of a wart from one labium to the other by autoinoculation is possible. The virus that causes the wart is usually transmitted sexually. Synonym: genital wart

Treatment

Topically applied liquid nitrogen, imiquimod cream, fluorouracil, or podophyllin may prove effective; multiple treatments are usually needed, including occasionally surgery, electrosurgery, or laser ablation. Extremely large lesions (Buschke-Lowenstein tumor) may need radical excision.

See: Cardiac Cycle illustration
See also: cycle

cardiac cycle

see HEART, CARDIAC CYCLE.
References in periodicals archive ?
Caption: FIGURE 10: Pressure distribution and wall shear stress distribution with particle deposition patterns in the artery model with 75% intensity of stenosis at the proximal LAD at the peak systole in the fifth cardiac cycle at t = 3.86 s.
On combination of Equations (3a)-(3c), [bar.[v.sub.b.//]]([x.sub.0], [y.sub.0]) can be characterized by the sum of the time integral intensities of particles which have appeared in pixel ([x.sub.0], [y.sub.0]) during the cardiac cycle, as shown in the following equation:
Caption: Figure 11: Examples of the left ventricle endocardium segmentation during different phases of the cardiac cycle. We display results from 0% to 80%.
Figure 6 shows the variations of WSS in form of contour plot at bifurcated section of healthy carotid artery at the end of one complete cardiac cycle at different Re of 544, 1088, and 2176 while considering Power Law rheological model.
This result seems to indicate that only when substantial tachycardia occurs there is the necessity to take into account the fact that DT shortens more than ET in the cardiac cycle.
B-mode ultrasound facilitates display of the cross section of the IJV and, therefore, measurement of the area and perimeter variation during the cardiac cycle [41].
This autocorrelation utilizes a continuous sine wave to describe the periodic motion of blood during a cardiac cycle and the root mean square of the sine waveform to describe a nominal stroke volume (Figure 1(b)).
An accurate quantification analysis of the RV function is an important diagnostic parameter and largely depends on how the RV cavity successfully segmented based on endocardial contour extraction in complete cardiac cycle. For many years, most of the studies focused on the assessment analysis of the left ventricular (LV) morphology and function, which overshadowed that of RV analysis [6].
In ECG-gated SPECT, data from specific parts of the cardiac cycle can be isolated.
--Measurements throughout cardiac cycle of displacement, velocity, strain and strain rate
The normal graphical display of a cardiac cycle will show an early systolic peak (P1) at maximum systolic pressure.