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Topic: Cardiac cycle

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	Cardiac cycle - Wikipedia, the free encyclopedia
		Cardiac cycle is the term used to describe the sequence of events that occur as a heart works to pump blood through the body.
		The frequency of the cardiac cycle is the heart rate.
		Throughout the cardiac cycle, the blood pressure increases and decreases.
	en.wikipedia.org /wiki/Cardiac_cycle (599 words)

	cardiac cycle (Site not responding. Last check: 2007-11-05)
		The cardiac cycle is divided into four separate periods, two of the periods occurring during the relaxation phase (Diastole) of the cardiac muscle, and two periods occurring during the contraction phase (Systole) of the cardiac muscle.
		The third period of the cardiac cycle is the Ventricular Ejection Period (VEP) which is a continuation of the systolic phase of the cardiac cycle.
		The ICP is characterized as the resting phase of the cardiac cycle when the ventricles are repolarizing and all valves (bicuspid, tricuspid, and semilunar) are closed.
	www.utpb.edu /courses/jeldridge/cardiac_cycle.htm (386 words)

	Cardiac Gated Ventilation (Site not responding. Last check: 2007-11-05)
		We evaluated the effects of synchronizing respiration to the cardiac cycle using a programmable ventilator and electron beam CT (EBCT) scanning.The hearts of anesthetized dogs were imaged during cardiac gated respiration with a 50 msec scan aperture.
		Cardiac Dynamics: Repetitive sweeps of the same target throughout a heart beat (scanning onset gated to the QRS complex of the ECG) yields two contiguous 8mm thick sections of the heart.
		Cardiac gated respiration was performed by initiating respiration in response to a signal generated when the electrocardiographic QRS complex exceeded a threshold value.
	dpi.radiology.uiowa.edu /spie/paper4/paper4.html (2621 words)

	Cardiac cycle
		Throught the cardiac cycle, the blood pressure increases and decreases.
		Cardiac Diastole is the period of time when the heart relaxes after contraction in preparation for refilling with circulating blood.
		The sinoatrial node, often known as the cardiac pacemaker, is located in the upper wall of the right atrium and is responsible for the wave of electrical stimulation (See action potential) that initiates atria contraction.
	www.mrsci.com /Cardiology/Cardiac_cycle.php (1307 words)

	Cardiac cycle Encyclopedia of Nursing and Allied Health - Find Articles
		One cardiac cycle is defined as the contraction of the two atria followed by contraction of the two ventricles.
		Each heart beat, or cardiac cycle, is divided into two phases of contraction and relaxation, stimulated by electrical impulses from the sinoatrial node (SA node), a patch of tissue in the heart that sets the rate of contractions.
		The role of the cardiac cycle is essential to maintain life, as the heart distributes the oxygen-carrying blood required for the functioning of the body.
	www.findarticles.com /p/articles/mi_gGENH/is_/ai_2699003126 (901 words)

	PHYSIOLOGY, BLOCK 2: JANUARY 1995 (Site not responding. Last check: 2007-11-05)
		The major periods of the cardiac cycle are diastole, during which the ventricles fill, and systole during which the ventricles eject blood.
		The cardiac pacemaker, which initiates the cardiac cycle, is located at the junction of the right atrium and the superior vena cava (sinoatrial node).
		Note that during the isovolumic phases (of contraction and relaxation) both valves are closed, and the contents of the ventricle are isolated from the arteries and the veins.
	condor.bcm.tmc.edu /MIEC/Syllabi/PhysB2/cardiac01.html (2686 words)

	Cardiac Cycle (Site not responding. Last check: 2007-11-05)
		The electrocardiogram (EKG) is a key to the mechanical events of the cycle because electrical events precede mechanical events and the phases of contraction and relaxation are described based on the activity of the ventricle.
		This extends from the end of the rapid filling phase in one cycle to the atrial contraction in the next cycle.
		The phase of rapid inflow is followed by a variable phase of slow filling during which filling is much less rapid, and the ventricle is almost at its maximum diastolic size.
	perfline.com /notebook/cycle.html (545 words)

	Cardiac Nuclear Medicine
		Cardiac nuclear medicine refers to these diagnostic tests that are used to examine the anatomy and function of the heart.
		Cardiac nuclear medicine tests are indicated for individuals with unexplained chest pain or chest pain brought on by exercise (called angina) to permit the early detection of heart disease.
		Heart-wall movement and overall heart function can be evaluated with cardiac gating, a technique that synchronizes the images of the heart with different parts of the cardiac cycle (contracting or relaxing) as determined by an electrocardiogram (ECG), which records the electrical currents that activate the heart muscle and cause it to pump.
	radiologyinfo.org /en/info.cfm?pg=cardinuclear (1638 words)

	Heart Structure & Cardiac Cycle
		The cardiac cycle consists of two phases; a period where the heart muscle is relaxed, called
		Cardiac systole then occurs, which is the time period when the heart muscle fibres contract, and this lasts for approximately 0.3 seconds.
		The atrioventricular valves are closed, so that the powerful contraction of the thick, muscular walls of the ventricles, forces open the semilunar valves, and blood from the right side of the heart flows into the pulmonary artery, and into the aorta from the left side.
	www.shelfield.walsall.sch.uk /html/heart_structure___cardiac_cycl.html (851 words)

	CCRF :: Canadian Cardiac Rehabilitation Foundation :: CCRF
		During systole of the cardiac cycle, the contraction of the left ventricle causes a wave of blood to enter the aorta.
		At the end of each ventricular contraction there is a relaxation phase of the cardiac cycle called diastole.
		In the cardiac patient, this extra load on the heart may cause angina to occur earlier and more frequently.
	www.cardiacrehabilitation.ca /documents/hypertensionsrole.php (723 words)

	Heart Physiology
		Approximately the size of a clenched fist, the heart is composed of cardiac muscle tissue that is very strong and able to contract and relax rhythmically throughout a person's lifetime.
		The contraction of the cardiac muscle tissue in the ventricles is called systole.
		The relaxation of the cardiac muscle tissue in the ventricles is called diastole.
	www.cardioconsult.com /Physiology (435 words)

	The CNO Cycle (Site not responding. Last check: 2007-11-05)
		The mass-15 isotope of Nitrogen captures a proton and emits an alpha-particle (that is, a nucleus of helium) to close the cycle and return to C-12.
		The net effect of the CNO cycle is to convert hydrogen to helium (the alpha particle emitted in the last step).
		As for the PP chain, the energy released in the CNO cycle is contained in the energy of the particles and gamma-rays produced in the steps of the cycle.
	csep10.phys.utk.edu /astr162/lect/energy/cno.html (397 words)

	Cardiac cycle (Site not responding. Last check: 2007-11-05)
		During which phase of the cardiac cycle are the atrioventricular, aortic semilunar and pulmonary semilunar valves all open?
		Closing of the atrioventricular valves during the cardiac cycle is caused by:
		In which phase of the cardiac cycle is the blood pressure of the atrium greater than the blood pressure of its corresponding ventricle?
	www.siumed.edu /~dwade/phys310/Cardiaccycle.html (455 words)

	The Cardiac Cycle
		The specialised cardiac muscle of the SA node is characterised by the property of automatic self-excitation and it initiates each beat of the heart.
		The spontaneous generation of an action potential within the SA node initiates a sequence of events known as the cardiac cycle.
		Each cardiac cycle lasts approximately 0.8 second and spans the interval from the end of one heart contraction to the end of the subsequent heart contraction.
	www.jdaross.cwc.net /cardiac_cycle.htm (1160 words)

	Cardiac Auscultation: An Art Based on Science
		Although recognition of some cardiac events significantly improved within the three years of training (S3 and MS for internal medicine, MR and MSCLK for family practice) there was no overall improvement from medical students to residents.
		Interventions that alter cardiac dynamics are particularly useful in differentiating murmurs with similar patterns during the standard exam.
		The high specificity of the cardiac examination, particularly in the case of distinguishing functional from pathologic murmurs, suggests that this is an excellent screening tool in asymptomatic patients.
	intmedweb.wfubmc.edu /grand_rounds/1998/cardiac.html (4842 words)

	cardiac cycle
		The period of ventricular contraction is known as systole, cardiac systole, heart systole or ventricular systole; if you use the word systole and don't say atrial in front of it, it is assumed that you are talking about ventricular contraction!
		The Cardiac Cycle: The cardiac cycle includes all events that take place within the heart, from the beginning of one systolic contraction of the ventricles to the onset of the next systolic contraction of the ventricles; that is, by convention, the starting point of the cardiac cycle is the beginning of systole!
		Cardiac Output: Cardiac output refers to the total volume of blood pumped by the heart in a given period of time; this value approximates 5-6 L/min at rest.
	faculty.etsu.edu /currie/cardiaccycle.htm (1453 words)

	Physical Exam
		CARDIAC AUSCULTATION: Must be done with a clear understanding of the events of the cardiac cycle, origin and significance of the heart sounds and of murmurs.
		Cardiac auscultation is an important component of the cardiovascular assessment.
		To benefit most from this program the participant must understand the mechanical events of the cardiac cycle, and the mechanism of production of the cardiac sounds and of the various murmurs.
	classes.kumc.edu /som/cardiac_auscultation/physical2.htm (429 words)

	The Cardiac Cycle MEDSTUDENTS Cardiovascular Physiology
		During the cycle, gradient pressures are generated between the cardiac chambers and the great vessels, so they can be recorded and plotted on a diagram.
		Phase 1 - It is the onset of ventricular systole and coincides with the R wave peak in the ECG.
		In clinical practice, some terms are largely used and they are derived from the cardiac cycles events: stroke volume (SV) is the volume of blood the ventricle ejects at systole.
	www.medstudents.com.br /basic/cardfs/cardfs1.htm (1014 words)

	Keast and Elliott (1990) Fine body movements and the cardiac cycle in archery (Site not responding. Last check: 2007-11-05)
		This study examined the relationships between postural sway, aiming time, the cardiac cycle time and the placement of the first finger movement within the electrocardiac cycle, with the quality of the arrow shot.
		The cardiac cycle time increased significantly as the archers approached the loose of the good quality arrows but there was no significant increase in cardiac cycle time when arrows of average or bad quality were shot.
		The most consistent parameter related to the quality of the shot was the placement of the first finger movement within the ST phase or the mid-cycle phase of the electrocardiogram for arrows of good quality.
	www.getcited.org /pub/103366289 (337 words)

	The Cardiac Cycle (Site not responding. Last check: 2007-11-05)
		The cardiac cycle is a description of the mechanical activity of the heart as it pumps blood.
		In each case, the stage is named after what is going on in the ventricle, as the ventricle is the structure that ejects blood from the heart under high (or relatively high) pressure.
		In understanding the cardiac cycle, you must never forget that blood will always flow from an area of high pressure towards an area of low pressure.
	www.austincc.edu /emeyerth/cardiac1.htm (114 words)

	Glossary of Cardiac Cycle Terms
		A a tract of specialized cells that originates at the AV node and enters the interventricular septum, where it divides to form the right and the left bundle branches that travel down the septum, curve around the tip of the ventricular chambers, and travel back toward the atria along the outer walls.
		It is the maximum amount of blood that the ventricle will contain during a cycle, usally 135ml.
		It is the minumum amount of blood found in a ventricle during a cycle, usally 65ml, about half of EDV
	www.anatimation.com /glossary.htm (490 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		During the first part of the cardiac cycle, the atria contract and push blood into the ventricles.
		This cycle is repeated indefinitely at varying rates, depending on the needs of the body and the influences of the internal environment.
		Contraction of the atria or ventricles is called "systole" (SIS toe lee) and relaxation is called "diastole” (die ASS toe lee) To observe the cardiac cycle, we will expose a frog heart and determine the effects of several inotropes (factors which affect the strength of cardiac contraction)and chronotropes.
	www.austincc.edu /sstrong/phys_lab_cardiac_acc (801 words)

	Heart - Wikipedia, the free encyclopedia
		The heart is a hollow, muscular organ in vertebrates, responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods.
		The term cardiac (as in cardiology) means "related to the heart" and comes from the Greek καρδιά, kardia, for "heart." The heart is composed of cardiac muscle, an involuntary muscle tissue which is found only within this organ.
		The muscle wall surrounding the left ventricle is thicker than the wall surrounding the right ventricle due to the higher force needed to pump the blood through the systemic circulation.
	en.wikipedia.org /wiki/Cardiac (1612 words)

	Regulation of Cardiomyocyte Mechanotransduction by the Cardiac Cycle -- Yamamoto et al. 103 (10): 1459 -- Circulation (Site not responding. Last check: 2007-11-05)
		Effects of cardiac cycle on BNP and tenascin-C mRNA expression induced by mechanical strain.
		Autocrine release of angiotensin II mediates stretch-induced hypertrophy of cardiac myocytes in vitro.
		Cardiac muscle cell hypertrophy and apoptosis induced by distinct members of the p38 mitogen-activated protein kinase family.
	circ.ahajournals.org /cgi/content/full/103/10/1459 (3457 words)

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