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Topic: Tachycardia

Related Topics

Ventricular tachycardia

Heartbeat

Orthostatic intolerance

Heart rate

Sinoatrial node

Cardiac arrhythmia

Sympathetic nervous system

Postural orthostatic tachycardia syndrome

Left ventricle

Arrhythmia

Defibrillation

Sinus rhythm

Calcium channel blocker

Cardiac pacemaker

Bradycardia

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	Tachycardia - Wikipedia, the free encyclopedia
		Tachycardia is an abnormally rapid beating of the heart, defined as a resting heart rate of 100 or more beats per minute in an average adult.
		Tachycardia is a general symptomatic term that does not describe the cause of the rapid rate.
		Ventricular tachycardia (VT or "V-tach") is a similar phenomenon occurring within the tissue of the ventricles, causing an extremely rapid rate with poor pumping action.
	en.wikipedia.org /wiki/Tachycardia (546 words)

	Sinus tachycardia - Wikipedia, the free encyclopedia
		Sinus tachycardia is a rhythm with elevated rate of impulses originating from the SA node, defined as a rate greater than 100 beats/min in an average adult.
		Sinus tachycardia is usually a response to normal physiological situations, such as exercise and an increased sympathetic tone with increased catecholamine release --- stress, fright, flight, anger.
		Sinus tachycardia accompanying a myocardial infarction may be indicative of cardiogenic shock.
	en.wikipedia.org /wiki/Sinus_tachycardia (491 words)

	Tachycardia
		Tachycardia can also be caused by lung problems, such as pneumonia or a blood clot in one of the lung's arteries.
		Tachycardia caused by heart or lung disease often is accompanied by chest pain or shortness of breath or lightheadedness.
		Tachycardia caused by medications or diet will go away quickly, usually within hours, when the chemical that is causing the problem is used up by the body or excreted in the urine.
	womenshealth.aetna.com /WH/ihtWH/r.WSIHW000/st.36134/t.36219.html (1082 words)

	Supraventricular Tachycardia
		Supraventricular tachycardia is one type of heart rhythm disorder.
		Tachycardias are rhythm disorders in which the heart beats faster than normal.
		In supraventricular tachycardia, the heart rate is sped up by an abnormal electrical impulse starting in the atria.
	www.emedicinehealth.com /supraventricular_tachycardia/article_em.htm (502 words)

	Tachycardia definition - Medical Dictionary definitions of popular medical terms
		Sinus tachycardia is due to rapid firing of a normal structure called the sinoatrial (sinus) node which is the natural pacemaker of the heart.
		Ventricular tachycardia is an abnormal heart rhythm that is rapid, regular and originates from an area of the ventricle, the lower chamber of the heart.
		Ventricular tachycardias are most commonly associated with heart attacks or scarring of the heart muscle from previous heart attacks and are life threatening.
	www.medterms.com /script/main/art.asp?articlekey=5698 (355 words)

	Welcome to Supraventricular Tachycardia
		The junctional tachycardias include: (a) AV node re-entry (the circuit includes the AV node and the perinodal atrial tissue) (b) Atrioventricular re-entry where the re-entrant circuit includes the AV node conducting in the anterograde direction and an accessory atrioventricular pathway conducting in the retrograde direction.
		The junctional tachycardias are generally "congenital" in that the critical substrate for the tachycardia is present at birth even though clinical presentation of tachycardia may occur at any age.
		For the atrial tachycardias, this frequently involves dual therapy with one drug intended to block AV nodal conduction to limit the mean heart rate (digitalis, verapamil, beta blockade) and a second drug to "stabilize membranes" and attempt to prevent the onset of tachycardia (quinidine, procainamide, flecainide, propafenone).
	www.lhsc.on.ca /uwodoc/pages/svt.htm (2431 words)

	Heart Info - Tachycardia
		The two main types of tachycardia are abnormal supraventricular tachycardias (which originate in the upper chambers of the heart, the atria) and ventricular tachycardias (which originate in the lower chambers of the heart, the ventricles).
		Tachycardias may also occur in the course of a heart attack (or myocardial infarction).
		If tachycardia is severe, or arises from the ventricle, immediate injectable medication or electric shock (electroconversion) may be required to stimulate the heart to return to a normal rate.
	www.heartinfo.org /ms/ency/729/main.html (776 words)

	Ventricular tachycardia
		Ventricular tachycardia is a rapid heart beat initiated within the ventricles, characterized by 3 or more consecutive premature ventricular beats.
		Ventricular tachycardia is a potentially lethal disruption of normal heartbeat (arrhythmia) that may cause the heart to become unable to pump adequate blood through the body.
		A common mechanism for ventricular tachycardia is reentry (re-stimulation of the electrical conductive pathway from a single initial stimulus).
	www.umm.edu /ency/article/000187.htm (371 words)

	Categories of Arrhythmias - Texas Heart Institute Heart Information Center (Site not responding. Last check: 2007-10-20)
		Tachycardia is a very fast heart rate of more than 100 beats per minute.
		Ventricular tachycardia is a condition in which the SA node no longer controls the beating of the ventricles.
		Supraventricular tachycardia is a rapid, regular heart rate where the heart beats more than 150 times per minute in the atria.
	www.tmc.edu /thi/arrhycat.html (1175 words)

	TheFetus.net - Supraventricular tachycardia-Gary M. Joffe, MD, Luis Izquierdo, MD, Anita Brown, RNC
		The final mechanism for supraventricular tachycardia is that of automatic atrial tachycardia resulting from a discreet pacemaker within the atrium outside of the sinoatrial node.
		Supraventricular tachycardia is rarely associated with intra- or extracardiac anomalies, in contrast to those fetuses with atrial flutter or fibrillation.
		The management of the fetus with a normal anatomical survey and supraventricular tachycardia is dependent upon the gestational age at diagnosis, and the presence or absence of hydrops fetalis.
	www.thefetus.net /page.php?id=64 (2015 words)

	Tachycardia: Abnormally Rapid Heart Rate
		Tachycardia is a heart condition defined by having a resting heart rate of over 100 beats a minute.
		Causes of tachycardia vary from person to person, but are often connected to lung disease, high blood pressure and heart disease.
		For ventricular tachycardia, an internal cardioverter defibrillator may be required to regulate the pulse rate.
	www.heartdiseasefocus.com /arrhythmia/tachycardia.php (377 words)

	Tachycardia (Site not responding. Last check: 2007-10-20)
		The chief symptoms of all tachycardias are fatigue, faintness, dizziness, shortness of breath, and a sensation of thumping or palpitation in the chest.
		Some tachycardias, such as paroxysmal tachycardia, are harmless and transitory phenomena that last a few minutes or hours, subside spontaneously, and cause no lasting effects.
		Tachycardias can be terminated by lying down and other basic physical measures, by administering an electrical shock to the heart to restore regular heart rhythm, or by medications.
	www.putnam.k12.il.us /Biology1.htm (248 words)

	MedlinePlus Medical Encyclopedia: Ventricular tachycardia
		Ventricular tachycardia is a potentially lethal arrhythmia and may result in an absent pulse.
		Ventricular tachycardia may become an emergency situation and may be require CPR, electrical defibrillation or cardioversion (electric shock), or intravenous anti-arrhythmic medications (such as lidocaine, procainamide, bretylium, or sotalol).
		Ventricular tachycardia may not cause symptoms in some people, but may be lethal in others -- it is a major cause of sudden cardiac death.
	www.nlm.nih.gov /medlineplus/ency/article/000187.htm (771 words)

	Tachycardia: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-20)
		Postural orthostatic tachycardia syndrome (or pots) is a condition of orthostatic intolerance in which a change from the supine position to an upright position...
		A supraventricular tachycardia (svt) is a rapid rhythm of the heart in which the origin of the electrical signal is either the atria or the av node....
		To distinguish SVT from Sinus Tachycardia one must simply look at the rate: If the rate of contraction is more than 150 bpm, EHandler: no quick summary.
	www.absoluteastronomy.com /encyclopedia/t/ta/tachycardia.htm (1657 words)

	Tachycardia
		Tachycardia can occur naturally, for example, when you are exercising.
		If your tachycardia seems related to exercise, you may need to have an ECG while exercising on a treadmill.
		Electrical shock may be necessary with atrial fibrillation, and especially with ventricular tachycardia and ventricular fibrillation.
	www.temple.edu /heart/html/tachycardia.html (622 words)

	Ventricular tachycardia
		Ventricular tachycardia (V-tach) is a rapid heart beat that originates in one of the lower chambers (the ventricles) of the heart.
		Ventricular tachycardia which lasts more than 30 seconds is referred to as sustained ventricular tachycardia.
		A person susceptible to sustained ventricular tachycardia often has a small abnormal area in the ventricles that is the source of the trigger event.
	www.lifesteps.com /gm/Atoz/ency/ventricular_tachycardia.jsp (663 words)

	eMedicine - Atrial Tachycardia : Article by Li Zhou, MD
		The first is focal atrial tachycardia, which arises from a localized area in the atria and has an anatomic preference for the crista terminalis, pulmonary veins, ostium of the coronary sinus, and atrial septum.
		Sinoatrial reentrant tachycardia is a subset of focal atrial tachycardia due to reentry originating from the superior aspect of the crista terminalis.
		The atrial tachycardia that manifests during exercise, acute illness with excessive catecholamine release, alcohol ingestion, hypoxia, metabolic disturbance, or with drug use (eg, caffeine, albuterol, theophylline, cocaine) is associated with automaticity or triggered activity.
	www.emedicine.com /med/topic188.htm (6128 words)

	Supraventricular Tachycardia (Site not responding. Last check: 2007-10-20)
		Supraventricular tachycardia (SVT) is an abnormal fast heart rhythm that starts in the upper chambers, or the atria, of the heart.
		With supraventricular tachycardia, you may have palpitations, an uncomfortable feeling that your heart is racing or pounding.
		If the arrhythmia does not stop and symptoms are severe, electrical cardioversion, in which a brief electric shock is given to the heart to reset the heart rhythm, may be needed.
	www.bcbswny.com /kbase/topic/special/ps1684/sec1.htm (843 words)

	Wide Complex Tachycardia in 42 Year Old Woman
		The tachycardia terminated with adenosine and the patient had reduced frequency of symptoms on diltiazem as an outpatient but sought curative therapy.
		In the EP lab her clinical tachycardia was easily inducible but only with ventricular extrastimuli.
		The tachycardia was not reset by even very premature right atrial extrastimuli but terminated with atrial extra-stimuli for the distal coronary sinus (Figure 2).
	naspe.box21.com /pages/studies/276065706Anonymous (170 words)

	Tachycardia treatment options and information at Mayo Clinic
		Mayo Clinic is internationally recognized for its expertise in treating tachycardia, (the heart has a fast and irregular heartbeat).
		For patients with tachycardia, the medical team at Mayo Clinic is led by electrophysiologists.
		For emergency care of patients with ventricular tachycardia, intravenous medications or defibrillation (an electric shock) must be delivered immediately to restore a normal heart rhythm.
	www.mayoclinic.org /tachycardia (420 words)

	Indian Pacing and Electrophysiology Journal - Francis4 (Site not responding. Last check: 2007-10-20)
		It is one of the eminently ablatable ventricular tachycardias.
		One of the earliest descriptions of ventricular tachycardia (VT) with a narrow QRS complex was by Cohen et al in 1972.
		Zipes et al postulated that the origin of the tachycardia was localized to a small region of reentry or triggered automaticity located in the posteroinferior left ventricle, close to the posterior fascicle of the left bundle branch.
	www.ipej.org /0403/francis4.htm (1858 words)

	The MSDS HyperGlossary: Tachycardia
		Tachycardia is a fast heart rate (100 beats per minute or faster in an adult).
		Tachycardia can be caused by exertion, strenuous exercise, emotions, hyperthyroidism (overactivity of the thyroid gland), disease, injury, heart disorders, or exposure to certain drugs or chemicals.
		Ventricular tachycardia refers specifically to tachycardia that is initiated in the ventricles of the heart.
	www.ilpi.com /msds/ref/tachycardia.html (326 words)

	PAROXYSMAL TACHYCARDIA (ATRIAL AND VENTRICULAR)
		The most common situation (>95%) is a slow-fast tachycardia (using the A-V node for the antegrade conduction and the abnormal pathway for retrograde conduction), in which P(prime) waves occur nearly simultaneous with, and are obscured by, the QRS complex.
		Tachycardia usually is paroxysmal with sudden onset, often initiated by a premature atrial ectopic beat with a critical PR interval.
		Ventricular tachycardia is characterized by rapid heart beats due to electrical signals arising from the ventricles, rather than the atrium.
	www.usc.edu /dept/biomed/bme403/Section_3/paroxysmal_tachycardia.html (474 words)

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