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Topic: Second degree heart block

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Type 1 Second degree heart block

Heart block

Third degree heart block

First degree heart block

Cardiac arrhythmia

Atrial flutter

Arrhythmia

Asystole

Electrocardiogram

Pulseless electrical activity

Atrial fibrillation

Electrical conduction system of the heart

Sick sinus syndrome

Supraventricular tachycardia

Ventricular fibrillation

	Heart block - Wikipedia, the free encyclopedia
		Blocks that occur within the sinoatrial node (SA node) are described as SA nodal blocks.
		Blocks that occur within the atrioventricular node (AV node) are described as AV nodal blocks.
		This is because if an individual had complete block at this level of the conduction system (which is uncommon), the secondary pacemaker of the heart would be at the AV node, which would fire at 40 to 60 beats a minute, which is enough to retain consciousness in the resting state.
	en.wikipedia.org /wiki/Heart_block (390 words)

	Second degree heart block - Wikipedia, the free encyclopedia
		Second degree heart block is a disease of the electrical conduction system of the heart.
		Mobitz I heart block is characterized by progressive prolongation of the PR interval on the electrocardiogram (EKG) on consecutive beats followed by a blocked beat (dropped QRS complex).
		Mobitz II heart block is characterized on a surface ECG by a fixed PR interval with a dropped QRS complex after a certain number of P waves.
	en.wikipedia.org /wiki/Second_degree_heart_block (344 words)

	Second degree heart block -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-07)
		Second degree heart block is a disease of the (Click link for more info and facts about electrical conduction system) electrical conduction system of the (The hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions pump blood through the body) heart.
		Mobitz I heart block is characterized by progressive prolongation of the PR interval on the (A graphical recording of the cardiac cycle produced by an electrocardiograph) electrocardiogram (EKG) on consecutive beats followed by a blocked beat (dropped QRS complex).
		Mobitz II heart block is characterized on a surface (A graphical recording of the cardiac cycle produced by an electrocardiograph) ECG by a fixed PR interval with a dropped QRS complex after a certain number of P waves.
	www.absoluteastronomy.com /encyclopedia/S/Se/Second_degree_heart_block.htm (500 words)

	Wisconsin Heart - (Site not responding. Last check: 2007-11-07)
		Heart block, also called atrioventricular block or A-V block, is an abnormality of the spread or flow of electrical activity from the upper heart chambers, the atria, to the lower chambers of the heart, the ventricles.
		First-degree block is a delay of the signal that stimulates the ventricles to contract; second-degree block is a partial or intermittent interruption of the signal that stimulates the ventricles to contract; and third-degree block is a complete interruption of the signal that stimulates the heart to contract.
		Heart block is also called atrioventricular block, because it often occurs in the atrioventricular, or A-V, node, which transmits electrical signals from the atria (the upper chambers of the heart) to the ventricles (the lower chambers of the heart).
	www.wiheart.cardiologydomain.com /images/uploaded/WiscHeart/bh.cfm (919 words)

	Disease: : find signs & symptoms
		In the normal heart, the contraction of the heart is regulated by a series of fibers that begin in the upper chamber, or atrium, and pass to the lower chambers, or ventricles.
		Second degree heart block occurs when some of the electrical impulse sent from the atria are not conducted to the ventricles.
		In third degree heart block, none of the pulses of the atria are conducted to the ventricles.
	www.myelectronicmd.com /get_reference.php?Id=313 (362 words)

	Heart Block
		Heart block is classified according to the level of impairment -- first-degree heart block, second-degree heart block or third-degree (complete) heart block.
		Complete heart block (complete AV block) means that the heart's electrical signal doesn't pass from the upper to the lower chambers.
		Complete heart block may be a medical emergency with potentially severe symptoms and a serious risk of cardiac arrest (sudden cardiac death).
	www.americanheart.org /presenter.jhtml?identifier=4611 (660 words)

	Second degree heart block (Site not responding. Last check: 2007-11-07)
		However it is possible to have asecond degree heart block involving the sinoatrial node (SA node) aswell.
		Mobitz I heart block is characterized by progressive prolongation of the PR interval on the electrocardiogram (EKG) on consecutive beats followed by a blocked beat (dropped QRS complex).After the dropped QRS complex, the PR interval resets and the cycle repeats.
		Mobitz II heart block is characterized on a surface EKG by a fixed PR interval with adroped QRS complex after a certain number of P waves.
	www.therfcc.org /second-degree-heart-block-8076.html (315 words)

	THE MERCK MANUAL--SECOND HOME EDITION, Heart Block in Ch. 27, Abnormal Heart Rhythms
		Heart block is a delay in the conduction of electrical current as it passes through the atrioventricular node, bundle of His, or both bundle branches, all of which are located between the atria and the ventricles.
		Heart block is classified as first-degree when electrical conduction to the ventricles is slightly delayed, second-degree when conduction is intermittently blocked, or third-degree (complete) when conduction is completely blocked.
		In third-degree heart block, no impulses from the atria reach the ventricles, and the ventricular rate and rhythm are controlled by the atrioventricular node, bundle of His, or the ventricles themselves.
	www.merck.com /pubs/mmanual_home2/sec03/ch027/ch027j.htm (442 words)

	Heart Block \| Horizon Health and Wellness (Site not responding. Last check: 2007-11-07)
		Heart block refers to a delay in the normal flow of electrical impulses that cause the heart to beat.
		In first-degree heart block, the signal is just slowed down a little as it travels along the defective part of the conduction system so that it arrives late traveling from the atrium to the ventricle.
		Third-degree heart block is a serious condition that affects the heart's ability to pump blood effectively.
	bcbsnj.myhealthyhorizon.com /topic/heartblock (622 words)

	s020703b - Hyperthyroidism and Heart Block
		Complete heart block in thyrotoxicosis is uncommon and previous reports relate to its occurrence in Graves' disease, usually complicated by infectious disorders.
		The development of second-degree heart block of Mobitz type 1 variety was followed by third- and then first-degree heart block.
		We conclude that the varying degrees of heart block were secondary to hyperthyroxinemia caused by Graves' disease and exogenous thyroid hormone.
	www.emory.edu /WHSCL/grady/amreport/litsrch02/s020703b.html (809 words)

	Second-Degree Heart Block
		Electrocardiographically, AV nodal and intra-His blocks are associated with a narrow QRS complex of conducted beats, and infra-Hisian block is generally seen with a bundle branch block pattern or conducted beats.
		AV nodal blocks can be differentiated from infranodal blocks (His bundle and bundle branches) by observing the magnitude of PR change from beat to beat, best appreciated with the beats immediately before and after the blocked P wave.
		On occasion, AF nodal block of a P wave may also be preceded by a constant PR interval; however, the baseline PR in such cases is long and a block of the P wave under such circumstances is not totally unexpected.
	www.americanheart.org /presenter.jhtml?identifier=36 (637 words)

	UMMC - Heart Block (Site not responding. Last check: 2007-11-07)
		Heart block is a disorder of the heartbeat.
		In third-degree block, known as complete heart block, no atrial impulses reach the ventricles and the flow of oxygenated blood to the brain and the rest of the body is insufficient.
		Heart block may be caused by coronary artery disease, inflammation of the heart muscle, rheumatic fever, or overdose of certain heart drugs.
	www.med.umich.edu /1libr/heart/rate04.htm (274 words)

	Dorlands Medical Dictionary
		sinoatrial block, sinoatrial exit block, a disturbance in which the atrial response is delayed or omitted because of partial or complete interference with the propagation of impulses from the sinoatrial node to the atria.
		splanchnic block, regional anesthesia produced by blocking the splanchnic nerves and the celiac ganglia; it is accomplished by injection of the anesthetic agent into the retroperitoneal tissues in the immediate vicinity of the celiac plexuses.
		third degree atrioventricular block, a third degree heart block due to total cessation of impulse conduction through the atrioventricular junctional tissue; no correspondence exists between atrial and ventricular activity, and ventricular asystole and death occur unless a ventricular pacemaker is activated.
	www.mercksource.com /pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_b_16zPzhtm (4158 words)

	HEART_ECG3 (Site not responding. Last check: 2007-11-07)
		This is "heart block" or "A-V block." This does not mean that the blood flow or blood vessels are blocked.
		Heart block is classified according to the level of impairment.
		First-degree heart block, or first-degree A-V block, is when the electrical impulse moves through the A-V nodemore slowly than normal.
	www.nku.edu /~dempseyd/HEART_ECG3.htm (288 words)

	U-M CVC - Heart Block (Site not responding. Last check: 2007-11-07)
		Heart block is an abnormal heart rhythm that usually results in a slow heart rate.
		When a child has heart block, the electrical impulse is delayed or blocked completely as it travels from the heart’s upper chambers (the atria) to the heart’s lower chambers (the ventricles).
		Heart block occurs at the level of the AV node.
	www.med.umich.edu /cvc/mchc/parhea.htm (719 words)

	Heart Block
		Heart Block is a type of bradycardia (too-slow heartbeat) that also is called atrioventricular, or AV block.
		In this condition, the electrical signals that stimulate heart muscle contractions are partially or totally blocked between the upper chambers (atria) and the lower chambers (ventricles).
		Treatment may also be necessary if bundle branch block is caused by an underlying heart condition, such as damage to the heart muscle from a heart attack (myocardial infarction).
	www.hrspatients.org /patients/heart_disorders/heart_block.asp (786 words)

	Heart Block \| Your Health Connection
		The block may affect every other beat, every second or third beat, or be very rare.
		Diagnosis of first-, and second-degree heart block is made by observing it on an electrocardiograph (ECG).
		Third-degree heart block usually results in symptoms such as fainting, dizziness and sudden heart failure, which require immediate medical care.
	www.yourhealthconnection.com /topic/heartblock (633 words)

	eMedicine - Heart Block, Second Degree : Article Excerpt by: David FM Brown, MD (Site not responding. Last check: 2007-11-07)
		Background: Second-degree heart block or second-degree atrioventricular (AV) block refers to a disorder of the cardiac conduction system in which some P waves fail to conduct to the ventricle and to generate a QRS complex.
		Mobitz I AV block, or Wenckebach block, is characterized by progressive prolongation of the PR interval causing progressive R-R interval shortening until a P wave fails to conduct to the ventricle.
		Most investigators believe that Mobitz I block localized to the AV node is not significantly associated with morbidity or death in the absence of organic heart disease.
	www.emedicine.com /emerg/byname/heart-block-second-degree.htm (330 words)

	Heart Block, Congenital
		In addition, Complete Heart Block may be associated with an impaired ability of the heart to pump blood effectively (congestive heart failure); chest pains; episodes of dizziness with or without loss of consciousness due to fluttering (fibrillation) or cessation (asystole) of the heart (Stokes-Adams attacks); and/or enlargement of the heart (cardiomegaly).
		Bundle Branch Block is a heart block caused by a lesion in one of the bundle branches in either the left or right sides of the heart.
		An EKG, which records the electrical activities of the heart muscle, and a vectorcardiogram, which records the magnitude and direction of the heart's electrical impulses, may confirm the presence of abnormal electrical patterns such as those associated with varying degrees of heart block.
	hw.healthdialog.com /kbase/nord/nord530.htm (1603 words)

	1st, 2nd, 3rd degree heart block
		Heart block, also known as atrioventricular block, is a condition in which conduction of the cardiac action potential from the atrium to the ventricle is impaired.
		The other degrees of heart block are caused by a strong autonomic response and are more serious than 1st degree AV block.
		Second degree heart block occurs when some, but not all of the impulses from the atrium are not conducted to the ventricle.
	www.usc.edu /dept/biomed/bme403/Section_3/heart_block2.html (220 words)

	HEART BLOCK
		Heart block refers to a delay of conduction of electrical signals from the atrium through the atrioventricular node (part of the electrical wiring of the heart).
		Heart block is detected with an electrocardiogram (ECG).
		Patients with type II block are at risk for complete heart block, cardiomyopathy (disease of the heart muscle), or death from asystole (the heart not beating).
	www.apma-nc.com /PatientEducation/heart_block.htm (603 words)

	Heart Block, Congenital Synonyms, Eastern Carolina
		Congenital Heart Block is characterized by interference with the transfer of electrical nerve impulses (conduction) that regulate the normal rhythmic pumping activity of the heart muscle (heart block).
		In the mild form of heart block (First Degree), the two upper chambers of the heart (atria) beat normally, but the contractions of the two lower chambers (ventricles) slightly lag behind.
		In the more severe forms (Second Degree), only a half to a quarter of the atrial beats are conducted to the ventricles.
	www.uhseast.com /145607.cfm (484 words)

	Complete heart block due to lyme carditis
		We present a case of third-degree AV block due to Lyme carditis, illustrating one of the cardiac complications of Lyme disease.
		We describe a case of progressive arrhythmia and heart failure combined with neurological symptoms that was resistant to conventional cardiological treatment.
		Heart block occurs usually at the level of the atrioventricular node but often is unresponsive to atropine sulfate.
	www.canlyme.com /heart.html (1380 words)

	Healthopedia.com - Heart Block (Atrioventricular Block, AV Block, Bundle Branch Block, Complete Heart Block, ...
		Heart block is a disruption in the relay of electrical signals that control activity of the heart muscle.
		The nodes, bundles, and fibers are responsible for the unified beating of the heart and the rate at which it beats.
		A block that appears suddenly may be due to a new heart problem or the worsening of an old one.
	www.healthopedia.com /heart-block (613 words)

	The Physician and Sportsmedicine: The Athletic Heart Syndrome
		Interestingly, athletes in whom first-degree heart block is absent often have relative prolongation of the PR interval.
		The frequency of third heart sounds is generally greater than 50% in dynamic athletes, with a range of 30% to 100%; fourth heart sounds were somewhat less frequent, varying from 20% to 60%.
		Unlike athletic heart syndrome, which reflects the heart's normal adaptation to strenuous physical activity, HCM is characterized by profound hypertrophy, which usually occurs at the expense of the LV cavity, asymmetrical septal hypertrophy, and myofibrillar disarray.
	www.physsportsmed.com /issues/2002/07_02/puffer.htm (3641 words)

	eMedicine - Heart Block, Second Degree : Article by David FM Brown, MD (Site not responding. Last check: 2007-11-07)
		For patients with infranodal second-degree heart block, atropine generally is ineffective.
		The most important complication of second-degree heart block is progression to complete heart block with associated cardiovascular collapse.
		Mobitz II block is a more dangerous entity, as it progresses more frequently to complete heart block and cardiovascular collapse.
	www.emedicine.com /emerg/topic234.htm (1632 words)

	American Journal of Critical Care: Heart blocks - ECG Puzzler - second-degree atrioventricular block type II (Site not responding. Last check: 2007-11-07)
		In second-degree AV block type II (Mobitz II), the PR interval of the conducted P wave will be constant for each QRS complex.
		In this case, the block is continuous with a 3 to 1 conduction of P waves to the QRS complexes, resulting in a ventricular rate of fewer than 40 beats per minute.
		Apply multifunction pads to the patient to prepare for transcutaneous pacing at the bedside, because a permanent pacemaker may be necessary.
	www.findarticles.com /p/articles/mi_m0NUB/is_1_12/ai_96695981 (533 words)

	NEJM -- The natural history of primary first-degree atrioventricular heart block
		The long-term prognosis of first-degree heart block in the absence of organic heart disease has not been clearly defined.
		Although somewhat higher rates of morbidity and mortality from ischemic heart disease were observed in the cases than in the controls, the differences were not significant.
		In view of the prognostic findings and the rare occurrence of advanced degrees of heart block, we conclude that primary first-degree heart block with moderate PR prolongation is a benign condition.
	content.nejm.org /cgi/content/short/315/19/1183 (387 words)

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