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Topic: Heart block

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Second degree heart block

First degree heart block

Third degree heart block

Trifascicular heart block

AV node

Cardiology

Cardiac arrhythmia

Electrical conduction system of the heart

Cardiac pacemaker

Arrhythmia

Electrocardiogram

Dilated cardiomyopathy

Cardiomyopathy

Bradycardia

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	UMMC - Heart Block (Site not responding. Last check: 2007-10-20)
		Heart block is a disorder of the heartbeat.
		This interrupts the passage of impulses from the atria to the ventricles.
		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)

	Illness Encyclopaedia H - Heart Block
		The main symptoms of heart block are a slow or irregular heartbeat.
		Heart block is caused by damage to the tissue that passes the electrical signals through the heart.
		Heart block may also be caused by problems that have been there from birth (congenital heart block).
	www.britain.tv /health_illness_encyclopaedia_h_heartblock.shtml (469 words)

	Wisconsin Heart - Treatment of heart and vascular disease - Heart Block
		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 /handler.cfm?event=practice,template&cpid=5611 (949 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)

	Discovery Health :: Diseases & Conditions :: heart block
		Heart block is a disruption in the relay of electrical signals that control activity of the heart muscle.
		A block that appears suddenly may be due to a new heart problem or the worsening of an old one.
		Heart blocks often have a certain pattern that the ECG machine traces on special paper.
	health.discovery.com /encyclopedias/illnesses.html?article=29&page=1 (644 words)

	Heart Block \| Your Health Connection
		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.
	www.yourhealthconnection.com /topic/heartblock (633 words)

	Heart Block, Abnormal Heart Rhythms, THE MERCK MANUAL OF HEALTH & AGING
		In heart block, the electrical currents that pass through the tissues between the atria and ventricles are delayed or blocked.
		Heart block is classified as first, second, or third degree based on its severity.
		A temporary pacemaker may also be used when doctors think that heart rhythm is likely to return to normal after the cause of the heart block resolves—for example, after a person recovers from a heart attack or after digoxin is discontinued.
	www.merck.com /pubs/mmanual_ha/sec3/ch47/ch47g.html (443 words)

	BHF Any Questions? - Heart Block (Site not responding. Last check: 2007-10-20)
		Heart block happens when the heart tissue that carries the electrical impulses is diseased.
		First degree heart block means that the impulses that are carried from the atria (upper chambers) to the ventricles (lower chambers) are delayed in a consistent manner.
		Second degree heart block means that there is intermittent failure in the way electrical impulses are transmitted from the atria (upper chambers) to the ventricles (lower chambers).
	www.bhf.org.uk /questions/index.asp?secondlevel=1161&thirdlevel=1298 (757 words)

	Dorlands Medical Dictionary
		congenital complete heart block, third degree atrioventricular block that presents in the fetal or neonatal period and is caused by defective development of the atrioventricular junctional tissue; it may be associated with other cardiac anomalies.
		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.
	www.mercksource.com /pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_b_16zPzhtm (4158 words)

	Heart Block
		Heart rate and rhythm are normal, and there may be nothing wrong with the heart.
		Complete heart block is most often caused in adults by heart disease or as a side effect of drug toxicity.
		In this condition, the normal heartbeat passing from the heart's upper to lower chambers is interrupted.
	www.americanheart.org /presenter.jhtml?identifier=992 (301 words)

	p020703b - Hyperthyroidism and Heart Block
		In view of the potential aggravation of atrioventricular conduction disturbance by beta adrenergic blocking agents, thyrotoxic patients should be carefully screened for electrocardiographic evidence of conduction disturbance before the administration of such drugs.
		The A-V nodal block was reversible with cure of the primary endocrine disease.
		In one patient, a left bundle-branch block and transient complete heart block with Stokes-Adams episodes also occurred, although there was no verifiable evidence of acute inflammatory disease.
	www.emory.edu /WHSCL/grady/amreport/litsrch02/p020703b.html (343 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 (651 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)

	THE MERCK MANUAL, Sec. 16, Ch. 205, Arrhythmias
		The PR interval is prolonged in acute rheumatic fever and sarcoid heart disease and may have medicolegal implications for employment and insurance purposes.
		In third-degree heart block, there is no electrical communication between the atria and the ventricles.
		Complete heart block due to digitalis responds to discontinuation of the drug and cautious re-institution at a lower dose; temporary pacing may be needed in the interim.
	www.merck.com /mrkshared/mmanual/section16/chapter205/205k.jsp (509 words)

	Heart block - The Doctors Lounge(TM)
		AV (atrio-ventricular) block occurs when an atrial impulse is conducted with delay or fails to conduct to the ventricle at a time when the AV node should not be refractory.
		The site of block may be the AV node (as occurs in congenital heart block), or within the His-Purkinje system (typical for acquired heart block).
		In complete heart block, the atrial rate typically exceeds the ventricular rate, with no fixed relation between atrial and ventricular activity (AV dissociation), and the ventricular rate usually is regular, owing to the regularity of the escape rhythm focus.
	www.thedoctorslounge.net /cardiology/diseases/heart_block.htm (571 words)

	BHF Any Questions? - Heart block (Site not responding. Last check: 2007-10-20)
		Heart block occurs when there is an interruption in the electrical conduction of the heart.
		Heart block may also occur after heart surgery and in this case may be either temporary or permanent.
		Treatment may include adjusting the medications or in certain cases, such as Mobitz type II block and complete heart block, a pacemaker may be necessary.
	www.bhf.org.uk /questions/index.asp?secondlevel=1154&thirdlevel=1195 (490 words)

	Bundle Branch Block - Texas Heart Institute Heart Information Center
		Sometimes the electrical impulse cannot travel throughout the heart because part of the heart's conduction system is "blocked." If an impulse is blocked as it travels through the bundle branches, you are said to have bundle branch block.
		After a heart attack, your heart is fragile, and bundle branch block may cause a very slow heart rhythm (bradycardia).
		Texas Heart Institute, Texas Heart Institute Journal, THI, Heart Owner's, The Heart of Discovery, and Leading With the Heart are members of the family of trademarks of the Texas Heart Institute.
	www.tmc.edu /thi/bbblock.html (809 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)

	U-M CVC - Heart Block (Site not responding. Last check: 2007-10-20)
		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)

	eMedicine - Heart Block, Third Degree : Article by David FM Brown, MD (Site not responding. Last check: 2007-10-20)
		Pathophysiology: Third-degree heart block is caused by conduction block at the level of the AV node, the His bundle, or the bundle branch-Purkinje system.
		When the block is at the level of the AV node, the escape rhythm generally arises from a junctional pacemaker with a rate of 45-60 beats per minute.
		Cardiology consultation is indicated for all patients with third-degree heart block.
	www.emedicine.com /emerg/topic235.htm (1896 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)

	Causes of Heart block - CureResearch.com
		Heart block as a complication: Other conditions that might have Heart block as a complication might be potential underlying causes of Heart block.
		Heart block as a symptom: Conditions listing Heart block as a symptom may also be potential underlying causes of Heart block.
		Related information for causes of Heart block: Further relevant information on causes of Heart block may be found in the risk factors for Heart block and underlying causes of Heart block.
	www.cureresearch.com /h/heart_block/causes.htm (302 words)

	Heart, heart in hand quilt block (Site not responding. Last check: 2007-10-20)
		The heart block makes a dandy quilt border, and the hand block is fun to use for a quilt with an international theme.
		The finished size of the hand block (or the Heart in Hand block) is 4-inches by 4-inches (not including the 1/4-inch seam allowance all around).
		The heart block is sewn in as patch number seven (7).
	www.winnowing.com /heart.html (262 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).
		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).
		Patients with either type of heart block or those who have symptoms because the ventricle is not beating fast enough to meet blood demands may need a pacemaker (Fig 1).
	www.apma-nc.com /PatientEducation/heart_block.htm (603 words)

	Pieced Heart Block
		Using the 52 heart squares and 24 background squares, arrange them into a heart on pellon fleece.
		Note that two squares, one of heart fabric and one of background fabric will form the half square triangles on the edge of the heart.
		You want enough contrast between the heart and background fabrics so that the edge of the heart is noticeable.
	www.sandybonsib.com /pattern_archive_Feb02.htm (292 words)

	Heart Block, Congenital Synonyms, Eastern Carolina
		It is possible that the main title of the report Heart Block, Congenital is not the name you expected.
		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.
	www.uhseast.com /145607.cfm (484 words)

	Heart Signature Block
		These blocks were done by a group of ppl from Creatively Quilting and Sewing.
		Blocks have been assblemed and are awaiting a border once done they will be donated to Ronald McDonald's House.
		Beginner: This is an 8x8 block finished block made up of half square triangles, squares, and stripes.
	www.geocities.com /kwiltykats/Heart_sign_block/heart_sign_block.htm (232 words)

	Heart Block: June 2004
		The author of this blog was diagnosed with Complete or Third Degree Heart Block and received a Medtronic pacemaker on Jan 30, 2004.
		One of the unfortunate circumstances surrounding my episode of heart block in January was that I did not have insurance coverage.
		I'm still not covered for heart block, and my cardiologist recently asked me to have some chest x-rays to check on the aortic lead that might be out of place.
	heartblock.blogspot.com /2004_06_01_heartblock_archive.html (666 words)

	Autoantibody-associated Congenital Heart Block: Outcome in Mothers and Children -- Waltuck and Buyon 120 (7): 544 -- ...
		Heart block was identified in most of the fetuses before birth.
		is not sufficient to cause congenital heart block.
		Connective-tissue disease, antibodies to ribonucleoprotein, and congenital heart block.
	www.annals.org /cgi/content/full/120/7/544 (5743 words)

	Second Degree Heart Block - Get Online Degree (Site not responding. Last check: 2007-10-20)
		Heart Block, Second Degree - Second-degree heart block or second-degree atrioventricular (AV) block refers to a disorder of the cardiac conduction system in …
		Second degree heart block Second degree heart block is a disease of the electrical conduction system of the heart.
		… Definition: Second degree AV block is also known as Second Degree Type I, … of progressing into a third degree heart block or ventricular standstill.
	www.education.ru.com /second-degree-heart-block.html (586 words)

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