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Topic: First degree heart block

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Heart block

Type 1 Second degree heart block

Third degree heart block

Trifascicular heart block

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Sinoatrial node

Cardiac arrhythmia

Electrical conduction system of the heart

Asystole

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Pulseless electrical activity

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	First degree heart block - Wikipedia, the free encyclopedia
		In first degree heart block, the disease is almost always at the level of the atrioventricular node (AV node).
		First degree heart block may be due to conduction delay in the AV node, in the His-Purkinje system (made up by the bundle of His and the Purkinje fibers), or a combination of the two.
		In a subset of individuals with the triad of first degree heart block, right bundle branch block, and either left anterior or left posterior fascicular block (known as trifascicular heart block) may be at an increased risk of progression to complete heart block.
	en.wikipedia.org /wiki/First_degree_heart_block (556 words)

	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 (405 words)

	Heart Block
		Heart block is a term that we use to describe a condition where there is an abnormality in the conduction (or electrical) system of the heart.
		First-degree heart block is a term used to describe an unusual delay between the contraction of the atria and ventricles.
		When heart block causes the heart rate to be too slow and the patient feels tired, or faint or the heart becomes enlarged, we need to treat this.
	www.carson-appleton.com /heart_block.htm (707 words)

	Heart Block: Encyclopedia of Medicine
		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.
	health.enotes.com /medicine-encyclopedia/heart-block (511 words)

	[No title]
		Heart block, First Degree INTRODUCTION Background: First degree heart block, or first degree AV block, is a condition that results in prolongation of the PR interval on electrocardiogram (ECG) to >0.20 seconds.
		Mortality/Morbidity: Morbidity and mortality from heart disease appears to be unaffected by the presence of first degree block.
		Mobitz I second degree AV block, or Wenckebach block, is characterized by progressive prolongation of the PR interval causing progressive RR interval shortening until a P wave fails to conduct to the ventricle.
	www.swcp.com /~tanman/ho/CH-HEARTBLOCK.txt (3081 words)

	Heart Block -- Recommendations and Resources (Site not responding. Last check: 2007-11-01)
		Third degree heart block, also known as ''complete heart block'', is a disease of the electrical system of the heart, in which the impulse generated in the top half of the heart (typically the SA node in the right atrium) does not propagate to the left or right ventricles.
		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.
	www.becomingapediatrician.com /health/70/heart-block.html (1334 words)

	Cardiology Advisor 2005.2: Heart Block
		Heart block is a disorder of the heartbeat.
		In second-degree heart block, some of the atrial impulses fail to reach the ventricles and cause the pulse to become slow or irregular.
		A block that appears suddenly may be a sign of a new heart problem or worsening of an existing one.
	www.fairview.org /healthlibrary/content/ca_avblock_car.htm (475 words)

	Wisconsin Heart - Treatment of heart and vascular disease - Abstract - Heart Block
		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 a disorder of impulse conduction, meaning that an electrical impulse is impaired from traveling along its normal pathway.
		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 (940 words)

	Heart block - second degree heart block
		Blocks that complete heart heart condition left bundle branch block block treatment occur within the sinoatrial node heart + tulipquilt block (SA node) are described as SA nodal blocks.
		The difference between SA node block and SA node suppression is that in SA node block an electrical definition heart block impulse is generated by the SA node that doesn't conduct to the ventricles.
		Of electrical heart block these types of infrahisian block, Mobitz II heart block is considered most important because of the possible progression to complete heart block.
	www.medicalgeo.com /Med-Diseases-H---Hi/Heart-block.html (480 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.
		First degree AV block usually results from conduction delay within the AV node but rarely from intra-atrial delay, or delay within the His-Purkinje system (often seen in conjunction with bundle branch block) may be responsible.
		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 (544 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: Abnormal Heart Rhythms: Merck Manual Home Edition
		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 /mrkshared/mmanual_home2/sec03/ch027/ch027j.jsp (442 words)

	CardioVascular Associates, P.C., birmingham, AL, Alabama, heart, cardiology, cardiologists, electrophysiology, ...
		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.
		Heart block results in an abnormality or disturbance in the rate or rhythm of the heartbeat.
		Heart block, especially in children, may also be congenital, meaning present when a person is born.
	www.cvapc.com /handler.cfm?event=practice,template&cpid=1197 (856 words)

	Heart1.com - Atrioventricular Block/Heart Block
		Atrioventricular (AV) block, also called heart block, is a condition in which the electrical impulses that normally generate a heartbeat are not functioning correctly.
		First Degree: With an incidence of 1:1000, this type of AV block is very common, and is so slight that it often goes unnoticed.
		First degree heart block is often found in well-conditioned athletes, presumably because their hearts are more efficient and require fewer heartbeats.
	www.heart1.com /care/condition20.cfm/33 (696 words)

	Categories of Arrhythmias - Texas Heart Institute Heart Information Center
		It happens when the electrical impulse that signals the heart to contract is not formed in your heart's natural pacemaker, the sinoatrial node (SA node), or is not sent to the heart's lower chambers (the ventricles) through the proper channels.
		Heart block takes place when the SA node sends its electrical signal properly, but the signal is not sent through the atrioventricular (AV) node or lower electrical pathways as quickly as it should be.
		There are several types of heart block, and they are named by their degree of severity.
	texasheart.org /HIC/Topics/Cond/arrhycat.cfm (1186 words)

	[No title]
		Heart block is a condition where the heart beats irregularly or much more slowly than normal.
		Third degree heart block is when the electrical signals don’t travel between the upper and lower chambers of the heart.
		Heart block is caused by damage to the tissue that passes the electrical signals through the heart.
	www.nhsdirect.nhs.uk /articles/article.aspx?printPage=1&articleId=188 (799 words)

	U-M CVC - Heart Block (Site not responding. Last check: 2007-11-01)
		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_ECG3 (Site not responding. Last check: 2007-11-01)
		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.
		Complete heart block is most often caused in adults by heart disease or as a side effect of drug toxicity.
	www.nku.edu /~dempseyd/HEART_ECG3.htm (288 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)

	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.
		First degree AV block is when the P-R interval is longer than 0.2 seconds, and can be caused when the atrial depolarization rate is too fast.
		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)

	THE MERCK MANUAL, Sec. 16, Ch. 205, Arrhythmias
		Even when first-degree heart block occurs in the setting of disease, treatment is not mandatory but may suggest further investigation.
		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 /pubs/mmanual/section16/chapter205/205k.htm (509 words)

	ECG Monitoring in Theatre (page 4)
		It is the combination of right bundle branch block and block of the left anterior or posterior fascicle and appears on the ECG as a RBBB pattern with axis deviation.
		Tri-Fascicular Block This is the term sometimes used to indicate the presence of a prolonged PR interval together with a bi-fascicular block.
		Asymptomatic 2nd degree heart block or first degree block with symptoms suggestive of sick sinus syndrome (intermittent tachycardia and bradycardia) plus documented relief of symptoms with a temporary pacing wire.
	www.nda.ox.ac.uk /wfsa/html/u11/u1105_04.htm (1454 words)

	Heart Block
		When the heart is functioning well, the electrical signals are transmitted smoothly from the atria to the ventricles, and cause rhythmic muscle contractions that pump blood to the rest of the body.
		Heart block occurs when the electrical signals from the sinoatrial node are too slow (bradycardia).
		First- and second- degree heart block should be diagnosed by your physician, who will help you determine the best course of treatment, if any.
	healthlibrary.epnet.com /GetContent.aspx?token=9cc295f8-f3b0-4b15-99b3-beb1e6cbe599&chunkiid=96736 (784 words)

	HerbChina2000.com - Herbal Remedies - Heart block (Site not responding. Last check: 2007-11-01)
		The first reason is due to its excellent efficacy that has been evaluated.
		Symptoms depend on how severe the heart block is and in what part of the heart it occurs.
		If the heart block is severe enough, the heart rate will slow, and symptoms of low blood pressure or stroke will appear.
	www.herbchina2000.com /therapies/ACB.shtml (807 words)

	Heart Block, Congenital
		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.webmd.com /hw/heart_disease/nord530.asp (480 words)

	Abnormal rhythms - definitions
		- a conduction block within the AV node (or occasionally in the bundle of His) that impairs impulse conduction from the atria to the ventricles.
		Second-degree AV nodal block - the conduction velocity is slowed to the point where some impulses from the atria cannot pass through the AV node.
		Third-decree AV nodal block - conduction through the AV node is completely blocked so that no impulses are able to be transmitted from the atria to the ventricles.
	www.cvphysiology.com /Arrhythmias/A012.htm (480 words)

	BenHDo
		A catheter is placed in the bundle of His to determine the degree of heart block.
		degree heart blocks occur when the electrical impulses from the atria are blocked at the atrioventricular node or junction.
		degree heart blocks involve a complete blockage of the electrical impulse from the sinoatrial node at the atrioventricular junction, which results in no depolarization of the ventricles.
	bme.usc.edu /bme403/Section_3/heart_block.html (598 words)

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