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| | World Intellectual Property Organization |
 | | Each contraction and relaxation of the cardiac muscle, which is a result of depolarization and repolarization waves transferred through the electrical conducting system of the heart, causes a rise in the internal pressure within the cardiac chambers (atria and/or ventricle), and a consequent drop of pressure as the chamber returns to its original relaxed condition. | | | Moreover, when the cardiac contraction is normal in its strength, as expected in normal viable conditions the rise and consequent drop in LVP are significantly large showing a substantial LVP change, whereas when the contraction is weak, as in the cases of tachycardia or fibrillation, LVP changes are significantly smaller. | | | Left ventricular pressure (LVP) is used for the assessment of the mechanical hemodynamic performance of he heart. |
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http://www.wipo.int/ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/58517.010816&ELEMENT_SET=DECL
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| | THE MERCK MANUAL, Sec. 16, Ch. 203, Heart Failure |
| | It is generally associated with prolonged ventricular relaxation time, as measured during isovolumic relaxation (the time between aortic valve closure and mitral valve opening when ventricular pressure falls rapidly). | | | Serum levels of atrial natriuretic peptide (released in response to increased atrial volume and pressure load) and brain natriuretic peptide (released from the ventricle in response to ventricular stretch) are markedly increased in patients with CHF. | | | The drug is widely prescribed in the USA, although its role continues to be debated and its usefulness in HF in the absence of atrial fibrillation is controversial. |
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http://www.merck.com/pubs/mmanual/section16/chapter203/203a.htm
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| | eMedicine - Premature Ventricular Contraction : Article by Sarah Stahmer, MD |
| | Symptoms pertinent to the management of the PVC's are those that suggest underlying ischemic cardiac disease, such as chest pain or its anginal equivalent, or those suggesting hemodynamic compromise, such as lightheadedness or syncope. | | | Closely monitor and admit to an appropriate monitored setting patients with presentations that indicate an ischemic basis for their PVCs (eg, chest pain, dyspnea, syncope) or who are hemodynamically unstable while in the ED. | | | Lidocaine is the drug of choice (DOC) in the setting of complex ectopy in the peri-MI period if the patient is symptomatic, yet no firm evidence supports this practice. |
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http://www.emedicine.com/emerg/topic773.htm
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| | Premature Ventricular Contraction |
| | The first approach that a specialist takes is to ensure that the PVCs are not occurring due to some other problem with the heart, and from what you say it sounds as though you are fine from that point of view. | | | In this way our body adjusts the pulse rate according to the amount of work the heart is required to do at any point. | | | These spread the electrical impulse arising from the heart's natural pacemaker to all areas of the heart muscle. |
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http://www.netdoctor.co.uk/ate/heartandblood/201172.html
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| | PVC's and hormone flucuations |
| | I went to visit my surgeon for my follow-up that day, and of course, by the time he got me in the office they'd stopped and my pulse was nice and relaxed. | | | Sometimes I really get like dazed and confused with this to the point I have had to have someone come and get me. This past week has been just unreal no pressure on chest and feel almost normal but afraid no they will be back! | | | Two & a half weeks ago, I started to experience frequent "palpitations",tightness in the chest, tiredness & SOB. |
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http://www.medhelp.org/forums/cardio/messages/34785.html
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| | Management of Patients With Valvular Heart Disease Guidelines:General Principles |
| | Although echocardiography usually provides more specific and often quantitative information about the significance of a heart murmur and may be the only test needed, the electrocardiogram (ECG) and chest x-ray are readily available and may have been obtained already. | | | Posteroanterior and lateral chest roentgenograms often yield qualitative information on cardiac chamber size, pulmonary blood flow, pulmonary venous pressures, pulmonary vascular redistribution, and cardiac calcification in patients with cardiac murmurs. | | | , when the ventricular pressure rises sufficiently to open the semilunar valve. |
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http://www.acc.org/clinical/guidelines/valvular/jac5929fla3.htm
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| | YSM CaseBook: Edie Earl |
| | Premature ventricular contractions (PVCs) have been studied intensively in the medical literature. | | | The intermittent sensation of a pause followed by an accentuated beat is consistent with a ectopic beats rather than a sustained arrhythmia. | | | They are often associated with stimulants such as caffeine, alcohol, or tobacco and sometimes with non-cardiac intercurrent illnesses such as influenza or bacterial pneumonia. |
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http://info.med.yale.edu/casebook/cardio/earl/discussion.html
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| | Echocardiography |
| | An echocardiographic technique to measure the left ventricular ejection time (LVET) in the postextrasystolic beat was shown to be more sensitive. | | | In hypertrophic obstructive cardiomyopathy there is a typical postextrasystolic pressure change in the left ventricle and in the aorta. | | | Palpating the carotid pulse may provide evidence of the systolic pressure drop. |
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http://www2.umdnj.edu/~shindler/ihss.html
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| | Texas Arrhythmia Institute - Premature Beats - www.txai.org |
| | They may arise from a ventricular focus with enhanced automaticity or may represent a form of reentry within the His-Purkinje system. | | | Working to prevent Sudden Cardiac Death by promoting a better understanding of Arrhythmias through education and research. | | | Premature contractions in the atria (PAC) are also rather common. |
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http://www.txai.org/edu/irregular/premature_beats.htm
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| | OUTLINE OF INTERACTIVE ELECTROCARDIOGRAPHYI |
| | With AV conduction less than 1:1, the ventricular rate will be slower than the atrial rate. | | | The QT interval is affected by various medications and the patient’s autonomic tone, gender and heart rate. | | | Suspect clinically in patient with acute Inferior Wall Myocardial Infarction who has hypotension and distended neck veins. |
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http://www.meddean.luc.edu/lumen/MedEd/MEDICINE/medclerk/ekg.htm
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| | Genesis Health System - Detailed Disease Info - Ventricular Ectopic Beats |
| | If there is no evidence of heart disease, there is little or no danger to the individual. | | | Some services or procedures listed here may not be provided by Genesis Health System entities. Please consult your medical professional for further information. | | | Ventricular ectopic beats are common and do not indicate a problem in people without heart disease. |
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http://www.genesishealth.com/micromedex/detaileddisease/00070130.aspx
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| | EKG Review |
| | EKG Characteristics and Nursing Interventions: Same as Bigeminy PVC. | | | Notify the MD if this is a new arrhythmia. | | | Possible causes are drug interaction, caffeine, fatigue, cardiac ischemia, atrial enlargement, alcohol, anterior myocardial infarction, emotional stress and tobacco. |
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http://www.ce5.com/ekg500.htm
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| | Bigeminy - Wikipedia, the free encyclopedia |
| | Bigeminy is a heart arrhythmia in which heart beats occur in pairs with a pause between each pair. | | | Following the PVC there is a pause and then the normal beat returns - only to be followed by another PVC. | | | A typical example is ventricular bigeminy which is a normal beat followed by a premature ventricular beat, also known as a premature ventricular contraction (PVC). |
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http://www.wikipedia.org/wiki/Bigeminy
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| | Untitled Document |
| | The heart beats so fast that the heart muscle cannot relax between contractions and it does not receive adequaate blood for pumping. | | | Ventricular fibrillation is often associated with acute ischemic events (ischemia involves the deprivation of oxygenated blood to an area of tissue), and with chronic ischemic heart disease. | | | PVCs are less serious and usually do not need treatment. |
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http://www.heart-help.net/arrhythmia3.html
(636 words)
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| | Basic Electrocardiography |
| | Right Ventricular Hypertrophy (RVH): When right ventricular muscle mass become great enough, it causes alterations in the positivity of the right chest leads. | | | These premature atrial depolarization waves may be conducted to ventricular tissue before complete repolarization has occurred, and in such cases, the subsequent ventricular depolarization may take place by an abnormal pathway, generating a wide, bizarre QRS complex. | | | Background: Pre-excitation syndromes refer to clinical Conditions in which the wave of depolarization bypasses the atrioventricular node as it passes from the atria to the ventricles. |
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http://www.sh.lsuhsc.edu/fammed/OutpatientManual/BasicECG.htm
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| | Articles - Ventricle (heart) |
| | Ventricular assist device (VAD), a temporary 'blood-pumping' device for patient use while the heart is 'healing' or 'being fixed' | | | Pulmonary hypertension, which often leads to hypertrophy of the right ventricle (Ventricular hypertrophy) | | | Ventricles have thicker walls than the atria, and thus can create the higher blood pressure. |
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http://www.lastring.com/articles/Left_ventricle
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| | Zoology 214 Lecture 36: November 1, 2001 |
| | As the ventricles relax during diastole, blood is drawn into the ventricles (from atria and vena cavae) | | | During fibrillation, the heart does not pump any significant amount of blood | | | Cardiopulmonary resuscitation (CPR) compresses the heart and induces some blood flow |
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http://www.humboldt.edu/~bao3/214lectures/214Lecture36.htm
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| | Types of Arrhythmia in Children |
| | Your child's doctor may recommend more tests to make sure your child's heart is OK. | | | Eliminating the abnormal pathway by passing energy through a catheter may be needed. | | | Occasionally premature beats may be caused by disease or injury to the heart. |
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http://www.americanheart.org/presenter.jhtml?identifier=7
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| | Chikh1 - Abstract |
| | Algorithmic sequential decision making in the frequency domaine for life threating ventricular arrhythmias and initiative artefacts: A diagnostic system. | | | His area of research interests includes biomedical signal processing and microcomputer-based medical instrumentation. | | | Understanding and treatment of this disorder would be improved if patterns of electrical activation could be accurately identified and studied during its occurrence. |
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http://www.webcentre.ru/~eeaa/ejta/eng/abstracts2004eng/chikh1eng.shtml
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| | Myocardial infarction: Killip class, premature ventricular contraction, a previous MI and depression increased the risk ... |
| | history of previous MI, left ventricular ejection fraction, Killip class, frequency of premature ventricular contraction on Holter monitoring, thrombolytic therapy, use of beta-blockers or ACE inhibitors | | | Myocardial infarction: Killip class, premature ventricular contraction, a previous MI and depression increased the risk of dying. | | | Killip class, previous myocardial infarction, depression, premature ventricular contractions |
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http://www.eboncall.org/CATs/1377.htm
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| | Group 2 Escape and premature beats |
| | The usual pacemaker fails, so a slower pacemaker fires at its inherent rate. | | | PVCs that occur three (3) or more in a row (ventricular tachycardia), multifocal PVCs (different shapes), or PVCs that land on a previous T wave (R on T phenomenon) can be dangerous ion a patient with underlying heart disease. | | | The bottom line for Group 2 arrhythmias is that the rhythm is fairly regular - then you will notice an early or late beat; try to figure out whether that beat is a premature atrial contraction, premature ventricular contraction, etc. |
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http://www.fammed.wisc.edu/pcc/ecg/rhythm.group2.html
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| | [No title] |
| | And what other (non tricyclic) antidepressant could I take that would not cause arrythmias? | | | These comments are made for the purpose of discussion and should NOT be used as recommendations for or against therapies or other treatments. | | | A lot of patients feel worse on the medications than they do with the extra beats. |
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http://www.druginfonet.com/faq/new/DISEASE_FAQ/Premature_Ventricular_Contractions.htm
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| | PREMATURE EJACULATION :: General |
| | For those men, condoms that prolong erection have been introduced. | | | But for men who suffer from premature ejaculation - the most common sexual dysfunction among men of all age groups - it can mean the world. | | | Estimates from the American Urological Association and medical studies say 20% to 34% of men of all ages suffer from premature ejaculation, but reports suggest that less than 12% ever receive any sort of treatment for it. |
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http://epackbiz.com/blog/main/category/general
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| | ECG Laboratory Assignment |
| | Indicate where during the ECG cycle the second heart sound would be heard (as ventricles relax) | | | Record and print a copy of an ECG immediately after exercise and compare to the same subject's resting ECG. | | | It does NOT measure the contraction events - although it is important to understand that the depolarization of the myocardial cells is the trigger for contraction. |
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http://www.personal.psu.edu/faculty/d/y/dys100/ecg.htm
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| | Bloat |
| | If it is present, intravenous medications are needed to stabilize the rhythm. | | | There is a special very dangerous rhythm problem, called a "premature ventricular contraction" or "pvc," associated with bloat and it must be ruled out. | | | It undergoes a normal rhythm of contraction, receiving food from the esophagus above, grinding the food, and meting the ground food out to the small intestine at its other end. |
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http://www.marvistavet.com/html/body_bloat.html
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| | PREMATURE VENTRICULAR CONTRACTIONS |
| | PVCs may be controlled with anti-arrhythmic medications if symptoms become disruptive. | | | Healthy persons with no symptoms of heart or lung disease need no specific treatment. | | | PVCs occur more frequently among persons with heart disease such as ischemia (decreased blood flow to the heart muscle) or persons with congestive heart failure (decreased pumping efficiency of the heart). |
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http://www.apma-nc.com/PatientEducation/premature_ventricular_contractio.htm
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| | health.iafrica.com doc online ask the doctor cardiac diseases Premature ventricular contractions |
| | Premature ventricular contractions, also called ventricular ectopic beats, may or may not cause symptoms or be of any clinical significance. | | | If they cause symptoms, they may need treatment, but at the moment there is no evidence that treatment makes any difference to the outcome of the underlying condition, and some drugs may actually worsen the outcome. | | | Treatment should only be started if the symptoms are intolerable and beta-blockers are generally used in all except those who cannot take these drugs. |
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http://health.iafrica.com/doconline/qa/cardiac/premventcontr.htm
(497 words)
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| | Premature Ventricular Contractions |
| | PVC's may occur in singles, couplets or triplets; or in bigeminy, trigeminy or quadrigeminy. | | | They also occur in diseased hearts and from drug (such as digitalis) toxicities. | | | For example, an increase in circulating catecholamines can cause PVCs. |
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http://www.rnceus.com/ekg/ekgpvc.html
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| | Premature Ventricular Contraction Information by MedicineNet.com |
| | These premature discharges are due to electrical “irritability” of the heart muscle of the ventricles, and can be caused by heart attacks, electrolyte imbalances, lack of oxygen, or medications. | | | The heartbeat (pulse) that we feel is caused by the contraction of the ventricles. | | | This resetting cause a brief pause in heartbeat, and some patients report feeling the heart briefly stopping after a premature ventricular contraction. |
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http://www.medicinenet.com/premature_ventricular_contractions/article.htm
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| | endocar |
| | The essentials of treatment are 1) to slow the progression of clinical signs early with vasodilators, 2) control pulmonary edema with vasodilators and diuretics when it occurs, and 3) reduce the heart rate and increase contractility later in the course of the disease when vasodilators and diuretics begin to lose their effectiveness. | | | Infrequently, other arrhythmias such as atrial fibrillation or third degree AV block are found. | | | Chordae tendineae may be ruptured, and the atrioventricular leaflets may prolapse into the atrium during ventricular contraction. |
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http://www.gsdhelpline.com/endocar.htm
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| | Frank-Starling law of the heart - Wikipedia, the free encyclopedia |
| | Effectively, this means that the force of contraction will increase as the heart is filled with more blood and is a direct consequence of the effect of an increasing load on a single muscle fibre. | | | The Frank-Starling law of the heart (also known as Starling's law) states that when the diastolic filling of the heart is increased or decreased with a given volume, the volume of blood which is then ejected from the heart increases or decreases by the same amount. | | | The force that any single muscle fibre generates is proportional to the initial sarcomere length (known as preload), and the stretch on the individual fibres is related to the end-diastolic volume of the ventricle. |
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http://en.wikipedia.org/wiki/Frank-Starling_law_of_the_heart
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| | arrhythmia |
| | Or they may be ventricular, caused by problems in the pacemaking center of the heart (the atrioventricular node) or by irritability of the heart muscle itself. | | | The most common arrhythmia of all is of course the premature ventricular contraction (PVC), which I suppose just about everybody has to some degree at some time. | | | Because the heart pacemaker maintains its normal rhythm despite a premature contraction, there is a "compensatory pause" in the rhythm of the heart while it waits to resume or pick up the beat (much as a singer pauses to come in correctly on the beat). |
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http://sleeptight.com/EncyMaster/A/arrhythmia.html
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| | Cardiac Arrhythmia - Premature Ventricular Contractions |
| | Patients with long QT Syndrome or who have an elongated QT Interval through drug therapy or some other complaint are at a higher risk. | | | If more than one potential focus exists then the patient will exhibit more than one morphology at different times. | | | The wide QRS complex will either have initially a high-energy negative, or positive, deflection. |
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http://www.cardionetics.com/docs/healthcr/ecg/arrhy/0402_bd.htm
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| | premature ventricular contraction self-test device |
| | Does any of you know whether there is any device/tool that can be used by the patient at home for self-test/monitor. | | | Does any of you know whether there is any device/tool = that can be used by the patient at home for self-test/monitor. | | | Hello Listers, A relative of mine was diagnosed with "premature ventricular contraction". |
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http://www.thehelparchive.com/new-469147-9.html
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| | IngentaConnect Premature Ventricular Contraction-Induced Concealed Mechanical Br... |
| | LV dysfunction and concealed mechanical bradycardia resolved in a patient with idiopathic dilated cardiomyopathy after the focal source of PVCs in the LV was eliminated by radiofrequency ablation (RFA). | | | Premature Ventricular Contraction-Induced Concealed Mechanical Bradycardia and Dilated Cardiomyopathy: | | | In a subset of patients with idiopathic dilated cardiomyopathy with frequent isolated PVCs, RFA of the arrhythmic focus restores normal LV function that can be long lasting. |
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http://www.ingentaconnect.com/content/bsc/jce/2005/00000016/00000001/art00021
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| | * Systole - (Disease): Definition |
| | These occur after a loss or sleep too much caffeine, nicotine, or too much alcohol... | | | Usually this feeling is caused by an extra beat (premature beat or extrasystole) that happens earlier than the next normal beat, and results in a pause until the next normal beat comes through... | | | Premature contractions or extrasystoles are contractions tat occur before the next expected contraction in a series of cardiac cycles. |
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http://www.bestknows.com/disease/systole.html
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| | YSM CaseBook: Edie Earl |
| | Which of the following does the EKG inidicate as a couse for Edith's symptom?? | | | The lyric by Lorenz Hart, "I took one look at you, that's all I had to do, and my heart stood still," from the song, "My Heart Stood Still," emphasizes the relationship of PVCs to emotion and other adrenergic stimuli, such as caffeine, that cause depolarization of ventricular purkinje cells. | | | The wide QRS complex coming after a shortened RR interval followed by a long compensatory pause characterizes a premature ventricular contraction or PVC. |
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http://info.med.yale.edu/casebook/cardio/earl/test_results.html
(96 words)
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| | Heart Health Condition Center: Heart rhythm problems |
| | Many people have an occasional PVC without any symptoms; however, if you have a history of heart disease, or if you have frequent PVCs, your health care team needs to know. | | | Sometimes atrial fibrillation occurs in healthy people, but usually it happens if you also have high blood pressure, a history of valve or heart disease, coronary artery disease or hyperthyroidism. | | | When your ventricles are fibrillating, they are not able to pump blood to your body. |
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http://www.medformation.com/ac/hearthealth.nsf/page/hrp
(667 words)
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| | Lars Erickson - Ventricular Premature Beats |
| | Benign VPBs are quite common and may actually occur from time to time in most people, although they can occur with great frequency in some people (even every other beat for extended periods of time). | | | Benign VPBs are of no importance, and do not require treatment unless they cause symptoms (palpitations, or occasionally a cough triggered by the vigorous post-premature beat). | | | On an ECG, benign VPBs generally all have the same appearance (morphology), and one does not see them in conjunction with more serious arrhythmias (such as ventricular tachycardia). |
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http://www.larserickson.com/PatientInfo/VPBs.htm
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| | LearnWell EKG Quiz 5 |
| | Is ventricular tachycardia a rapid deadly rhythm where the patient often | | | D. There is no rate or QRS specification | | | C. A type of ventricular tachycardia than changes from upward to |
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http://www.ce5.com/ekg15.htm
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| | Re: premature ventricular contractions |
| | The best way to handle PVC's is to develope a coping strategy to deal with them in order to control the anxiety associated with them which in turn may cause more PVC's. | | | Why is it at times, I tend to get more Palpitations when I stress my heart out, meaning I may not get any until I crawl out of bed or in the shower. | | | I am one of these chronic PVC sufferers. |
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http://www.medhelp.org/forums/cardio/archive/13356.html
(469 words)
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