• Study Resource
  • Explore Categories
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Single Preconditioning Stimulus Becomes
Single Preconditioning Stimulus Becomes

... Hemodynamics. Measurements of heart rate and mean arterial pressure were made in all groups at baseline (that is, before opening the chest), immediately before the sustained occlusion, 15 min after occlusion, at the end of the 30-min occlusion. 30 min after reperfusion, and at the end of the experim ...
pulmonary circulation
pulmonary circulation

... Pathological physiology of cardiovascular system 3. Congenital heart diseases Rácz Oliver, Sedláková Eva Institute of Pathological Physiology, Medical School, P.J. Šafárik University © Oliver Rácz 2011 ...
Public Summary Document
Public Summary Document

... using the Seattle Heart Failure Model (SHFM) scores, respectively, were small and nonsignificant. MSAC concluded that the clinical effectiveness of CCM therapy, particularly its effect on morbidity and mortality, remained uncertain. MSAC noted that the resubmission did not include new data from RCT ...
Detection and Imaging of Cardiac Allograft Vasculopathy
Detection and Imaging of Cardiac Allograft Vasculopathy

... advances in the understanding of the natural history, distribution, and morphology of CAV (16,17,20 –22,72,73). Serial IVUS imaging has shown that the dynamic process of coronary artery remodeling begins within the first year after transplantation (74). Initially, there is thickening of the coronary ...
Print - Circulation Research
Print - Circulation Research

... AV nodal facilitation. The atrium was paced at a constant basic cycle length of 500 msec. A premature atrial impulse (S2) was introduced to produce a selected A1A2 facilitation cycle after every 15 basic stimuli. A test impulse (S3) was then applied after each S2, and the AV nodal response to S3 was ...
Valvular Heart Disease
Valvular Heart Disease

... tricuspid valve, and 0.3% the pulmonic valve.3 A study of patients over 65 years old found that aortic stenosis was present in 2% overall, with a twofold increase in incidence for each 10 years of life.4 In 1999, the Framingham Heart Study reported a series of 3,589 color Doppler echocardiograms don ...
Heart Guide - Center for Plain Language
Heart Guide - Center for Plain Language

... confirm a diagnosis of ACS. The artery must then be reopened using medicines or angioplasty, in which a small balloon is inflated inside the artery to open it up. A wire mesh tube called a stent may also be placed in the artery to keep it open. ...
Oxidative stress and the role of downstream pathways in
Oxidative stress and the role of downstream pathways in

... cause of deaths in adults in the developed world is of cardiovascular origin. The main contributors to total cardiovascular mortality are atherosclerosis, ischemic heart disease and heart failure. Recently, an important role of free radicals has been implicated in these diseases. Potentially harmful ...
Pacemaker Timing - 123SeminarsOnly.com
Pacemaker Timing - 123SeminarsOnly.com

... below the programmed lower rate before pacing resumes. Hysteresis provides the capability to maintain the patient's own heart rhythm as long as possible, while pacing at a faster rate if the intrinsic rhythm falls below the hysteresis rate. The hysteresis rate is always < the lower rate limit. The l ...
PI LANOXIN (Digoxin) [PI] - Aspen Pharmacare Australia
PI LANOXIN (Digoxin) [PI] - Aspen Pharmacare Australia

... whether to treat with further digoxin, but toxic doses of other glycosides may cross-react in the assay and wrongly suggest apparently satisfactory measurements. Observations during the temporary withholding of digoxin might be more appropriate. Rapid intravenous injection – can cause vasoconstricti ...
What`s new in diagnosis and therapy of atrial fibrillation?
What`s new in diagnosis and therapy of atrial fibrillation?

... Management of atrial fibrillation (AF) regarding new diagnostic and therapeutic tools has constantly evolved over the last years. For paroxysmal AF, implantable loop recorders offer new options for better assessment of AF burden. For treatment, pulmonary vein (PV) isolation has evolved an accepted, ...
Morphology and Electrophysiology of the Mammalian
Morphology and Electrophysiology of the Mammalian

... described a spindle-shaped compact network of small cells. These cells were connected via “Knotenpunkten” in which four to five fibers were often joined together. It was apparently this characteristic that prompted him “for simplicity’s sake” to call this compact network “Knoten” (“node”). It must b ...
How much of the intra-aortic balloon volume is displaced towards
How much of the intra-aortic balloon volume is displaced towards

... In order to assess the effect of the IAB inflation separately from the combined effect of IAB inflation and diastolic recoiling of the aorta, recordings were made with the IABP operating in 1:1 and 1:2 with and without the artificial heart. When the balloon was simply pumping against standstill con ...
MR Imaging in the Electrophysiology (EP) Laboratory
MR Imaging in the Electrophysiology (EP) Laboratory

... including fluoroscopy or ICE though these solutions are imperfect. As real-time 3D MRI becomes available, it will become more important in providing real-time information regarding structure and function during RF procedures. RF energy delivery and posterior mediastinal injury An additional componen ...
Sudden Cardiac Death in the Young
Sudden Cardiac Death in the Young

... greater than that cited above for the general population, but this difference may in part be related to demographic factors correlated with sports participation (sex, age, ethnicity).47 Etiologies of SCD in the Young Athlete An early article investigating the etiology of SCD in the young athlete was ...
CMR Imaging of Edema in Myocardial Infarction Using Cine
CMR Imaging of Edema in Myocardial Infarction Using Cine

... zone (contrast-to-noise ratio: 37 ⫾ 13) in all animals and correlated well with the area of late gadolinium enhancement (R ⫽ 0.83, p ⬍ 0.01). In all patients, T2-STIR and bSSFP images showed regional hyperintensity in the infarction zone. Normalized contrast-to-noise ratios were not different betwee ...
Ebstein™s anomaly - Swiss Medical Weekly
Ebstein™s anomaly - Swiss Medical Weekly

... of the tricuspid leaflets to the underlying myocardium (failure of delamination), redundancy, fenestrations (accessory orifices), tethering of the anterior leaflet, right ventricular dysplasia and abnormalities of the distal attachments of the tricuspid valve [4]. The dysplastic tricuspid valve may ...
Living With Your ICD
Living With Your ICD

... What are the risks of having an ICD? Your doctor is the best source of information about the risks of getting an ICD. Be sure to talk about all your questions and concerns. Some possible risks of ICD treatment are discussed below. A small percentage of ICD patients will develop a complication becaus ...
Management of Stable Angina Pectoris, type, stable angina
Management of Stable Angina Pectoris, type, stable angina

... More episodes of silent than painful ischemia in the same patient Difficult to diagnose Holter monitor Exercise testing ...
Echocardiographic Assessment of Cardiac Anatomy
Echocardiographic Assessment of Cardiac Anatomy

... performed with the transducer in the fourth intercostal space near the left sternal edge. If necessary, the transducer was moved laterally and/or to a different interspace so that both mitral leaflets could be visualized with the transducer perpendicular to the chest wall. To obtain consistent and r ...
Bilateral Coronary Artery-Pulmonary Artery Fistulas
Bilateral Coronary Artery-Pulmonary Artery Fistulas

... Coronary artery fistula (CAF) is an abnormal communication between coronary artery and cardiac chamber, great vessel, or other vascular structure (1). In coronary angiography series, CAF rate was found 0.014-0.028% (2-4). Most of the CAF related to one of coronary artery system and communicate to he ...
Melissa Swinnen, Davy Vanhoutte, Geert C. Van Almen, Nazha Hamdani,... W.M. Schellings, Jan D'hooge, Jolanda Van der Velden, Matthew S.... Absence of Thrombospondin-2 Causes Age-Related Dilated Cardiomyopathy
Melissa Swinnen, Davy Vanhoutte, Geert C. Van Almen, Nazha Hamdani,... W.M. Schellings, Jan D'hooge, Jolanda Van der Velden, Matthew S.... Absence of Thrombospondin-2 Causes Age-Related Dilated Cardiomyopathy

... Background—The progressive shift from a young to an aged heart is characterized by alterations in the cardiac matrix. The present study investigated whether the matricellular protein thrombospondin-2 (TSP-2) may affect cardiac dimensions and function with physiological aging of the heart. Methods an ...
Carotid dP/dt as a Psychophysiological Index of Sympathetic
Carotid dP/dt as a Psychophysiological Index of Sympathetic

... ventricular function to be sufficiently significant to justify the inclusion of a PNS-contractility link in that figure. This is not to deny that, in initial, pragmatic terms, it is preferable to focus on ventricular rather than supraventricular functions in the development of any valid index of sym ...
Julia AMoffitt CV short - St. Ambrose University
Julia AMoffitt CV short - St. Ambrose University

... Kadow ZA, Jepson AJ, Firkins RM, Davenport AN, Henry, MK, and Moffitt JA. Moderate intensity exercise training reduces the incidence of supraventricular arrhythmias and increases atrial Connexin40 expression in young and aged rats. DMU Research Symposium, December 2012. Note: Zach Kadow was awarded ...
Preload
Preload

... understanding function  Larger diastolic ventricular volume = More stretch on muscle fibers = greater contraction  Frank-Starling mechanism ...
< 1 ... 49 50 51 52 53 54 55 56 57 ... 762 >

Electrocardiography



Electrocardiography (ECG or EKG*) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on a patient's body. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle depolarizing during each heartbeat.In a conventional 12 lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles (""leads"") and is recorded over a period of time (usually 10 seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle. The graph of voltage versus time produced by this noninvasive medical procedure is referred to as an electrocardiogram (abbreviated ECG or EKG).During each heartbeat, a healthy heart will have an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node down into the bundle of His and into the Purkinje fibers spreading down and to the left throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of cardiac drugs, and the function of implanted pacemakers.
  • studyres.com © 2026
  • DMCA
  • Privacy
  • Terms
  • Report