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From American Heart Association
www.circ.ahajournals.org/cgi/content/full/98/18/1937
The J point in the ECG is the point where the QRS complex joins the ST segment. It represents the approximate end of depolarization and the beginning of repolarization as determined by the surface ECG. There is an overlap of 10 milliseconds. The J point may deviate from the baseline in early repolarization, epicardial or endocardial ischemia or injury, pericarditis, right or left bundle-branch block, right or left ventricular hypertrophy, or digitalis effect. The term J deflection has been used to designate the formation of the wave produced when there is a large, prominent deviation of the J point from the baseline. The J deflection has been called many names, including camel-hump sign, late delta wave, J-point wave, and Osborn wave.
The prominent J deflection attributed to hypothermia was first reported in 1938 by Tomaszewski. The wave was observed by others, including Kossmann,Grosse-Brockhoff and Schoedel, Bigelow et al, Juvenelle et al, and Osborn.
Over the years, the unusual wave increasingly has been called an Osborn wave (Figure 4B ), probably because of Osborn's excellent article written in 1953. Clinicians labeled the deflection an Osborn wave in honor of Osborn, one of the first American Heart Association research fellows.
Much has been written about the abnormal J deflection observed in patients with hypercalcemia. Other conditions have been reported to cause an abnormal J deflection, including brain injury, subarachnoid hemorrhage, damage to sympathetic nerves in the neck, and cardiopulmonary arrest from oversedation. Brugada and Brugada reported patients with right bundle-branch block who exhibited noncoronary ST-segment elevation in the right precordial leads and experienced ventricular tachycardia or ventricular fibrillation. A controversy now surrounds this condition because not all of the tracings show classic right bundle-branch block, and some patients might have arrhythmogenic right ventricular dysplasia.
All J-wave deflections do not look alike. Some are merely elevations of ST segments in leads V1 and V2, whereas others are of the spike-and-dome variety. This leads to the conclusion that different mechanisms may be responsible for the size and shape of J-wave deflections.
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ECG stands for what?
Electrocardiogram.
Who is the invent the ecg?
It was invented by William Einthoven in the early 1903.
Voltage changes in an ECG are related to the?
resistance
What components of the ECG are normally measured along the isoelectric line?
st segments
What is the use of instrumentation amplifier in ecg circuit?
for better amplification ...by instrumentation amplification we get the output admittance will be more
What is high take off ecg?
it is an elevation of j point, which is the junction between QRS and ST. This elevation makes the ECG looks like ST elevation and might be misinterpreted as AMI. For the proper management of chest pain, please refer to the local guideline.
Point after which pressure begins to rise in the aorta on an ECG tracing?
At the end of the QRS complex. At the lowest point of the complex.
What is the full form of ecg scan?
ECG stands for ElectroCardioGram
When does a person suffers from ECG?
Never. An ECG is a test, not an illness or disease.
What are the effects of adrenaline on ECG?
adrenaline speeds the heart and the ecg will reflect that.
What does an unconfirmed diagnosis ECG means?
what does a unconfirmed diagnosis on an ecg means
An ECG provides imformation about what?
An ECG provides information about the wearer of the ECG's heartrate and rhythm of the heart. It provides information about wether it is normal or abnormal.
What has the author Henry J L Marriott written?
Henry J. L. Marriott has written: 'Advanced ECG Review Booklet' 'Marriott's manual of electrocardiography' -- subject(s): Electrocardiography, Handbooks, manuals 'ECG/PDQ' -- subject(s): Electrocardiography 'Practical electrocardiography' -- subject(s): Electrocardiography 'Rhythm quizlets' -- subject(s): Electrocardiography, Problems, exercises, Arrhythmia, Case studies, Diagnosis, Problems 'Electrocardiography' 'Prac Electrocardiography' 'Emergency electrocardiography' -- subject(s): Electrocardiography, Heart, Diseases, Diagnosis, Examination questions 'ECG Ready Reference'
What changes can occur on ECG due to coronary artery disease?
The ECG shows ST elevation or depression and pathological Q waves. The pathological Q wave is a sign of an old infarct (heart attack) as the muscle doesn't conduct an impulse at a certain point.
What does the medical abbreviation NSST mean?
NSST on an ECG stands for non-specific ST, and is usually followed by the word "changes." Non-specific ST changes are alterations in the shape, height, or slope of the ST segment in the ECG that don't point to a particular diagnosis.
How do you if the ECG machine is working correctly?
It can be tested with something called an ecg simulator.
Also known as an ECG or EKG?
Electrocardiogram is also known as ECG or EKG
