Normalization of Abnormal T Waves in Ischemia

Noble, R. Joe

doi:10.1001/archinte.1976.03630040003002

Cited by 48 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…segment lowering, and T-wave inversion. Recordings of reciprocal changes, such as MI, are possible [ 33 ].…”

Section: Reviewmentioning

confidence: 99%

Importance of ECG in the Diagnosis of Acute Pericarditis and Myocardial Infarction: A Review Article

Sarda¹,

Thute²

2022

Cureus

View full text Add to dashboard Cite

A promising scientific field is health monitoring and associated technology. A standard testing method to evaluate and identify heart issues is the electrocardiogram (E.C.G.) and diagnose cardiovascular diseases (CVDs). E.C.G. monitoring technologies are becoming more and more prevalent in publications at an exponential rate. E.C.G. is the most crucial tool for screening cardiology and other medical specialities. Twelve leads can be recorded by traditional E.C.G. equipment, while current E.C.G. systems allow for extra leads also with fewer electrodes. Furthermore, "smart" gadgets allow patients to take an E.C.G. at residence. Presenting different ischemia-related symptoms on the E.C.G. by the most recent recommendations. Presentation of contemporary E.C.G. systems and their possible benefit in identifying ischemia-related E.C.G. symptoms based on recent study findings. The identification of ischemia E.C.G. abnormalities can be facilitated and optimised by current E.C.G. systems using vector-based electrocardiography. Although they can be effective for documenting transient E.C.G. abnormalities, especially inside the S.T. segment, smart non-vector-based devices for patients are primarily beneficial for the diagnosis of arrhythmias and cannot substitute the 12-lead E.C.G. for the diagnosis of ischemia. The electrocardiogram (E.C.G.) is inexpensive and easily accessible, but because of its alleged limited specificity, its utility as a screening tool for early detection of athletes with a cardiac condition in danger of immediate cardiac death is contentious. The interpreting parameters have been continuously evolving over the past 10 years as various efforts have been made to better the separation between healthy and pathological E.C.G. abnormalities in athletes. Electrocardiographic abnormalities that are unrelated to cardiac electrical activity are known as electrocardiographic artefacts. E.C.G. elements, including the baseline and waves, can become altered as a result of artefacts.

show abstract

“…segment lowering, and T-wave inversion. Recordings of reciprocal changes, such as MI, are possible [ 33 ].…”

Section: Reviewmentioning

confidence: 99%

Importance of ECG in the Diagnosis of Acute Pericarditis and Myocardial Infarction: A Review Article

Sarda¹,

Thute²

2022

Cureus

View full text Add to dashboard Cite

show abstract

“…Инвертированные Т не являются маркером клеточной гибели, а возникают в результате нарушений работы ионных каналов, вызываемых последствиями тяжелой ишемии. Эпизоды рецидивов ишемии у таких пациентов связаны с «псевдонормализацией» зубцов Т, в некоторых случаях сопровождающихся элевацией сегмента ST в соответствующих отведениях [17,18]. Синдром Велленса предполагает наличие критического стеноза или обструкции проксимального отдела передней нисходящей артерии (ПНА) с чувствительностью 69 % и специфичностью 89 % [19].…”

Section: синдром велленсаunclassified

Electrocardiographic Signs of Acute Myocardial Ischemia as Equivalents of St Elevation Myocardial Infarction

Ишевская

Намитоков²,

Космачева

2020

jour

View full text Add to dashboard Cite

Ранняя реперфузия остается ключевым этапом ведения пациентов с острым коронарным синдромом с подъемом сегмента ST (ОКСпST), так как элевация на электрокардиограмме (ЭКГ) признана проявлением критического стеноза или окклюзии коронарной артерии. В то же время около 10-25 % пациентов с острым коронарным синдромом без подъема сегмента ST, по данным коронароангиографии (КАГ), также имеют критический стеноз или окклюзию крупной эпикардиальной артерии. Задержка реваскуляризации в таком случае закономерно приводит к ухудшению исходов. Хотя в текущих рекомендациях кратко упомянуты критерии эквивалентов ОКСпST, сведения по специфическим паттернам ЭКГ все еще недостаточны. Проведен поиск по базам данных MEDLINE и EMBASE, выполнен систематический обзор литературы по паттернам острого коронарного синдрома без подъема ST (ОКСбпST), ассоциированным с критическим стенозом или окклюзией, также приведены сведения по чувствительности и специфичности. Трудно переоценить практическую ценность выявления пациентов высокого риска в отсутствии подъема ST на ЭКГ на этапе скорой помощи или приемного покоя. Ключевые слова: эквивалент ОКС с подъемом сегмента ST, острый коронарный синдром, первичное чрескожное коронарное вмешательство, обзор.

show abstract

“…32,33 Key Point: This normalization of ST-segment depression can be due to ischemic ST-segment elevation when accompanied by ischemic chest pain, an abnormal perfusion scan, or abnormal exercise echocardiography. 32,33 Key Point: This normalization of ST-segment depression can be due to ischemic ST-segment elevation when accompanied by ischemic chest pain, an abnormal perfusion scan, or abnormal exercise echocardiography.…”

Section: Manual Of Exercise Testingmentioning

confidence: 99%

“…32,33 Key Point: This normalization of ST-segment depression can be due to ischemic ST-segment elevation when accompanied by ischemic chest pain, an abnormal perfusion scan, or abnormal exercise echocardiography.Key Point: LBBB and WPW negate ST analysis for ischemia, and right bundle branch block allows for ST analysis for ischemia in all but the anterior leads, where the T-wave inversion due to aberrant conduction. The direction and magnitudes of time-normalized P, QRS, and ST vectors and other QRS parameters were analyzed during and after exercise in 56 apparently healthy men, ages 23 to 62 years.…”

mentioning

confidence: 99%

Interpretation of the Electrocardiogram

Froelicher

2007

Manual of Exercise Testing

View full text Add to dashboard Cite

MANUAL OF EXERCISE TESTING1975-Simoons and Hugenholtz 5 reported Frank lead vectorcardiographic changes during exercise in normal subjects. The direction and magnitudes of time-normalized P, QRS, and ST vectors and other QRS parameters were analyzed during and after exercise in 56 apparently healthy men, ages 23 to 62 years. The PR interval and the P-wave amplitude increased during exercise. Direction of the P vectors did not change, differing with previous reports that had noted changes consistent with right atrial overload. No significant change in QRS magnitude was observed, and the magnitude in spatial orientation and the maximum QRS vectors remained constant. QRS onset to T-wave peak shortened. The terminal QRS vectors and the initial ST vectors gradually shortened and shifted to the right and upward. The T-wave amplitude lessened during exercise. In the first minute of recovery, the P and T magnitudes markedly increased, and then all measurements gradually returned to the resting level. There was an increase in S-wave duration in leads X and Y, and right-axis shift in the QRS complex was heart rate dependent. The ST-segment shifted upward to the right and posterior, and T-wave magnitude increased markedly in the first minute of recovery. The QRS complex shortened in some young individuals during exercise. 1979-The United States Air Force Medical Corps (USAFMC) NormalAircrewmen Study was based on digital data from 40 low-risk normal subjects, processed, and analyzed across treadmill times on the basis of waveform component and lead. 6 USAFMC Normal Aircrewmen StudyFigure 4-1 illustrates the waveforms produced using median values of the measurements of all 40 subjects for leads V5, aVF (Y), and V2 (Z). These figures demonstrate the specific waveform alterations that occur in response to maximal treadmill exercise. Supine, exercise to a heart rate of 120 beats per minute, maximal exercise, 1-minute recovery, and 5-minute recovery were chosen as representative times. There is depression of the J junction and peaking of the T waves at maximal exercise and at 1-minute recovery. Along with the J-junction depression (QRS end or ST0), marked ST upsloping is seen. J-junction depression did not occur in the Z lead (which is equivalent to and of the same polarity as V2). As the R wave decreases in amplitude, the S wave increases in depth. The QS duration shortens minimally, but the RT duration decreases in a larger amount. Q-Wave, R-Wave, and S-Wave AmplitudesIn leads CM5, V5, CC5, and Y, the Q wave shows very small changes from the resting values; however, it does become slightly more negative at maximal exercise. Q-wave changes were not noted in the Z lead. Changes in Key Point: Junctional ST depression below the PR isoelectric line is normally seen with increasing heart rate, and early repolarization normally decreases to or below the isoelectric line.median R-wave amplitude are not detected until near-maximal and maximal effort is approached. At maximal exercise and on into 1-minute recovery, a sharp decrease in R-...

show abstract

Normalization of Abnormal T Waves in Ischemia

Cited by 48 publications

References 7 publications

Importance of ECG in the Diagnosis of Acute Pericarditis and Myocardial Infarction: A Review Article

Importance of ECG in the Diagnosis of Acute Pericarditis and Myocardial Infarction: A Review Article

Electrocardiographic Signs of Acute Myocardial Ischemia as Equivalents of St Elevation Myocardial Infarction

Interpretation of the Electrocardiogram

Contact Info

Product

Resources

About