Continuous vectorcardiography in acute myocardial infarction. Natural course of ST and QRS vectors

Sederholm, Magnus; Erhardt, Leif; Sjögren, A.

doi:10.1016/0167-5273(83)90214-0

Cited by 40 publications

(11 citation statements)

References 23 publications

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“…All patients were monitored with computerised on-line vectorcardiography (MIDA 1000, Ortivus Medical AB, Täby, Sweden) starting at inclusion and for the following 24 h. This method has been described in detail previously [19][20][21][22][23][24][25][26]. It is routinely used in the CCU for monitoring ischaemia, reperfusion and recurrent ischaemia.…”

Section: Vectorcardiographymentioning

confidence: 99%

The influence of acute-phase levels of haemostatic factors on reperfusion and mortality in patients with acute myocardial infarction treated with streptokinase

Nilsson¹,

Boman

Jansson

et al. 2007

J Thromb Thrombolysis

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Section: Vectorcardiographymentioning

confidence: 99%

The influence of acute-phase levels of haemostatic factors on reperfusion and mortality in patients with acute myocardial infarction treated with streptokinase

Nilsson¹,

Boman

Jansson

et al. 2007

J Thromb Thrombolysis

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“…A number of studies have demonstrated the dynamic nature of ischemia during the evolution of myocardial infarction, thrombolysis and coronary angioplasty, and thereby demonstrated the need for continuous monitor ing of myocardial ischemia [1][2][3][4][5][6][7], On-line computerized vectorcardiography (cVCG) has been used for monitoring myocardial ischemia in the coronary care unit (CCU) [1. 2], during coronary angioplasty [3,4], exercise tests [8,9], and to provide prognostic information in patients with unstable angina pectoris or acute myocardial infarction [10.…”

Section: Introductionmentioning

confidence: 99%

On-Line Computerized Vectorcardiography: Influence of Body Position, Heart Rate, Radiographic Contrast Fluid and Myocardial Ischemia

Jensen¹,

Häggmark²,

Johansson

et al. 1997

Cardiology

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On-line computerized vectorcardiography (cVCG) is increasingly being used for continuous monitoring of myocardial ischemia, however, little is known about factors other than ischemia causing electrocardiographic abnormalities. This paper describes how three important cVCG parameters, STC-VM, ST-VM and QRS-VD, are affected by different body positions, myocardial ischemia, contrast injection and increasing heart rate in patients with and without coronary artery disease. The main findings of the study are: contrast injection and different body positions caused major changes in QRS-VD but affected ST-VM and STC-VM to a minor degree. Increasing heart rate by atrial pacing produced substantial changes in all three parameters. Ischemia during angioplasty also produced changes in all three parameters, STC-VM being the most sensitive parameter. In conclusion: (1) STC-VM ( > 50 µV) is the most valuable parameter for monitoring ischemia; (2) we propose ST-VM > 50 µV as criterion instead of previously used 25 µV; (3) QRS-VD cannot be used as a single marker of ischemia, and (4) electrocardiographic changes induced by increased heart rate should be taken into account during interpretation.

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“…Abnormalities in T vector magnitude and orientation were found to be markers of altered ventricular repolarization in post-MI patients [11][12][13]. The present study aims to identify patients after MI using T vector and loop characteristics, especially those without diagnostic conventional ECG findings.…”

Section: Introductionmentioning

confidence: 94%

T Vector and Loop Characteristics Improve Detection of Myocardial Injury After Infarction

et al. 2015

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Electrocardiography (ECG) is widely used to detect myocardial injury. ECG recordings after subendocardial, non-ST-elevation myocardial infarction (MI) may lack striking infarct patterns. A vectorcardiogram (VCG) of the T wave is a three-dimensional characterization of the ventricular repolarization and identifies abnormalities at an advanced level of analysis, which would normally be done manually from conventional ECG. Several parameters describing T vector loop morphology and T vector spatial orientation are examined with regard to their suitability for late MI detection. The discriminatory performance of VCG analysis is compared to that of conventional ECG analysis in identifying post-MI patients. T vector and T loop parameters as well as infarct indicators of the ECG recordings were calculated for 114 subjects: 59 patients (42 males; mean age: 54 years) 15 days after MI (11.9 ± 6.9 d) and 55 healthy controls (27 males; mean age: 49 years). ECG infarct indicators correctly identified 75.2 % of patients, while T vector and loop parameters correctly identified 83.2 % of patients. Discrimination analysis revealed a sensitivity of 66.7 % and a specificity of 77.4 % for conventional ECG, and a sensitivity of 71.7 % and a specificity of 88.7 % for the VCG parameters. T vector and loop characteristics were superior to conventional ECG in separating patients from controls. T vector ECG can improve the detection of myocardial injury and is applicable to the analysis of cardiac repolarization.

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Continuous vectorcardiography in acute myocardial infarction. Natural course of ST and QRS vectors

Cited by 40 publications

References 23 publications

The influence of acute-phase levels of haemostatic factors on reperfusion and mortality in patients with acute myocardial infarction treated with streptokinase

The influence of acute-phase levels of haemostatic factors on reperfusion and mortality in patients with acute myocardial infarction treated with streptokinase

On-Line Computerized Vectorcardiography: Influence of Body Position, Heart Rate, Radiographic Contrast Fluid and Myocardial Ischemia

T Vector and Loop Characteristics Improve Detection of Myocardial Injury After Infarction

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