The Significance of an Electrocardiogram With a Large Q in Lead 3

Pardee, Harold E. B.

doi:10.1001/archinte.1930.00140150111009

Cited by 89 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our study showed that the effects of age and sex are different among ECG parameters, and that the criteria for ventricular quarter of the R wave (Q/R <0.25), less than 0.2 mV in lead III, and the duration of the Q wave is less than 0.04 s. 23 The median Q wave amplitude was within 0.1 mV and the median Q wave duration was within 0.2 ms, except in lead aVR, in the present study. R-Wave Amplitude R wave amplitude is an important parameter of ventricular hypertrophy, but is probably affected by extracardiac factors (e.g., age, sex, and physique).…”

Section: Discussionmentioning

confidence: 59%

Standard Values and Characteristics of Electrocardiographic Findings in Children and Adolescents

Yoshinaga

Iwamoto²,

Horigome

et al. 2018

Circ J

View full text Add to dashboard Cite

Background:Reference values and the characteristics of the electrocardiographic (ECG) findings using a large number of subjects are lacking for children and adolescents. Methods and Results:A total of 56,753 digitally stored ECGs of participants in a school-based ECG screening system were obtained between 2006 and 2009 in Kagoshima, Japan. Each ECG was manually reviewed by 2 pediatric cardiologists and only ECGs with sinus rhythm were included. A final total of 48,401 ECGs from 16,773 1st (6 years old, 50% girls), 18,126 7th (12 years old, 51% girls), and 13,502 10th graders (15 years old, 52% girls) were selected. ECG variables showed differences in age and sex. However, the effects of age and sex on ECG variables such as the PQ interval, QRS voltage, and STJ segment were also different. The 98th percentile values of well-known surrogate parameters for ventricular hypertrophy in the present study were much higher than the conventional criteria. Conclusions:The present study of a large number of pediatric subjects showed that the effects of age and sex on ECG parameters are different, and that criteria for ventricular hypertrophy should be newly determined by age and sex. We have developed reference data for STJ segment elevation for children and adolescents. These findings are useful for creating guidelines and recommendations for interpretation of pediatric ECG.

show abstract

Section: Discussionmentioning

confidence: 59%

Standard Values and Characteristics of Electrocardiographic Findings in Children and Adolescents

Yoshinaga

Iwamoto²,

Horigome

et al. 2018

Circ J

View full text Add to dashboard Cite

show abstract

“…(2) DEVELOPMENT OF ABNORMAL Q WAVES It has been established that the development of abnormal Q waves, initially reported by Pardee (1930), indicates transmural infarction (Myers et al, 1949). In this study serial changes in the amplitude of the pathological Q waves were used as an index of extension of transmural infarction and compared with the appearance function of CK in each case studied.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of evolution of myocardial infarction by serial determinations of serum creatine kinase activity.

Inoue¹,

Hori²,

Fukui³

et al. 1977

Heart

View full text Add to dashboard Cite

In order to investigate the relation between the release of creatine kinase (CK) in acute myocardial infarction and the evolution of infarction, the appearance functions of CK (release of CK from the heart into the circulation) were calculated by the modified method of Sobel and associates from the serial determinations of serum CK activity in 50 patients with acute myocardial infarction. The relation of the time between the onset of infarction and the peak value of the appearance function to the duration of the evolution of abnormal Q waves in 14 patients with inferior infarction and to the duration ofpain in all patients was investigated.The duration of CK release from the heart averaged 37-2±2-4 hours and correlated wellwith the total CK released (r=0.665) which represents the infarct size. The mean percent of the total CK eventually released by the time of maximum E2Q (sum of the amplitude of Q wave in leads II, III, and aVF) was 80 0+± 6*4 per cent and that of CK released while pain persisted was 72*0±339 per cent. These results strongly suggest that the appearance function of CK reflects the evolution of myocardial infarction.

show abstract

“…The value of ECG changes in leads n, ill, and aVF in estimating the severity of an inferior MI has been questioned (Savage et al, 1977). Pardee was the first to call attention to the large Q wave in lead ill in patients with angina pectoris (Pardee, 1920) and to document the electrocardiographic signs of acute MI (Pardee, 1930). An isolated Q wave in the inferior leads is not always synonymous with an inferior MI (Horan et al, 1971).…”

Section: Discussionmentioning

confidence: 99%

Relationship between electrocardiographically estimated infarct size and clinical findings in inferior myocardial infarction

Herlitz

Hjalmarson

1984

Clinical Cardiology

View full text Add to dashboard Cite

summary: In 270 patients with acute inferior wall myocardial infarction (MI) and no previous MI, Q-and R-wave changes in leads n, ill, and aVF in a 12-lead standard ECO were related to the clinical course during hospitalization and 3-month follow-up. Patients with ECO-defined transmural MI showed a higher incidence of tachycardia, high degree of AV block, congestive heart failure (CHF), and pericarditis than patients with nontransmural MI. In a subgroup including 226 patients, the series was divided into quartiles according to the sum of Q-and R-wave changes in leads n, ill, and aVF 4 days after arrival in hospital. A weak correlation between ECO-determined infarct size and the incidence of complications such as congestive heart failure (CHF) , need for furosemide, and pericarditis, as well as the duration of hospitalization was observed. It is concluded that ECO-determined infarct size from leads n, m, and aVF in inferior MI is associated with the clinical course, although it cannot predict 'the outcome in the individual patient.

show abstract

The Significance of an Electrocardiogram With a Large Q in Lead 3

Cited by 89 publications

References 2 publications

Standard Values and Characteristics of Electrocardiographic Findings in Children and Adolescents

Standard Values and Characteristics of Electrocardiographic Findings in Children and Adolescents

Evaluation of evolution of myocardial infarction by serial determinations of serum creatine kinase activity.

Relationship between electrocardiographically estimated infarct size and clinical findings in inferior myocardial infarction

Contact Info

Product

Resources

About