Key result
A large Q wave in lead 3 was present in 27% of patients with anginal syndrome compared to 3.5% of patients with other types of heart disease.
Why the study?
Is a large Q wave in lead III more frequent in patients with anginal syndrome compared to those with other heart diseases?
Cross-Sectional (n=200)
Is a large Q wave in lead III more frequent in patients with anginal syndrome compared to those with other heart diseases?
A large Q wave in lead III is frequently associated with anginal syndrome, highlighting an early electrocardiographic marker for ischemic heart disease.
Answers are grounded in this paper and cite their sources.
Large Q3 in angina warrants ECG scrutiny; leaves open its diagnostic value in modern cohorts.
The presence of a large Q wave in the third lead is frequently observed in electrocardiographic records from patients with the anginal syndrome. In the majority of these records the QRS group shows left axis deviation, though in a few the electrical axis has a normal direction. The frequency of the large Q-3, both in cardiac patients in general and in those with the anginal syndrome in particular, will appear from the following: In a series of 200 cases of heart disease of various sorts recorded alphabetically in a file of office patients, 30 showed a diagnosis of the anginal syndrome, including both the angina of effort and the angina appearing at rest.¹Of these 30 patients with the anginal syndrome 8, or 27 per cent, were found to have a large Q wave in the third lead. In the other 170 cases 6 such records were found; so that
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Harold E.B. Pardee (1930) conducted a cross-sectional in Heart disease (n=200). Anginal syndrome vs. Other types of heart disease was evaluated on Presence of a large Q wave in the third lead. A large Q wave in lead 3 was present in 27% of patients with anginal syndrome compared to 3.5% of patients with other types of heart disease.
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