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[Clinical electrocardiographic diagnosis of the preinfarct state]
Insights
This study found that electrocardiogram (ECG) changes in patients with angina pectoris correlate with disease severity. More severe ischemic changes and left atrial bio-electric potential deficiencies indicate a higher risk of myocardial infarction.
Area of Science:
- Cardiology
- Clinical Electrophysiology
Context:
- Management of angina pectoris requires accurate risk stratification.
- Electrocardiography (ECG) is a key diagnostic tool in cardiology.
Purpose:
- To analyze ECG parameters in patients experiencing angina pectoris.
- To correlate ECG findings with the severity of ischemic heart disease and preinfarction states.
Summary:
- 164 patients with angina pectoris were evaluated using clinical examination and 12-lead ECG.
- ECG analysis focused on atrial and ventricular complex values, categorizing patients into stable angina, subacute, and acute preinfarction states.
- Increased severity of left ventricular myocardial ischemia and left atrial bio-electric potential deficiency correlated with disease progression from stable to acute preinfarction states.
Impact:
- Findings suggest ECG changes can predict myocardial infarction risk.
- In preinfarction patients, 53.9% developed myocardial infarction, with necrosis localization matching preinfarction ischemic zones in 89.9%.
Abstract:
The management of 164 patients with a paroxysm of angina pectoris by a cardiologic emergency aid unit included, besides a clinical examination, the recording of the ECG in 12 commonly accepted and additional leads suggested by Neb, N.F. Gurevich, and Slapac--Partilla. The values of the atrial and the end portion of the ventricular complexes of the ECG were analysed. Three groups of patients were distinguished; group 1 with uncomplicated (stable) angina pectoris; group 2 with subacute and group 3 with acute preinfarction state. It was established that the severity of ischemic changes in the left ventricular myocardium and the pronounced character of changes in values charaterizing definite deficiency of left atrial bio-electric potentials correlate and grow successively from group 1 to group 3. Among the patients hospitalized with a state of preinfarction 53.9% developed myocardial infarction; in 89.9% of patients the localization of the necrosis coincided with the ischemic zones in the preinfarction state.