Ekg Change Ischemia Lateral Clinical Trial
Official title:
DIAGNOSTIC VALUE OF ELECTROCARDIOGRAPHIC ST-T WAVE CHANGES IN LEAD aVL IN PATIENTS WITH CHRONIC STABLE ANGINA
The electrocardiogram (ECG) is a simple and non-invasive bedside diagnostic tool with a well-established role in the diagnosis of (CAD). Many studies have found that the admission of ECG provides important prognostic information in patients admitted with chest pain. For instance, T wave inversion in anterior or inferior location and or ST-segment depression has been associated with high incidence of CAD.
The aim of the work will be directed to study the diagnostic value of electrocardiographic
ST-T wave changes in lead aVL in patients with chronic stable angina
The ECG findings vary considerably, depending importantly on four major factors: (1) the
duration of the ischemic process (acute versus evolving or chronic) ; (2) its extent (large
versus small) ; (3) its topography (anterior versus inferior-posterior and right
ventricular) ; (4) the presence of other underlying conditions (e.g. LBBB, WPW or pacemaker
pattern) that can mask or alters the classic pattern.
The resting electrocardiogram is normal in approximately half of patients with chronic
stable angina pectoris, and even patients with severe CAD may have a normal tracing at rest.
A normal resting ECG suggesting a normal LV function and it is unusual finding in a patient
with an extensive previous infarction.
The most common electrocardiographic abnormalities in patients with chronic CAD are non
specific ST-Twave changes with or without abnormal Q waves. In addition to myocardial
ischemia, other conditions that can produce ST-T wave abnormalities include LV hypertrophy
or dilation, electrolyte abnormalities, neurogenic effects, and anti-arrhythmic drugs.
In patients with known CAD, however, the occurrence of ST-T wave abnormalities on the
resting ECG may correlate with the severity of the underlying heart disease. This
association may explain the adverse association of ST-Twave changes with prognosis of these
patients. In contrast, a normal resting ECG is more favorable long-term prognostic sign in
patients with suspected or definite CAD.
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Observational Model: Case-Crossover, Time Perspective: Prospective