What does a small Q wave mean?
A small Q wave was defined as any negative deflection preceding the R wave in V(2) or V(3) with <40-ms duration and <0.5-mV amplitude, with or without a small (<0.1-mV) slurred, spiky fragmented initial QRS deflection before the Q wave (early fragmentation).
What do abnormal Q waves indicate?
Q waves that are pathologically deep but not wide are often indicators of ventricular hypertrophy. Q waves that are both abnormally deep and wide imply myocardial infarction.
What are small inferior Q waves?
Small Q waves can physiologically occur depending on the heart axis, that is in leads I and aVL with a left axis or in leads II, III, and aVF with an inferior or right axis. A pathological Q wave can be the result of a local deviation of electrical excitation due to myocardial scar.
What does an abnormal Q wave on ECG mean?
Conclusion: Abnormal Q waves on the admission electrocardiogram (ECG) are associated with higher peak creatine kinase, higher prevalence of heart failure, and increased mortality in patients with anterior MI. Abnormal Q waves on the admission ECG of patients with inferior MI are not associated with adverse prognosis.
Which characteristic on the ECG typically indicates myocardial ischemia?
Myocardial ischemic-like ECG changes include ST-segment deviations, T wave inversion, and Q-waves. The earliest manifestations of myocardial ischemia typically involve T waves and the ST segment. It is believed that ECG changes in CCS most often represent preexisting ischemic cardiac disease.
Are small Q waves normal?
Normal Electrocardiogram Small Q waves are present in the left precordial leads in more than 75 percent of normal subjects. They are seen most frequently in lead V6, less frequently in leads V5 and V4, and rarely in V3.
How do I know if I have myocardial ischemia?
- Electrocardiogram (ECG). Electrodes attached to your skin record the electrical activity of your heart.
- Stress test.
- Stress echocardiogram.
- Nuclear stress test.
- Coronary angiography.
- Cardiac CT scan.