What does ST elevation in lateral leads mean?
ST-segment elevation usually indicates a total blockage of the involved coronary artery and that the heart muscle is currently dying. Non-STEMI heart attacks usually involve an artery with partial blockage, which usually does not cause as much heart muscle damage.
What does ST depression in lateral leads mean?
The ST segment depression in the lateral leads (I, aVl, V5, and V6) is seen in approximately 70% of patients with electrocardiographic LVH; such a finding has been termed the “strain pattern.” While this finding may represent altered repolarisation attributable to the presence of LVH, it may also be a manifestation of …
What can cause ST changes?
Differential Diagnosis Other pathologies that can cause ST-segment elevations include: myocarditis, pericarditis, stress cardiomyopathy (Takotsubo), benign early repolarization, Acute vasospasm, spontaneous coronary artery dissection, left bundle branch block, various channelopathies, and electrolyte abnormalities.
What does a ST elevation indicate?
ST elevation refers to a finding on an electrocardiogram wherein the trace in the ST segment is abnormally high above the baseline.
What does ST mean in cardiology?
The ST segment is an interval between ventricular depolarization and ventricular repolarization. It is identified as the end of the QRS complex to the beginning of the T wave. The end of the T wave to the beginning of the P wave is described as the TP segment, which is the zero potential or isoelectric point.
How serious is ST depression?
Asymptomatic ST-depression was associated with a 3.2-fold risk of sudden cardiac death.
Can stress cause ST elevation?
They concluded that ST segment elevation is a good indicator of severe ischemia and poor collateral circulation. Several other case reports also found rare cases of ST elevations in non-Q wave leads during exercise stress testing that accurately predicted the presence of coronary stenoses (9–11).
What conditions cause ST elevation?
To summarize, non-ischemic causes of ST-segment elevation include left ventricular hypertrophy, pericarditis, ventricular-paced rhythms, hypothermia, hyperkalemia and other electrolyte imbalances, and left ventricular aneurysm.
What causes ST elevation on an ECG?
ST segment elevation occurs because when the ventricle is at rest and therefore repolarized, the depolarized ischemic region generates electrical currents that are traveling away from the recording electrode; therefore, the baseline voltage prior to the QRS complex is depressed (red line before R wave).
Can stress cause ST depression on ECG?
Objective: The electrocardiogram (ECG) obtained during stress testing often shows a typical pattern of primary ST depression. A similar pattern can occur in unstable angina. Current textbooks consider ST depression as a direct result of partial occlusion of a coronary artery.
Can stress cause ST segment depression?
Interpretation of the treadmill ECG stress test In general, the occurrence of horizontal or down-sloping ST-segment depression at a lower workload (calculated in METs) or heart rate indicates a worse prognosis and higher likelihood of multi-vessel disease.
What is the ST elevation in the high lateral leads?
There is also subtle ST elevation in the high lateral leads (I and aVL); this may be easily missed. However, the presence of reciprocal ST depression in the inferior leads (III and aVF) makes the lateral ST elevation more obvious.
Is there reciprocal ST depression in the high lateral leads?
There is usually reciprocal ST depression in the electrically opposite leads. For example, STE in the high lateral leads I + aVL typically produces reciprocal ST depression in lead III (see example below).
What is reciprocal change in the inferior leads?
Reciprocal change in the inferior leads is only seen when there is ST elevation in leads I and aVL. This reciprocal change may be obliterated when there is concomitant inferior ST elevation (i.e an inferolateral STEMI) Anterolateral STEMI due to LAD occlusion. Inferior-posterior-lateral STEMI due to LCx occlusion.
What causes ST elevation in lateral infarction?
Isolated lateral infarction due to occlusion of smaller branch arteries such as the D1, OM or ramus intermedius. ST elevation is present in the high lateral leads (I and aVL). There is also subtle ST elevation with hyperacute T waves in V5-6.