EKG Chapter 9
Terms
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- Infarction in ventricles can often be fatal. Why?
- Nearby Hypoxic Ventricular foci can produce serious ventricular arrrhythmias.
- Ischemia is characterized on an EKG by an inverted and symmetrical (blank).
- T wave
- Acute myocardial injury is denoted on an EKG by ST segment (blank)
- elevation
- Persistent ST segment elevation in the precordial leads is related to what condition?
- Ventricular Aneurysm
- ST segment elevation along with (blank) can denote severity of the infarction.
- Q waves (no Qs usually less severe)
- Describe the Effect of Pericarditis on the ST segment.
- Elevation of ST that is flat or slightly concave.
- Flat ST depression can be seen in (blank location) infarction
- subendocardial
- Significant Q waves (0.04s, 1mm, or 1/3 QRS) indicate (blank).
- necrosis
- Describe where best to appreciate Q waves in Anterior, Lateral & Inferior Infarcts.
-
Anterior - V1-V4;
Lateral - I, AVL;
Inferior - II, III, AVF - What would you see in V1-V2 with Acute Anterior Infarction?
- ST elevation with Significant Q waves
- What would you see in V1-V2 with Acute Posterior Infarction?
- Large R wave with ST depression (note that this is the opposite of Acute Anterior).
- Why does LBBB complicate infarction diagnosis on EKG?
- Delay causes Q waves from the Left to fall within the middle of the QRS complex and may not be detected.
- Describe the coronary vessels responsible in Anterior, Lateral,Inferior & Posterior Infarcts.
-
Anterior - LAD;
Lateral - Circumflex from L;
Posterior - RCA;
Inferior - can be either R/LCA - Describe the vascularization of the AV node and its R & L Bundles (Anterior & posterior branches)
- AV = RCA; R Bundle = LAD; L Bundle Anterior = LAD; L Bundle Posterior = LAD +- RCA;
- What is the Anterior Hemiblock's vessel that is occluded? EKG findings?
- Left Anterior Descending; L axis deviation with normal/slightly wider QRS, Q1S3
- RBBB with Left Axis Deviation is probably caused by (blank)
- Anterior Hemiblock.
- What is the EKG Findings in Posterior hemiblock?
- RAD, normal/slightly wider QRS, S1Q3
- intermittent changes in QRS pattern are characteristic of ?
- Intermittent BBB
- intermittent changes of QRS axis are characteristic of?
- intemrittent hemiblock