Practice Makes Perfect ExercisesChapter 20

ECG # / Rate / Regularity / P waves / QRS complexes / PR Intervals / ST segments / T waves / QT intervals / U waves / Rhythm/Dysrhythmia
1. / 43 / Regular / Absent / Normal, 0.08 / Absent / Elevated in leads II, III, aVF, V3 through V6, reciprocal changes in lead I and aVL / Elevated in leads II, III, aVF / Lengthened, 0.56 / None / Junctional escape rhythm, acute inferior wall injury or MI, anterolateral injury pattern, some artifact
2. / 42 / Regular / Normal / Normal, 0.08 / 0.16 / Elevated in leads II, III, and aVF / Elevated in lead II / Normal, 0.44 / None / Sinus bradycardia, acute inferior wall injury or MI
3. / 136 / Totally irregular / Indiscernible, totally chaotic baseline / Normal, 0.10 / Absent / Downsloping in leads I, aVL and V3 through V6 / Inverted in leads I, aVL and V3 through V6 / Normal, 0.40 / None / Atrial fibrillation, Septal
infarct (age undetermined),
ST & T wave abnormality—
lateral wall ischemia
4. / 71 / Irregular / Normal in the underlying rhythm, absent preceding the PVCs / Pathological Q waves in leads V1 through V3, normal in the remaining underlying rhythm, wide and bizarre-looing in the PVCs / 0.16 / Elevated in leads V1 through V3 / Inverted in lead III, elevated in leads V2 and V3 / Normal, 0.44 / None / Sinus rhythm with PVCs, acute anteroseptal MI
5. / 94 / Regular / Normal / Negative deflection in lead aVF otherwise normal, 0.08 / 0.16 / Depressed and flat in leads I, aVL and V3 through V6 / Flat in lead I, biphasic in leads V4 to V6 / Normal, 0.40 / None / Sinus rhythm, left axis deviation, marked ST abnormality, possible
lateral wall subendocardial injury
6. / 47 / Regular / Normal / Pathological Q waves in leads III and aVF, QS complexes in leads V1 and V2, 0.08 / Lengthened, 0.24 / Elevated in leads II, III, and aVF, depressed in leads I, aVL, V2, / Elevated in lead II, III and aVF, reciprocal changes in leads I and aVL / Normal, 0.44 / None / Sinus bradycardia with 1st-degree AV block, acute inferior wall injury/MI
7. / 120 / Totally regular / Indiscernible, totally chaotic baseline / Low voltage in the limb leads, 0.08, slightly more negative than positive in lead aVF, QS complexes in lead V2 / Absent / Depressed and flat in leads I, II, aVF and V3 through V6, elevated in lead V1 / Flat in lead I, biphasic in leads II, III, aVF andV3 to V6 / Normal, 0.40 / None / Atrial fibrillation with rapid ventricular response, left axis deviation, low voltage QRS complexes, cannot rule out anterior infarct (age undetermined), inferior infarct (age undetermined), marked ST abnormality, possible lateral subendocardial injury
8. / 54 / Regular / Normal were seen (cannot be seen in leads with artifact) / Wide, slurred S waves in leads II, III, aVF, V3 through V6, rsR’ complex in lead V1 / 0.12 / Elevated in leads I, aVL, V1 and V2 / Inverted in leads aVL, V1 and V2 / Normal, 0.44 / None / Sinus bradycardia with anterior lateral wall MI and right bundle branch block
9. / 54 / Regular / Normal were seen (cannot be seen in leads with artifact) / Normal, 0.08 / 0.20 / Elevated in leads II, III, aVF, V5 and V6 / Elevated in leads II, III, and aVF / Normal, 0.44 / None / Sinus bradycardia, acute inferior and lateral wall injury/MI
10. / 48 / Regular / Normal were seen (cannot be seen in leads with artifact) / Normal, 0.10 / 0.32 / Elevated in leads II, III, and aVF, depressed in leads I and V3 through V5 / Elevated in leads II, III, and aVF, reciprocal changes in leads aVL, V1 and V2 / Normal, 0.44 / None / Sinus bradycardia with 1st degree AV block, acute inferior wall injury/MI, lateral wall injury pattern and the reciprocal changes in leads V1 and V2 are suggestive of posterior wall AMI