Answer 30

30.   Choice A is the correct answer.  With right ventricular hypertrophy, there is a large R wave in lead V1.  There is a more positive deflection toward the V1 electrode and expect the QRS complex more upright than normal.  The S wave in lead V1 is smaller than the R wave.  With left ventricular hypertrophy, the left ventricle causes QRS complexes to be bigger in both height and depth in leads V1-V6.  There is a larger R wave in lead V5 because it is right over the left ventricle.  There is often inversion of the T wave. With atrial hypertrophy there is a biphasic P wave in lead V1.  If the initial component is the largest there is right atrial hypertrophy.  If the terminal portion of the P wave in lead V1 is the largest, it is left atrial hypertrophy.  

Question 30

30.  Please identify the abnormality on the EKG listed below:

A.  Right Ventricular Hypertrophy
B.  Left Ventricular Hypertrophy
C.  Left Atrial Hypertrophy
D.  Right Atrial Hypertrophy

Answer 29

29.  Choice D is the correct answer.  Hypocalcemia causes prolonged QT interval.  This is best assessed in leads V5 and V6.  Hypercalcemia causes shortened QT interval.  Hypokalemia causes flattened T waves and U waves.  Hyperkalemia causes peaked T waves.

Question 29

29.  Please identify the abnormality on the EKG listed below:

A.  Hyperkalemia
B.  Hypokalemia
C.  Hypercalcemia
D.  Hypocalcemia

Answer 28

28.  Choice B is the correct answer.  Left bundle branch block is demonstrated by the R and R' waves in leads V5 and V6.  If it is only present in one lead it is referred to as a incomplete left bundle branch block.  Hypokalemia is when the T wave is flattened and there may be a U wave present.  This is not ventricular tachycardia.

Question 28

28.  Please identify the abnormality on the EKG below:

A.  Incomplete Left Bundle Branch Block

B.  Left Bundle Branch Block

C.  Ventricular Tachycardia

D.  Hypokalemia

Answer 27

27.  Choice B is the correct answer.  It is a narrow complex tachycardia.  It is a rapid sudden onset of a heart rate originating from an ectopic foci form the AV junction.  The P wave is inverted and occurring before during or after the QRS complex.  Rate is between 150-250 beats per minute.  PAT is when the ectopic focus occurs from the atria.  Often it is hard to tell if the the P wave is present or not.  Collectively these tachycardias are referred to as supraventricular tachycardia.  Ventricular tachycardia is a wide complex tachycardia that has a rate over 150 beats per minute.  Atrial Fibrillation is an irregularly irregular rhythm that the ectopic focus occurs from the atria.