Answer and Explanation 5

5.  C is the correct answer.  Torsades de pointes is a variant of ventricular tachycardia that occurs during a magnesium deficiency.

Question 5

5.  Which electrolyte is this patient likely lacking in the EKG strip below:

A.  Chloride

B.  Potassium

C.  Magnesium

D.  Sodium

Answer and Explanation 4

4.  The correct answer is B ventricular tachycardia.  The QRS complex is too wide to be A-Fib, A Flutter, or SVT.  However, usually we consider rates greater than 150 to be SVT.

Question 4

4.  Please interpret the EKG below:

A.  Supraventricular Tachycardia

B.  Ventricular Tachycardia

C.  Atrial Fib with RVR

D.  Atrial Flutter with RVR

Answer and Explanation 3

3.  The correct answer is B Right Bundle Branch Block.  In a RBBB the QRS duration is greater than .12 seconds in limb leads.  It also has to have a RSR pattern in V1 with a depressed ST segment and inverted T waves. There is also a deep S wave in V5-V6.  There is a normal PR interval.  There is a intrinsicoid  deflection delayed to 0.07 seconds in V1.

Question 3

3.  Please interpret the EKG below:

A.  Left Bundle Branch Block

B.  Right Bundle Branch Block

C.  Lateral ST segment depression

D.  Lateral ST segment elevation

Answer and Explanation 2

2.  C is the correct answer.  Normal PR interval is between 120 and 200 milliseconds.  First degree AV Block is when the area in the conduction cycle is slowed to greater than 200 milliseconds (five small boxes).  Junctional rhythm is when the p waves are inverted or absent (because they are within the QRS complex).  With Wandering Atrial Pacemaker the P wave change size, position, and direction during the EKG strip.  Third degree AV block is complete atrial and ventricular disassociation.

Question 2

1.  Please interpret the EKG below:

A.  Third Degree Block

B.  Junctional Rhythm

C.  First Degree AV Block

D.  Wandering Atrial Pacemaker

Answer and Explanation 1

1. A left axis deviation is the correct answer.  When trying determine the appropriate axis you need to look at the positive or negative deflection of the QRS of Leads AVF and I.  Normal axis =positive deflection in lead I, and positive deflection lead AVF.  Left Axis Deviation=Negative deflection of AVF and Positive deflection of lead I.  Right Axis Deviation=negative deflection of lead I and positive deflection of lead AVF.  Extreme Right Axis Deviation=negative deflections of both lead I and lead AVF.

Question 1

1. Which of the following is the best interpretation of the EKG listed below?

A.  Left Axis Deviation

B.  Right Axis Deviation

C.  Normal Axis

D.  Extreme Right Axis Deviation