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.