Thallium Correct Ans-a chemical used in nuclear imaging (others include technetium
sestamibi, technetium tetrofosmin)
Reasons for false positive stress test results: Correct Ans-Females > Males
Disease states
Use of certain drugs
Disease states that can cause false positive stress test results: Correct Ans--LVH
-Cardiomyopathy
-Hyperventilation
-LBBB
-Electrolyte abnormalities
Drugs that may cause false positive stress test results: Correct Ans--Cardiac glycosides
(digitalis derivatives)
-Tricyclic antidepressants
Normal length of P wave Correct Ans-0.08-0.1 seconds in duration (2-2.5 small blocks)
Activation of the AV node is represented by: Correct Ans-the middle of the P wave
, CCT Exam – MISC Questions and Answers 100% Pass
Normal QRS duration: Correct Ans-0.06-0.10 seconds in duration
J-point Correct Ans-the junction of the QRS complex and the ST segment
ST segment represents: Correct Ans-approximately corresponds to the plateau phase of
the action potential (ventricle is completely depolarized)
Normal duration of PR interval Correct Ans-0.12-0.20 seconds
Accelerated conduction Correct Ans-PR interval is shorter than 0.12 seconds
Atrial hypertrophy is caused by... Correct Ans--Increase in blood volume (dilation of atria)
-Increase in resistance to blood flow in atria (thickening of walls)
ST segment and T wave represent: Correct Ans-repolarization of the ventricle
U-wave represents: Correct Ans-final phase of Purkinje repolarization
Leakage current Correct Ans-the electrical current that flows through the ground
conductor (if a ground conductor is not present, leakage current could flow to any conductive
surface)
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