Exam (elaborations)
CCT Exam Practice - Interpreting a 12-Lead ECG & MI's
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CCT Exam Practice - Interpreting a 12-Lead ECG & MI's
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CCT Exam Practice - Interpreting a 12-Lead ECG & MI'sbundle branch block Correct Ans-impulse is delayed or blocked within the bundle branches
of the normal conduction pathway
- results in widened QRS >=0.12 secs (about 3 blocks or more) with characteristic QRS shape
RBBB characteristics Correct Ans-QRS >=0.12 secs
RSR' configuration in V1 (or V2-3)
widened, deep S waves in lateral leads (leads I, AVL, V5-6)
T wave slopes opposite terminal wave of QRS
LBBB characteristics Correct Ans-QRS >=0.12 secs
wide QS or rS (small R deep S) configuration in V1 (or V2-3)
broad R waves in lateral leads (leads I, AVL, 5-6)
T wave slopes opposite terminal wave of QRS
low voltage EKG Correct Ans-abnormally short waves and complexes
occurs due to obesity or emphysema
ventricular hypertrophy Correct Ans-- excessive growth of ventricular myocardium in the
affected ventricle
- causes greater than normal amplitude of QRS
, CCT Exam Practice - Interpreting a 12-Lead ECG & MI's
right ventricular hypertrophy (RVH) criteria Correct Ans-R wave dominance over S wave in
V1-V2
S wave dominance over R wave in V6
T wave inversion (not an absolute requirement) in V1-V2
axis deviation Correct Ans-current travels in an abnormal direction
how is axis determined? Correct Ans-by examining lead I and lead AVF
normal axis Correct Ans-between 0 and +90
lead I: +QRS deflection
lead AVF: +QRS deflection
right axis deviation Correct Ans-between +90 and +180
lead I: -QRS deflection
lead AVF: +QRS deflection
extreme right axis deviation Correct Ans-between -90 and -180
lead I: -QRS deflection
lead AVF: -QRS deflection
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