ECG quiz Flashcards
what is the duration of a normal PR interval
between 0.12-0.2 seconds (3-5 small squares)
what does a long PR interval mean
suggests the presence of heart block
what does a short PR interval mean
may suggest the presence of an accessory pathway between the atria and the ventricles eg. wolff parkinson white syndrome
how do you calculate rate
the number of large squares in the RR interval divided by 300
what is the most common cause of left axis deviation
defects in the conduction system
(rarely a result of left ventricular hypertrophy)
what view of the heart do leads I, aVL, V5, and V6 represent
lateral
what are the typical ECG findings of Mobitz type 1 heart block
second degree heart block type 1 is a disease of the atrioventricular node
findings include progressive prolongation of the PR interval with associated regular dropping of QRS complexes
what is the normal duration of a QRS complex
70-110 milliseconds (2-3ish small squares)
what does a wide QRS complex indicate
inefficient ventricular conduction eg. bundle branch block
what is a common cause of right axis deviation
right ventricular hypertrophy
