ECG III: Chamber enlargement Flashcards
what are three etiologies for atrial enlargement?
mitral / tricuspid disease
ischemia
HTN
what is P mitrale?
LA conduction abnormality
what is P pulmonale?
RA conduction abnormality
what is the morphology of P waves in atrial abnormality?
RAA - tall, peaked, P waves in lead II
LAA - notched P waves in lead II, wide and deep terminal forces in V1
what is the duration of P waves in atrial abnormality?
greater than 0.12 s
which lead is the best for looking at waves and intervals?
lead II
what are two general etiologies of ventricular enlargement?
pressure overload
volume overload
what are the features of the R waves and S waves in RVH?
R wave - tall waves over right precordium
S wave - deep waves over left precordium
what is the morphology of the QRS complex in RVH?
usually normal
what is the morphology of the ST segment and T wave in RVH? which leads is this seen in?
ST depression with upward convexity
inverted T waves
right precordial leads
a tall peaked P wave in lead II indicates what condition?
RAA
what is the duration of QRS in LVH?
CAN be prolonged
what is the amplitude of QRS in LVH?
usually high voltages
what is the vector of QRS in LVH?
QRS axis in two planes
