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ectopic atrial tachycardia as the P-waves are upright in lead aVR and negative in lead II.

a Q wave of any size in lll and aVR   is  normal

loss of R wave progression from V1 to V4 is indications of left ventricular myocardial loss

only lead l reveals true QRS duration

low voltage when QRS is not above 1 big square in any limb lead and 2 bid square in any chest lead

upper limit of T wave is one large square in limb lead and 1.5 square in chest lead...women are 2thirds of these values

in lead l  S wave>R wave is a there gold of right axis deviation

right axis deviation is present  in hyperkalaemia and pulmonary embolism

a normal p wave with short pR internal.....accessory pathway+delta wave

abnormal p wave with short PR....rhythm from atria elsewhere SA node

p wave is a distortion in T wave..ventricular rhythm