Left axis deviation (LAD) is a condition whereby the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between -30Â° and -90Â°. This is reflected by a QRS complex positive in lead I and negative in leads aVF and II.
Package (or thick envelope) A package is a parcel (or box) less than 84 inches when you add the length plus girth. Length is the longest side of a package. Girth is the distance around the 2 smaller sides of a package. A thick envelope is a large envelope exceeding 3/4 inch thickness.
'parcel' and 'package' A parcel or package is an object or group of objects wrapped in paper, that can be carried somewhere or sent by post. The two words have almost exactly the same meaning in British English, but a parcel usually has a more regular shape than a package.