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.
On the other hand, within First Class Package shipping, there is a package type we refer to as a Thick Envelope (3/4). It can be used to ship documents or thin objects that are less than 3/4 thick. It can be a little more expensive, but it includes tracking.