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.
Difference Between Parcel Post and Priority Mail. Parcel Post vs Priority Mail. Parcel Post and Priority Mail are two mail services offered by USPS that are comparable in cost and features. Most people, especially sellers on websites and shippers remain confused between the features of these two mail services.