Sum of two vectors having an included angle greater than ninety degrees

Document Type

Article

Publication Date

7-8-1975

Institution/Department

Cardiology

Journal Title

Journal of electrocardiology

MeSH Headings

Cardiomegaly (physiopathology); Humans; Mathematics; Vectorcardiography

Abstract

If the angle between two vectors is acute an increase in either vector will increase the resultant. If the angle is obtuse, however, an increase in one vector may either decrease or increase the resultant. A mathematical derivation and a simple geometric construction are presented. The theory is applied to vectors in the horizontal plane in right ventricular hypertrophy. It is shown that as the right ventricular vector is increased from a small value, the resultant vector may first decrease and then increase again with a continuous clockwise rotation.

ISSN

0022-0736

Comments

Maine Medical Center Historical Publications

First Page

285

Last Page

6

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