Advanced Reference: Often expressed as deaths per thousand of the population. The mortality rate of a disease is the ratio of deaths from the disease to the total number of cases.

Mouth gag Quick Reference: Anaesthetic adjunct used to open the mouth.

Advanced reference: A number of designs are available, the most commonly available being the Ferguson, which remains open due to a ratchet-type mechanism and the Mason's which contains a fixation screw to maintain the set degree of opening.

MRI Quick Reference: Magnetic resonance imaging.

Advanced Reference: Imaging system used for diagnostic purposes, with many benefits over X-ray and computerised tomography (CT) scan. MRI provides an unparalleled view inside the body. It is the method of choice for the diagnosis of many types of injuries and conditions because of the ability to tailor the examination to the particular problem.

MRSA Quick Reference: Methicillin-resistant Staphylcoccus aureus.

Advanced Reference: Involves bacteria (Staphylcoccus aureus) which have become resistant to the antibiotic methicillin, hence the term MRSA. At the present time, hospital acquired MRSA and associated deaths is increasing at alarming rates.

Mucous membrane Quick Reference: Membrane that secretes mucus.

Advanced Reference: A layer of delicate skin-like tissue which contains glands that secrete mucous. Examples are the linings of the air passages and digestive tract, areas that have contact with the exterior.

Multifocal Quick Reference: Term applied to abnormal heartbeat groupings.

Advanced Reference: Multifocal ectopic beats stem/originate from different focus areas of the heart. Also, multiformed indicates ectopic beats composed of more than one shape.

Murmur Quick Reference: Heart sounds heard through a stethoscope in addition to the normal heart sounds.

Advanced Reference: These sounds may be due to vibrations and turbulence as the blood passes through the chambers and valves of the heart. Their presence does not necessarily indicate that disease is present. n

Muscle Quick Reference: The most abundant tissue in the human body. g Responsible for various types of movement.

Advanced Reference: There are three types of muscle in the human £

body and differ in structure and function, namely striated (striped), §

smooth (involuntary) and cardiac. ■!

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