QRS complex
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  QRS complex

QRS complex

    This is the main part of the heart beat visible on the EKG, which represents the contraction of the heart's ventricles. This is the Big spike you see in the complex.


The hollow, muscular organ responsible for pumping blood through the circulatory system.


During labor, the strong, rhythmic tightening of the uterus. Pre-laborcontractions are usually irregular and don't increase in intensity orduration.

The lower, pumping chambers of the heart. The heart has two ventricles - the right and left ventricle.



Quadriplegia is caused by damage to the spinal cord at a high level (e.g. cervical spine) or the brain. The injury causes the victim to lose use of the arms and legs. The condition is also termed tetraplegia; both terms mean "paralysis of four limbs".

Q Fever
An acute disease resembling influenza. Q Fever is caused by the strictly intracellular, gram negative bacterium Coxiella burnetii which proceeds asymptomatic and self-limiting in 60% of the cases. The infectious organism is commonly found in cattle, sheep, goats and other domestic mammals. The infection results from inhalation of contaminated particles of the inhaled air. The incubation time is 9-40 days.

Quervain's tenosynovitis
(De) Quervain's tenosynovitis. Tendonitis of extensor pollicis brevis and abductor pollicis longus at the radial side of the wrist. i.e. at the thumb side of the wrist.

The first fetal movements felt by a pregnant woman, usually between the 18thand 22nd weeks. They can be felt as early as the 14th week and sometimes not until the 26th.

QRS complex

The name applied collectively to a group of four thigh muscles that insert together into the tendon surrounding the kneecap.

Any isolation or restriction placed on movement to or from a place where communicable diseases have been diagnosed.

Quality of life
Refers to the level of comfort, enjoyment, ability to pursue daily activities. Often used in discussions of treatment options.

Qualitative variable
One that cannot be measured numerically (race or sex for example).

Quantitative variable
One that can be measured (blood pressure, for example).

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