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Rugae

Anatomical folds especially of the viscera.

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Rubber

An elastic substance obtained from the latex of many tropical plants, especially Hevea braziliensis…

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RSV

Respiratory Syncytial Virus

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RQ

Respiratory Quotient

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RFA

Radiofrequency Annuloplasty

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Respiratory zone

The portion of the respiratory system consisting of gas-exchange units called alveoli. Organized into…

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Restenosis

Recurrence of stenosis after corrective surgery (heart valve, narrowed artery, etc.).

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Resting metabolic rate (RMR)

Amount of energy expended 2 hours post-absorption of a meal under conditions of rest…

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Restricted area

Of the operating room suite – an area where masks as well as scrub…

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Restrictive Disease

Pulmonary disease marked by pathophysiologic changes that limit the amount of lung inflation (e.g.,…

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Retrograde

Moving backwards or in reverse direction.

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