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  • R wave

    The positive wave or deflection in the QRS complex.

  • R-on-T pattern

    A dangerous kind of PVC that is seen on the ECG to fall on the peak of the T wave, representing the occurrence of an extrasystole during the vulnerable period of ventricular repolarization and often triggering ventricular tachycardia or fibrillation.

  • R-R interval

    The period of time between the onset of one QRS complex and the onset of the succeeding QRS complex.

  • Rabbit Tool

    Hydraulic spreading tool that is specially designed to open doors that swing inward.[14]

  • raccoon sign

    Also called "coon’s eyes"; bilateral, symmetric, periorbital ecchymoses seen with some skull fractures.

  • radial

    Pertaining to the wrist.

  • Radiant extension

    fire that has transferred ignition heat to adjacent materials across open space. One reason some city fire codes prohibit windows facing each other in adjacent warehouses.

  • Radiation

    (1) Transmission or transfer of heat energy from one body of another at a lower temperature through intervening space by electromagnetic waves such as infrared thermal waves, radio waves, or X rays. (2) Energy from a radioactive source emitted in Read on! →

  • Radiation

    (1) Transmission or transfer of heat energy from one body of another at a lower temperature through intervening space by electromagnetic waves such as infrared thermal waves, radio waves, or X rays. (2) Energy from a radioactive source emitted in Read on! →

  • radioactive

    Having the property of emitting ionizing radiation.

  • Radioactive Material

    Material whose atomic nucleus spontaneously decays or disintegrates, emitting radiation

  • Radioactive Material

    Material whose atomic nucleus spontaneously decays or disintegrates, emitting radiation

  • radius

    The bone on the thumb side of the forearm.

  • Rafters

    Beams that span from a ridge board to an exterior wall plate to support roof decking. While it is important to cut away roof decking during vertical ventilation operations, cutting rafters can seriously weaken a roof and should be avoided Read on! →

  • Rain Roof

    A second roof constructed over an older roof.

  • rales

    Abnormal breath sounds produced by flow of air through constricted, edematous, or fluid-filled small airways.

  • rape

    Sexual intercourse that is inflicted forcibly on another person, against that person’s will or while they are unconscious.

  • Rapid entry team

    See FAST.

  • Rapid Intervention Crew/Group/Team (RIC, RIG, or RIT)

    This is a standby crew whose purpose is to go in for the rescue of firefighters in trouble. While all of these versions of the name for a firefighter rescue crew either have been used or continue to be used Read on! →

  • Rapid Intervention Vehicle (RIV)

    Small, quick-response fire fighting vehicle carrying at least 600 gallons of water for producing AFFF, in addition to at least 500 pounds of either dry chemical or Halon 1211.

  • Rated Assembly

    Two or more construction components combined to form an assembly that has a specific fire resistance rating. A fire door is an example of a rated assembly as well as a woof-frame wall covered with a specified thickness of gypsum Read on! →

  • Reactive Material

    Substance capable of or tending to react chemically with other substances such as a material that reacts violently when combined with air or water

  • Reactive Material

    Substance capable of or tending to react chemically with other substances such as a material that reacts violently when combined with air or water

  • Reactivity

    Ability of two or more chemical to react and release energy and the ease with with this reaction takes place

  • Reactivity

    Ability of two or more chemical to react and release energy and the ease with with this reaction takes place

  • Ready team

    A company of firefighters waiting to relieve another company.

  • Rebar

    Short for reinforcing bar. These steel bars are placed in concrete forms before the cement is poured. When the concrete sets (hardens) the rebar within it adds considerable strength.

  • Reburn

    (1) Repeat burning of an area over which a fire has previously passed, but left fuel that later ignites when burning conditions are more favorable

  • RECEO

    RECEOVES stands for Rescue, Exposures, Containment, Extinguish, Overhaul, Ventilation, Environment, Salvage. This is used at structural fires internationally, as a guide to objectives.

  • receptor

    A specialized area in a tissue that initiates certain actions upon specific stimulation.

  • Recovery

    Location and removal of deceased victims. Also, the time needed for a firefighter to spend in rehab before being considered ready to continue working the incident.

  • rectum

    The distal 1/3 portion of the large intestine. Water and potassium are reabsorbed from this area.

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