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  • p

    An abbreviation meaning "after". (post)

  • P wave

    The first wave of the ECG complex, representing depolarization of the atria.

  • P-QRS-T

    The ECG representation of one cycle of depolarization and repolarization of the atria and ventricles.

  • P-R interval

    The period of time between the beginning of the P wave (atrial depolarization) and the onset of the QRS complex (ventricular depolarization), signifying the time required for atrial depolarization and passage of the excitation impulse through the AV junction.

  • PAC

    An abbreviation for premature atrial contraction.

  • pacemaker

    Specialized tissue within the heart that initiates excitation impulses; an electronic device used to stimulate cardiac contraction when the electric conduction system of the heart is malfunctioning, especially in complete heart block. An electronic pacemaker consists of a battery-powered pulse Read on! →

  • pacemaker site

    The site in any part of the electric conduction system where excitation impulses arise.

  • Packables

    A term used to refer to fire personnel that are certified and trained with SCBA Apparatus.

  • Packaging

    Broad term used by the U.S. Department of Transportation (DOL) to describe shipping containers and their markings, labels, and/or placards

  • Packaging

    Broad term used by the U.S. Department of Transportation (DOL) to describe shipping containers and their markings, labels, and/or placards

  • palate

    The roof of the mouth.

  • pallor

    Paleness of the skin.

  • Palmer drought severity index (PDI)

    Technique for measuring impact of soil moisture changes on vegetation, for predicting fire danger and fire behavior.

  • palpation

    Feeling a part of a patient’s body with the hand to assess the consistency of the parts beneath, in physical diagnosis.

  • palpitation

    A sensation,felt under the left breast, of the heart’s "skipping a beat," caused by premature ventricular contraction.

  • palsy

    Paralysis.

  • pancreas

    An intra-abdominal gland that secretes insulin and important digestive enzymes.

  • Panic doors, panic hardware

    Fire safety appliance permitting locked doors (typically self-closing) to be opened from the inside when pressed with sufficient force, thus permitting a person to open the door without having to turn a knob or lever.

  • Panic Hardware

    Type of door-latching assembly incorporating a device that releases the latch upon the application of a force in the direction of egress travel

  • Panic Hardware

    Type of door-latching assembly incorporating a device that releases the latch upon the application of a force in the direction of egress travel

  • papillary muscle

    Protrusions of the myocardium into the ventricular cavities to which the chordae tendineae are attached.

  • para-

    A prefix meaning "beside".

  • paracentesis

    The draining of fluid from the peritoneal cavity by means of a needle or catheter inserted through the abdominal wall.

  • paradoxal respiration

    The situation in which attempts to inhale cause collapse of a portion of the chest wall instead of expansion. It is seen in flail chest.

  • Parallel attack

    Fire containment method where crews construct a fireline at some distance from the edge of the fire (e.g., 100 yards) and then burn out the fuel in the buffer as the fireline is completed.

  • Parallel Chord Truss

    A truss constructed with the top and bottom chords parallel. These trusses are used as floor joists in multistory buildings and as ceiling joists in buildings with flat roofs.

  • paralysis

    Loss of motor function.

  • paramedic

    A highly trained medical professional who can assist physicians to deliver emergency, and now primary care. A health care professional with two years of college training and an associates degree in Paramedic Emergency Medicine. Many states now license these medical Read on! →

  • paranoia

    A mental disorder characterized by abnormal suspicions or other delusions (often of persecution or grandeur).

  • Parapet

    Portion of an exterior wall that extends above the level of the roof

  • Parapet

    A wall at the edge of some roofs. Most parapet walls range from a few inches to a few feet in height, but they can be high enough to require a ladder to reach the roof from the top of Read on! →

  • Parapet

    Portion of an exterior wall that extends above the level of the roof

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