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Tachycardia An abnormal increase in heart rate above an age-specified rate
Tachypnea An elevated respiratory rate
Theta Activity EEG activity with a frequency of 4-7 Hz, generally maximal over the central and temporal cortex
Tidal Volume (VT) The amount of air passing in and out of the lung during and normal resting breath
Time Constant A mathematical expression describing the relative efficacy of lung unit filling and emptying, and computed as the product of compliance times resistance, with a resulting measure in seconds
Total Recording Time The interval from the beginning of the sleep recording to the end of the sleep recording
Total Sleep Period (sleep period time) The period of time measured from sleep onset to final awakening; In addition to the total sleep time, it is comprised of the time taken up by arousals and movement time until wake-up
Total Sleep Time (TST) The amount of actual sleep time in a sleep period; Equal to the total sleep period less movement and awake time; Total sleep time is the total of all REMS and N-REMS in a sleep period
Tracheostomy An artificial opening in the trachea that facilitates the passage of air or removal of secretions
Trigger Irritants or allergens found both indoors and outdoors that make it difficult to keep asthma under control; As pertaining to mechanical ventilation; Normally a patient effort to begin inhalation

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