| q-machine | <radiobiology> Plasma device studied in the 1960s, noted for its natural quiescence, which made it attractive for plasma wave phyics experimentation. (09 Oct 1997) |
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| Q-R interval | The time elapsing from the onset of the QRS complex to the peak of the R wave; measures the time of onset of the intrinsicoid deflection if determined in an appropriate unipolar lead tracing. (05 Mar 2000) |
| Q-RB interval | The time between the onset of the Q wave of the QRS complex and the right bundle-branch potential (normally 15-20 msec). (05 Mar 2000) |
| Q-S2 interval | electromechanical systole |
| q-sort | A personality assessment technique in which the subject or observer indicates the degree to which a standardised set of descriptive statements actually describes the subject. The term reflects "sorting" procedures occasionally used with this technique. (12 Dec 1998) |
| q-switch | <radiobiology> Optical switch used to rapidly change the Q of an optical resonator, utilised in the optical resonator of a laser to prevent lasing action until a high level of gain and energy storage are achieved in the laser medium. When the switch is triggered and rapidly increases the Q of the cavity, a stronger laser pulse is generated. See: oscillator. (09 Oct 1997) |
| Q-T interval | Time from electrocardiogram Q wave to the end of the T wave corresponding to electrical systole. (05 Mar 2000) |
| Q10 | Symbol for the increase in rate of a process produced by raising the temperature 10캜; rate of contraction of an excised heart approximately doubles for every 10캜 (i.e., Q10 = 2). (05 Mar 2000) |
| QALY | A year of life adjusted for its quality or its value. A year in perfect health is considered equal to 1.0 qaly. The value of a year in ill health would be discounted. For example, a year bedridden might have a value equal to 0.5 qaly. A measurement index derived from a modification of standard life-table procedures and designed to take account of the quality as well as the duration of survival. This index can be used in assessing the outcome of health care procedures or services. (12 Jul 2000) |
| QCO2 | Symbol for the microliters STPD of CO2 given off per milligram of tissue per hour. (05 Mar 2000) |
| qd | <abbreviation> On a prescription, qd means one a day. Origin: L. Quaque die. (12 Dec 1998) |
| qds | <abbreviation> On a prescription, qds (or qid) means 4 times a day. Origin: L. Quater in die. (12 Dec 1998) |
| QF | <abbreviation> Quality factor, the same as relative biologic effectiveness in radiation protection. (05 Mar 2000) |
| qh | <abbreviation> On a prescription, qh means every hour. Origin: L. Quaque die. (12 Dec 1998) |
| QH2 cytochrome C reductase | <enzyme> Membrane bound complex in the mitochondrial inner membrane, responsible for electron transfer from reduced coenzyme Q to cytochrome C. Contains cytochromes b and c1 and iron sulphur proteins. (18 Nov 1997) |