| sinoatrial recovery time | <cardiology, physiology> Interval from the last paced P wave to the first succeeding spontaneous P wave (after 2 to 5 minutes of right atrial pacing at 120 to 140 beats per minute, and when expressed as percentage of control cycle length, it normally ranges from 115 to 159%). (05 Mar 2000) |
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| sinoatrial conduction time | <cardiology, physiology> The time required for an impulse to travel from the sinoatrial node to the atrium; estimated indirectly during asystole by halving the average interval from the premature beat to the following normal sinus beat of the atrium. (05 Mar 2000) |
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| sinoatrial | <anatomy> Relating to the sinus venosus and the right atrium of the heart. Synonym: sinuatrial. (20 Jun 2000) |
| sinoatrial block | <cardiology, physiology> Disturbance of heart conduction in which the atrial response is delayed or omitted because of partial or complete interference with the propagation of impulses from the sinoatrial node to the atria. (12 Dec 1998) |
| sinoatrial chamber | <anatomy> The common chamber formed by the single embryonic atrium and the right and left horns of the sinus venosus. (20 Jun 2000) |
| sinoatrial nodal artery | <anatomy, artery> A branch usually of the right coronary artery that supplies the sinuatrial node. Synonym: sinus node artery. (05 Mar 2000) |
| sinoatrial node | <anatomy, cardiology, physiology> The impulse generating (pacemaker) tissue located in the right atrium, under the epicardium at the upper end of the sulcus terminalis. The specialised cardiac muscle fibres generate cardiac impulses that normally acts as the pacemaker of the cardiac conduction system. Normal impulses start in the sinoatrial node and are transmitted to the ventricles, through the atrioventricular node and into the bundle of His. Synonym: nodus sinuatrialis, atrionector, Flack's node, Keith and Flack node, Keith's node, Koch's node, sinoatrial node, sinus node. (20 Jun 2000) |
| tachycardia, sinoatrial nodal reentry | A tachycardia arising from the sinus node region and characterised by rates between 115 and 140 beats per minute. It is paroxysmal rather than constant. (12 Dec 1998) |
| anaesthesia recovery period | The period of emergence from general anaesthesia, where different elements of consciousness return at different rates. (12 Dec 1998) |
| recovery | 1. A getting back or regaining; recuperation. 2. Emergence from general anaesthesia. 3. In nuclear magnetic resonance, refers to relaxation. Origin: M.E., fr. O.Fr. Recoverer, fr. L. Recupero, to recover, get back, fr. Re-, again, + capio, to take (05 Mar 2000) |
| recovery boiler | A pulp mill boiler in which lignin and spent cooking liquor (black liquor) is burned to generate steam. (05 Dec 1998) |
| recovery room | Hospital unit providing continuous monitoring of the patient following anaesthesia. (12 Dec 1998) |
| recovery score | A number expressing the condition of an infant at various stipulated intervals greater than 1 minute after birth and based on the same features assessed by the Apgar score at 60 seconds after birth. (05 Mar 2000) |
| materials recovery facility | A recycling facility for municipal solid waste. (05 Dec 1998) |
| resource conservation and recovery act | (RCRA) A federal law regulating solid and hazardous waste. RCRA governs the generation, storage, treatment, transport, and disposal of hazardous waste. (05 Dec 1998) |
| creep recovery | The time-dependent portion of the decrease in strain in a material or object following removal of the stress that has deformed it. (05 Mar 2000) |