| NLE | neonatal lupus erythematosus |
|---|---|
| NLF | neonatal lung fibroblast; nonlactose fermentation |
| NMR | neonatal mortality rate; nictitating membrane response; nuclear magnetic resonance |
| NN | neonatal; nevocellular nevus; normally nourished; normal nutrition; nurse's notes |
| NNAS | neonatal narcotic abstinence syndrome |
| refractory period of electronic pacemaker | The time required to restore full sensitivity after detecting cardiac activity or delivering a pacing impulse. (05 Mar 2000) |
|---|---|
| refractory period, psychological | A delayed response interval occurring when two stimuli are presented in close succession. (12 Dec 1998) |
| relative refractory period | The period between the effective refractory period and the end of the refractory period; fibres then respond only to high intensity stimuli and the impulses conduct more slowly than normally. (05 Mar 2000) |
| vulnerable period | Vulnerable period of heart, a brief time during the cardiac cycle when stimuli are particularly likely to induce repetitive activity like tachycardia, flutter, or fibrillation which persists after the stimulus has ceased; for the ventricle, it occurs during the latter part of systole, during the relative refractory period coincident with the inscription of the latter half of the T wave of the electrocardiogram. (05 Mar 2000) |
| menstrual period | <medicine> The catamenial or menstrual discharge, a periodic flow of blood or bloody fluid from the uterus or female generative organs. Origin: L. Mensis month, pl. Menses months, and the monthly courses of women. Cf. Month. Source: Websters Dictionary (01 Mar 1998) |
| period | Drosophila gene regulating circadian rhythm. See: timeless. (18 Nov 1997) |
| missed period | The failure of menstruation to occur in any month at the expected time. (05 Mar 2000) |
| mitotic period | The period of the cell cycle in which all phases of mitosis occur. Synonym: M phase. (05 Mar 2000) |
| Wenckebach period | A sequence of cardiac cycles in the electrocardiogram ending in a dropped beat due to A-V block, the preceding cycles showing progressively lengthening P-R intervals; the P-R interval following the dropped beat is again shortened. (05 Mar 2000) |
| crisis period | A situation in which most of the secondary cells in a culture die off, even though conditions exist which should normally be favorable for their growth. (09 Oct 1997) |
| critical period | <psychology> A specific stage in animal and human development during which certain types of behaviour normally are shaped and molded for life. (12 Dec 1998) |
| postoperative period | The period following a surgical operation. (12 Dec 1998) |
| postprandial period | Occurring after dinner, or after a meal. (12 Dec 1998) |
| hamilton period | <geology> A subdivision of the Devonian system of America; so named from Hamilton, Madison Co, new York. It includes the Marcellus, Hamilton, and Genesee epochs or groups. Source: Websters Dictionary (01 Mar 1998) |
| preejection period | The interval between onset of QRS complex and cardiac ejection; electromechanical systole minus ejection time. (05 Mar 2000) |