| NTD | neural tube defect; nitroblue tetrazolium dye; noise tone difference; 5'-nucleotidase |
|---|---|
| PTAT | pure tone average threshold |
| ST | esotropia; scala tympani; scaphotrapezoid; sclerotherapy; sedimentation time; semitendinosus; sensor... |
| TD | tabes dorsalis; tardive dyskinesia; T-cell dependent; temporary disability; terminal device; tetanus... |
| TDT | terminal deoxynucleotidyltransferase; thermal death time; tone decay test; tumor doubling time |
| auriculoventricular interval | The time between depolarisation of the atria and of the ventricle. Synonym: atrioventricular interval. (05 Mar 2000) |
|---|---|
| A-V interval | The time from the beginning of atrial systole to the beginning of ventricular systole as measured from pressure pulses or cardiac volume curves in animals, or from the electrocardiogram in humans. (05 Mar 2000) |
| BH interval | The duration of the His bundle deflections (normally 15-20 msec). (05 Mar 2000) |
| cardioarterial interval | The time between the apex beat of the heart and the radial pulse beat. (05 Mar 2000) |
| P-A interval | The time from onset of the P wave to the initial rapid deflection of the A wave in the His bundle electrogram (normally 25-45 msec); it represents the intra-atrial conduction time. (05 Mar 2000) |
| R-R interval | The time elapsing between two consecutive R waves in the electrocardiogram. (05 Mar 2000) |
| P-J interval | The time elapsing from the beginning of the P wave to the end of the QRS complex (J for junction between QRS and S-T segment) in the electrocardiogram. (05 Mar 2000) |
| confidence interval | A range of values for a variable of interest, constructed so that this range has a specified probability of including the true value of the variable. (05 Mar 2000) |
| coupling interval | The interval, usually expressed in hundredths of a second, between a normal sinus beat and the ensuing premature beat. (05 Mar 2000) |
| P-P interval | The distance between consecutive P waves in the electrocardiogram. (05 Mar 2000) |
| P-Q interval | In the electrocardiogram, the time elapsing between the beginning of the P wave and the beginning of the next QRS complex; it corresponds to the a-c interval of the venous pulse and is normally 0.12-0.20 sec. Synonym: P-Q interval. (05 Mar 2000) |
| P-R interval | In the electrocardiogram, the time elapsing between the beginning of the P wave and the beginning of the next QRS complex; it corresponds to the a-c interval of the venous pulse and is normally 0.12-0.20 sec. Synonym: P-Q interval. (05 Mar 2000) |
| H-V interval | The time from the initial deflection of the His bundle (H) potential and the onset of ventricular activity (normally 35-45 msec). (05 Mar 2000) |
| sphygmic interval | The period in the cardiac cycle when the semilunar valves are open and blood is being ejected from the ventricles into the arterial system. Synonym: ejection period. (05 Mar 2000) |
| Sturm's interval | The distance between the anterior and posterior focal lines in a spherocylindrical lens combination. (05 Mar 2000) |