| HRT | heart rate; hormone replacement therapy |
|---|---|
| IIFT | itraoperative intraarterial fibrinolytic therapy |
| INTACT | International Nifedipine Trial on Antiatherosclerotic Therapy |
| IRTIS | Integrated Radiation Therapy Information System |
| IST | inappropriate sinus tachycardia; insulin sensitivity test; insulin shock therapy; International Soci... |