| ISE | inhibited sexual excitement; International Society of Endocrinology; International Society of Endosc... |
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| Isp | spatial peak intensity [pulse] |
| Isppa | spatial peak pulse average intensity |
| Ita | temporal average intensity [pulse] |
| Itp | temporal peak intensity [pulse] |
| fixed rate pulse generator | A generator in which the rate of discharge is independent of the natural activity of the heart. Synonym: fixed rate pulse generator. (05 Mar 2000) |
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| labile pulse | Frequent changes in pulse rate. (05 Mar 2000) |
| long pulse | A pulse in which the impact is felt longer than usual. (05 Mar 2000) |