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At least 91 records · Page 5Linked to original sources
PubMed1981

A comparison of the initial pain response following insertion of the Copper 7 and combined Multiload Copper 250-short IUDs.

The immediate postinsertion and 3 minute postinsertion pain response in nulliparous women undergoing insertion of either the Copper 7 (Cu 7) or the Multiload Copper 250-short (ML Cu 250-short) IUD has been studied. 35 women were fitted with a Cu 7 device and 23 with the ML Cu 250-short. The immediate postinsertion pain scores were significantly higher in the ML Cu 250-short group than in the Cu 7 group. There was no significant difference between the 3 minutes postinsertion scores for the 2 groups. The 3 minute pain scores were significantly lower than the immediate pain scores for each individual device group. Immediate postinsertion IUD pain may be related to the presenting diameter and insertional mechanism of the device. This pain is of short duration and after 3 minutes, the level of pain is independent of the type of device which has been inserted. The rapid diminution of pain at 3 minutes postinsertion indicates that the routine use of certain analgesic techniques, e.g., paracervical block before IUD insertion, is not justified. Pain following IUD insertion may provide a useful model for the study of various types of peripheral and centrally acting analgesics.

Chemical Phenomena↗
PubMed1982

Malonaldehyde production around copper IUDs.

Specimens of cervical mucus from 7 women fitted with copper IUDs were placed immediately after collection in liquid nitrogen. These specimens were shown by electron paramagnetic resonance measurements to contain statistically significantly higher concentrations of free radicals than similar specimens from 6 women fitted with plastic Lippes loops. Cervical mucus, collected from women immediately prior to elective removal of an IUD, was placed in 2M hydrochloricacid and later analyzed for malonaldehyde using a newly developed polarographic method. Positive results were obtained for 8 of 19 women fitted with copper IUDs, but for none of 21 women fitted with plastic devices. Cervical mucus was similarly collected from 10 women fitted with copper IUDs, 9 women fitted with plastic IUDs, and an additional 9 using other methods of contraception. Mucus was collected 3 times (early, middle, and late cycle). No malonaldehyde was detected in mucus from women with plastic IUDs, or other contraceptive methods. Positive results were obtained in 13 of 29 mucus specimens from those using copper IUDs. Stage of menstrual cycle did not influence the percentage of positive results. Malonaldehyde was detected in vitro in solutions of arachidonate or prostaglandin F2alpha in buffered saline incubated with sterile copper IUD, but not with the plastic. Rate of malonaldehyde production was markedly influenced by pH, temperature, agitation, substrate concentration, and size of gas-liquid interface. the rates of malonaldehyde production around the copper IUD in utero are unknown. The possible increased risk of carcinogenicity associated with the copper IUD is discussed.

Biology↗
PubMed1977

Electrochemical effects of metals on IUDs.

Electrochemical effects within the uterus are being studied, particularly as they pertain to IUDs made in total or in part of metals. The intrauterine potential as measured with either metal or nonpolarizable salt electrodes is positive at the fundal with respect to the cervical end of the uterus. Placement of dissimilar metal electrodes within the uterus will induce voltage gradients that are roughly predictable from their cell potential in blood as an electrolyte. When copper and zinc electrodes are placed at opposite ends of the uterus, they induce voltage gradients that are typically greater than 100 mv per cm. External copper and zinc wires connected at one end, and with the other ends in contact with various positions on the skin of rats, were found to influence potential gradients within the uterus. When a length of zinc wire was wound around the upper portion of the stem of a small Cu-7 200 IUD, it took about 1 year from insertion for the zinc to disappear. When the zinc wire was wound around the lower portion of the stem, it disappeared in 1 month. The zinc reduced intrauterine corrosion of the copper and it was more effective at reducing copper corrosion when in the lower stem position.

Action Potentials↗