Modulation of potassium channels is a recent modern approach to experimental and clinical investigation of potential better tocolytic medications. Assuming that potassium channels are by far the largest category of cellular ion channels, they are of crucial importance for the regulation of uterine smooth muscle tone. In the vast category of potassium channels, Maxi-K and BKCa (highly conductive, calcium-activated channels) are considered the main channels in the myometrium. It is believed that those have a key role in the modulation of uterine contractility and the homeostasis of myometrial calcium. The total number of Maxi-K channels is doubled during the onset of labor, compared to their number in pregnant and non-pregnant myometrium. We also keep getting more familiar with the characterization and control of myometrial potassium channels. Certain effects of pharmacological potassium channel modulators in isolated parts of both human and animal, both pregnant and non-pregnant myometrium will be presented in this article. Even though there have been a lot of studies on this subject, not many of them mentioned the role and modulation of potassium channels during human labor. We are still looking for the substances that will perform best in the treatment of possible miscarriages and early labor; although the use of beta sympathomimetics and calcium channel antagonists has been a major breakthrough in treatment of these pregnancy disorders. Using new tocolytic medications and a selective approach to cases of early labor, along with the use of other adequate measures, could improve the treatment of early labor in the future.

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