| abstract | - A tocodynamometer, or toco for short, is a transducer pressure-sensing device that can detect the changes in your abdomen as your uterus tightens during a contraction. It marks how often contractions occur and the length of each, producing a graph that looks like a series of hills rolling across the bottom of the printout. The external contraction monitor can't tell how strong a contraction is, since the size of the "hill" is affected by the tightness of the belt and if you are thin or heavy. If a precise measurement of the strength of the contraction is needed, an internal-pressure monitor can be placed inside the uterus.
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