the goal of this clinical trial is to compare the measurement of cardiac output, systolic ejection volume and vascular filling in pregnant women with the new non-invasive measurement techniques of the Index of contractility monitor (ICON) and the Ultra Sonic Cardiac Output Monitor (USCOM) in pregnant women compared to trans-thoracic ultrasound as the gold standard of non-invasive techniques The Secondary objective is to evaluate patient comfort between the 3 techniques, examination time and examiner satisfaction. The main question it aim to answer is the absence or a low difference in cardiac output measurement ( less than 30 %) between the non invasive measurement methods ( USCOM/ICON) and the trans thoracic cardiac echography in pregnant women in the first and third trimester.
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difference in cardiac output
Timeframe: 18 month