Which of the following is a direct technique of uterine contraction in cardiotocographic monitoring?

Which of the following is a direct technique of uterine contraction in cardiotocographic monitoring? Correct Answer Intrauterine pressure measurement

The following techniques are commonly used in uterine contraction in most of the cardiotocographic monitoring: I) Indirect method: Tocodynamometry (using tocotonometer to sense changes in uterine tension transmitted to abdominal skin surface) II) Direct method: Intrauterine pressure measurement (using a fluid-filled intracervical catheter with strain gauge transducer).

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_______ is a direct technique of uterine contraction in cardiotocographic monitoring.
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Pacemaker of uterine contraction is