Vibroacoustic stimulation (VAS), sometimes referred to as fetal vibroacoustic stimulationorfetal acoustic stimulation test (FAST), is the application of a vibratory sound stimulus to the abdomen of a pregnant woman to induce FHR (fetal heart rate) accelerations. The presence of FHR accelerations reliably predicts the absence of fetal metabolic acidemia. Vibroacoustic stimulation is typically used during a nonstress test (NST).[1][2]
In 2013, the Cochrane Database of Systematic Reviews concluded that there was insufficient evidence from randomized trials to support its use to assess fetal well-being in labor.[3] A related Cochrane Review, however, concluded that its use in antenatal testing did reduce the incidence of non-reactive cardiotocography and the overall testing time.[4]
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Tests and procedures relating to pregnancy and childbirth
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| Delivery |
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Pregnancy and childbirth
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| Prenatal |
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| Obstetric history |
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