How long will the fetus die if the fetal heart rate is too fast?

Under normal circumstances, the fetal heart rate should be 110-160 beats/min. If the fetal heart rate is too fast, how long can the fetus die? This is really hard to say. Because the fetus has different tolerance to hypoxia, some times may be longer, some times may be shorter. If the fetal heart rate is too fast, oxygen therapy must be carried out in time. Generally, after oxygen inhalation, the symptoms of hypoxia will improve, and this phenomenon of rapid fetal heart rate will gradually ease. If oxygen is not given in time, the fetal heart rate may gradually slow down from fast to slow, that is, it will gradually be lower than 110 beats per minute, then this situation indicates that hypoxia is more serious. If hypoxia is lighter, it will show that the fetal heart rate increases. Severe hypoxia will be found significantly reduced fetal movement, and even may show fetal movement disappeared, that is, stillbirth.