With external radiation, a machine is used to send targeted radiation to the cancer site. A mesh mask is used on the patenting order to keep their head and neck still while the machine rotates to send out beams of radiation. In undergoing this kind of treatment, healthy cells may also be damaged during the process. Therefore, there are 2 other forms of radiation therapy that decreases the likelihood of damaging nearby healthy cells: intensity-modulated radiation therapy and stereotactic radiation therapy. Intensity-modulated radiation therapy (IMRT) uses 3D images of the size and shape of the tumor to then direct thin beams of radiation at different intensities from multiple angles. In stereotactic radiation therapy, radiation is aimed directly at the tumor. in this therapy, the total amount of radiation is divided into smaller does that will be given over the course of several days.Using radiation therapy as a cancer treatment method depends on the type and stage of cancer, however, internal and external radiation therapies can be used to treat NPC. If external radiation therapies are being aimed at the thyroid, then this could affect the way the thyroid works. For that reason, blood tests are done before and after radiation to check thyroid hormone levels. Chemotherapy
Chemotherapy works as cancer treatment by using drugs that stop the growth of cancer cells, by either killing the cells or preventing them from dividing. This kind of therapy can be administered systemically or regionally.
Signs and symptoms
Generally it is preferable to describe specific signs in lieu of declaring fetal distress that include:

Decreased movement felt by the mother
Meconium in the amniotic fluid ("meconium stained fluid")
Non-reassuring patterns seen on cardiotocography:
increased or decreased fetal heart rate (tachycardia and bradycardia), especially during and after a contraction
decreased variability in the fetal heart rate
late decelerations
Biochemical signs, assessed by collecting a small sample of babys blood from a scalp prick through the open cervix in labor
fetal metabolic acidosis
elevated fetal blood lactate levels (from fetal scalp blood testing) indicating the baby has a lactic acidosisSome of these signs are more reliable predictors of fetal compromise than others. For example, cardiotocography can give high false positive rates, even when interpreted by highly experienced medical personnel. Metabolic acidosis is a more reliable predictor, but is not always available. Complications
Complications are primarily those associated with insufficient fetal oxygenation, most notably increased mortality risk. Other complications include fetal encephalopathy, seizures, cerebral palsy, and neurodevelopmental delay. Causes
Several conditions and risk factors can lead to fetal distress or non-reassuring fetal status, including:

Low amniotic fluid (oligohydramnios)
If there is too little amniotic fluid around the baby in the uterus, the baby can have trouble moving around in the uterus and its growth and temperature can be impacted. Low amniotic fluid can be caused by placental issues, high gestational blood pressure, some medications, as well as problems with the fetal kidney or urinary tract.