Expectant mothers in the labor room, abdominal tied on two
monitors, and then connect to a larger instrument. This machine is fetal monitor. Through the monitoring of fetal monitor, the doctor can not only know mother's uterine changes, but also grasp the basic fetal in utero. The fetal monitor has been applied in clinical practice, some people even called it "the patron saint of the fetus".
Part 1
Effect
Fetal monitor is basically composed of Doppler heartbeat detector and a pressure detector of an instrument, the device in pregnant women or the maternal abdomen, monitoring and continuous recording the frequency and intensity of uterine contraction, and can monitor fetal heart rate changes.
It can be seconds continuously detected FHR and uterine contraction and paint the two data, showing that the two curves were recorded. Health care workers from the two curves of the relevant changes, you can determine whether the fetus is good (there is no oxygen), the umbilical cord is oppressed, the placental function is not bad or aging (if there is, it may cause fetal hypoxia).
What position is tied up?
Two monitor fetal monitor respectively tied to the uterus and fetal heart position. Tie the fetal monitor action by the medical staff, in principle, should not be tied to the wrong problem. However, monitoring of uterine contraction of the pressure device with a tight and loose, will affect the uterine contraction intensity of the discriminant. Having said that, expectant mothers don't have to worry, because the detection of uterine contraction frequency is still correct.
In addition, medical personnel can also be prospective mother's intensity of uterine contraction by observing the pain of pregnant women performance (such as: that very loudly, facial features pulled together) and fetal heart sounds reaction to judge.
Double (multiple) cell
Fetal monitor used in double (multiple births, principle and singleton is the same, but, in monitoring fetal heartbeat will be changed from a to two, respectively, to monitor a, B two fetal heart rate changes, if the above is the triplets, then had to take turns monitoring fetal heart condition.
Can you move it when you are monitoring?
Do not know if you have had a bit of experience, even if the health care workers tell you that this is a soft needle, you can free to play, but you are still afraid of the needle will run away, so, not casual. Tie up the fetal monitor can move? Is this similar to that?
Doctors said: as long as the right to the location, pregnant women can still stand up, or even sit up, if you do not want to sit and have nothing to do, as long as the length of the line, pregnant women can even walk around. Of course, because of the different posture, the location of the monitoring may be run away, at this time as long as the adjustment can be."
Under what circumstances will be used
Fetal monitor principle for pregnant women, however, if pregnant women under any of the following circumstances, may also use the by obstetricians make judgments.
(1) pregnancy induced hypertension
(2) gestational diabetes mellitus
(3) expired pregnancy
(4) intrauterine growth retardation in the fetus
(5) the past unexplained stillbirth
(6) early rupture of the amniotic membrane
(7) the amniotic fluid is too small
(8) decreased fetal movement
High risk pregnant women can be monitored once a week
The Department of Obstetrics, according to the individual condition of the mother's individual assessment of whether or not to do fetal monitoring, in general, if they belong to high-risk pregnancy, can be monitored once a week, as for how long should be monitored, Dr. Xu Mingguang said: monitoring time is not necessarily, from 10 minutes to 40 minutes are likely." Why is there such a difference? Mainly in order to confirm whether the fetus is a good response to the state. Dr. Xu Mingguang further explained that the so-called good response is monitored for 20 minutes, 3 times more than the movement and rising phenomenon associated with fetal heartbeat. Therefore, if 10 minutes detected more than 3 times of fetal movement, then as long as 10 minutes, if you happen to run into fetus in sleep, then wait until the baby woke up, possible to monitor 40 minutes long.
To ensure the safety of the calculation of fetal movement, fetal
Expectant mothers in after 32 weeks of gestation, fetal movement will be more and more obvious. Therefore, for the safety of the fetus, mom you must every day computing (observation) fetal movement. A day early, middle, late fixed a their most convenient time number 3 times fetal movement, 1 hour each time the number of, will be three hours of fetal movement multiplied by the total number of 4 is 12 hours in the number of fetal movement. The normal fetal number within 12 hours for more than 30 times per hour, more than 3 times in the movement.
Part 2 interpretation
Fetal monitor can measure to fetal heart rate and uterine contraction in two group signals
The above comparison is not the rule of the curve is at every time point of the fetus at every minute of the heartbeat, the number of fetal heartbeat per minute is generally between 120~160.
Below that curve represents the size of the uterine contraction force, for the same woman, the higher the curve, on behalf of the more severe uterine contraction.
Fetal heart rate
A fetal monitor recorded fetal heart rate there are two basic changes -- baseline fetal heart rate and fetal heart rate after the change.
Fetal heart rate baseline
Through the monitor tracings of fetal heart rate chart is a fluctuating band curve, the curve of the central is an imaginary line that fetal heart rate baseline. In the absence of fetal movement, no contraction effect, an average of 10 minutes more than the value of fetal heart rate, fetal heart rate baseline called. Can the number per minute from two stroke (BPM) and heart rate variability of fetal heart rate baseline to estimate.
Every minute heart beats between 120 ~ 160 between, it is normal; beats per minute more than 160 or less than 120, lasted 10 minutes and is called tachycardia or bradycardia, fetal distress signs.
Fetal heart rate has little cyclical fluctuations, including the swing frequency and the amplitude of the swing, swing to fetal heart rate on hem dynamic wave height and expressed in BPM, the amplitude fluctuation range for 10~25bpm; frequency swing refers to count the number of volatility in 1 minute, the normal is greater than or equal to 6 times. Baseline fluctuations were active, and the baseline was reduced or disappeared, with a certain reserve capacity of the fetus.
The fetal heart rate baseline is flat, suggesting that the fetus is not in good condition. If the baseline swing range of 25~30bpm or more, the reaction of fetal autonomic nervous system imbalance, such as the venous circulation is blocked, return blood flow reduce, can make the heart rate compensation increase fast, is the early performance of fetal distress.
Transient changes in heart rate
Uterine and fetal movement, palpation and sound stimulation, fetal heart rate occurred temporary speed up or slow down, lasts for more than ten seconds or tens of seconds after returned to baseline levels, known as fetal heart rate variability. Is an important indicator to determine the safety of the fetus.
Acceleration: refers to the uterine contraction after the increase in fetal heart rate temporarily 15bpm above, duration of more than 15 seconds, is a good performance of the fetus. Acceleration is due to the temporary compression of the fetal trunk or umbilical vein. Sporadic, transient fetal heart rate acceleration.
Speed: refers to the uterine contraction with transient fetal heart rate. Is divided into 3 types:
Early reduction: the characteristics of the uterine contraction, fetal heart rate decreased, uterine contraction after the cessation of fetal heart rate that is returned to normal. The decrease rate is less than 50bpm, the time is short, and the recovery is quick. Early deceleration is uterine fetal head compression, moment of brain blood flow reduction (no damage) performance, generally in the fetal head in the mother's birth canal decreased, especially cervical open is likely to occur, most of the fetus is not influential.
Variable deceleration: the characteristics of fetal heart rate had no fixed relationship with uterine contraction. Once the variable deceleration, decreased rapidly and greatly reduced (more than 70bpm), for varying lengths of time, recovery is rapid. Variation reduction is generally considered to be the contraction of the uterus when the umbilical cord compression induced by the vagus nerve.
Late deceleration: the characteristics of the fetal heart rate decline starting point often backward to the increase of contraction curve starting point, in uterine contraction wave began, trough deceleration FHR curve backward on the crest of the contraction curve, time difference in 30-60 seconds, decreased less than that of the BPM, fetal heart rate response required for a long time. Late reduction is generally considered the performance of fetal hypoxia, the doctor will give high attention.
Uterine contraction
When about to give birth, contraction every 10 minutes less than 2 times, on behalf of the contraction is not enough; every 10 minutes more than 5 times or more, generally is that the contraction frequency is too high, the phenomenon of uterine hyperstimulation; expectant mothers every 10 minutes 3 times of contractions is normal.
Is a good helper, but not Wan Lingdan
In the fetal monitor the entire production process of the fetal heart rate can indeed make the life and health of the fetus more protection, but it is not a panacea. Fetal monitor result is normal, does not represent the fetus will be completely normal. For example, there are a lot of cerebral palsy children. The fetal heart sound display result is normal. Clinically, we occasionally encounter fetal monitor display fetal heart condition is good, production after the baby is not ideal situation; also used to because fetal monitor display fetal heart poor emergency implementation splits the palace production out of the child is crying loudly, no hypoxia condition.
