Fetal heart rate measurement – all norms in tables by week of pregnancy



Fetal heart rate measurement - all norms in tables by week of pregnancy For any future mother, happiness is to listen to the heart beating of her baby. And, of course, every mother knows that the normal heartbeat of the fetus is one of the main characteristics of a successful development of pregnancy and an indicator of the viability of crumbs. Therefore, the control of the heartbeat should be constant – throughout pregnancy.

What methods of measuring this indicator are used by specialists, and what are the norms of values?

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Table of the fetal heartbeat up to 14 weeks of pregnancy

  • Fetal heart rate for a period of 5-42 weeks
  • Methods for determining the fetal heart rate
  • How and why measure fetal heartbeat in childbirth?
  • Fetal bradycardia – causes
  • Fetal tachycardia – causes
  • Fetal heart rate table in early pregnancy to 14 weeks

    To assess the general condition of crumbs heart rate (note – heart rate) is an extremely important criterion, therefore it is measured every time a future mother visits a gynecologist.

    • The fetal heart appears at 4th week .
    • During this period, it is a hollow tube without partitions, which is able to shrink already at the 5th week of development .
    • And already to 9 weeks “tube” turns into a four-chamber organ.

    For the breath of crumbs in the heart remains an oval “window”, so that oxygen comes to the baby with the blood of the mother. After giving birth, this window is closed.

    In the early stages of hearing the knock of the heart of his child with a stethoscope is almost impossible. Heart rate up to 8-14 weeks doctor checks exclusively using modern diagnostic methods.

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    In particular, using ultrasound, which is performed with a transvaginal (from 5-6 weeks) or with a transabdominal sensor (from 6-7 weeks).

    HR rate table for early pregnancy:

    Pregnancy period

    Fetal heart rate (norm)

    5th week ​​

    80-103 beats / min.
    6th week ​​

    103-126 bpm.

    7th week ​​

    126-149 bpm.
    8th week ​​

    149-172 bpm.

    9th week ​​

    155-195 bpm.
    10th week ​​

    161-179 bpm.

    11th week ​​

    153-177 bpm.
    12th week ​​

    150-174 bpm.

    13th week ​​

    147-171 bpm.
    14th week ​​

    146-168 bpm. Of course, these indicators can not be considered an absolute and 100% sign of the absence of pathologies in the baby – in case of doubts in the correctness of development, always appoint additional studies.

    Fetal heart rate during gestation from 15 weeks to 42 weeks

    Since the 15th week, specialists check the heart rate using modern instruments.

    The norm of the fetal heart rate is:

    Pregnancy

    Fetal heart rate (normal)

    starting from the 33rd week

    140-160 beats / minute

    All values ​​ below 120 or above 160 – serious deviation from the norm. And with an increase in heart rate over 160 bpm, is spoken about the initial stage of hypoxia.

    And, the heart rate depends not only on the age of the baby, but also on its position, directly from the position in the uterus, from its movements, the nature of the mother’s abdominal tissue, etc.

    Methods for determining heart rate – with the help of what devices listen to the rhythm of the heart?

    • ultrasound (note – transabdominal / transvaginal). Using this procedure, check the presence of heart disease or other pathologies in future crumbs.
    • Echocardiography. The method is deeper and more serious, allowing to analyze the work of a small heart, its structure, and the functioning of blood vessels. Usually this method of diagnosis specialists appoint after the 18th and 28th week. For early and late terms the method is absolutely ineffective: in the 1st trimester the heart is too small and not fully formed, and at the end of pregnancy the diagnosis is hampered by a small amount of amniotic fluid. Usually echocardiography prescribes future mothers older than 38 years , or having certain diseases with which they automatically become a risk group. The method is recognized as the most accurate of the modern. In addition, it allows you to record a survey and even increase the resulting image for later detailed analysis.
    • Auscultation. Or, in simple terms, the use of an obstetric stethoscope. This procedure is carried out by future mothers at each reception at the doctor and during the delivery. Using a stethoscope, a specialist determines how the baby is inside the mother. With a clear listening to the heart beat below the mother’s navel, they talk about the headache, when they hit the navel – about the transverse, and when the heartbeats above the navel – about the pelvic. Also, the tool allows you to determine the nature of heart sounds and the rhythm of its contractions. Thanks to the method, the heart defect or hypoxia can be detected in a timely manner. The disadvantage of the method is in the absence of its effectiveness in case of many / hypoabrasion, in case of multiple pregnancy or obesity of the mother, and also when the placenta is located on the front / wall of the uterus.
    • Cardiotocography. Indications for this method of diagnosis are fever or severe gestosis, diabetes and prematurity, a scar on the uterus, hypoxia or aging of the placenta, hypertension, etc. The CTG method is used from the 32nd week and in the process of delivery: on the mother’s abdomen fix the sensors, and within an hour they record, according to the results of which the heart rate is assessed, as well as the reaction of the tones to the baby’s movements or fights. Fixed by the device heart rate less than 70 beats / min – an occasion to suspect an oxygen deficiency or a delay in the development of the fetus. However, with pelvic presentation this indicator is considered the norm.

    Fetal heart rate measurement - all norms in tables by week of pregnancy

    And how to listen to heart rate at home?

    Each mother would like to be at home listening to the beating of the heart of a future baby. And in some cases, you can not do without constant heart rate control.

    And it’s not necessary to go to your gynecologist for this – there are also home listening methods.

    • Obstetrical stethoscope. True, listen to it with the baby’s heart will be only after 21-25th week. And then – my mother will not be able to hear him, because it is impossible to carry out this procedure on his own – an assistant is needed.
    • Fetal Doppler. And here this ultrasonic device is very effective. It was created specifically for use at home after the 12th week of pregnancy. The device design resembles the KTG apparatus, but with one difference – other sizes and the lack of the ability to create records. Usually headphones are attached to it – for comfortable listening.

    How is it measured, and what does the fetal heartbeat show in childbirth?

    As we found out above, small deviations from the norm of heart rate indicators are not always a reason for panic and suspicion of fetal pathology.

    Again, the guarantees that “everything is fine”, the rate of heart rate also does not give.

    Why then need to listen to the heartbeat, and what does it give?

    • Establishment of the fact that the pregnancy has really come. For example, at the earliest date – from the third week, when the ultrasound becomes noticeable pulsation of the fetus.
    • Analysis of the development of the fetus. Diseases and stresses are known to accelerate or slow the heart rate. A heart muscle crumbs reacts to changes even faster. An analysis of her work allows you to draw conclusions about the health of the fetus as a whole.
    • Monitoring of the fetal condition during childbirth. Control of heart rate during labor is extremely important. Doctors should be sure that the baby is coping with the loads, so watch the fetal heart activity after each fight.

    In pregnancy of high-risk fetal condition, specialists are required to monitor heart rate during the entire delivery process – continuously .

    For example, when …

    1. Hypoxia and HNDR.
    2. Early or late childbirth.
    3. Gestosis or severe chronic illness of the mother.
    4. Stimulation of labor and use of epidural anesthesia.
    5. Multiple pregnancy.

    In addition to the obstetrical stethoscope, the KGT method is mainly used. He most accurately shows all the changes during childbirth and writes them on a paper tape.

    Fetal heart rate measurement - all norms in tables by week of pregnancy How is the research done?

    The future mother is attached to the abdomen with 2 special sensors: one examines the strength and duration of the fights, the other – the fetal heart rate. The sensors are fixed with a special tape and connected to the monitor to record the study.

    During the procedure, the mother usually lies on her left side or on her back.

    However, modern equipment is not so demanding.

    Fetal bradycardia – causes of rare heart beat

    It happens (usually in the 3rd trimester) that the fetal heart rate is not normal. The reason can be in external factors, and maybe in the development of pathology.

    One of the most common pathologies is bradycardia, in which the heart rate drops to extremely low values ​​- up to 110 beats / minute. and below.

    Also one of the signs of bradycardia is a decrease in the activity of a future baby, which is usually noted at KGT.

    The causes of bradycardia can be different.

    Of the main:

    • Unhealthy lifestyle of the future mother. That is, bad habits, abuse of harmful products, lack of proper diet, sedentary lifestyle.
    • Anemia and severe toxicosis.
    • Drivial and polyhydramnios .
    • Stress. Especially those that were transferred in the 1st trimester.
    • Taking medicines with toxic properties.
    • Congenital malformations of the baby.
    • Premature placental abruption.
    • Chronic diseases of the mother in the respiratory and cardiovascular systems.
    • Multiple pregnancy.
    • Rhesus-conflict in the absence of therapy.
    • Fetal accrual of umbilical cord.

    With the development of bradycardia, immediate intervention is required to eliminate or reduce the harmful effects.

    In the complex of therapeutic measures apply:

    1. Diet, strict regime of the day and rejection of bad habits.
    2. Observing the motor activity regime.
    3. Taking medications containing iron.
    4. Constant observation of the fetus.
    5. Therapy, whose goal is to eliminate exacerbation and symptoms. Fetal tachycardia – the causes of rapid heart beat

      If the heart rate is varied to 170-220 beats per minute . speak of tachycardia. This deviation is also a cause for alarm.

      The reasons can also be different.

      First of all, the reasons that directly depend on the lifestyle of the mother:

      • Stress and fatigue.
      • Smoking and taking medicines.
      • Abuse of tea, coffee.

      Also, fetal tachycardia can cause maternal health problems:

      • Changes in the hormonal composition of the blood and increase in the level of thyroid hormones.
      • Anemia that occurs due to deficiency of iron or vitamins.
      • The large loss of fluid that occurs after vomiting during the period of toxicosis.
      • Endocrine pathology.
      • Cardiovascular diseases.
      • Presence of trauma accompanied by blood loss.
      • Exacerbation of chronic infections.
      • Regular colds, bronchitis, etc.
      • Rheumatism at the stage of affection of the joints and heart.

      As for the causes of embryonic, they can be attributed to:

      • Multiparty mother.
      • Fetal anemia due to irregularly formed placenta.
      • Presence of intrauterine infection.
      • Rhesus-conflict with the blood of the mother.
      • Anomalies in the development of chromosomes.

      Diagnosis of tachycardia is performed with the help of ultrasound and dopplerography.

      Therapeutic activities include:

      1. Strict regime of the day, nutrition and activity.
      2. A certain diet that includes products with magnesium and potassium.
      3. Drug therapy, depending on the pathology, its causes, the form of tachycardia and the need for drugs.

      Usually, changes in the lifestyle of the mother are enough to make the fetal heart rate normal. But, of course, when revealing pathologies in a child, constant medical supervision is necessary, which is not always possible at home.

      All information in the article is given solely for educational purposes, it may not correspond to the specific circumstances of your health, and is not a medical recommendation. Site сolady.ru recalls that you should never delay or ignore the call to the doctor!

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