Pulse rate in pregnant women
The pulse is determined by the oscillation of the arterial wall against the background of cardiac contractions. The average pulse rate is 72 beats per minute, while the limits of the acceptable range are determined from 60 to 100 beats per minute. Some people (most often athletes) have a physiological bradycardia when the pulse is 40-50 beats / min. This is also a variant of the norm, since a person has a well developed cardiac muscle, which, although less often, is more contracted.
At pregnancy the pulse on the contrary rises, because the process of bearing a child is associated with many changes in the body of a woman. Some of them concern her cardiovascular system.
Pulse is determined without much difficulty. For this it is enough to put two or three fingers of the right hand (except the thumb) on the inside of the wrist of the left. Pressing a little, you can feel the tremors under the fingers, the number of which is considered for 60 seconds. If necessary, you can conduct a similar study on your right arm and compare the results. Normally, they should not be very different.
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Features of hemodynamics in pregnant women
- To ensure the normal development of the fetus, the heart of a woman must work hard, because when a child grows, it is necessary to pump more blood into the uterus.
- In the third trimester of pregnancy, a fifth of the blood passes through the uterus from the woman's total blood flow.
- It is noted that in pregnant women the amount of blood pumped by the heart (cardiac output) increases from the initial volume by 30-50%.
- As the cardiac output increases, the heart rate at rest also becomes larger relative to the normal value.
- At 30 weeks of gestation, the cardiac output decreases slightly, then it increases by 30% with delivery.
- After delivery, the heartbeat is first quickly reduced, and then this process slows down.
- Normalization of the pulse to the usual indicators occurs approximately 6 weeks after childbirth.
Some heart murmurs and a heart rhythm disorder may appear because the heart is working harder. Sometimes a pregnant woman can feel these disorders. Such changes are normal during pregnancy. However, other abnormal heart sounds and rhythms (eg, diastolic noises and fast, irregular heart rhythms) that are more common in pregnant women may require treatment.
Arterial blood pressure, as a rule, decreases in the second trimester, while in the third one it can return to the usual indicators.
Pregnant women have an increase in blood volume by approximately 50%. The amount of fluid in the blood increases more than the number of red blood cells carrying oxygen. Thus, despite the fact that there are more blood in the body of the pregnant woman, laboratory tests show moderate anemia, which is normal. For unknown reasons, the number of leukocytes (which eliminate viral and infectious agents) increases slightly during pregnancy and increases markedly during labor and during the first few days after childbirth.
The large size of the uterus interferes with the return of blood from the legs and the pelvic region to the heart. As a result, edema is observed, especially in the ankle region. Varicose veins usually develop on the legs and in the area of the vaginal opening (vulva). Such changes sometimes cause discomfort.
Normal heart rate during pregnancy
The normal value of the pulse during pregnancy depends on several factors. First of all, this refers to the age of the woman in the position, the level of her activity, and the state of her health, which should have been assessed before her pregnancy.
In a state of rest, the pulse in a pregnant woman is determined on the average at the level of 80-90 beats per minute. If twins are expected or if this is a second pregnancy, the blood flow will be more intense, which leads to a significant acceleration of the heart rate. In the last trimester of pregnancy, the pulse most often increases by 10-20 beats / min.
Danger of frequent heartbeat during pregnancy
During pregnancy, the pulse often increases on the background of performing physical exercises. In some cases, even when lying on the back of a pregnant woman, a frequent pulse is detected. This is associated with an increased body weight, which leads to additional stress on the heart and blood vessels.
If the future mother has significant hormonal changes or a lack of trace elements, this can contribute to tachycardia, as well as anemia or hypotension. Very often there is tachycardia during pregnancy, along with a low level of pressure.Acceleration of cardiac contractions during pregnancy can always be observed against the backdrop of certain diseases or even unhealthy lifestyles.
It is important to understand that pregnancy is accompanied by a change in the sensitivity of the female body, often expressed in a decrease in tolerance to foods that previously did not cause any problems. As a result, the previously familiar substances in the period of gestation can cause damage to the body (both mother and child). In addition, a pregnant woman should be extremely careful with medicines that at first sight seem harmless. For example, various drugs in the form of a spray from rhinitis can trigger the acceleration of the pulse during pregnancy due to spasm of blood vessels.
Can a slow pulse be the norm in pregnancy?
During pregnancy, there may be a decrease in heart rate, that is, below 60 beats / min. Such a condition in medicine is defined by the term "bradycardia". As a rule, a woman does not experience any unpleasant sensations. But sometimes a slowed down pulse causes syncope and dizziness, in addition, low blood pressure may be observed.
Bradycardia in pregnant women is rare, but it is still necessary to remember that this condition can lead to certain heart diseases. Therefore, if the future mother has noticed this condition, you need to inform the doctor about it. It should be noted that a slight slowing of the heart rate does not adversely affect the general health of the future mother, and also poses no danger to the child.
When the pulse rate goes into pathology?
Each pregnant woman needs to understand exactly when the accelerated pulse is normal, and in which case it indicates the development of a pathological condition. Quite often a pregnant woman has enough to calm down, so that the heart rate will return to normal. For this, you can simply lie down and relax a bit.
If, in addition to the accelerated heart rhythm, a woman in the situation has such complaints as weakness, nausea, dizziness, lack of air, then you should immediately go to the doctor.
In addition, consult a doctor before long trips or the beginning of any exercise program during pregnancy. Depending on the state of health of the mother and the child, the physician may impose restrictions on physical activity or reduce the level of exercise.
Video Tachycardia in Pregnancy