Fetal bradycardia

Introduction Fetal bradycardia is called when the fetal heart rate is less than 120 beats per minute. When the first measurement is less than 120 times/min, the subject is allowed to rest for 10 minutes and then measured. If it is still less than 120 times/min, a diagnosis can be made, and attention should be paid to the relationship with the contraction. The fetal heart rate is below 70-80 beats/min. There may be atrioventricular block when there is no fetal distress and no other fetal distress symptoms.

Cause

Fetal bradycardia is seen in paroxysmal sinus bradycardia (enhanced vagal tone), persistent sinus bradycardia (sinus ganglion dysfunction, maternal hypothermia, long QT syndrome), 2 or 3 degree atrioventricular block In addition, it is common in atrial premature beats. The fetal heart rate is below 120 bpm. Mild 120-100 bpm, severe <100 bpm. Complete atrioventricular block, ventricular rate 40-80bpm, M-over indicates atrial rate is normal and ventricular rate is slow, mostly accompanied by fetal heart failure, may be associated with congenital heart disease, accompanied by congenital 3 degree atrioventricular block Poor fetal prognosis. Sinus bradycardia should consider factors outside the fetal heart, such as fetal hypoxia, fetal head compression, excessive intrauterine pressure can cause bradycardia.

an examination

Related inspection

Oxytocin stimulation test Doppler echocardiography fetal heart rate monitoring uterine stimulation test fetal heart sound

Fetal bradycardia is seen in paroxysmal sinus bradycardia (enhanced vagal tone), persistent sinus bradycardia (sinus ganglion dysfunction, maternal hypothermia, long QT syndrome), 2 or 3 degree atrioventricular block In addition, it is common in atrial premature beats. The fetal heart rate is below 120 bpm. Mild 120-100 bpm, severe <100 bpm. Complete atrioventricular block, ventricular rate 40-80bpm, M-over indicates atrial rate is normal and ventricular rate is slow, mostly accompanied by fetal heart failure, may be associated with congenital heart disease, accompanied by congenital 3 degree atrioventricular block Poor fetal prognosis. Sinus bradycardia should consider factors outside the fetal heart, such as fetal hypoxia, fetal head compression, excessive intrauterine pressure can cause bradycardia.

In addition to the normal color Doppler ultrasound, you should go to the hospital to do a fetal echocardiogram to see if there is any problem with the heart of the fetus.

If you are born, check your child's echocardiogram. After birth, you can give your child a dynamic ECG test, and you can also check the myocardial enzyme spectrum.

Differential diagnosis

It needs to be distinguished from the following symptoms:

Changes in fetal heart rate: fetal heart rate, which is the regulation of fetal heart rate by sympathetic and parasympathetic nerves. The curve of the monitoring pattern formed by the instantaneous fetal heart rate changes can be used to understand the fetal heart reaction during fetal movement and contractions. It is speculated that there is no hypoxia in the intrauterine fetus. Abnormal fetal heart rate in most cases means that the fetus has hypoxia in the uterus. The more severe the abnormal fetal heart rate, the more severe the fetal hypoxia is, but not all fetal heart abnormalities are caused by hypoxia. In addition, the condition of the pregnant woman itself also affects the changes in the fetal heart, such as a fever in pregnant women.

Intrauterine asphyxia: Intrauterine asphyxia refers to the lack of oxygen in the uterus or excessive gas or respiratory disorders, and difficulty breathing or even stopping breathing.

Sinus fetal heart rate: Fetal heart rate is sinusoidal Fetal Heart Rate (SFHR). Many authors believe that the appearance of SFHR indicates that the fetus has serious danger and is a sign of fetal dying. The mortality rate of infants is as high as 50% to 75%.

Fetal bradycardia is seen in paroxysmal sinus bradycardia (enhanced vagal tone), persistent sinus bradycardia (sinus ganglion dysfunction, maternal hypothermia, long QT syndrome), 2 or 3 degree atrioventricular block In addition, it is common in atrial premature beats. The fetal heart rate is below 120 bpm. Mild 120-100 bpm, severe <100 bpm. Complete atrioventricular block, ventricular rate 40-80bpm, M-over indicates atrial rate is normal and ventricular rate is slow, mostly accompanied by fetal heart failure, may be associated with congenital heart disease, accompanied by congenital 3 degree atrioventricular block Poor fetal prognosis. Sinus bradycardia should consider factors outside the fetal heart, such as fetal hypoxia, fetal head compression, excessive intrauterine pressure can cause bradycardia.

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