Symptom >> Obstetrics and Gynecology >> Obstetrics

Sinusoidal fetal heart rate

Introduction
Cause
Examine
Diagnosis

Introduction

Introduction The fetus heart rate is sinusoidal Fetal Heart Rate (SFHR). The appearance of SFHR indicates that the fetus has serious danger and is a sign of fetal dying. The perinatal mortality rate is as high as 50%~75%. .

Cause

Cause

The pathophysiological mechanism of SFHR is not fully understood, but it is associated with fetal hypoxia and acidosis.

Examine

an examination

Related inspection

Fetal heart rate

Diagnostic criteria for SFHR:

(1) The fetal heart rate baseline was stable at 120~160 times/min, and the law fluctuated regularly.

(2) The amplitude is 5~15 times/min.

(3) Frequency 2~5 cycles/mino.

(4) Short-term variation is fixed or flat.

(5) The sinusoidal wave fluctuates above and below the baseline.

(6) There is no normal fetal heart rate variability or reaction.

(7) lasts for more than 10 minutes.

Diagnosis

Differential diagnosis

At present, the application of fetal heart rate monitor has become more popular. When the fetal heart is protected, it is found that there is abnormal fetal heart pattern, and it is often used to indicate abnormal fetal heart. 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 pregnant woman's own situation also affects fetal heart rate changes, such as pregnant women with fever, fetal heart rate often exceeds 160 beats / min, pregnant women have hyperthyroidism, her own heart rate is very fast, the fetal heart rate often exceeds 160 beats / min If pregnant women take certain drugs, such as salbutamol taken during preterm birth, or use atopine, it can cause heart rate in mothers and children to accelerate. Slow fetal heart rate may be caused by fetal hypoxia, but sometimes pregnant women take certain drugs, such as propranolol, the drug acts on the fetus through the placenta, causing the fetal heart rate to slow down. When the fetal heart rate continues to be slow, pay attention to check the possibility of congenital heart disease in the fetus. In addition, after more than 40 weeks of pregnancy, the fetal heart may sometimes be less than 120 times due to the development of the fetal nervous system. Points, so when there is abnormal fetal heart rate, you need to carefully analyze the situation and make correct judgments and treatments.