Functional status of the thyroid gland in complicated versus uncomplicated pregnancies

ABSTRACT

Many Adverse pregnancy outcome have been reported in pregnant women with thyroid dysfunction. The prevalence of thyroid dysfunction and its relation to pregnancy outcome had not been studied in our locality. To assess the magnitude of thyroid disorders during pregnancy and their relation to pregnancy outcome. A prospective clinical observational study. Subjects and One-hundred-fifty four, pregnant women attending the Ante-natal Care Unit, Mansoura University Hospital. Clinical examination was undertaken. Laboratory evaluation utilizing the highly sensitive chemiluminscent serum TSH assay was performed, together with estimation of serum total T3 and total T4. Cases with abnormal TSH levels were subjected to free T4 estimation to confirm the state of thyroid dysfunction. Urine examination, blood count, liver function tests, kidney function tests and plasma glucose were carried out. Thyroid and abdominal ultrasound were performed. The studied cases were classified into two groups; group 1; 12 women having different antenatal complications and group II; 42 women having no pregnancy complications. The studied cases were also grouped into rural and urban groups, according to their residence in villages or Mansoura town respectively No hyperthyroid cases were detected in either groups. The clinical manifestations of hypothyroidism were not fulfilled, but utilizing serum TSH and FT4 testing, forty five cases out of the 154 studied cases revealed subclincial hypothyroidism [29.2%] being significantly higher among the complicated pregnancy group [33.9%] than the non complicated group [16.7%] and significantly more frequent among the rural cases than the urban group [p<0.001]. Subclincial hypothyroidism has a tendency to increase with increasing gestational age. The most prevalent complications were severe preeclamptic toxemia in 73.7% and second trimester abortion in 15.8% of cases. Subclinical hypothyroidism is common, especially in rural localities. TSH screening of pregnant women in each trimester is suggested