Objectives: To assess the clinical particularities and management of Graves’ disease at the Medical Clinic II of the Abass Ndao Hospital Centre in Dakar. Patients and methods: This was a retrospective, descriptive study on records of patients monitored for Graves' disease from 1 January 2010 to 31 December 2014 (5 years). Socio-demographic, clinical treatment and changing parameters were evaluated. Outcomes: 878 patients were included and among them 542 had been monitored for at least 18 months. The sex ratio (M/F) was 0.2 and the average age was 34.8 ± 12 years. The average consultation period was 10.7 ± 2 months. Free T4 at diagnosis was > 80 pmol/l (36.6%). Prolonged medical treatment was reported in 96.7% of patients. The average dose for initial therapy with Carbimazole was 37 ± 9 mg/day. Beta-blockers were used in 64% and anxiolytics in 40.5% of cases. The average period for administering the maintenance dose was 5.6 months. Patients’ attendance and compliance stood at 17.7% and 53.1% respectively. Complications, mainly cardiothyreosis, were found in 13% of cases. Goitre regression was found in 13.9% of cases and that of exophthalmos stood at 19.5%. Among our patients, 38.2% were lost to follow-up. The remission rate was 36.5% and thyroidectomy involved 14.5% of patients. Only stage of goiter (p = 0.007) and initial free T4 value (p = 0.003) were statistically associated with remission. Conclusion: Graves’ disease management raises follow-up problems. Indeed, the medical treatment is long while the number of patients lost to follow-up is high. As the only radical alternative available is surgery, it is therefore essential to promote the development of radioactive iodine therapy to expand the therapeutic choice.
Graves’ disease is an autoimmune hyperthyroidism characterized by a thyrotoxicosis syndrome, vascular diffuse goitre, exophthalmos and presence of anti-TSH receptor antibodies. It is the most common cause of hyperthyroidism with frequencies ranging from 45% to 60% [
This was a retrospective, descriptive study conducted at the Medical Clinic II of the Abass Ndao Hospital Center of Dakar. It focused on records of patients monitored for Graves’ disease from 1 January 2010 to 31 December 2014 (5 years). All patients over 15 years old monitored for Graves’ disease, on the basis of a thyrotoxicosis table associated with one or more of the following signs, were included: exophthalmos acquired, vascular diffuse goitre and pretibial myxoedema. Thyrotoxicosis was confirmed by excess thyroid hormones (free T4 and free T3) or a decrease in the ultra-sensitive Thyroid-Stimulating Hormone (TSHus). Incomplete files (lack of assessment confirmation of hyperthyroidism, incomplete clinical data) were excluded from the final analysis. A pre-arranged sheet was used as the basis for data collection. It covered the following:
-Socio-demographic data: age, sex, marital status, history and comorbidities. To study the hyperthyroidism trigger or self-maintenance factors, the patients were grouped into three categories: category 1 (marital and/or social and family conflicts such as divorce, single mothers, celibacy, difficulties within the couple and/or family or in-laws); category 2 (economic, professional, educational difficulties); category 3 (psych emotional shocks such as death of a close relative, infertility, sentimental disappointment).
-Clinical data: signs of thyrotoxicosis and signs specific to Graves’ disease (goitre, exophthalmos, dermopathy). The classification of the World Health Organization, 1962, was used to classify goitre in stages. The associated pathologies were evaluated.
-Paraclinical data: values of thyroid hormones, ultra-sensitive TSH determined by immuno-radiological methods. Standards ranged from 0.17 to 4.05 mIU/l for TSHus, from 9 to 22 pmol/l for free T4 and from 2.5 to 5.8 pmol/l for free T3 were used. Cervical ultrasound, electrocardiogram and cardiac ultrasound were performed if required.
-Treatment data: the study of the medical treatment concerned the time limit for receiving appropriate care, prescription of drugs (synthetic anti thyroid drugs, beta-blockers and anxiolytics), dosage and treatment duration. The evaluation of surgical treatment focused on indications and the type of surgery.
-Evolution data: data on changes in patients who were monitored for at least 18 months. Complete remission was defined as a sustainable stabilization of the disease after 12 months of discontinuation of medical treat- ment. The complications that were investigated were cardiothyreosis, acute thyroid crisis and malignant exophthalmos.
For descriptive analysis purposes, data were presented in percentage for qualitative variables and in averages for quantitative variables. Chi-2 test were used for bivariate analysis and Fisher test for quantitative data. A p value < 0.05 was considered statistically significant with a confidence interval of 95%. Data were evaluated with Epi Info and SPSS 24.
878 cases were included. These were 709 women and 169 men, or a sex ratio (M/F) of 0.2. The average age was 34.8 ± 12 years (range of 16 - 83 years). The most affected age group was that of 31 - 59 years old with 55.1% of cases and subjects who were at least 60 years old accounted for 4.2% of cases. Married patients represented 52.8% of cases; a family thyroid dysfunction was found in 18.2% of cases. With regard to the trigger or self- maintenance factors, social and family and/or conjugal conflicts (category 1) predominated in 22.8% of cases followed by psycho emotional shocks (category 3) in 14.9% of cases. In 55.5% of cases, no specific psycho emotional situation had been described.
The average time for consultation was 10.7 ± 2 months. The patients seen in the first six months accounted for 46.8% of cases. Thyrotoxicosis signs are shown in
The average starting treatment dose with synthetic anti thyroid drugs (SAT) was 37 ± 9 mg/day of Carbimazole. This dose was 30 - 40 mg/day in 62.7% and more than 40 mg/day only in 25.5% of cases. Beta-blockers were prescribed in 64% and anxiolytics in 40.5% of cases.
Among our patients, 336 (38.2%) were lost to follow up. These were mainly women (95.4%), subjects aged 31 - 59 years (61.3%). The number of lost to follow-up was the highest one (11%) after the first consultation, then 10% after the first check of the 3rd month.
Among the 542 patients who were monitored for more than 18 months, the average duration of treatment of attack was 5.6 months. This duration was 3 months in 42.2% and 6 months in 25% of cases. In 56 patients (10.3%), the maintenance treatment could not be administered within 12 months of follow-up because of a lack of thyroid balance. Patients’ attendance was only 17.7% while their compliance stood at 53.1%.
The rate of free T4 achieved in the follow-up consultations was 95% while that of TSH us and blood count stood at 12% and 80%, respectively. The normalization of the free T4 stood at 31.1% in the 3rd month and 24.7% from the 6th month after the start of treatment with SAT. The average time until the occurrence of iatrogenic hypothyroidism was 15.6 months. The latter was found in 10% of patients in each quarterly check. Complete goitre regression was observed in 16.4% and that of exophthalmos in 11% of cases. Complications were found in 13.9% of cases. These were cardiothyreosis (11.9%) and malignant exophthalmos (1.1%).
Remission was achieved in 198 cases (36.5%). Only stage of goiter (p = 0.007) and initial free T4 value (p = 0.003) were statistically associated with remission.
Clinical signs | Number of patients (n = 878) | Percentage |
---|---|---|
Palpitation | 730 | 83.1% |
Weight loss | 702 | 79.9% |
Trembling | 610 | 69.4% |
Insomnia | 447 | 56.7% |
Thermophobia | 486 | 55.3% |
Asthenia | 471 | 53.6% |
Excessive perspiration | 440 | 50.1% |
Irritability and nervousness | 417 | 4.4% |
Sign of weakening of muscles | 255 | 29% |
Diarrhoea | 209 | 23.8% |
Polyuria and polydipsia | 172 | 19.5% |
Genito-sexual disorders | 121 | 1.3% |
Parameters studied | Patient in remission (n = 198) | p value | |
---|---|---|---|
Age groups (years) | (16 - 40) | 129 (65.2%) | 0.63 |
≥40 | 69 (34.8%) | ||
Sex | Female | 165 (83.4%) | 0.90 |
Male | 33 (16.6%) | ||
Stage of goiter | Stage 0 - 1 | 65 (32.8%) | 0.007* |
Stage 2 - 3 | 134 (67.2%) | ||
Exophthalmos | yes | 127 (64.2%) | 0.10 |
No | 71 (35.8%) | ||
SAT starting dose (mg/l) | <40 | 85 (42.9%) | 0.22 |
≥40 | 113 (57%) | ||
Initial free T4 Value (pmol/l) | <50 | 89 (45%) | 0.003* |
≥50 | 109 (55%) |
*Statistically significant link.
Seventy patients (14.5%) had received total thyroidectomy. The average age of patients was 34 years and among them, there were 52 women and 18 men. The indication for surgery was a recurrence in 37.1%, a medical treatment failure in 34.2%, a cardiothyreosis in 27.1% and a malignant exophthalmos in 1.4% of cases.
Graves’ disease turns out to be basically a predominantly female disease. In the literature a frequency of 7 - 10 women for one man is reported [
The more or less complete thyrotoxicosis syndrome was intense with a predominance of general, cardiovascular and neuropsychic signs. The frequency of associated signs such as goitre and exophthalmos is in line with the local data sets [
The therapeutic strategy is different depending on the school and continents. In our series 85.5% of patients were under medical treatment. The treatment of Graves’ disease in Africa and Europe is based on the medical option [
Our preference for SAT is linked to their availability, in the absence of treatment with radioactive iodine, and finally the lack of access to thyroidectomy [
Only 14.5% of our patients underwent surgery. Madieng et al. [
The regression of goitre was found in 16.4% cases, and that of exophthalmos in 11% of cases. The volume of goitre and presence of exophthalmos were correlated with a greater frequency of relapse in some series [
The TSH us was requested in only 12%. Yet its lowered rate is a predictive factor of relapse occurrence. It is the same for the increase in TSH receptor auto antibodies [
Approximately 35% of patients were lost to follow-up. Among the patients who reached the legal treatment duration, only 36% had a sustained remission. Our results are consistent with those reported of 32.7% in India [
The relapse rate was 28.4% in our series. Rates of 53.9% and 82.5% were reported by Lin et al. [
Limitation of our study was:
-It’s a retrospective study.
-Para clinical data like TSH receptor auto antibodies were not performed in patients because their cost is expensive.
Graves’ disease is a common disease in Senegal as evidenced by the number of cases compiled over five years. Socio-demographically, it remains a disease affecting young women and does not show any clinical feature except the severity of thyrotoxicosis and the significant volume of goitre associated with late treatment. Therapeutically prolonged medical treatment is the preferred option, but the number of patients lost to follow-up is significant and relapses are common. It is therefore essential to expand the indications for surgery but also to promote the development of treatment with radioactive iodine.
A. Sarr,D. Diédhiou,N. M. Ndour-Mbaye,D. Sow,I. M. Diallo,S. El Alaoui,M. Diouf,S. N. Diop, (2016) Graves’ Disease in Senegal: Clinical and Evolutionary Aspects. Open Journal of Internal Medicine,06,77-82. doi: 10.4236/ojim.2016.63013