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Gestational diabetes and its influence on the quality of life of pregnant women

Magdalena Humaj-Grysztar
,
Marcelina Wojsa
,
Julia Nawrot
,
Patrycja Ostrogórska
,
Dorota Matuszyk

Data publikacji online: 2018/11/13
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INTRODUCTION

Diabetes is a chronic disease that is considered as a civilisational and social one. It involves numerous complica-tions. As a result, a diabetic patient’s quality of life should be perceived from a wide perspective. Diabetes is also the most frequently occurring metabolic complication of endocrinological nature occurring during pregnancy. In Europe, gestational diabetes occurs in between 3 and 5% of pregnant women [1]. According to the Polish Diabetological Associ-ation, diabetes appearing in the course of pregnancy is divided into: hyperglycemia diagnosed for the first time during pregnancy and diabetes preceding pregnancy (pregestational diabetes mellitus – PGDM). Both diabetes during preg-nancy and gestational diabetes mean an impaired glucose tolerance of various degree diagnosed for the first time dur-ing pregnancy [2]. Diabetes during pregnancy is diagnosed when fasting glycaemia is ≥ 7.0 mmol/l (126 mg/dl) or in case of abnormal OGTT result (at 2 hours 75 g OGTT ≥ 11.1 mmol/l) or when random blood glucose level is ≥ 11.1 mmol/l (200 mg/dl) and it is associated with clinical symptoms of hyperglycemia [3].
The criterion for diagnosing gestational diabetes is at least one abnormal result out of three of the following plasma glucose tests with 75 g glucose (OGTT):
• fasting 92-125 mg/dl (5.1-6.9 mmol/l),
• at 60 minutes ≥ 180 mg/dl (≥ 10.0 mmol/l),
• at 120 minutes 153-199 mg/dl (85-11.0 mmol/l) [3].
We differentiate between two types of diabetes: in G1 gestational diabetes women must adhere to diabetic diet therapy in order to keep a normal blood sugar level, while in G2 gestational diabetes both following diabetic diet and insulin therapy are necessary [4]. Pregestational diabetes is defined as a disorder affecting pregnant women in whom the disease was diagnosed before pregnancy. It may be type 1 or 2, MODY or any other kind of diabetes [4-6].
In accordance with the guidelines of the Polish Diabetological Association (2017 guidelines), the risk factors for developing hyperglycemia in pregnancy include the follwing [3]:
• pluriparity,
• pregnancy after 35 years of age,
• delivering a newborn with a birth defect,
• history of intrauterine deaths,
• history of delivering heavy babies (> 4000 g),
• hypertension,
• being overweight or obese,
• family history of type 2 diabetes,
• gestational diabetes diagnosed during previous pregnancies,
• polycystic ovarian syndrome.
The Polish Diabetological Association’s recommendations of 2017 [3] define the criteria for the diagnosis and classification of hyperglycemia diagnosed for the first time during pregnancy. All pregnant women should be screened for glucose tolerance impairment and the initial determination of fasting glucose should be performed during the first visit to the gynaecologist during the first trimester of pregnancy. In pregnant women at risk, 75 g Oral Glucose Tolerance Test (OGTT) should be performed then. The normal result of the initial fasting glucose test is < 92 mg/dl.
In cases when the level of glucose:
• amounts to 92-125 mg/dl – 75 g OGTT should be performed urgently,
• exceeds 125 mg/dl – fasting glucose test should be repeated urgently.
When the result of repeated fasting glucose test is abnormal, the patient should be referred to a centre treating diabetic complications in pregnancy [3]. Random fasting glycemia in the first trimester exceeding 92 but below 125 mg/dl does not constitute a basis for the diagnosis of gestational diabetes [3]. Di¬agnosis with the use of OGTT should be performed in all pregnant women between 24th and 28th week of pregnancy [3, 7]. Oral load of 75 g glucose is used, dissolved in 250-300 ml of water and drunk within 5 minutes. In the case of abnormal result, the obstetrician together with a diabetologist should determine the course of treatment, aiming at preventing complications in the mother and the foetus [8].
Integrated and multidisciplinary approach is necessary in the care of diabetic pregnant woman. What is im-portant is education, carried out by a midwife or a nurse from a diabetology clinic, concerning the clinical issues, the technical aspects of managing the insulin pump, the administration of medicines and independent glycemia testing. Also, education concerning physical activity and breastfeeding is an important aspect here [3]. In the course of diabe-tes, strict adherence to dietary recommendations, and regular independent monitoring of glycemia are necessary. Max-imum glycemia within 1 hour after starting a meal should be below 140 mg/dl (< 7.8 mmol/l) and the target values of self-control while fasting should range between 70 and 90 mg/dl (3.9-5.0 mmol/l) [3]. What is also significant is the evaluation of the pregnant woman’s assessment of the quality of life because it indicates the effects of using various medical procedures [9]. It is the state of health, in combination with other domains, such as mental and emotional health or social functioning, which comprise the subjective assessment of a patient’s quality of life [9, 10].

AIM OF THE STUDY

The aim of the study was to learn about the subjective assessment of the quality of life by women with gestational diabetes treated with diet and diet combined with insulin, as well as the factors affecting it.

MATERIAL AND METHODS

The study was conducted in the Department of Obstetrics and Perinatology of the University Hospital in Kraków and in the Diabetology Clinic for Pregnant Women at the Department of Metabolic Diseases of the University Hospital in Kraków, on 99 pregnant women in whom gestational diabetes was diagnosed in the period between January and March 2016. Following the initial analysis of the questionnaires, only 87 of them were used in the study. The remaining questionnaires were rejected due to the incompleteness of the answers provided by the patients. In the studied group, 40 women were treated with diet and insulin while 47 used dietary treatment. The study fulfilled the requirements of the Declaration of Helsinki. The participation was voluntary and the respondents had been informed about its anonymity and the possibility to resign at any stage of its course.
In the study, the method of the diagnostic survey with a questionnaire were employed. Two questionnaires were the tools of the study. Standardised questionnaire for the quality of life SF-36v2 (Quality of life SF-36v2) was used, for which the permission was obtained from Optum company from the USA (licence number: QM031593), as well as the author’s questionnaire.
SF-36v2 questionnaire consists of 11 questions with a total of 36 statements that enable the assessment of eight dimensions of the quality of life, such as PF – Physical functioning, RP – Role limitations due to physical health problems, BP – Body pain, GH – General health perception, RE – Role limitations due to emotional problems, SF – Social functioning, MH – General mental health and VT – Vitality. Dimensions of life quality are attributed to two scales: physical (PCS – Physical Component Summary) which includes PF, RP, BP and GH, and mental (MCS – Mental Component Summary) which comprises RE, SF, MH and VT. The results obtained in terms of PF, RP, BP, GH, RE, SF, VT, MH are demonstrated in the scale 0-100, where the higher the result, the better the assessment of life quality in a given dimension. The norm-based scale is used to assess results in physical and mental spheres, in which the norm is determined by any result equalling 50. The value below 50 means worse quality of life associated with health and a higher result denotes a better quality of life [9, 10].
The author’s questionnaire consisted of 27 questions concerning, among others, socio-demographic data, the course of the present pregnancy, obstetric history, the pregnant woman’s diseases, cases of diabetes in the family and treating gestational diabetes.
The Health Outcomes Scoring Software 4.5 was used to analyse the data from the SF-36v2 questionnaire. The data collected were entered into the Microsoft Office Excel 2010 data sheet. Statistica 12 was then used for statistical analysis. The values of arithmetic mean, standard deviation, median, minimum and maximum were calculated. In order to assess the differences between the groups, the nonparametric Mann-Whitney U test was used. The relationship between selected variables and the dimensions of quality of life was tested by means of Spearman’s rank correlation. α = 0.05 was accepted as the level of significance of differences between the groups tested.

RESULTS

The average age of women in both groups was similar and amounted to about 30.97 ±3.47 years in the group of pregnant women treated with insulin and 30.62 ±4.73 years among subjects treated with diet only. Most of the preg-nant women were married (81.61%, n = 71) and had received higher-education (66.67%, n = 58). The largest group of respondents lived in cities of a population of more than 100 thousand (42.53%, n = 37).
15% (n = 6) of women treated with insulin and 38.3% (n = 18) of women treated with diet were pregnant for the first time. In the group of pregnant women treated with insulin, gestational diabetes occurred in the previous pregnancy in 30% (n = 12) of the respondents. 40% (n = 16) of them experienced at least one miscarriage and 42.5% (n = 17) de-livered a baby whose weight exceeded 4000 g, which was about twice as much as in the case of women treated with diet only (14.89%, n = 7; 23.4%, n = 11 and 19.4%, n = 12; Table 1).
The women studied were characterised by a very high level of self-discipline and diabetes monitoring. In the group treated with insulin, all the respondents (100%, n = 40) adhered to the diet and kept a self-control diary. Almost all of them measured their glycemia at least twice a day (97.5%, n = 39). Among the women treated with diet, only two did not follow the diet and did not keep self-control diary (4.26%) while one did not make glycemia measurements (2.13%; Table 1).
Women taking insulin had greater average body weight (72.73 kg, p = 0.0280) and greater BMI before preg-nancy (26.72 kg/m2, p = 0.0041). They also more frequently had abnormal body weight (62.5%, n = 25) in comparison with those treated with diet (65.09 kg, 23.8 kg/m2 and 42.55%, n = 20) during pregnancy.
Women treated with diet obtained statistically significant higher average result with respect to the dimension of social functioning factor (SF = 69.15) in comparison with those treated with insulin (SF = 53.75). The remaining differ-ences between the groups were not statistically significant. In both groups, limitations arising out of RE emotional prob-lems turned out to be the best assessed dimension of life quality (73.96 in the group taking insulin, 79.61 in the group treated with diet only). Limitations caused by problems with physical health, in turn, were the area of life quality that had the lowest evaluation by respondents taking insulin (RP = 43.13) and by respondents treated with a diet only (RP = 54.12), but the average result in the group of pregnant women who took insulin was lower by 10.99 (Table 2).
In the subsequent part of the analysis, it was checked whether such variables as age, education, BMI value from before pregnancy and the increase in body weight during pregnancy influenced the results of particular elements of the SF-36v2 questionnaire. It was demonstrated that younger women taking insulin exhibited better physical func-tioning PF (R = –0.42, p = 0.0076) and the general results on the physical condition scale PCS (R= –0.34, p = 0.0333). Younger pregnant women treated with diet only had higher results in the general mental condition scale MCS (R = –0.31, p = 0.0347; Table 3).
In the group of pregnant women taking insulin, numerous correlations were found between the dimensions of the quality of life and the level of education. Higher level of education in women treated with diet resulted in greater limitations in fulfilling roles, resulting from emotional problems RE (R = –0.33, p = 0.0216), while in the group of preg-nant women taking insulin the situation was the opposite (R = 0.42, p = 0.0066; Table 4).
In the group of respondents who were treated with diet only it was proven that those with a higher BMI before pregnancy were characterised by lesser pain complaints BP (R = 0.36, p = 0.0120), better social functioning SF (R = 0.61, p ≤ 0.0001) and lower limitation in performing roles resulting from emotional problems RE (R = 0.61, p ≤ 0,0001; Table 5).
Weight gain during pregnancy, in turn, correlated negatively with physical functioning PF (R = –0.31, p = 0.0322) and limitations in performing roles due to physical health (Role-Physical) RP (R = –0.33, p = 0.0258) in the group of pregnant women treated with diet and physical functioning PF (R = –0.31, p = 0.0493) in women taking insulin (Table 6).

DISCUSSION

The analysis of individual components of the SF-36v2 form in both examined groups did not show statistically sig-nificant differences between any single health quality dimension except for social functioning SF. The pregnant women treated with diet obtained statistically significant higher quality of life in comparison to those taking insulin (p = 0.004). This may mean that the need of taking additional insulin affects the lower quality of life in terms of social functioning. Bień et al. came to similar conclusions in their study. The researcher showed that women with gestational diabetes treated with diet assessed their quality of life higher than did those taking insulin [11]. This is confirmed by the study of Kutowska et al., who determined the deterioration of the quality of life of pregnant women following the diagnosis of gestational diabetes and the initiation of insulin therapy [12]. The lowest values of life quality in both groups were not-ed in the category of limitation due to physical health RP, where the average value in the group of pregnant women treated with insulin was lower and amounted to 43.13. The examined pregnant women from both groups assessed the RE dimension at the highest level, the average value for women taking insulin was 73.96 and for those treated with diet only 79.61. This means that women suffering from gestational diabetes did not experience emotional problems in their daily functioning, irrespective of the treatment used. The average results on the overall physical condition scale of PCS and mental condition scale MCS were below normal in both groups; the differences were not statistically significant. These results coincide with the results obtained by Truntovsky et al. who demonstrated in their study that the general evaluation of the quality of life of women with gestational diabetes decreased with progress in pregnancy, regardless of the kind of treatment used [13]. In the study carried out by Dalfrà et al., respondents with gestational diabetes noted lower results in the dimension of general health perception GH and higher results in the physical scale PCS in compari-son to the group of pregnant women [14]. Kim et al. came to other conclusions on the influence of gestational diabetes on the quality of life. They proved the absence of significant influence of the disease on the deterioration in women’s life quality [15]. Similar results were also obtained by Halkoaho et al. who did not prove the impact of gestational dia-betes in the examined women on the decrease of life quality as perceived by them [16].
Our own research analysed the influence of age, education, BMI from the pre-pregnancy period and weight gain during pregnancy on the assessed quality of life. It was demonstrated that age negatively correlated with physical functioning PF and the results on the overall physical condition scale PCS in women treated with insulin, which is con-firmed by the studies by Glasgow et al. [17]. Majda et al. came to similar conclusions in their study. When assessing their quality of life by means of WHOQOL-Bref Life Quality Questionnaire, younger women with gestational diabetes obtained higher results in the psychological sphere as well as in the social one [18].
In the studies of Nowakowska-Głąb and Maniecka-Bryła, statistically significant differences were found be-tween the assessment of the quality of life of pregnant women and their level of education. Respondents with higher education obtained higher results in indicators of perceived mental health MH and their perceived general health GH [19]. We found confirmation of this in our own research, in which we demonstrated that the level of education corre-lates positively with the sense of mental health MH (R = 0.38, p = 0.0163).
When analysing the impact of BMI from the pre-pregnancy period on the assessment of the quality of life, it was determined that it correlated positively with some indicators, which suggests that women with a higher BMI were characterised by a better quality of life. In turn, weight gain during pregnancy negatively correlated with such indicators as physical functioning PF, limitation in performing roles due to physical health issues (Role-Physical) RP and the re-sults obtained on the overall physical condition scale PCS in pregnant women treated with diet and with physical func-tioning PF in the respondents taking insulin. This means that lower weight gain during pregnancy was conducive to bet-ter assessment of the quality of life.

CONCLUSIONS

1. The subjective assessment of the quality of life of the pregnant women with gestational diabetes was good.
2. The use of insulin in the treatment of gestational diabetes may have an influence on lower subjective evalua-tion of the quality of life.
3. The kind of therapy of gestational diabetes has the greatest influence on the social functioning SF, pregnant women treated with diet only evaluate better this dimension of life quality.
4. Sociodemographic factors such as age, education, pre-pregnancy BMI value and weight gain during pregnan-cy had an impact on the results obtained by the respondents in particular dimensions of the quality of life.
5. Medical staff should take special care of women with gestational diabetes treated with insulin due to the nega-tive influence of the applied method of treatment on quality of life.

Disclosure

The authors declare no conflict of interest.

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