Services on Demand
On-line version ISSN 1518-8345
Rev. Latino-Am. Enfermagem vol.16 no.2 Ribeirão Preto Mar./Apr. 2008
Risk factors in patients with type 2 diabetes mellitus
Idalina Diair Regla CarolinoI; Carlos Alexandre Molena-FernandesII; Raquel Soares TascaIII; Sonia Silva MarconIV; Roberto Kenji Nakamura CumanIII
INutritionist, Master's student, Maringá State University, Brazil, e-mail: firstname.lastname@example.org
IIPhysical Education Faculty, M.Sc. in Health Sciences, Faculty of CESUMAR, e-mail: email@example.com
IIIPhD, Pharmacist, e-mail: firstname.lastname@example.org
IVPhD, RN, e-mail: email@example.com. Maringá State University, Brazil
This study was carried out to evaluate the risk factors of type 2 diabetic patients through sociodemographic data, habits of health, anthropometric and biochemist profiles, assisted at a basic public health care unit in Maringá, Paraná. Sixty-six patients, 56 women aged over than 50 years-old were interviewed. High prevalence factors for cardiovascular risk were observed, such as: overweight and obesity, hypertension, dyslipidemia, sedentariness and inadequate diet. Data suggested the need for multidisciplinary intervention programs in health care units associated to educative programs, adjusted diet intake and regular physical activity for these diabetic patients.
Descriptors: public health; risk factors; diabetes mellitus, type 2
Type 2 diabetes mellitus (DM2) is a chronic and frequent disease, whose prevalence has rapidly and continuously increased around the world in the last decades, acquiring epidemic characteristics in several countries, especially in developing countries. According to the Pan-American Health Organization (PAHO), there is an epidemic in course. In 1985, there were 30 million patients in the world; in 2000, 177 million cases were notified, a number that might increase to 370 million in 2030(2).
According to a multi-centric study on the Prevalence of Diabetes in Brazil, carried out in 1988, 7.6% of the adult population presents this health problem. In 2001, by the time of the National Campaign to Detect Suspect Cases of Diabetes in Brazil, when 20.7 million capillary glycemia tests were performed, 14.6% of suspicious exams were detected(3). In addition, official morbidity statistics appoint that DM2 is the fifth indication of hospitalization in Brazil and figures among the ten top causes of mortality in the country(4).
In view of these results, the great concern is how to face this situation in the different segments of society. Demographic aging and altered life styles are appointed as the main determinants of the sharp increase in the frequency of DM2 in the last years. Evidence regarding changes in life style, such as non-healthy eating habits and the lack of regular physical activities, associated to increased life expectancy in Brazil, have been indicated as factors responsible for the increased prevalence of DM2 in the country(5-6).
A recent report by the World Health Organization indicates an association between weight gain, abdominal obesity, sedentariness and the development of DM2, stressing eating habits as one of the main modifiable factors related to the development of non-transmissible chronic diseases(1).
A systematic literature review reveals that, although the influence of the genetic load in the development of the disease is arguable, prevention or retardation of its development among individuals who possess risk factors represents a relevant impact in the population's quality of life, besides the reduction of costs in public health care, caused by complications due the evolution of the disease(5).
In this sense, some studies have demonstrated that the control of weight, diet and increased physical activity diminishes resistance to insulin and consequently, the chances of developing DM2(7). Additionally, data from PAHO show this is a more efficient measure than the use of medication in primary DM2 prevention(1).
On the other hand, prospective studies, carried out in the United Kingdom (UKPDS)(8), with type 2 and type 1 diabetes patients (DCCT)(9), clearly show an association between hyperglycemia and the development of DM2 complications, also indicating that the treatment that reduces hyperglycemia, also reduces the risks of diabetic retinopathy, nephropathy and neuropathy.
Therefore, the reduction of modifiable risk factors such as weight, food consumption and physical activity showed significant potential to reduce the risk of developing DM2, even in individuals with a family history(10).
DM2 exerts great economic impact on nations. The cost by diabetic patient is mainly related to a high frequency of acute and chronic complications, which are causes of hospitalizations, disabilities, smaller labor productivity and premature death. In fact, an increasing number of hospitalizations has been observed in Brazil due to DM2 or associated diseases, proportionally higher than hospitalizations due to other causes(4). Reducing the impact of DM2 mainly means reducing the incidence of the disease, foreseeing its occurrence with preventive measures. However, too little is known about health conditions of Brazilians in cities of medium and small size.
Intervention studies on the prevention of diabetes in adult populations suggest that these programs are viable at basic health units(5) and enhance the population's health. There is evidence that, the earlier interventions occur, the more successful the modifications made in life style will be. Thus, studies that evaluate the profile of health service users can help in the prevention of diseases and lasting effects of DM2.
In this context, this study aimed to verify the risk factors of DM2 complications in patients using the Integrated Health Center (NIS II) Mandacaru, Maringá - Paraná, Brazil.
CASES AND METHODS
A descriptive and cross-sectional study was carried out at the Integrated Health Center NIS - II - Mandacaru, Maringá - PR, Brazil. Data collection was carried out in June and July, 2004. From a total of 200 subjects with DM2 registered at this Basic Health Unit, 66 patients were selected (10 males and 56 females) older than 50 years and with a diagnosis of DM2 established for five years or more. Patients were included by nurses from the Family Health Program.
A structured questionnaire was applied and addressed: a) patients' demographic and socioeconomic characteristics: age, gender, schooling, occupation and per capita income; b) eating habits: habitual diet record; c) physical activity: frequency and duration; d) clinical characteristics: pathological antecedents and personal clinical history; e) presence of habits harmful to health: use of tobacco and alcoholism; f) nutritional state and anthropometrical evaluation and, g) use of medication: frequency, quantity and type of medication.
The interviews were carried out by a team previously trained, composed by college graduated interviewers with previous experience in field work. The anthropometrical measures (weight, height and waist and hip circumferences) were performed twice and arithmetic means were computed from the obtained values.
In order to evaluate the nutritional state (overweight and obesity), patients were classified according to the obtained BMI, according to the World Health Organization's (WHO) recommendations, which define: under weight (BMI < 18.5Kg/m²), normal weight (BMI between 18.5 and 24.9 Kg/m²), overweight (BMI between 25 and 29.9 Kg/m²) and obesity (BMI >30 Kg/m²)(1).
The definition of central distribution of adiposity was based on waist and hip ratios (WHR), using threshold values of >0.85 and >0.95 for women and men, respectively. To characterize arterial hypertension, reference values according to recommendations by the Joint National Committee VII (JVC VII)(11) were used, in which the levels >90mmHg for diastolic and >140 mmHg for systolic indicate arterial hypertension. Patients who presented arterial blood pressure below these levels but reported the use of anti-hypertensive drugs were also considered hypertensive.
In order to characterize eating habits, a direct investigation of food consumption was performed through a 24-hour record, which is considered the ideal strategy to characterize diabetic patterns. Non-healthy diet was considered as low ingestion of fruits, fibers, greens and vegetables (less than two portions a day); and an elevated ingestion of saturated/trans fat with frequent use of fried food (more than four times a week), simple carbohydrates and sodium, soft drinks and processed foods(1).
All patients who informed non-participation in any kind of physical activity or performed physical activity for less than 20 minutes a day and less than three times a week were considered sedentary.
From the study population, 40 patients attended the Basic Health Unit to perform biochemical exams (lipid and glycemic profile), after fasting for 12 hours. Those individuals presenting seric levels of triglycerides and/or total cholesterol> 200 mg/dl, seric HDL-cholesterol < 45mg/dl, seric LDL-cholesterol > 100 mg/dl and triglycerides > 150 mg/dl(12) were considered dyslipidemic.
The medication used by the patients was classified in pharmacological classes according to the Anatomical-Therapeutical-Chemical Classification System (ATC)(13). In this classification, medication is categorized in different groups according to the organ or system they act in and by their chemical, therapeutic and pharmacological properties.
The results obtained were submitted to statistical analysis, using Epi-Info software (version 6.0). Data are presented in frequency and percentage form for qualitative variables and means and standard errors for continuous variables.
This study was approved by the Committee for Ethical Research with Human Beings of Maringá State University (report No 178/2004). Alphabetized participants signed the free and informed consent term, while illiterate participants were verbally clarified by the researchers about all study procedures, informing their consent through digital impression, according to the recommendations by the National Health Council, Resolution nº 196/96.
RESULTS AND DISCUSSION
This study evaluated 66 patients with DM2 followed by the Family Health Program (FHP) in Maringá, Paraná, Brazil. The demographic and socioeconomic characteristics of the patients studied indicate that the great majority is married (74.24%) and female (84.85%). Although these are very high numbers, they are in agreement with figures by the Health Ministry, that is, incidence and prevalence of DM2 1.4 to 1.8 times more higher in women(14). Additionally, women's systematic and continuous search for health care has been suggested to be one of the factors responsible for the predominance of the female gender in health services. Women, in comparison to men, usually take better care of themselves and are historically responsible for medical care of their families. Thus, they are more attentive to disease symptoms and generally seek help early. This is probably associated to the greater supply of health programs specific for the female gender.
There was only one patient older than 80 years, while the age range with the highest concentration of individuals was from 60 to 69 years old (51.51%), followed by 50 to 59 years (30.30%) and 70 to 79 years (16.67%). These findings are coherent with those found in other studies carried out with samples originating from health services(15). Such evidence can be justified by the fact that a higher frequency of DM2 occurs at approximately 60 years of age, and also that Brazilian people tend to seek medical care only at an advanced age.
The patients presented a low education level, 37.88% were illiterate, 30.30% studied until the fourth grade, 16.67% finished primary school and only 12.12% and 3.03% attended high school and college, respectively. Data obtained in Brazil in the last IBGE Census (2000)(16) revealed that 86.06% of the population in Maringá has been alphabetized. Among the patients in this study, 62.12% were alphabetized, which is lower than the city's mean level. However, it is important to stress that the population in this study is mostly composed of old people, and that most of the elderly have little formal education. In fact, in Brazil, the age range with the lowest alphabetization rates is over 60 years of age. When considering the country's old people in general, one has to bear in mind they come from a time when access to education was difficult.
Regarding per capita income, only one subject received more than three minimum salaries and 47 (71.22%) gain less than a minimum wage per month, indicating low purchasing power. The largest concentration of the population in Maringá receives between three and 20 minimum wages per month(16). This can be justified by the fact this is a mostly retired population (90.90%) with a low education level. For the Brazilian population, low education level is generally associated to poor socioeconomic conditions.
The prevalence of cardiovascular risk factors in the patients studied can be observed in Table 1. A great part (86.36%) of patients reported family antecedents of some type of chronic disease such as: DM2, hypertension, dislipedemia or coronariopathy.
Regarding the adoption of habits harmful to health, the use of alcohol was more frequent than tobacco. The frequency of these habits is much lower than findings from a recent survey carried out with a diabetic population (22 and 36.1%, respectively)(15). The values presented in the present study can be due to omission of this information at the moment of the interview, and also to the fact that the majority of the informants are elderly and female.
Regarding the anthropometrical variables, as observed in Table 1, the BMI values obtained appoint excessive weight in most patients (81.33%), 44% due to overweight and 37.33% to obesity, while 89.39% also present inadequate WHR. These results are similar to those found in a multi-centric study carried out with more than 2,500 DM2patients in 12 cities of different Brazilian regions(3). The high prevalence of overweight diabetic patients has been appointed by epidemiological research, estimating that between 80 and 90% of individuals with DM2 are obese or overweight(5). The prevalence of obesity in diabetic patients is three times higher than in the population in general, highlighting that higher prevalence of obesity is observed in patients in the South and Southeast(3).
However, despite awareness about the importance of excessive body weight for morbidity and mortality of patients with DM2, the control of this variable in diabetic populations has rarely been emphasized in most studies. In addition, the approach to this problem in basic health care has been neglected, since recommendations on the control of these variables exist in most services, but are not accompanied by resources that can adequately support individuals in an effective change that results in weight loss.
In the present study, 66.66% of patients were classified as hypertensive. A recent study showed that prevalence of hypertension varied between 15% and 47.8% in the South of Brazil(17). It is important to highlight that, among diabetic individuals, hypertension is twice more frequent when compared to the population in general and is present in about 50% of these patients at the moment of diagnosis. A study carried out in Rio Grande do Sul, Brazil, among type 2 diabetes patients, identified a prevalence of hypertension lower than that found in this study(17). This result can be justified by the older age of the participants in this study and also by the high prevalence of overweight and obesity.
Laboratory data indicate high prevalence of dyslipidemias (72.5%) in the patients evaluated, similar to that found in a survey with DM2 patients, performed in Rio Grande do Sul: 67% presented total cholesterol over 200mg/dL; 65% triglycerides > 150 mg/dL and 47% low HDL cholesterol(15). It is known that the two main components of diabetic dyslipidemia are the elevated levels of triglycerides and the low levels of HDL-cholesterol, both considered the main predictors of cardiovascular diseases.
The mean values of triglycerides and LDL cholesterol, observed in Table 2, were above those recommended by the American Diabetes Association (ADA)(12). ADA recommends, for diabetic patients, that HDL cholesterol values must be higher than 45 mg/dL; however, in this study, mean HDL was below this level (43.48 mg/dL). This study also presented mean values of LDL-cholesterol above recommendations (133.66 mg/dL) in the patients evaluated.
Such lipid profile, accompanied by the use of medication, strongly suggests inadequate diet and lack of physical activity. However, the need for a better control of lipid levels has to be considered, through a more effective and safe follow-up of the medications in use, which can even require dosage alteration, as well as the association of hypolipemiants(18).
Regarding alteration in the lipid profile, the unfavorable impact of dislipidemia on cardiovascular morbidity and mortality are largely acknowledged, as well as the frequent association of these conditions with diabetes(17). Moreover, a significant increase occurs in morbidity of individuals with types 1 and 2 diabetes mellitus in the presence of dyslipidemias. On the other hand, there is plenty of evidence that the treatment of dislipidemia has a favorable effect on the control of macro vascular disease in diabetic individuals.
It is important to highlight that a high number of individuals (72.5%) with acceptable levels of fasting glycemia was observed in this study, a fact that is justifiable by the use of medication. As observed in Table 3, all patients used anti-diabetic drugs, 65.15% oral hypoglycemiants and 34.85% insulin.
However, these patients did not present adequate control of other parameters such as: arterial pressure and seric levels of lipids, which are relevant to diminish the risk of macrovascular complications of diabetes, responsible for 65% of mortality causes in this population(17). In fact, according to ADA(12), antihypertensive and antidyslipidemic treatments are extremely important for diabetic patients and reduce morbidity and mortality in this population. In this context, pharmacological measures associated to changes in life style are essential in the initial treatment of the diabetic patient(12). In this study, it was observed that only 18.18% and 12.12% of patients used antihypertensive and hypolipemiants, respectively. In addition, the lack of regular physical activity (66.66%) and non-healthy diet (69.69%) were observed in a high number of patients.
According to ADA recommendations, therapeutic intervention through regular physical exercise and a healthy diet is essential during the patient's follow-up, towards the prevention and control of cardiovascular diseases(12). In this study, a higher prevalence of sedentary patients and non-healthy eating habits was observed. Thus, changes in life style, controlled diet and regular physical activity are important for the reduction of risk factors in these patients.
Regarding non-healthy diets, parameters of consumption of saturated/trans fat, sodium and simple carbohydrates were considered for this evaluation. Known as "western diet", this diet is characterized by a high ingestion of red meat, integral dairy products, sweetened drinks, sugar and desserts, with reduced consumption of fruits, greens and vegetables, which is directly related to the risk of developing and/or causing micro and macro vascular complications of diabetes(15).
The characterization of patients in this study, attended at a basic health unit in Maringá - Paraná, Brazil showed high prevalence of risk factors concomitant with DM2. These results appoint that the reduction of body weight, control of arterial hypertension and dyslipedimia must be considered in the treatment of DM2 patients at basic health units, especially adopting conservative measures, such as healthy diet and regular physical activity. The Brazilian Single Health System and health professionals must be capable and motivated to perform the interventions needed to improve the population's quality of life, working towards the reduction of risk factors and, consequently, of non-transmissible chronic diseases.
More epidemiological studies on the profile of DM2patients are important in Brazil, so that more efficacious interventions can be planned, especially at the regional level.
The organization and systematization of services for specific population groups, based on the population's epidemiological profile, are difficult because of generalized population indicators. In the case of care delivery by the public service, which is based on spontaneous demand, this does not always reflect the needs of the population, for instance, for diabetic and/or hypertensive people attended at Basic Health Units (UBS) in Maringá.
Therefore, the use of information is essential and strategic in the health area in order to support plans and projects administered by the city management. The adoption of preventive and therapeutic measures regarding risk factors in type 2 diabetes is an emergent need in primary health care of this city. The implementation of multidisciplinary programs at all care levels for diabetic patients and epidemiological studies on the profile and characterization of individuals must be promoted, so that more effective interventions can be planned.
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Recebido em: 7.3.2007
Aprovado em: 14.1.2008