Initial Therapeutic Choices for Type 2 Diabetes in the Portuguese Sentinel Practice Network

Acta Med Port. 2019 May 31;32(5):375-380. doi: 10.20344/amp.10414. Epub 2019 May 31.

Abstract

Introduction: Type 2 diabetes is a major driver of pharmaceutical spending. We aimed to determine the proportion of new patients who begin treatment with each antidiabetic medicine class, if therapy was initiated by their family physician, if family physicians alter prescriptions initiated by other physicians, and to compare prescribing patterns of family physicians and other specialists.

Material and methods: Cohort-nested cross-sectional study within the Portuguese Sentinel Practice Network. Between 2014 and 2015, incident cases of type 2 diabetes were notified, thus reporting treatment, who made the initial prescription and if treatments initiated by other physicians were changed.

Results: A total of 415 incident cases were notified. The initial prescription was made by Sentinel Practice Network physicians in 89.4% of cases (95% CI 86.0% - 92.0%). Metformin was most often chosen as the first treatment, prescribed to 85.5% of patients (95% CI 81.8% - 88.6%). Family physicians used less dipeptidyl peptidase-4 inhibitors (4.2% vs 30.3%, p < 0.001) and insulin (0.3% vs 12.1%, p < 0.001) compared to other specialists. Prescriptions initiated by others were changed in 4.5% of cases (95% CI 0.4% - 16.0%).

Discussion: Prospective data collection is a major study strength, but few cases of treatment initiated by non-family physicians were notified. Data for disease severity was unavailable and could partly explain differences between family physicians and other specialists.

Conclusion: Metformin was most often chosen as initial therapy, in line with Portuguese guideline recommendations. Sentinel Practice Network physicians diagnosed most cases, seldom changed prescriptions initiated by others, and had a different pattern of antidiabetic medicines use compared to other specialists.

Introdução: A diabetes tipo 2 tem um peso significativo nas despesas com medicamentos. Determinámos a proporção de novos doentes que iniciaram tratamento com cada classe de antidiabéticos, se o tratamento foi iniciado pelos médicos de família, se estes alteram as prescrições de outros médicos e comparámos padrões de prescrição de médicos de família e outros especialistas. Material e Métodos: Estudo transversal aninhado em coorte na Rede de Médicos Sentinela. Entre 2014 e 2015 casos incidentes de diabetes tipo 2 foram notificados, reportando o tratamento, quem fez a prescrição inicial e se tratamentos iniciados por outros médicos foram alterados. Resultados: Foram notificados 415 casos incidentes. Os Médicos Sentinela fizeram a prescrição inicial em 89,4% dos casos (IC 95% 86,0% - 92,0%). O tratamento inicial mais escolhido foi a metformina, em 85,5% dos doentes (IC 95% 81,8% - 88,6%). Os médicos de família utilizaram menos inibidores da dipeptidil peptidase-4 (4,2% vs 30,3%, p < 0,001) e insulina (0,3% vs 12,1%, p < 0,001) que outros especialistas. As prescrições iniciadas por outros foram alteradas em 4,5% dos casos (IC 95% 0,4% - 16,0%). Discussão: A colheita prospectiva dos dados é um ponto forte, mas foram notificados poucos casos de tratamento iniciado por outros especialistas. Dados sobre a gravidade da doença não estavam disponíveis e podem explicar parte das diferenças entre médicos de família e outros especialistas. Conclusão: A metformina foi o tratamento inicial mais escolhido, em linha com as recomendações das normas de orientação clínica Portuguesas. Os médicos da Rede Sentinela diagnosticaram a maioria dos casos, raramente alteraram prescrições iniciadas por outros e tiveram um padrão de prescrição diferente de outros especialistas.

Keywords: Diabetes Mellitus, Type 2/drug therapy; Hypoglycemic Agents; Portugal; Primary Health Care; Sentinel Surveillance.

MeSH terms

  • Aged
  • Cross-Sectional Studies
  • Diabetes Mellitus, Type 2 / drug therapy*
  • Diabetes Mellitus, Type 2 / epidemiology
  • Dipeptidyl-Peptidase IV Inhibitors / therapeutic use
  • Disease Notification / statistics & numerical data
  • Family Practice / statistics & numerical data
  • Female
  • Humans
  • Hypoglycemic Agents / therapeutic use*
  • Insulin / therapeutic use
  • Life Style
  • Male
  • Metformin / therapeutic use
  • Middle Aged
  • Portugal / epidemiology
  • Practice Patterns, Physicians' / statistics & numerical data

Substances

  • Dipeptidyl-Peptidase IV Inhibitors
  • Hypoglycemic Agents
  • Insulin
  • Metformin