Pheochromocytoma in Denmark during 1977-2016: validating diagnosis codes and creating a national cohort using patterns of health registrations

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  • Andreas Ebbehoj
  • Sarah Forslund Jacobsen, Department of Medical Endocrinology, Rigshospitalet, Copenhagen, Denmark
  • ,
  • Christian Trolle
  • Maciej Grzegorz Robaczyk, Department of Clinical Medicine, Aalborg University, Aalborg, Denmark; Department of Endocrinology, Aalborg University Hospital, Aalborg, Denmark.
  • ,
  • Åse Krogh Rasmussen, Department of Medical Endocrinology, Rigshospitalet, Copenhagen, Denmark
  • ,
  • Ulla Feldt-Rasmussen, Department of Medical Endocrinology, Rigshospitalet, Copenhagen, Denmark
  • ,
  • Reimar Wernich Thomsen
  • Per Løgstrup Poulsen
  • Kirstine Stochholm
  • Esben Søndergaard

Background: Pheochromocytoma and catecholamine-secreting paraganglioma (PPGL) are rare but potentially life-threatening tumors. We aimed to validate diagnosis codes for PPGL in the Danish National Patient Registry, the Danish National Pathology Registry, and the Danish Registry of Causes of Death and to create a national cohort of incident PPGL patients by linking these three registries. 
Patients and methods: We obtained data from the three abovementioned registries for all individuals registered with pheochromocytoma or catecholamine hypersecretion in Denmark during 1977–2016 (average population 5.30 million). We then reviewed health records for all individuals living in the North Denmark Region and Central Denmark Region (average population 1.75 million) to validate the diagnosis of PPGL. We tested a number of algorithms for accurately identifying true cases of PPGL to maximize positive predictive values (PPVs) and
completeness. The best algorithm was subsequently validated in an external sample. 
Results: We identified 2626 individuals with a PPGL diagnosis code in Denmark, including 787 (30.0%) in the North Denmark Region and Central Denmark Region. In this subsample, we retrieved the health records of 771/787 (98.0%) individuals and confirmed 198 incident PPGL patients (25.3%). The PPV of PPGL diagnosis codes was 21.7% in the Danish National Patient Registry, 50.0% in the Danish Registry of Causes of Death, and 79.5% in the Danish National Pathology Registry. By combining patterns of registrations in the three registries, we
could increase the PPV to 93.1% (95% confidence interval [CI]: 88.5–96.3) and completeness to 88.9% (95% CI: 83.7–92.9), thus creating a national PPGL cohort of 588 patients. PPV for the optimal algorithm was 95.3% (95% CI: 88.5–98.7) in the external validation sample. 
Conclusion: Diagnosis codes for pheochromocytoma had low PPV in several individual health registries. However, with a combination of registries we were able to identify a near-complete national cohort of PPGL patients in Denmark, as a valuable source for epidemiological research.

Original languageEnglish
JournalClinical epidemiology
Volume10
Pages (from-to)683-695
Number of pages13
ISSN1179-1349
DOIs
Publication statusPublished - 13 Jun 2018

    Research areas

  • registry-based research, International Classification of Diseases, ICD, SNOMED, hospital register diagnoses, pathology register, cause of death register, Pheochromocytoma

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