BMJ 2000;320:141-145 ( 15 January )

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Risk of subarachnoid haemorrhage in first degree relatives of patients with subarachnoid haemorrhage: follow up study based on national registries in Denmark

David Gaist, postdoctoral fellow, ^a Michael Væth, professor, ^b Ioannis Tsiropoulos, consultant, ^c Kaare Christensen, professor, ^a Elisabeth Corder, professor, ^a Jørn Olsen, professor, ^d Henrik Toft Sørensen, associate professor. ^e

^a Epidemiology, Institute of Public Health, Universtity of Southern Denmark, Odense University, DK 5000 Odense C, Denmark, ^b Department of Biostatistics, University of Aarhus, DK 8000 Aarhus, Denmark, ^c Department of Neurology, Odense University Hospital, Odense, Denmark, ^d Danish Epidemiology Science Centre, University of Aarhus, ^e Department of Clinical Epidemiology of Aarhus and Aalborg University Hospitals at the Institute of Epidemiology and Social Medicine, University of Aarhus

Correspondence to: D Gaist d-gaist{at}win-chs.ou.dk

Objective: To estimate the risk of occurrence of subarachnoid haemorrhage in first degree relatives (parents, siblings, children) of patients with subarachnoid haemorrhage.
Design: Population based cohort study using data from the Danish National Discharge Registry and the Central Person Registry.
Subjects: Incident cases of subarachnoid haemorrhage admitted to hospital from 1977 to 1995 (9367 patients) and their first degree relatives (14 781).
Main outcome measures: The incidence rate of subarachnoid haemorrhage was determined for the relatives and compared with that of the entire population, standardised for age, sex, and calendar period. This process was repeated for patients discharged from neurosurgery units, as diagnoses from these wards had high validity (93%).
Results: 18 patients had a total of 19 first degree relatives with subarachnoid haemorrhage during the study period, corresponding to a standardised incidence ratio of 2.9 (95% confidence interval 1.9 to 4.6). Patients discharged from neurosurgery wards had a higher standardised incidence ratio (4.5, 2.7 to 7.3).
Conclusions: First degree relatives of patients with subarachnoid haemorrhage have a threefold to fivefold increased risk of subarachnoid haemorrhage compared with the general population.

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incidence of hospital admission does not equal incidence of disease

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