Lifelong rupture risk of intracranial aneurysms depends on risk factors: a prospective Finnish cohort study.
OBJECTIVE
Our aim was to define for the first time the lifelong natural course of unruptured intracranial aneurysms (UIAs) and identify high-risk and low-risk patients for the rupture.


METHODS
One hundred and eighteen patients (61 women) with UIAs were diagnosed between 1956 and 1978 and followed up until death or subarachnoid hemorrhage (SAH). The median age at the diagnosis was 43.5 years (range, 22.6-60.7 years). The median size of the UIA at the diagnosis was 4 mm (range, 2-25 mm). Analyzed risk factors for a rupture included sex, age, cigarette smoking, systolic blood pressure values, diagnosed hypertension, UIA size, and number of UIAs.


RESULTS
Thirty four (29%) out of 118 people had SAH during the lifelong follow-up. The median age at SAH was 51.3 years (range, 30.1-71.8 years). The annual rupture rate per patient was 1.6%. Female sex, current smoking, and aneurysm size of ≥7 mm in diameter were risk factors for a lifetime SAH. Depending on the risk factor burden, the lifetime risk of an aneurysmal SAH varied from 0% to 100%, and the annual rupture rate from 0% to 6.5%. Of the 96 patients with small (<7 mm) UIAs, 24 (25%) had an aneurysmal SAH during the follow-up.


CONCLUSIONS
Almost 30% of all UIAs in people of working age ruptured during a lifelong follow-up. The risk varied substantially on the basis of risk factor burden. Because even small UIAs ruptured, treatment decisions of UIAs should perhaps be based on the risk factor status.
From the Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland (M.K., H.L.); Neurosurgery Unit, Australian School of Advanced Medicine, Macquarie University, Sydney, New South Wales, Australia (M.K.); and Department of Clinical Neurosciences, University of Helsinki, Helsinki, Finland (S.J.).
Miikka
M
Korja
From the Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland (M.K., H.L.); Neurosurgery Unit, Australian School of Advanced Medicine, Macquarie University, Sydney, New South Wales, Australia (M.K.); and Department of Clinical Neurosciences, University of Helsinki, Helsinki, Finland (S.J.).
Hanna
H
Lehto
From the Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland (M.K., H.L.); Neurosurgery Unit, Australian School of Advanced Medicine, Macquarie University, Sydney, New South Wales, Australia (M.K.); and Department of Clinical Neurosciences, University of Helsinki, Helsinki, Finland (S.J.). seppo.juvela@helsinki.fi.
Seppo
S
Juvela
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017542:Aneurysm, Ruptured / Q000453:epidemiology*; D005260:Female; D005387:Finland / Q000453:epidemiology; D006801:Humans; D002532:Intracranial Aneurysm / Q000453:epidemiology* / Q000401:mortality / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012042:Registries; D012307:Risk Factors; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology; D013345:Subarachnoid Hemorrhage / Q000453:epidemiology*; D055815:Young Adult
follow-up studies; intracranial aneurysm; risk factors; smoking; subarachnoid hemorrhage