Michel Roethlisberger1, Rita Achermann2, Schatlo Bawarjan3, Martin N Stienen4, Christian Fung5, Donato D'Alonzo6, Nicolai Maldaner4, Andrea Ferrari7, Marco V Corniola8, Daniel Schöni5, Daniele Valsecchi9, Rodolfo Maduri10, Martin A Seule7, Jan-Karl Burkhardt11, Serge Marbacher6, Philippe Bijlenga8, Kristine A Blackham12, Heiner C Bucher2, Luigi Mariani1, Raphael Guzman1, Daniel W Zumofen13. 1. Department of Neurosurgery, Basel University Hospital, University of Basel, Basel, Switzerland. 2. Department of Clinical Epidemiology and Biostatistics, Basel University Hospital, University of Basel, Basel, Switzerland. 3. Department of Neurosurgery, University Medical Center Göttingen, University of Göttingen, Göttingen, Germany. 4. Department of Neurosurgery, Zürich University Hospital, University of Zürich, Zürich, Switzerland. 5. Department of Neurosurgery, Inselspital, University of Bern, Bern, Switzerland. 6. Department of Neurosurgery, Kantonsspital Aarau, Aarau, Switzerland. 7. Department of Neurosurgery, Kantonsspital St. Gallen, St. Gallen, Switzerland. 8. Department of Neurosurgery, Geneva University Hospital, University of Geneva, Geneva, Switzerland. 9. Department of Neurosurgery, Ospedale Civico di Lugano, Lugano, Switzerland. 10. Service of Neurosurgery, Department of Clinical Neurosciences, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland. 11. Department of Neurological Surgery, University of California San Francisco, California, USA. 12. Division of Diagnostic and Interventional Neuroradiology, Department of Radiology, Basel University Hospital, University of Basel, Basel, Switzerland. 13. Department of Neurosurgery, Basel University Hospital, University of Basel, Basel, Switzerland; Division of Diagnostic and Interventional Neuroradiology, Department of Radiology, Basel University Hospital, University of Basel, Basel, Switzerland. Electronic address: daniel.zumofen@usb.ch.
Abstract
BACKGROUND: The literature on multiple intracranial aneurysms (MIA) in patients with aneurysmal subarachnoid hemorrhage (aSAH) focuses largely on risk factor analysis and consists essentially of retrospective cohort studies of limited sample size, or studies in populations outside Europe and North America. The purpose of this cohort study was to identify predictors for aneurysm multiplicity and to investigate the anatomic distribution of MIA in a representative Western cohort of patients with aSAH. METHODS: The Swiss Study of Subarachnoid Hemorrhage (SOS) database includes anonymized data from all tertiary neurovascular facilities in Switzerland. The dataset for 2009-2014 was used to compare characteristics of patients with aSAH and MIA and those with a single intracranial aneurysm (SIA) by means of descriptive and multivariate regression analysis. RESULTS: Among 1689 unselected patients with aSAH, 467 had MIA (prevalence, 27.6%). The location of the ruptured index aneurysm was correlated with the probability of finding bystander aneurysms and predicted their likely anatomic distribution. Patients with a ruptured basilar artery aneurysm (odds ratio [OR], 2.11; 95% confidence interval [CI], 1.30-3.44) or a ruptured middle cerebral artery aneurysm (OR, 1.86; 95% CI, 1.35-2.55) were at the greatest risk for having MIA. Larger size of the index aneurysm (OR per 1 mm, 1.03; 95% CI, 1.01-1.06) was also positively correlated with aneurysm multiplicity. Males were less likely than females to have MIA (OR, 0.79; 95% CI, 0.61-1.01). CONCLUSIONS: In patients with aSAH, the location of the ruptured index aneurysm is correlated with the probability of finding bystander aneurysms, and is predictive of the sites at which bystander aneurysms are most likely to be found.
BACKGROUND: The literature on multiple intracranial aneurysms (MIA) in patients with aneurysmal subarachnoid hemorrhage (aSAH) focuses largely on risk factor analysis and consists essentially of retrospective cohort studies of limited sample size, or studies in populations outside Europe and North America. The purpose of this cohort study was to identify predictors for aneurysm multiplicity and to investigate the anatomic distribution of MIA in a representative Western cohort of patients with aSAH. METHODS: The Swiss Study of Subarachnoid Hemorrhage (SOS) database includes anonymized data from all tertiary neurovascular facilities in Switzerland. The dataset for 2009-2014 was used to compare characteristics of patients with aSAH and MIA and those with a single intracranial aneurysm (SIA) by means of descriptive and multivariate regression analysis. RESULTS: Among 1689 unselected patients with aSAH, 467 had MIA (prevalence, 27.6%). The location of the ruptured index aneurysm was correlated with the probability of finding bystander aneurysms and predicted their likely anatomic distribution. Patients with a ruptured basilar artery aneurysm (odds ratio [OR], 2.11; 95% confidence interval [CI], 1.30-3.44) or a ruptured middle cerebral artery aneurysm (OR, 1.86; 95% CI, 1.35-2.55) were at the greatest risk for having MIA. Larger size of the index aneurysm (OR per 1 mm, 1.03; 95% CI, 1.01-1.06) was also positively correlated with aneurysm multiplicity. Males were less likely than females to have MIA (OR, 0.79; 95% CI, 0.61-1.01). CONCLUSIONS: In patients with aSAH, the location of the ruptured index aneurysm is correlated with the probability of finding bystander aneurysms, and is predictive of the sites at which bystander aneurysms are most likely to be found.