Kernrechtsfrage
Whether the post-operative blindness after aortic valve surgery resulted from an unusual external factor and therefore qualified as an accident.
Extrahierter Entscheid
The medical facts were insufficiently clarified. A new multidisciplinary expert opinion is required before the accident criterion can be assessed again.
Extrahierte Begründung
The court found the existing expert report inconclusive on the causal chain, the role of the alleged arterial injury, the hemodynamic collapse, and the exact development of the ischemic optic neuropathy. Without a clear mechanism, the presence of an unusual external factor cannot be reliably assessed.