Tā bìngwēi tōngzhīshū fāchū hòu, jiārén dōu gǎn lái le.
After the critical illness notice was issued, his family all rushed over.
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usage
病危通知书 is the formal 'critical condition notice' hospitals give to patient families, indicating the patient may not survive. It is a significant medical and legal document in the Chinese healthcare system.