据龚贺的同事向张凯转述，他被送到医院之后，体温是42摄氏度。医生说“送来晚了”，死因是“热射病”。“热射病”即重症中暑，患者体温会迅速升高，高达40摄氏度以上或出现低血压休克、心律失常、意识障碍等症状。

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