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Article History

Received: 21 February 2018

Accepted: 27 November 2018

First Online: 3 January 2019

Ethics approval and consent to participate

: The study was approved by the ethics committee of West China Hospital review board for human research:2017(200). Since the critical care ultrasound examination was harmless and has been applied as a routine estimation on patients’ admission in our MICU, the committee approved the researchers to obtain verbal consent from all patients or the patients’ next of kin (when patients were intubated or unconscious) to consent this study.

: Not applicable.

: The authors declare that they have no competing interests.

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