Diaphragm dysfunction is associated with prolonged ICU stays

weaning failure

and increased mortality

so timely assessment of diaphragm function is critical for patient outcomes.In the past

fluoroscopy

MRI

electromyography of diaphragm

transdiaphragmatic pressure and other methods were used to evaluate diaphragm function

but the use was limited due to radiation

invasive

complex operation and other reasons.As a real-time

non-invasive

non-radiative

economical

qualitative and quantitative examination method

ultrasound can be widely used in the monitoring of bedside diaphragm function. This article reviews the physiological characteristics of diaphragm

parameters of diaphragm function evaluation by ultrasound and clinical application.