Objective To investigate the value of bedside ultrasound in the diagnosis and prognosis evaluation ofpatients with severe pneumonia due to mechanical ventilation.MethodsA total of 87 patients with pneumonia due tomechanical ventilation in the department of critical medicine in our hospital were selected.Patients were examined by bedsideultrasound

CT

and laboratory examinations.According to the severity of pneumonia

the patients were divided into 47 cases insevere pneumonia group and 40 cases in non-severe pneumonia group.The diagnostic value of bedside ultrasound for severepneumonia was evaluated

and the characteristics of bedside ultrasound in patients with different prognosis were compared.ResultsBedside ultrasound showed significant differences in the pulmonary consolidation

number of subpleural lesions

number of intercostal changes of pleura and pulmonary ultrasound scores between patients in the severe pneumonia group andthe non-severe pneumonia group（all P<0.05）.The patients with pleural effusion in the severe pneumonia group was higher thanthat in the non-severe pneumonia group

but the difference was not statistically significant. Bedside ultrasound accuratelydiagnosed 40 cases of severe pneumonia

and CT accurately diagnosed 41 cases.The sensitivity

specificity and accuracy rate ofbedside ultrasound and CT examination of severe pneumonia were 85.11%

82.50%

83.91% and 87.23%

85.00%

86.20%

respectively.And there was no significant difference between the two examinations.In the severe pneumonia group

9 cases diedand 38 cased survived. Bedside ultrasound showed that there were statistically significant differences in lung consolidation

number of subpleural lesions

number of intercostal changes

and pulmonary ultrasound scores between the dead patients andsurviving patients.The proportion of pleural effusion in dead patients was higher than that in surviving patients

but the differencewas not statistically significant.ConclusionBedside ultrasound has high value in the diagnosis and prognosis evaluation ofpatients with severe pneumonia due to mechanical ventilation.