The occurrence and grade of air emboli
AIR EMBOLUS
Among 199 cases in the control group, air emboli were discovered in 21 cases with an occurrence rate of 10.55%, including 11 cases with single air embolus and 10 cases with multiple air emboli. Among 187 cases in the case group, air emboli were observed in 7 cases (an occurrence rate of 3.74%), with single air embolus in 2 cases and multiple air emboli in 5 cases. Moreover, the cases of air emboli were less in the case group than in the control group with a statistical significance (
The occurrence of air emboli in two groups of patientsThe 21 cases of air emboli in the control group consisted of 15 cases of small-grade air emboli, 6 cases of moderate-grade air emboli, and no cases of large-grade air emboli. The 7 cases of air emboli in the case group comprised 7 cases of small-grade air emboli and no cases of moderate- and large-grade air emboli. Cases with air emboli in the case group were less than those in the control group, and only small-grade air emboli were monitored in the case group (Table 
Grading results of grading of air emboli (the Fisher’s exact test) in the two groups