Objective To investigate the risk factors of recurrence after adolescent pimary spontaneous pneumothorax(PSP) thoracicassisted surgery

and to provide a theoretical basis for the prevention of the PSP recurrence. Methods A total of 236 patients with PSP admitted into thoracic surgery department of Pinggu hospital of Beijing friendship hospital from November 2010 to January 2016 were selected.All patients were followed up for 24 months

the recurrence rate was recorded.Recurrence patients were included into observation group

nonrelapse patients were enrolled into the control group.All patients′ medical records were collected to study the influence of gender

age

length of stay on the recurrence of PSP.Then the independent risk factors for PSP recurrence after thoracoscopic surgery were analyzed by single factor and logistic regression analysis. Results During the followup of 24 months

the recurrence rate was 11.86% (28 cases) among 236 patients

with 16 cases on the left side and 12 cases on the right side;the recurrence time was (8.56±2.12) months

and the mean age was (24.34±3.54) years old.Body mass index (BMI)

pleurodesis

gender

postoperative smoking

number of preoperative PSP episodes

postoperative leak time

and thoracic tube drainage time were significantly different between two groups(P<0.05)

while no difference was found in the age

incidence site

length of stay

operation time

pleura fixation between two groups (P>0.05).Multivariate logistic regression analysis showed that preoperative PSP episodes ≥3 times(OR=2.543

95%CI:0.765~6.646)

postoperative smoking(OR=2.764

95%CI:1.032~7.521)

BMI<18.5 kg/m2(OR=2.214

95%CI:1.211~9.623)

without pleurodesis(OR=2.486

95%CI:1.186~7.326)were independent risk factors for PSP recurrence after thoracoscopic surgery. Conclusion PSP episodes ≥3 times

postoperative smoking

BMI<18.5 kg/m2

without pleurodesis may increase the risk of PSP recurrence after thoracoscopic surgery.