Aspirin for patients undergoing major lung resections: hazardous or harmless?

OBJECTIVES: Acetylsalicylic acid (ASA, aspirin) is a medication widely used for primary and secondary prevention of cardiovascular diseases, which are the leading cause of morbidity and mortality worldwide. Whether aspirin should be continued or paused in the perioperative period remains controversial, especially in thoracic surgical settings. METHODS: A single-centred retrospective study comprised 486 patients. Of these, 329 patients did not use aspirin (group ASA-0) and 157 did (group ASA-1) during the perioperative period after anatomical lung resection at our hospital from January 2013 to December 2016. Major outcome measures were the amount of blood loss during the operation and during the first 5days postoperatively (per Mercuriali's formula), as well as the amount and proportion of the blood transfusion (packed red cells) received. The need for reoperation due to a postoperative haemothorax and/or bleeding was recorded. The groups were also compared according to their rates of morbidity and mortality. Inferential statistical methods with bootstrap analysis using 1000 samples and the Mersenne Twister, a random number generator, were used. RESULTS: There were no significant differences between the 2 groups in intraoperative bleeding [ASA-0(M)=418.69ml, standard deviation (SD) 364.87; ASA-1(M)=399.8 ml, SD +/- 323.84; P=0.58] or in total blood loss according to Mercuriali's formula (ASA-0(M)=1111.62 ml, SD +/- 816.69; ASA-1(M)=1115.08 ml, SD +/- 682.12; P=0.95). A total of 104 patients received transfusions up to postoperative day 5: 71 patients in the ASA-0 group received 151 blood transfusions, whereas 33 patients in the ASA-1 group received 65 blood transfusions (P=0.66). The indication for reoperation due to bleeding (ASA-1=3, ASA-0=4; P=0.69) was similar between the groups. There was a trend towards higher rates of postoperative complications in the ASA-1 group (risk ratio (RR)=1.28; P=0.055); neither cardiovascular complications nor deaths were more frequent in either of the 2 groups (P=0.73). CONCLUSIONS: Patients taking aspirin therapy and undergoing anatomical lung resection seem not to be at any disadvantage regarding bleeding. However, a trend towards a higher rate of postoperative complications indicates a basically increased risk for operations due to comorbidities in these patients.