Impact of Short-Term Weight Loss on Hemostasis and Thrombosis after Bariatric Surgery

Introduction. Obesity causes thrombophilia and many coagulation problems related to slowing the capillary flow. We aimed to evaluate rapid weight loss outcomes in the early period after bariatric surgery on the coagulation system. Materials and Method. A prospective study enrolled 28 patients with a BMI > 40 kg/m2 who underwent bariatric surgery. Preoperative and postoperative (first and third months) demographic criteria—such as age, gender, weight, height, and alcohol and tobacco use, and biochemical parameters such as PLT, PT, aPTT, INR, bleeding time, coagulation time, fibrinogen, D-dimer, albumin, calcium, ionized calcium, vitamin D, and PTH—were analyzed. Results. We found that both bleeding and thrombotic parameters increase in early-slowing surgery. The first-month platelet levels were significantly different from the preoperative values ( $p$ < 0.001). The prothrombin time in the first ( $p$ < 0.001) and third months ( $p$ < 0.009) was also comparable. The PTT in the first month was higher than in the preoperative period ( $p$ < 0.011). INR in the first month ( $p$ < 0.001) was higher than that in the preoperative period and the third month ( $p$ = 0.007) value was higher than in the first month. In terms of fibrinogen levels, all parameters indicated statistical significance within each other; preoperative to the first month ( $p$ < 0.001), the first month to the third month ( $p$ < 0.016). Third-month D-dimer levels were lower than the first month’s values ( $p$ = 0.032). Conclusion. Thromboembolic events have crucial importance in the converse scenario of haemorrhagic diathesis during the first months of bariatric surgery. Vitamin support and antithrombotic agents may be recommended in the early postoperative period.