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Cilj: Cilj ovog istraživanje bio je prikaz utjecaja dobi dana na poslijeoperacijske ishode bolesnika operiranih zbog mehaničke opstrukcije debelog crijeva uzrokovane karcinomom. Ispitanici i postupci: 132 punoljetna bolesnika operirana zbog mehaničke opstrukcije kolona uzrokovane karcinomom tijekom 2020. i 2021. Od toga 54 žene, odnosno 40,9%. Desna hemikolektomija urađena je kod 46 operiranih ili 35,6%, a stoma je formirana u ukupno 60 bolesnika ili 45,5%. Uspoređivana je dob, spol, vrijeme početka, trajanje i vrsta zahvata, patohistološka dijagnoza, transfuzija i otpust. Rezultati: Umrlo je ukupno 9 bolesnika, odnosno 6,8%, a transfuziju je primilo 18 ili 13,6%. Medijan duljine boravka u bolnici bio je 6,0 dana (IQR 5,0-8,0 dana), odstranjenih limfnih čvorova 15,0 (IQR 9,3-21,0) i trajanja operacijskog zahvata 107,5 min (IQR 80,0-130,0 min). Trajanje hospitalizacije kod muškaraca bilo je statistički dulje za 1,0 dan (95%CI: 0,00-2,0; P=0,018). Medijan trajanja zahvata kod muškaraca bio je 110 min (90-135), a kod žena 95min (80-116; P=0,033). Od dva do osam sati nije se pristupalo operacijama. Broj limfnih čvorova nije u korelaciji s vremenom početka zahvata (Pearsov koeficijent korelacije r=0,042; 95%CI:0,133-0,215; P=0,640). U popodnevnoj smjeni (14-22h) medijan odstranjenih limfnih čvorova je 18,0 (IQR 11-22), a u noćnoj (22-6h) je 12 (IQR 7-0). Trajanje operacije nije se razlikovalo ovisno o dobu dana, no rangiranje medijana upućuje na razliku popodnevne i noćne smjene (P=0,387). Formiranje stome nije se razlikovalo u smjenskim skupinama (P=0,156). Zaključak: Broj odstranjenih limfnih čvorova nije povezan s vremenom početka operativnog zahvata, no pri podjeli smjenskog rada postoje naznake o određenim razlikama. Veći broj odstranjen je u popodnevnoj smjeni u odnosu na noćnu. Trajanje zahvata također nije u korelaciji s vremenom početka zahvata, ali postoje naznake da noćni zahvati traju duže od popodnevnih. Formiranje stome neovisno je o dobu dana., Objectives: 132 adults operated because of mehanical bowel obstruction caused by colorectal cancer during 2020 and 2021. There were 54 women or 40.9%. Right hemicolectomy was performed in 46 operated patients (35.4%) and in 60 patients (45.5%) stoma was formed. We compared age, sex, start time, duration and type of procedure, PHD, transfusion and discharge. Subjects and methods: A total of 9 patients died, or 6.8%, and 18 or 13.6% patients recieved blood transfusion. The median length of hospital stay was 6.0 days (IQR 5.0-8.0 days), number of removed lymph nodes was 15.0 (IQR 9.3-21.0) and duration of surgery 107.5 min (IQR 80.0- 130.0). The duration of hospitalisation in men was statistically longer by 1.0 day (95%CI: 0.00- 2.0; P=0.018). The median duration of procedure in men was 110min (90-135), and in women 95 (85-116; P=0.033). There were no operations between 2 and 8 o“clock. The number of removed lymph nodes does not correlate with the start time of procedure (Pears correlation coefficient r=0.042; 95%CI: 0.133-0.215; P=0.640). In the afternoon shift (14-22h) median of lymph nodes is 18.0 (IQR 11-22), and in the night shift (22-6h) it is 12.0 (IQR7-0). The duration of operation does not depend on time of day, but median ranking indicates a difference between afternoon and night shift (P=0.387). There was no difference in stoma formation between shifts (P=0,156). Results: The number of removed lymph nodes is not related to the start time of operation, but there are some indications of certain differences between shift work. There was higher number of removed nodes during afternoon shift compared to the night shift. The duration of procedure is also not correlated with the start time, but there are some indications that night procedures last longer than afternoon ones. The stoma formation does not depend on time of the day.