Evidence-based risk factors for complications and reoperations in inguinal hernia surgery have been defined:
- Age >80 years: High mortality risk with existing comorbidities; more seromas, urinary retention, and readmissions. Even at age > 60 years, more urinary retention and more complications.
- ASA III and higher: More complications and reoperations, increased mortality risk.
- Female gender: Increased risk of pain.
- Obesity: Tendency for more complications.
- COPD: More complications, increased mortality in outpatient surgery.
- Diabetes mellitus: Independent risk factor for postoperative complications.
- Anticoagulation/antiplatelet agents: 4-fold increased risk of postoperative bleeding. Even after discontinuation of anticoagulant medication, the risk of rebleeding is significantly increased.
- Immunosuppression/corticosteroid medication: Increased risk of recurrence.
- Liver cirrhosis: Significant increase in complication rates.
- Nicotine abuse: Significant increase in general and surgical complication risks.
- Bilateral inguinal hernia: Increased perioperative risk, therefore no prophylactic operation on a healthy side.
- Increased complication rate in recurrent procedures and femoral hernias.
- Preoperative pain frequently leads to acute and then chronic groin pain postoperatively.