Natural disasters

Ward destruction

Fires/floods

Bomb warning

Health emergency

Not showing up, unable to be located, delayed admission, or death before surgery

Refuses surgery or does not sign the consent form

Acute or chronic condition that contraindicates surgery

Lack of fasting or preparation (e.g., intestinal)

Altered preoperative examinations or failure to suspend anticoagulation

Lack of evaluation by another specialty, incomplete preoperative study, or no surgical indication.

Scheduling error

No space in the recovery or critical patient unit

Absence of appointed legal guardian

Replaced due to emergency

Sterilization failure or incomplete instrumentation

Non-operational equipment

Lack of blood bank stock or critical medication

Lack of supplies or insufficient stock

Lack of coordination with imaging or pathological anatomy

Lack of surgeon, paramedical technician, anesthesiologist, or non-physician professional

Prolongation of surgical times

Lack of cleaning staff

Failure due to power failure, clinical gases, air conditioning, or humid network.

Elevator failure

Strike or staff mobilization