What is a Fishbone (Ishikawa) diagram and how might it be used to analyze a spike in infection rates after surgery?

• A. A Fishbone diagram is a causal diagram that organizes potential causes into categories (People, Methods, Machines, Materials, Environment, Measurement); for a postoperative infection, map factors like hand hygiene, sterilization, antibiotic timing, OR temperature, adherence to protocol, and postoperative wound care.
• B. A statistical chart showing infection rates over time.
• C. A patient survey instrument.
• D. A checklist for surgical equipment.

Answer: (A)

A Fishbone diagram, also called an Ishikawa diagram, is a cause-and-effect tool that visually groups potential causes of a problem into categories such as People, Methods, Machines, Materials, Environment, and Measurements. When investigating a spike in postoperative infections, this structure helps a team brainstorm and map factors across these areas—hand hygiene, sterilization processes, timing of antibiotic prophylaxis, operating room conditions, adherence to protocols, and postoperative wound care—and see how different elements might interact to drive the rise in infections. It guides systematic root-cause analysis rather than just listing data over time, surveying patients, or checking equipment alone, helping identify where targeted changes could have the most impact.