Surgical Complication or Medical Error? How Peer Review Draws the Line

Every surgery carries some level of risk. Complications can occur even when a surgeon selects the right procedure, performs it correctly, and provides appropriate follow-up care.

When a patient has a poor outcome, however, hospitals and medical staff leaders often face an important question:

Was this an expected surgical complication or a medical error?

The outcome alone rarely answers that question.

A patient may develop an infection, bleeding, organ injury, or another complication even when the care meets accepted standards. On the other hand, calling an event a “known complication” does not automatically mean that every part of the care was appropriate.

Clinical peer review helps healthcare organizations understand the difference.

Surgical Complications Can Occur Despite Appropriate Care

Many factors can affect a surgical outcome. These include the patient’s health, anatomy, underlying disease, medications, type of procedure, and complexity of the surgery.

Common surgical complications may include:

• Bleeding or hematoma
• Surgical site infection
• Wound problems
• Injury to nearby organs or structures
• Anastomotic leak
• Blood clots
• Breathing problems
• Unplanned conversion to open surgery
• Readmission
• Return to the operating room

The presence of a complication does not prove that a surgeon made an error.

Instead, peer review asks a more important question:

Based on the information available at the time, did the surgeon make reasonable clinical decisions and provide care that met accepted standards?

Answering that question requires a review of the entire episode of care.

What Does Surgical Peer Review Evaluate?

A thorough surgical peer review starts before the operation and continues through the patient’s recovery. The reviewer looks at clinical decisions, actions, communication, and the patient’s response to treatment.

1. Was the Surgery Necessary?

The first question often involves the reason for surgery.

Did the patient’s symptoms, examination, imaging, or test results support the procedure? Were other treatment options available? If conservative treatment was appropriate, did the care team consider or try it?

A surgeon can perform an operation correctly while questions still remain about whether the patient needed the procedure.

2. Did the Team Prepare the Patient Appropriately?

Before surgery, the care team should identify important risks and address them when possible.

Depending on the procedure and the patient’s condition, the reviewer may examine:

• Medical conditions
• Medications
• Anticoagulation
• Laboratory results
• Imaging
• Anesthesia risk
• Infection risk
• Need for specialist consultation

The reviewer considers whether the care team identified important risks and took reasonable steps to prepare the patient for surgery.

3. Was the Procedure Performed Appropriately?

Next, the reviewer examines the procedure itself.

Key questions may include:

• Did the surgeon choose a reasonable approach?
• Did the operative note support appropriate surgical technique?
• How did the surgeon respond to unexpected findings?
• Did the surgeon recognize problems that occurred during the procedure?
• Did the surgeon respond appropriately?
• Did the situation require additional help, a different approach, or stopping the procedure?

A change in the surgical plan does not necessarily indicate an error.

For example, a surgeon may need to convert a minimally invasive procedure to an open operation because of bleeding, scar tissue, unusual anatomy, or another unexpected finding. In some cases, changing the approach represents good surgical judgment and protects the patient from further harm.

The Complication Is Only Part of the Story

One of the most important parts of surgical peer review involves separating the initial complication from the response to that complication.

The complication itself may have been difficult or impossible to prevent. The care team still needs to recognize and manage it appropriately.

Consider a patient who develops bleeding after surgery. Bleeding may represent a known risk of the procedure.

The reviewer would then examine what happened next.

Did the care team monitor the patient’s vital signs? Did anyone recognize changes in hemoglobin levels? Did the patient develop increasing pain, a rapid heart rate, low blood pressure, or other warning signs? Did staff notify the surgeon? Did the surgeon evaluate the patient? Were diagnostic tests or treatment ordered when needed?

These questions help determine whether the complication itself caused the poor outcome or whether a delay in recognizing and treating the problem contributed to additional harm.

Timing Matters

Many surgical cases do not involve one obvious error. Instead, the concern develops over several hours or even days.

A patient’s condition may slowly begin to change. Early warning signs can include increasing heart rate, worsening pain, low blood pressure, reduced urine output, abnormal laboratory results, increased oxygen needs, or changes in mental status.

One finding may not immediately signal a serious problem. Several findings together, especially when they continue to worsen, may require further evaluation.

Peer reviewers examine the timeline carefully. They look at what the care team knew at each point and whether clinicians responded appropriately as the patient’s condition changed.

This approach also helps prevent outcome bias. Reviewers should judge decisions based on the information available at the time—not on information that became available hours or days later.

A Known Complication Does Not Always Mean the Care Was Appropriate

A common assumption in surgical case review is:

“This is a known complication of the procedure, so no medical error occurred.”

The issue is often more complex.

A known complication can still involve opportunities to improve care.

For example, infection is a recognized risk of many surgical procedures. However, a reviewer may need to examine antibiotic use, infection prevention practices, wound care, recognition of symptoms, and the timing of treatment.

Bleeding provides another example. A procedure may carry a known risk of bleeding, but a delay in recognizing severe postoperative bleeding could raise a separate concern.

Instead of asking only whether the complication can happen, peer review asks:

Did the care team take reasonable steps to prevent the complication, recognize it promptly, and manage it appropriately?

That distinction is central when evaluating a surgical complication vs. medical error.

Documentation Supports the Review

The medical record plays a major role in peer review.

A surgeon may have a sound reason for choosing one treatment over another, continuing observation, delaying an intervention, or changing the surgical approach. Clear documentation helps the reviewer understand that reasoning.

The medical record should describe important elements such as:

• The patient’s condition
• Significant test and imaging results
• Reasons for major clinical decisions
• Changes in the patient’s condition
• Communication among members of the care team
• Significant risks and treatment alternatives
• Responses to complications
• Plans for monitoring and follow-up

Good documentation does not replace good clinical care. However, it provides important evidence about the decisions clinicians made and why they made them.

Surgical Outcomes Often Involve the Entire Care Team

A poor surgical outcome does not always result from the actions of one surgeon.

Many people and hospital processes can affect the patient’s care, including:

• Nursing staff
• Anesthesia providers
• Hospitalists
• Consulting specialists
• Laboratory and imaging services
• Operating room staff
• Pharmacy
• Rapid response teams
• Hospital policies and escalation processes

Communication and escalation can become especially important after surgery.

For example, a surgeon may respond quickly after receiving notice that a patient is deteriorating. However, the review may show that staff waited too long to contact the surgeon.

In another case, nurses may repeatedly report concerns, but the provider may not respond or reassess the patient in a timely manner.

Peer review helps separate individual provider concerns from system-level concerns. Some cases may involve both.

Identifying the difference allows the organization to focus improvement efforts where they can have the greatest impact.

Avoiding Outcome Bias in Surgical Peer Review

Knowing that a patient suffered a serious injury or died can influence how people view earlier clinical decisions.

This is called outcome bias.

An objective reviewer should ask:

What information did the clinician have when the decision was made?

The reviewer should not judge an earlier decision only with the benefit of knowing what happened later.

A reasonable clinical decision does not become inappropriate simply because the patient had a poor outcome. Likewise, a good outcome does not automatically prove that every clinical decision was appropriate.

Fair peer review focuses on the quality of the care and decision-making—not simply the final result.

Key Questions When Reviewing a Surgical Case

When evaluating a possible surgical complication vs. medical error, peer reviewers may consider the following questions:

1. Was the surgery clinically appropriate?
2. Did the care team evaluate and prepare the patient appropriately?
3. Did the surgeon choose a reasonable surgical approach?
4. Did the care meet accepted clinical standards?
5. Could the care team reasonably have prevented the complication?
6. Did clinicians recognize the complication in a timely manner?
7. Did they respond appropriately once they identified or suspected the problem?
8. Did communication and escalation occur when needed?
9. Does the medical record clearly explain important clinical decisions?
10. Did individual actions, system issues, or both contribute to the outcome?

These questions help shift the focus away from whether the patient simply had a “good” or “bad” outcome.

Instead, peer review examines whether the clinical decisions and actions were reasonable based on the circumstances at the time.

Why Independent External Peer Review Matters

Surgical cases can present challenges for internal peer review.

Some cases require highly specialized clinical knowledge. Smaller hospitals may not have another surgeon in the same specialty who can review the case. Professional relationships among medical staff members can also make objective review more difficult.

External peer review gives healthcare organizations access to an independent specialist who can examine the medical record, clinical decisions, and circumstances surrounding the event.

An effective external peer review should provide more than a rating.

It should help the organization answer important questions:

Did the care meet accepted standards?

Was the complication preventable?

Did clinicians recognize and manage the complication appropriately?

Were there opportunities to improve care?

Did provider actions, system issues, or both contribute to the outcome?

The answers can help medical staff and quality leaders identify meaningful opportunities for improvement while supporting a fair and objective peer review process.

The Bottom Line

Not every surgical complication is a medical error.

At the same time, describing an event as a “known complication” should not end the review.

Determining the difference between a surgical complication vs. medical error requires careful review of the clinical indication, surgical care, decision-making, recognition of complications, response, communication, escalation, documentation, and system factors.

The goal of peer review is not to judge a surgeon based solely on the patient’s outcome. The goal is to determine whether the care was reasonable under the circumstances and identify opportunities to improve patient safety and quality of care.