International study identifies major triggers of postoperative mortality

Millions of orthopedic surgeries are performed globally every year, offering pain relief and restored mobility to patients. However, an international study published in JMIR Perioperative Medicine warns that the risk of postsurgical complications, particularly “silent” heart injuries, demands far more rigorous monitoring than is currently standard practice.

The study, a substudy of the Vascular Events in Noncardiac Surgery Patients Cohort Evaluation (VISION), evaluated data from 8,385 adult patients across 28 centers in 14 countries. Led by an international team of researchers from institutions including McMaster University, the Population Health Research Institute (PHRI) and the University of California, the research sheds light on what happens to patients in the critical 30 days following an orthopedic operation.

The findings: A 1.6% mortality rate with drastic variations

The study tracked patients undergoing a wide variety of orthopedic procedures, finding an overall 30-day mortality rate of 1.6% (132 patients). Strikingly, more than one-third of these deaths (36.4%) occurred after the patients had already been discharged from the hospital.

The risk of mortality fluctuated dramatically depending on the specific type of surgery performed:

• Above-knee amputation: 13.6% mortality rate
• Internal fixation of the femur: 3.9% mortality rate
• Lower leg amputation: 3.6% mortality rate
• Major hip or pelvic surgery: 1.7% mortality rate
• Major spine surgery: 0.6% mortality rate
• Knee arthroplasty: 0.2% mortality rate

The researchers also noted that urgent or emergent surgeries carried more than double the risk of 30-day mortality compared with planned, nonemergent procedures.

The top three deadly complications

Using advanced time-dependent statistical modeling, the research team isolated six postoperative complications independently associated with death. Crucially, they calculated the attributable fraction—the proportion of deaths that could theoretically be prevented if these complications were entirely avoided.

Three main complications emerged as the primary drivers of mortality:

1. Myocardial Injury after Noncardiac Surgery (MINS): Accounting for 20.6% of the attributed deaths, MINS was the single largest contributor to mortality. MINS is a form of heart injury that is largely asymptomatic, meaning patients rarely experience chest pain or typical heart attack symptoms, leaving it completely undetected without blood tests.
2. Major bleeding: Responsible for 16.5% of the deaths. While orthopedic surgeons are highly aware of bleeding risks, this study underscores its severe independent impact on long-term survival.
3. Sepsis: Responsible for 9.7% of the deaths, acting as a highly lethal systemic response to infection.

Other significant complications associated with early mortality included stroke, infection without sepsis and new-onset atrial fibrillation.

Traditional risk-scoring systems often overlook the massive variations between different types of orthopedic surgeries. This study demonstrates that specialty-specific, procedure-specific data is vital to properly stratify patient risk and allocate higher-level postoperative care, such as intensive cardiac monitoring or telemetry.

Furthermore, while the routine use of anti-bleeding medications like tranexamic acid has successfully kept blood-clotting risks low in orthopedic wards, major bleeding remains a critical, modifiable threat to patient survival.

Provided by
JMIR Publications

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Gaby Clark

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Andrew Zinin

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