Greif R. et al. (New England Journal of Medicine, 2000), 500 patients: increasing inspired oxygen concentration in the perioperative phase halves surgical wound infection risk. One of the most cited results in perioperative surgical history.
Pre-operative room of a premium clinic: warm clinical light, a fingertip pulse oximeter and vitals monitor; absolute order; no faces.
The mechanism: oxidation as a bactericidal weapon
Neutrophils use oxygen to produce free radicals with antimicrobial action (oxidative burst) — the primary bulwark against surgical pathogens.
Macro detail of tissue oxygenation: microcirculation rendered on a clinical screen, warm red-amber tones; no faces.
Effectiveness depends directly on partial pressure of oxygen in the tissue.
The link with pre-operative readiness
Bright ward with large windows onto the mountains, an empty bed and premium-standard instrumentation; no faces.
Improving oxygenation in the weeks before surgery through exercise, respiratory optimisation and maintaining SpO₂ in the optimal range is active infectious prevention. The Digital Twin monitors all these proxies.
Gloves and instruments ready on a sterile drape under soft surgical light, wound healing as the outcome; no faces.
The cost of a post-surgical infection
A surgical site infection (SSI) prolongs hospital stay by an average of 7–14 days, increases treatment costs, often requires re-intervention. Reducing risk by 50% is a clinical and economic priority.
Pre-operative room of a premium clinic: warm clinical light, a fingertip pulse oximeter and vitals monitor; absolute order; no faces.
Application in the Digital Twin
The Digital Twin monitors nocturnal SpO₂ as part of the pre-operative readiness profile. Average nocturnal SpO₂ below 95% or frequent desaturations are flagged for OSAS or oxygenation impairment assessment.
Macro detail of tissue oxygenation: microcirculation rendered on a clinical screen, warm red-amber tones; no faces.
Greif R. et al. — New England Journal of Medicine (2000) — https://www.nejm.org/doi/full/10.1056/NEJM200001203420303 · www.nejm.org
On the same topic
- 5,000 Steps a Day Before Surgery. A Simple Protocol with a Measurable Clinical Result.Walking at 5,000 steps/day significantly improves VO₂ peak and 6MWT distance in pre-operative COPD patients.
- ERAS + Early Mobilisation: The Protocol That Transforms Surgical Recovery.ERAS and early mobilisation reduce complications, accelerate ambulation and lower hospital stay. The post-operative Gold Standard monitored by the Digital Twin.
- Exercise Before Surgery Reduces Complications by 48%. The Systematic Review Proves It.Pre-operative physical training increases VO₂max by +2 ml/kg/min and reduces post-op pulmonary complications by 48%.