- Design
- Systematic review and meta-analysis of 47 observational studies
- Population
- 30,002 head and neck free flaps
- Primary outcome
- Flap compromise and total flap failure
- Effect
- Compromise 8.2%, failure 3.9%; fluid overload OR 2.57, low albumin OR 2.06
A meta-analysis pooled 47 observational studies covering 30,002 head and neck free flaps. Pooled flap compromise was 8.2% (6.6% to 9.9%) and complete failure 3.9% (3.2% to 4.7%).
Prior radiotherapy had the strongest association (OR 3.98), with diabetes (2.20), age (1.35) and comorbidity (1.68) also contributing. The factors a team can act on were fluid overload (OR 2.57), prolonged operative time (2.14), low serum albumin (2.06), low BMI (1.75) and low haemoglobin (1.34).
Nutrition, anaemia and fluid balance are all addressable in the weeks before and hours during surgery. In Indian head and neck cancer practice, where many patients present malnourished after months of dysphagia, the nutritional findings are especially relevant.
- Check albumin, haemoglobin and weight at the first surgical visit, not the day before.
- Refer early to a dietitian and consider feeding support for weight loss or low albumin.
- Correct anaemia before elective reconstruction where time allows.
- Agree a goal-directed fluid plan with anaesthesia and avoid excess crystalloid.
- Plan the operation to limit total time, including two-team approaches.
Why it matters
It shifts attention from fixed risks such as prior radiotherapy to physiology that can be corrected in advance.
Don't overread it
These are associations from observational studies; correcting them has not been shown in trials to prevent flap loss.
The statistics, in plain English
An odds ratio of 2.57 for fluid overload means the odds of compromise were about two and a half times higher. Sicker patients are more likely to have both low albumin and complicated surgery, so some of the association may be confounding.
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