Comparing the absorptive capacity of superabsorbent dressings to the clinical need

Introduction & Aim:

Superabsorbent dressings contain polymers that allow absorption and retention of large volumes of fluid. This assists in the management of highly exuding wounds. Absorbent capacity is commonly mentioned in product literature; however the clinical absorptive need is not often included. This study compared the performance of two superabsorbents with clinician’s requirements and expectations.

Method:

21 experienced clinicians were presented with 4x8” superabsorbent dressings filled with 0.35oz, 1.76oz, 3.5oz and 7oz of fluid. They were then asked to provide their opinion on at what point they would change a dressing, and reasons for changing a dressing prior to reaching capacity.

Absorbency testing: Dressings were weighed & submerged in an ionic solution at 37^oC for 30 minutes. Dressings were then removed, suspended for 30 seconds and re-weighed to determine the fluid absorbed.

Results & Discussion:

13 clinicians stated that they would not want a dressing to absorb more than 3.5oz of fluid before changing it. 6 stated they would change before 7oz was reached.

Reasons given for changing a dressing before capacity were- Dressings is too heavy (n=11), wound needs to be checked (n=9), patient comfort (n=8).

In the absorbency test Dressing A was shown to absorb 7.4oz/ dressing, and Dressing B was shown to absorb 16.5oz/dressing.

The clinician’s answers suggest that any absorptive capacity over 7oz is unlikely to be used, due to the dressing being too heavy or uncomfortable for the patient. This implies that excess absorbency may not be needed for clinical efficacy and could be adding additional cost for little clinical benefit.

Conclusion:

Absorbency values for dressings can be confusing, often being presented with no clinical context. This study has shown that very high values for absorbency may not be required for a dressing to provide clinical benefits, with 7oz capacity meeting clinical criteria.