1. Concept

Negative pressure suction therapy is a method of promoting wound healing, helping to remove secretions, reduce edema, improve blood flow to tissues and promote wound healing. This method has been widely applied in the treatment of chronic, difficult-to-heal wounds.

  1. Mechanism

– The suction machine is based on the principle of negative pressure, applied to the wound to help improve the environment at the wound base, create conditions for granulation tissue to grow, and promote faster healing.

– Thanks to suction through negative pressure, the wound can:

+ Remove extracellular exudate and exudate from the wound

+ Moisturizing

+ Reduce the amount of bacteria

+ Remove harmful enzymes: collagenases, metalloproteinases, protease

+ Cyclic compression and stretching of the wound

+ Increases perfusion, provides nutrients and oxygen to the wound base, helps promote the growth of granulomatous tissue.

Enhances growth factor release, matrix production, wound contraction and cell proliferation (granulation tissue formation and epithelialization).

  1. Point

– 24-hour negative pressure suction therapy is indicated when the wound is exuding a lot of fluid, the wound is infected or threatened with infection such as:

 + Wounds that are difficult to heal as a result of severe burns, surgical complications, …

 + Chronic wounds: pressure ulcers stage 3.4; diabetic foot ulcer…

 + Ulcers due to radiation therapy

  1. Contraindications

– There are no absolute contraindications, however, this method should not be applied in the following cases:

+ necrotic tissue

+ Ulcers with fistulas of unknown origin

+ Wounds open into body cavities or where internal organs are vulnerable

+ Wounds that expose blood vessels or organs

  1. Carry out, conduct, commence

5.1 Kits

– Negative pressure suction machine

– Liquid tank

– Sponge sponge

– Set of straws

– Sticker

5.2 Prepare the patient

– Explain to the patient and family about the procedure to be performed.

– Let the patient go to the toilet before placing the suction machine.

5.3 Medical records

– Prepare documents according to regulations

5.4 Steps to take

– Assess the wound, select the appropriate size of the sponge according to the size of the wound.

After washing the wound, dry the area around the wound with sterile gauze.

– Place the sponge to the size of the wound, secure the sponge with tape, place the suction tube connector on top of the sponge, connect the suction tube to the fluid reservoir and attach it to the machine.

– Turn on the machine in continuous or intermittent suction mode, which can be adjusted depending on the position and nature of the wound. During the suction process, the sponge must collapse.

5.5 Complications

– During the suction process, it may cause pain if the suction pressure is too high.

– May cause blood loss.

– Overgrowth of granulation tissue into the foam may lead to bleeding when the dressing is removed.

  1. Benefits of VAC . treatments

– The wound is kept clean, dry and free of odors.

– Reduce pain for the patient every time the dressing is changed

– Eliminate bacterial inhibition.

– Increased perfusion

– Regeneration of granulomatous tissue.

– The effect is 61% faster than the conventional method.

– Reduces the risk of infection by 30%.

– Reduce up to 83% of financial burden.

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