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Primary and secondary wound healing differ in the way the wound is closed and the time it takes for the wound to heal. Primary wound healing, or primary intention wound healing, occurs in wounds with dermal edges that are close together. The wound is closed using staples, stitches, glues, or other fRead more
Primary and secondary wound healing differ in the way the wound is closed and the time it takes for the wound to heal. Primary wound healing, or primary intention wound healing, occurs in wounds with dermal edges that are close together. The wound is closed using staples, stitches, glues, or other forms of wound-closing processes. This reduces the tissue lost and allows the body to focus on closing and healing a smaller-area wound rather than the larger initial wound. It is usually faster than secondary intention.
Secondary wound healing, or secondary intention wound healing, occurs when a wound that cannot be stitched causes a large amount of tissue loss. Doctors will leave the wound to heal naturally in these cases. This may be more common for wounds that have a rounder edge, cover uneven surfaces, or are on surfaces of the body where movement makes stitches or other closure methods impossible. Secondary wound healing relies on the body’s own healing mechanisms. This process takes longer, which may be due to increased wound size, the risk of infection and contamination, and other factors.
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Primary wound healing, or primary intention wound healing, occurs in wounds with dermal edges that are close together. It is usually faster than secondary intention and occurs in four stages: Haemostasis, Inflammation, Proliferation, and Remodelling. In Haemostasis, the action of platelets and cytokRead more
Primary wound healing, or primary intention wound healing, occurs in wounds with dermal edges that are close together. It is usually faster than secondary intention and occurs in four stages: Haemostasis, Inflammation, Proliferation, and Remodelling. In Haemostasis, the action of platelets and cytokines forms a hematoma and causes vasoconstriction, limiting blood loss in the affected area. The close proximity of the wound edges allows for ease of clot formation and prevents infection by forming a scab. In Inflammation, a cellular inflammatory response acts to remove any cell debris and pathogens present. In Proliferation, cytokines released by inflammatory cells drive the proliferation of fibroblasts and the formation of granulation tissue. Angiogenesis is promoted by the presence of growth mediators, allowing for further maturation of the granulation tissue; the production of collagen by fibroblasts allows for the closure of the wound after around a week. In Remodelling, collagen fibers are deposited within the wound to provide strength in the region, with the fibroblasts subsequently undergoing apoptosis.
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