Vertical Mattress Suturing Technique: Step-by-Step Guide

The deep dermal stitch is a surgical technique used to relieve tension on wounds before closing the superficial skin layer, involving alternating bites from deep to superficial on each side of the wound to bury the knot within the tissue, and always requires absorbable sutures since they cannot be removed later.

Deep tension relief sutures (similar to inverted sutures but in the deep dermis) are used to reduce tension on wound edges before superficial closure. This technique is particularly important in plastic surgery to prevent visible scarring. By relieving tension in the deep dermis, subsequent superficial sutures (like intradermal or simple sutures) can be placed more easily without causing tissue strangulation or visible marks.

Subcuticular suturing is a surgical technique where the needle passes through the dermis layer (the white layer beneath the epidermis) rather than the epidermis itself, with stitches placed parallel to the skin surface and knots tied deep within the dermis to create an invisible closure; the technique requires consistent depth, proper suture exit on the same side for interrupted sutures, pulling lengthwise along the incision rather than perpendicular, and can be performed as either interrupted or running sutures depending on incision length.

The running subcuticular stitch is a continuous suturing technique used for closing surgical incisions, where the suture passes through the dermal layer at the dermal-epidermal junction (transition from deeper pink to lighter pink tissue) rather than through the epidermis; key principles include maintaining consistent suture depth to prevent proud edges, pulling taut after each pass (especially important for non-monocle sutures), and tying a secure knot at the end while ensuring the suture remains hidden beneath the skin for optimal cosmetic results.

Dermal sutures should be placed at the dermal-epidermal junction to provide strength to the incision closure. The closer the suture is to this junction, the tighter the stitch will be. While precise placement is important in plastic surgery, for cyst removal the primary goal is to add a strength layer that will hold the incision closed.

This comprehensive guide covers suture removal from medical professionals to wilderness first aid. Key points include: (1) Healthcare providers should remove sutures as they assess healing and infection risks; (2) Leaving sutures too long causes railroad-track scars and infection risk; (3) Use a timing table based on body location; (4) Assess wounds for proper closure, solid tissue below sutures, and infection signs (spreading redness, pus); (5) Three main suture types require specific removal techniques: simple interrupted (single cut after isolating knot), horizontal mattress (lift, wiggle, cut, verify complete removal), and vertical mattress (same principles). Always check doctor's notes for suture count as scabs can hide sutures.

Simple interrupted suture: needle at right angle, traverses both edges, exits at right angle, knots at each end. Continuous suture: begins like interrupted, then continuous until far end secured with buried knot (used for rectus sheath). Mattress sutures for irregular wound edges: Horizontal (parallel to incision, needle moves horizontally), Vertical (perpendicular to incision, needle moves vertically). Subcuticular suture (Monocryl) for cosmetic areas with buried suture. Purse-string suture for circular wounds (hernia, appendectomy). Suture removal by region: Eyelids/lips 3-4 days, Eyebrows/nose 3-5 days, Face 3-4 days, Scalp 6-8 days, Chest/abdomen 8-10 days, Ear/hand/back extremities 10-14 days, Foot/sole 12-14 days. Mnemonic: Face (except ears) = 4 days, Scalp/chest/abdomen = 4×2 = 8 days, Rest = 4×3 = 12 days.

Simple suture (most common) uses non-absorbable material (nylon/silk), enters at 90-degree angle, with entry/exit points 3-5 mm apart. Vertical mattress suture (Senn/Pack) sutures multiple planes in one operation, provides good edge inversion, used for scalp wounds (entry point 7-8 mm). Horizontal mattress suture is for high-tension wounds, contraindicated for continuous sutures in obese patients. Buried horizontal mattress suture (three-point) reduces necrosis risk in flaps with poor blood supply. Simple interrupted suture with inverted knot approximates deep planes, closes dead space, uses absorbable material. Continuous simple suture is contraindicated in high-tension areas. Suture removal timing: scalp (3-5 days), eyelid (2 days), face (4-5 days), upper extremity (8-10 days), lower extremity (8-12 days).

Interrupted mattress sutures combine interrupted and mattress principles, allowing longer retention without cross-hatching scars. Knot tying requires placing the final throw horizontally for flatness, limiting extra throws since they don't add strength. Square knots and granny knots serve different purposes. Polished suture materials like white crayon require tying in one direction, then same direction, then opposite to square the knot. Suture removal timing varies by location: face (3-5 days), oral cavity (6-8 days), neck (5-6 days), sternum (10 days), abdomen (10-14 days), leg (10-14 days). Removal involves cleaning, lifting with non-tissue-damaging forceps, cutting close to surface, and pulling toward the incision. Leaving sutures too long causes abscess, stretch marks, and dermal atrophy; premature removal causes dehiscence.

Suture removal timing depends on location and tension: facial sutures are typically removed in 5-7 days, while body sutures stay in place 7-14 days. Areas with high motion or thick skin may require longer suture retention due to tension on the wound. Dissolvable sutures should also be removed within these timeframes because they continue causing irritation even as they dissolve. Non-dissolving sutures (clear or blue fishing line type) must be manually removed. Both types serve their purpose during healing but should be removed once their job is done.

Excessive suture tension during wound closure leads to a cascade of complications: (1) Tight sutures compress and occlude blood vessels, (2) This vascular occlusion causes tissue ischemia and edema, (3) Ischemic tissue becomes necrotic and prone to infection, (4) Infected tissue causes sutures to cut through the skin, (5) This results in wound dehiscence (opening) and infection. This principle applies universally across all surgical procedures, including ear surgery, spaying, and other soft tissue procedures.

Tummy tuck wound healing involves multiple potential complications. Wound separation (dehiscence) occurs when top sutures separate because they carry less stress than deeper stitches holding the abdomen together—treatment involves simple cleaning and natural healing. Infections range from superficial cellulitis (treatable with antibiotics) to deep wound infections requiring surgical drainage and packing. Spitting stitch syndrome involves minor infections around individual stitches, treatable by removing the stitch. Numbness and hyperesthesia (nerve hypersensitivity) are common nerve-related side effects treatable with touch therapy using multiple stimuli. These complications, while uncomfortable, typically resolve without long-term consequences.

Wound dehiscence occurs when a sutured surgical wound opens again, typically 7-10 days postoperatively. Causes include technical errors, emergency surgery, infection, hematoma, seroma, obesity, high intra-abdominal pressure, corticosteroid use, diabetes, and malnutrition. Prevention involves interrupted sutures and avoiding excessive tension. Surgical site infection (SSI) has three types: superficial, deep, and organ/space. Clinical signs include tenderness, edema, drainage, and purulent fluid. Prevention includes antibiotic prophylaxis, avoiding excessive tension sutures, and using absorbable mesh.

Surgical site infection occurs within 30 days (90 days with prosthetics), caused by endogenous flora. Risk factors include age >60, immunosuppression, obesity, diabetes, malnutrition, smoking, and previous radiation. Procedures are classified by infection risk: clean (1-5%), clean-contaminated (5-10%), contaminated (up to 20%), infected. Depth classification (superficial, deep, organ-space) guides treatment. Superficial infections present with local signs without systemic symptoms; treatment involves drainage and debridement without routine antibiotics unless cellulitis or prosthetics are present. Deep infections present with systemic symptoms and require debridement plus antibiotics. Organ-space infections involve intracavitary organs and require comprehensive management. Wound dehiscence is separation of sutured tissues, classified as superficial (skin/subcutaneous) or deep (muscle/aponeurosis). Primary cause is surgical site infection; other factors include technical errors, hematoma, increased intra-abdominal pressure, obesity, corticosteroids, malnutrition, neoplasia, radiation, and chronic diseases. Evisceration is protrusion of viscera through the incision, representing the most severe form. Prevention involves optimizing patient factors (glycemic control, smoking cessation, nutrition) and proper surgical technique with layered closure using continuous suture 1 cm from edges with 1 cm spacing. Management depends on defect size: small dehiscences may be managed conservatively, while large defects require surgical revision.

Surgical wound infections arise from patient flora (Staph aureus, E. coli) presenting with pain, pyrexia, and discharge. Examination reveals erythema, tenderness, warmth, and swelling. Investigations include FBC, U&Es, inflammatory markers, blood cultures, and pus samples. Management involves targeted antibiotics, rationalization upon culture results, and fluid resuscitation for septic patients. Wound dehiscence exposes underlying structures due to infection, with risk factors including obesity, malnutrition, steroids, immunosuppression, and smoking. Management includes saline-soaked dressings for exposed viscera requiring emergency surgery, while partial-thickness cases may be managed conservatively with antibiotics and wound packing.