Avoid using adrenaline in locations with end-arteries such as digits, penis etc.
Ensure wound has been adequately irrigated/washed (e.g. with 1L of normal saline)
A basic irrigation can be accomplished with 1L of saline attached to a giving set. Squeeze the bag of saline and irrigating the entire wound (as deep and thoroughly as possible) with the pressurised fluid.
Prepare equipment
General Principles & Technique of Suturing
The needle should be inserted perpendicular to the skin
‘Bites’ should be equal in both distance and depth on both sides of the wound i.e. enter and exit at the same level in the tissues
Use the curve of the needle to pass the suture through the skin
Rotation of the wrist allows the needle to pass in an atraumatic fashion
Avoid pushing or pulling the suture through the skin in a straight line
Minimise handling of the wound edges
Use toothed forceps to hook the skin and avoid pinching/crushing the tissues
Wounds should be closed with minimal tension, use a buried dermal suture (see below) to reduce the tension of the skin closure in deep wounds
NOTE: Avoid dermal sutures in the face/hands
Wound edges should be slightly everted to ensure dermal apposition and a more cosmetically appealing scar
As a general rule, braided sutures should have three throws on the knots, monofilament sutures should have five throws
Keep wounds clean and dry for a minimum of 48hrs (at this point they should be waterproof
Advice on signs of infection and to seek medical attention if they develop
Give the patient advice on care of the wound
Following removal of sutures, if further support of the wound is required, Micropore™ tape can be used directly on the wound for 1 further week
Rough guide based on location on the body:
Face- 5 to 7 days (unless using Vicryl Rapide™) to avoid leaving unsightly cross hatching/suture marks
Hand/Foot-10-14 days
Trunk/Breast- 7-14 days
Important to remember that each patient and wound is unique and these are guides only
Document information for removal of sutures:
Simple ointments can be used around the lips, eyes and other awkward areas e.g. chloramphenicol ointment functions as both a moisturiser, protective layer and antimicrobial agent
Brown Micropore™ tape can be placed on facial wounds as a simple dressing which hides the scar/sutures
Apply a dressing if required
Dispose of sharps- always count your sutures and dispose of them safely in a sharps bin
Consider prophylactic antibiotics to reduce the risk of wound infection e.g. Co-Amoxiclav 375mg three times a day for 5 days (consult local guidelines)
Consider tetanus prophylaxis treatment
Click here for full UK government advice on tetanus
High risk wounds include: wounds requiring surgical managements with >6hour delay; puncture injuries or wounds with significant devitalised tissue; wounds in contact with soil or manure; wounds with retained foreign bodies; open fractures; wounds in patients with sepsis
Immunoglobulin prophylaxis dose: 250IU IM or 500IU IM if >24hrs since injury, heavy contamination or burns
Observe how your seniors and colleagues suture, the materials and sizes they choose and develop a set of sutures and a technique that you are comfortable with
Mount the needle approximately 2/3 from the tip in the needle-holder
Holding the needle-holders like a pen with the index finger supporting the tip of the needle holders gives better control for fine suturing than holding the handles with finger and thumb
Eversion of wound edges is best achieved by taking decent sized bites and ensuring that the needle is inserted perpendicular (or even slightly beyond 90o) to the skin
Try to use absorbable sutures in children wherever possible- they heal very well and removal of non-absorbable sutures can be almost as challenging as the suturing itself!
Avoid using the forceps to pinch the edges of the wound, rather use them to lift or hook the skin
Fine debridement of the wound edges to remove traumatised/inflamed/dirty skin promotes healing and produces a more cosmetically pleasing scar
Use a Penrose Drain and an artery clip as a tourniquet for suturing digits (remember to use a local anaesthetic ‘ring block’ (see Local Anaesthetics), document the tourniquet time and don’t forget to take it off!)
Consider use of nerve blocks for analgesia e.g. median nerve block, often less painful than local infiltration
Complications of suturing
Poor apposition of wound edges
‘Dog Ear’- unsightly and bulky ends to a wound due to uneven closure
Stitch Marks- scarring at the entry and exit point of the suture
Stitch Abscess- localised inflammation/infection around the suture material, more common with absorbable sutures
Infection- more common with braided sutures
Dehiscence- either due to poor technique, wound infection or excessive strain on the wound post closure
Skin necrosis- usually due to overly tight sutures or sutures placed too close together
Sutures can be broadly divided into Absorbable and Non-absorbable materials
Further subdivision into monofilament and multifilament (polyfilament) or braided
Also consider whether the material is synthetic or naturally occurring
Absorbable:
Do not need to be removed and can be left to breakdown in-situ
Nearly all synthetic materials, exception is catgut
Catgut: twisted thread of collagen fibres harvested from ruminants or beef tendon; not used in Europe (and other countries) due to risk of Bovine Spongiform Encephalopathy (BSE).
Absorbable materials are broken down through hydrolysis, thus inducing little tissue reaction (exception is catgut which is broken down through active inflammation)
Granuloma formation still occurs around sutures
Risk of ‘stitch abscess’ formation
At least 50% of strength is lost by 4 weeks (for majority)
Preferred in children as no need for removal
Non-absorbable:
Non-absorbable sutures (if on the skin) require removal- the duration of this is determined by the location on the body of the suture
Majority are synthetic, silk is the exception
Silk: gold standard for handling however is rarely used due to associated inflammatory response (response resolves swiftly after suture removal)
If used for skin closure, will require removal
Braided vs Monofilament:
Monofilaments:
Have ‘memory’- require straightening before use (pull to length and give one short sharp tug on the suture), otherwise will curl up, catch and irritate
Reduced surface area hence less tissue reaction (if absorbable)
If surface is damaged (poor handling, crush etc) strength is reduced significantly
Knots require tight tying due to tendency to come undone
Braided:
More difficult to handle
Do not easily ‘run’ through tissues
Slightly increased risk of infection
Increased reaction with surrounding tissues due to increased surface area
See table below for summary of common suture materials
Suture Sizes:
Many different sizes of suture used for different parts of the body/size of defect
Not referred to by the their size in metric units e.g. mm but by the USP (United States Pharmacopeia) sizes
Begin from the smallest ’11-0’ with the first number decreasing in size as the suture gets larger ie 10-0, 9-0, 8-0, 7-0 etc.
1-0 is simply called 0
Sutures larger than 0 are given a single number i.e. 1,2,3,4,5 with increasing size
Table 2 below lists suture sizes, their equivalent in mm and suggested uses
Needle selection:
Many different types of needle
Do not need to be too concerned with needle selection for simple procedures
As a rule use a curved conventional cutting needle for skin suturing. Reverse cutting needles can be used for fine closures but caution must be taken to avoid the suture ‘cutting out’
