Should a local anesthetic be administered before placing skin staples on a laceration?

Local Anesthetic for Skin Staple Placement on Lacerations

Yes, local anesthetic should be administered before placing skin staples on lacerations to minimize pain and improve patient comfort during wound closure. 1

Rationale for Anesthetic Use

The American Academy of Dermatology guidelines explicitly recommend local infiltrative anesthesia for wound closure procedures, which includes staple placement. 1 While the guidelines specifically address suture repair, the principle applies equally to staple placement, as both involve manipulation of wound edges and tissue trauma that causes significant pain without anesthesia.

Anesthetic Options and Selection Algorithm

First-Line: Topical Anesthetics (When Appropriate)

For simple, clean lacerations presenting early (<6 hours), consider topical anesthetics first:

• LAT gel (lidocaine-adrenaline-tetracaine) is particularly effective for lacerations <4 cm and those on the head/scalp 2
• Application requires 20-30 minutes for adequate effect 3
• 76% of patients may not require additional injectable anesthetic after LAT application 3
• Specifically suitable for short lacerations and head wounds 2

Limitations of topical agents:

• Less effective on extremities/trunk compared to head (19% higher failure rate) 2
• Longer lacerations (>4 cm) more likely to require supplemental infiltration 2
• Not suitable for finger/toe lacerations in most studies 4

Second-Line: Local Infiltrative Anesthesia

When topical anesthetics are inadequate or inappropriate, use local infiltration:

• Lidocaine 1% with epinephrine (1:100,000 or 1:200,000) is the standard choice 1
• Maximum adult dose: 7 mg/kg lidocaine with epinephrine 1
• Maximum pediatric dose: 3.0-4.5 mg/kg lidocaine with epinephrine 1

Administration Technique to Minimize Pain

Key steps to reduce injection discomfort:

• Buffer the lidocaine with sodium bicarbonate (8.4% sodium bicarbonate mixed with 1% lidocaine with epinephrine in 1:9 or 1:10 ratio) - this decreases injection pain by 20-40% 1
• Aspirate before each injection to avoid intravascular administration 1, 5
• Use incremental injections rather than rapid bolus 1
• Inject through the wound edges rather than intact skin when possible
• Use the smallest gauge needle practical (27-gauge or smaller)

Safety Monitoring

Monitor for local anesthetic systemic toxicity (LAST):

• Early signs: circumoral numbness, facial tingling, metallic taste, tinnitus 1, 5
• Progressive signs: slurred speech, auditory changes, confusion 1
• Severe manifestations: seizures, cardiac depression/arrest 1
• Use the lowest effective dose to minimize toxicity risk 1, 5

Alternative Agents for Lidocaine Allergy

True lidocaine allergy is rare (1% of adverse reactions), but when present: 1

• Ester-type local anesthetics (e.g., procaine, tetracaine) - cross-reaction with amides is rare 1
• 1% diphenhydramine - slower onset (5 min vs 1 min) and limited efficacy 1
• Bacteriostatic normal saline (0.9% benzyl alcohol) - may be less painful than diphenhydramine when mixed with epinephrine 1

Common Pitfalls to Avoid

• Don't skip anesthesia for "quick" staple placement - the pain is significant and unnecessary
• Don't use topical anesthetics on finger/toe lacerations - infiltration is more reliable 4
• Don't exceed maximum dosing limits when calculating total lidocaine dose 1
• Don't inject rapidly - slow, incremental injection reduces pain 1
• Don't forget to aspirate before each injection to prevent intravascular administration 1, 5
• Don't buffer bupivacaine - it causes precipitation and decreased efficacy 1