LIDOCAINE
Local anaesthetic for the reduction
Forminjection
Dorsal penile block: 2.5 mL of 1% lidocaine without adrenaline at the 10 o'clock position, at the junction of the penis and the suprapubic skin and off the midline to spare the superficial dorsal vein, then a further 2.5 mL at 2 o'clock - 5 mL of 1%, which is 50 mg in all. Use a 25-gauge or 27-gauge needle and place it just deep to Buck's fascia, 3 mm to 5 mm beneath the skin, aspirating for blood before each injection. Never exceed 4.5 mg/kg or 300 mg. - A single block before the reduction; no repeat within 2 hours.
In a child use a solution weaker than 2%, so the volume can be larger, and keep the total below 5 mg/kg and below the adult ceiling of 300 mg per dose, with no repeat inside 2 hours (Egyptian National Drug Formulary - Cardiovascular 2024, lidocaine monograph, p84). Most mild paraphimoses in a boy reduce by hand with no anaesthetic at all, and the article's own paediatric option is the anaesthetic cream.
The article gives the block a needle gauge, two injection sites and a stated volume, where its topical alternative carries no quantity at all and, by the article's own account, can leave the skin too slippery to grip.
Paraphimosis - StatPearls (NCBI Bookshelf NBK459233) for the technique, the sites and the volume: 2.5 mL of 1% lidocaine without epinephrine at 10 o'clock and a further 2.5 mL at 2 o'clock, through a 25-gauge or 27-gauge needle just deep to Buck's fascia. The ceiling is the Egyptian National Drug Formulary - Cardiovascular 2024 (lidocaine monograph, p84), whose local injection entry says the dose varies with the procedure and sets cutaneous infiltration at a maximum of 4.5 mg/kg per dose not exceeding 300 mg, not repeated within 2 hours.
Paraphimosis is reduced at the bedside, and the article makes a formal penile anaesthetic block the answer when the paraphimosis is long-standing, extremely painful or severe - the cases where manual pressure alone will not be tolerated. It is the one anaesthetic technique in the article that comes with a volume, so it is the one that can be printed as a dose.
- Use a plain preparation. Never use lidocaine premixed with adrenaline on the penis.
- Aspirate before injecting and inject slowly. Accidental intravascular injection causes the tingling lips, ringing ears, confusion and fits of local anaesthetic toxicity.
- Work the ceiling out for the patient's weight before drawing up: 4.5 mg/kg in an adult, 5 mg/kg in a child, never more than 300 mg, and no repeat within 2 hours.
- The ordinary case needs none of it - the article says a mild, uncomplicated paraphimosis is usually reduced by hand without sedation or analgesia.
- The formulary contra-indicates a local lidocaine preparation where there is bacterial, viral or fungal infection at the site of application, and any amide local anaesthetic in someone hypersensitive to one.
- A dark, dusky, pale, blue or black glans is ischaemia and goes to a urologist immediately. Anaesthetising it buys no time.
- Egypt stocks lidocaine 1% as 10 mg/mL ampoules, which is the strength the article's block is written in.
| Egyptian brand | Manufacturer | Indicative price |
|---|---|---|
| LIDOCAINE 1% (OTSUKA) AMP. 5 ML | OTSUKA | 5.00 EGP |
| KAHICAINE 1% 50MG/5ML 3 AMP. | KAHIRA | 10.50 EGP |
| LIDOCAINE HYDROCHLORIDE 10MG/ML AMP. 2 ML | PHARCO B | 2.00 EGP |
| LIDOCAINE HCL 20MG/ML VIAL IM IV SC 20 ML (NET PRICE) | SIGMA TEC > VODACHEM | 9.75 EGP |
| LIDOCAINE HCL 20MG/ML VIAL IM IV SC 50 ML (NET PRICE) | SIGMA TEC > VODACHEM | 11.25 EGP |
| DEBOCAINE HCL 2% 50ML VIAL | ARABCOMED > DEBEIKY | 33.00 EGP |
| ULTRACAINE 20MG/ML VIAL 50 ML | MEMPHIS | 33.00 EGP |
| LIDOCAINE 2% 10 AMP. | ALEXANDRIA | 90.00 EGP |