Skip to main content

Subcutaneous infiltration with ammonium sulphate 10% does not prolong the local anaesthetic duration of lidocaine in humans

Buy Article:

The full text article is temporarily unavailable.

We apologise for the inconvenience. Please try again later.



The aim of the present study was to investigate whether a solution of ammonium sulphate and lidocaine had a prolonged duration of action compared with lidocaine alone after subcutaneous infiltration in human volunteers.


In a double-blind, randomised, controlled trial 12 male volunteers had either 4 ml lidocaine 1% (40 mg) or a solution of 4 ml ammonium sulphate 10% and lidocaine 1% (40 mg) subcutaneously infiltrated in corresponding skin areas on the right and left calf. The duration of the local anaesthetic action of the test medications was assessed 1–6 h after the infiltrations using thresholds to mechanical (von Frey hairs) and thermal stimulation (heat detection thresholds: HDT, and heat pain dectection thresholds: HPDT), and by calculation of areas under the curve (AUC) for electronic visual analogue scale (VAS) pain ratings (sampled at 2 Hz) during a heat stimulation on the test areas for 30 s with a 45°C warm thermode.


At no assessment were thresholds to mechanical or thermal stimulation increased in favour of ammonium sulphate treated legs compared with control legs. On the contrary, HPDT were significantly lower in ammonium sulphate treated legs than control legs at the 3 h and 4 h assessment after infiltration (P<0.02). Similarly, the AUC for the VAS ratings was significantly higher in treatment legs compared with control legs 2 h and 3 h after infiltration (P<0.05).


No improvement in local anaesthetic duration of ammonium sulphate 10% plus lidocaine 1% compared with lidocaine 1% alone was demonstrated early after subcutaneous infiltration in human volunteers.

Keywords: Ammonium sulfate; acute pain; lidocaine; local anesthetics

Document Type: Original Article

Affiliations: 1: Departments of Anaesthesiology, Herlev University Hospital and 2: Silkeborg County Hospital, Denmark

Publication date: August 1, 2000


Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more