Patients did not receive IWR-1 concentration lignocaine by any other route during the study. Blood pressure and pulse were recorded before and 5 min after pertubation. Serum samples were collected on a single occasion and, for practical reasons, at only one of the study centres. All patients who accepted the serum sampling at this centre were included in this additional Stattic research buy study (n = 25). A peripheral venous

catheter was inserted in vena brachialis before the treatment, and a 10 ml blood sample was collected at 0, 5, 15 and 30 min after pertubation, i.e. a total of 40 ml. The samples were centrifuged, the serum was stored at −70 °C (for 6–24 months) and later analysed in one batch for the concentration of lignocaine. The samples were collected from April 2007 until November 2008, and the analyses were conducted in April 2009. Since the study was blinded, tests were conducted both on patients who

received lignocaine (n = 16) and on those who received placebo (n = 9). The concentration of lignocaine in serum was determined with an LCMS-SIM method (OncoTargeting AB. Rapsgatan 7, 754 50 UPPSALA). The smallest observed peak with this method was 6 nM (1.4 ng/ml), the detection limit was 18 nM (4.2 ng/ml) and the limit of quantification was 60 nM (14.1 ng/ml). 2.2 Statistical Methods The data were analysed using descriptive statistics in Microsoft® Excel 2007. 3 Results In total,

124 Interleukin-3 receptor pertubations were carried out; 70 with lignocaine and 54 with HCS assay placebo. A total of 97 serum samples were collected from 25 patients, of whom 16 had been treated with lignocaine hydrochloride 10 mg and nine with placebo (ringer acetate). Due to problems with the peripheral venous catheter, samples could not be taken from one patient in the lignocaine group after 0 and 30 min, and a 30-min sample is also missing from the placebo group. Baseline data for patients included in the serum screening can be seen in Table 1. All patients were healthy and without cardiovascular or hepatic disease that might affect the pharmacokinetics of lignocaine. Most patients used analgesics when needed and some patients also used oral contraceptives, selective serotonin reuptake inhibitors (SSRIs) or levothyroxine (Table 1). Table 1 Demographics and medication Parameter Lignocaine, n = 16 Placebo, n = 9 Mean (SD) Min–max Mean (SD) Min–max Age, years 34.1 (5.8) 25–44 32.7 (5.6) 26–40 Weight, kg 66.9 (11.2) 50–90 69.8 (15.3) 50–98 Height, cm 164.3 (4.5) 155–172 168.3 (9.9) 156–181 Systolic blood pressure 121 (96) 105–140 118.4 (17.9) 100–148 Diastolic blood pressure 76.8 (8.5) 63–90 76.0 (8.8) 67–92 Heart rate 72.1 (9.4) 58–91 67.3 (5.