None listed
Conditions
Brief summary
Forty patients will be studied for this study. Routine monitoring (consisting of a pulse oximeter, 3-lead ECG and a non-invasive blood pressure cuff ) will applied. In addition to this monitoring two sensors (SomaSensors, Somanetics, Troy, MI) will be placed on each patient: One on the side of the peripheral nerve block and another at a similar site on the contralateral side. The sensor will be placed on the the ventral aspect of the mid-forearm. The sensors will connected to a two channel monitor (Invos 5100B monitor, Somanetics), which automatically recorded digital data approximately every 7 s for a maximum of 30 min. A blind anesthesia nurse, will record both sides skin temperature at baseline, immediately after LIB and 1 min intervals for 30 min, starting immediately after performing LIB.A blind anesthesia nurse, will record both sides tissue oxygen saturation values from the monitor at baseline, immediately after LIB and 1 min intervals for 30 min, starting immediately after performing LIB.
Interventions
Forty patients between the ages of 18-65 yr, ASA physical status I and II, scheduled for acute or elective hand or forearm surgery under lateral infraclavicular block, will studied.Routine monitoring (consisting of a pulse oximeter, 3-lead ECG and a non-invasive blood pressure cuff ) will applied. In addition to this monitoring two near infrared spectroscopy sensors which will monitor tissue saturation (SomaSensors, Somanetics, Troy, MI) will be placed on each patient: One on the side of the peripheral nerve block and another at a similar site on the contralateral side.Each sensor will be placed on a different arm.The sensor will be placed on the the ventral aspect of the mid-forearm. The sensors will connected to a two channel monitor (Invos 5100B monitor, Somanetics), which automatically recorded digital data approximately every 7 s for a maximum of 30 min.Sensors record every 7 seconds for 30 minutes starting immediately prior to the administration of the block.
Sponsors
Eligibility
Inclusion criteria
18-65 yr, ASA physical status I and II, scheduled for acute or elective hand or forearm surgery under lateral infraclavicular block
Exclusion criteria
Age less than 18 years, morbid obesity defined as body mass index (BMI) greater than 40, international normalised ratio more than 1.4, platelet count less than 80000 ,coagulopathy, medication with vitamin K antagonists, high-dose or fractionated heparin treatment, allergy to local anaesthetics, infection at the site of needle insertion, peripheral neurological disease, Raynaud’s phenomenon and patient refusal.