Study: NCT02920905

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: Lidocaine
Description: Two intravenous cannulae will be placed; one in a vein on the dorsum of the hand to be operated (22 gauge) and the other in the opposite hand. A double tourniquet will be positioned on the upper arm of the hand to be operated. Arm will be elevated for 2 min.~Circulatory isolation of arm will be confirmed by inspection of the color of the limb, absence of radial pulse and loss of pulse oximetry tracing in the ipsilateral index finger. The upper (proximal) tourniquet will then be inflated to a pressure of 100 mmHg above the systolic blood pressure of the patient. The anesthetic solution will be prepared by an observer and will be given over a period of 90 seconds.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: Lidocaine
Description: Two intravenous cannulae will be placed; one in a vein on the dorsum of the hand to be operated (22 gauge) and the other in the opposite hand. A double tourniquet will be positioned on the upper arm of the hand to be operated. Arm will be elevated for 2 min.~Circulatory isolation of arm will be confirmed by inspection of the color of the limb, absence of radial pulse and loss of pulse oximetry tracing in the ipsilateral index finger. The upper (proximal) tourniquet will then be inflated to a pressure of 100 mmHg above the systolic blood pressure of the patient. The anesthetic solution will be prepared by an observer and will be given over a period of 90 seconds.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: Lidocaine
Description: Two intravenous cannulae will be placed; one in a vein on the dorsum of the hand to be operated (22 gauge) and the other in the opposite hand. A double tourniquet will be positioned on the upper arm of the hand to be operated. Arm will be elevated for 2 min.~Circulatory isolation of arm will be confirmed by inspection of the color of the limb, absence of radial pulse and loss of pulse oximetry tracing in the ipsilateral index finger. The upper (proximal) tourniquet will then be inflated to a pressure of 100 mmHg above the systolic blood pressure of the patient. The anesthetic solution will be prepared by an observer and will be given over a period of 90 seconds.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: atracurium
Description: Two intravenous cannulae will be placed; one in a vein on the dorsum of the hand to be operated (22 gauge) and the other in the opposite hand. A double tourniquet will be positioned on the upper arm of the hand to be operated. Arm will be elevated for 2 min.~Circulatory isolation of arm will be confirmed by inspection of the color of the limb, absence of radial pulse and loss of pulse oximetry tracing in the ipsilateral index finger. The upper (proximal) tourniquet will then be inflated to a pressure of 100 mmHg above the systolic blood pressure of the patient. The anesthetic solution will be prepared by an observer and will be given over a period of 90 seconds.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: atracurium
Description: Two intravenous cannulae will be placed; one in a vein on the dorsum of the hand to be operated (22 gauge) and the other in the opposite hand. A double tourniquet will be positioned on the upper arm of the hand to be operated. Arm will be elevated for 2 min.~Circulatory isolation of arm will be confirmed by inspection of the color of the limb, absence of radial pulse and loss of pulse oximetry tracing in the ipsilateral index finger. The upper (proximal) tourniquet will then be inflated to a pressure of 100 mmHg above the systolic blood pressure of the patient. The anesthetic solution will be prepared by an observer and will be given over a period of 90 seconds.

Intervention type: DRUG
Group type: EXPERIMENTAL
Intervention: Mg sulphate
Description: Two intravenous cannulae will be placed; one in a vein on the dorsum of the hand to be operated (22 gauge) and the other in the opposite hand. A double tourniquet will be positioned on the upper arm of the hand to be operated. Arm will be elevated for 2 min.~Circulatory isolation of arm will be confirmed by inspection of the color of the limb, absence of radial pulse . The upper (proximal) tourniquet will then be inflated to a pressure of 100 mmHg above the systolic blood pressure of the patient. The anesthetic solution will be prepared by an observer and will be given over a period of 90 seconds.