Peripheral nerve block is one of the commonly used blocks in regional anesthesia. In regional
anesthesia applications, there are important advantages such as being conscious of the
patient, expressing his complaints, continuation of spontaneous breathing, preservation of
airway reflexes, continuation of analgesia in the postoperative period and early mobilization
of the patient.
In 1978, ultrasound (USG) was used for the first time in peripheral nerve block. With USG, it
is possible to monitor the nerves and anatomical structures, follow the needle, and reduce
the dose by monitoring the distribution of the local anesthetic administered. Therefore,
USG-guided peripheral nerve blocks are frequently used in anesthesia practice.
The Galvanic Skin Response (GSR) is a simple way to obtain autonomic nervous system dependent
sweat gland function as a parameter.
Physically, the galvanic skin response is the change in the electrical structure of the skin
to various stimuli. Changes in tension measured from the skin surface are recorded. The
galvanic skin response is a useful, simple and reproducible electrophysiological technique
for investigating sympathetic nervous system function.
The relaxation, calming response that accompanies an increase in skin resistance (causing a
decrease in GSR meter) is the body's combat response that accompanies a decrease in skin
resistance (causing an increase in GSR meter). Generally, low conductivity is a sign of
relaxation. High conductivity is a sign of emotional, mental, or physical arousal. The
galvanic skin response is a simple way to obtain autonomic nervous system-related sweat gland
function as a parameter.
the investigators aim in this study is to determine whether the block is successful in
successful infraclavicular brachial plexus blocks performed with USG, according to the change
in GSR value in the upper extremity blocked due to sympathetic nerve blockade. Block success
will be evaluated by sensory and motor examination of the blocked arm. The relaxation,
calming response that accompanies an increase in skin resistance (causing a decrease in GSR
meter) is the body's combat response that accompanies a decrease in skin resistance (causing
an increase in GSR meter). Generally, low conductivity is a sign of relaxation. High
conductivity is a sign of emotional, mental, or physical arousal.
In the investigators clinic, peripheral nerve blocks accompanied by USG are frequently used
in anesthesia practice.
OBJECTİVE: Successful peripheral nerve blockade results in local vasodilation, increased
local blood flow, and some increase in skin temperature due to sympathetic fiber blocking.
However, in busy operating room conditions, these clinical signs may not appear quickly
enough to confirm block adequacy, especially before or during surgery, and may not be used
for clinical decision making. Traditional methods for assessing block success are time
consuming and require patient cooperation. For the success of the block, it is aimed to use
the Galvanic Skin Response (GSR) value, which is a non-invasive method that does not require
patient cooperation and provides rapid evaluation.
Galvanic Skin Response (GSR) measurement is a non-invasive and rapid assessment that allows
us to observe the skin resistance change with two probes attached to the fingertip. In the
investigators study, we aimed to show that the Galvanic Skin Response (GSR) measurement
method is a reliable and objective method to evaluate the adequacy of peripheral nerve
blocks.
METHODS: This research; It is a prospective observational study. In patients who have
performed infraclavicular brachial plexus block; The correlation of Galvanic skin response
(GSR) values measured with the finger probe that we attached to the patient's two fingers
before and after the block, with the success of the block will be examined. the investigators
study is not invasive, it is only in the form of examining finger probe measurements and will
not create an additional cost for the investigators hospital and the participants..