<p begin="00:00:07.379" end="00:00:09.137" style="s2">- [Voiceover] A linear array transducer</p>
<p begin="00:00:09.137" end="00:00:11.666" style="s2">with a nerve exam type is used to perform</p>
<p begin="00:00:11.666" end="00:00:14.865" style="s2">a median and ulnar regional nerve block.</p>
<p begin="00:00:14.865" end="00:00:18.167" style="s2">The target depth is approximately<br />one to two centimeters</p>
<p begin="00:00:18.167" end="00:00:20.392" style="s2">in an 80-kilogram adult.</p>
<p begin="00:00:20.392" end="00:00:23.105" style="s2">The patient is placed supine with the arm</p>
<p begin="00:00:23.105" end="00:00:25.641" style="s2">externally rotated at the side.</p>
<p begin="00:00:25.641" end="00:00:28.475" style="s2">The transducer is placed<br />in a transverse plane</p>
<p begin="00:00:28.475" end="00:00:29.721" style="s2">at the wrist crease</p>
<p begin="00:00:29.721" end="00:00:31.120" style="s2">with the orientation marker</p>
<p begin="00:00:31.120" end="00:00:33.953" style="s2">directed towards the patient's right side.</p>
<p begin="00:00:33.953" end="00:00:38.214" style="s2">The hypoechoic pulsatile<br />ulnar artery is identified.</p>
<p begin="00:00:38.214" end="00:00:40.485" style="s2">It may be helpful to use color Doppler</p>
<p begin="00:00:40.485" end="00:00:42.265" style="s2">if the artery is small.</p>
<p begin="00:00:42.265" end="00:00:45.357" style="s2">The ulnar nerve is an oval, or triangular,</p>
<p begin="00:00:45.357" end="00:00:47.294" style="s2">bright, hyperechoic structure</p>
<p begin="00:00:47.294" end="00:00:50.318" style="s2">that lies immediately<br />medial to the artery.</p>
<p begin="00:00:50.318" end="00:00:52.141" style="s2">Trace the nerve up the forearm</p>
<p begin="00:00:52.141" end="00:00:54.392" style="s2">following the course of the artery.</p>
<p begin="00:00:54.392" end="00:00:57.527" style="s2">The ulnar nerve will start<br />to separate from the artery</p>
<p begin="00:00:57.527" end="00:01:00.689" style="s2">approximately 2/3 of<br />the way up the forearm.</p>
<p begin="00:01:00.689" end="00:01:03.902" style="s2">The separation allows safe<br />placement of local anesthetic</p>
<p begin="00:01:03.902" end="00:01:05.269" style="s2">around the nerve.</p>
<p begin="00:01:05.269" end="00:01:07.372" style="s2">Follow the fascial plane medially</p>
<p begin="00:01:07.372" end="00:01:10.376" style="s2">to the superficial and deep flexor muscles</p>
<p begin="00:01:10.376" end="00:01:14.030" style="s2">to identify the bright,<br />hyperechoic median nerve.</p>
<p begin="00:01:14.030" end="00:01:17.358" style="s2">The median nerve appears<br />as an oval, or triangular,</p>
<p begin="00:01:17.358" end="00:01:20.735" style="s2">bright, hyperechoic structure<br />between the muscles.</p>
<p begin="00:01:20.735" end="00:01:22.051" style="s2">The needle can be advanced</p>
<p begin="00:01:22.051" end="00:01:25.372" style="s2">using an in-plane or<br />out-of-plane technique.</p>
<p begin="00:01:25.372" end="00:01:28.332" style="s2">For an in-plane approach,<br />the needle is positioned</p>
<p begin="00:01:28.332" end="00:01:31.655" style="s2">one to two centimeters<br />lateral to the transducer</p>
<p begin="00:01:31.655" end="00:01:34.231" style="s2">and advanced under the transducer.</p>
<p begin="00:01:34.231" end="00:01:37.655" style="s2">The initial path for the needle<br />is toward the ulnar nerve</p>
<p begin="00:01:37.655" end="00:01:38.812" style="s2">to allow the needle tip</p>
<p begin="00:01:38.812" end="00:01:41.893" style="s2">to lie immediately beside the ulnar nerve.</p>
<p begin="00:01:41.893" end="00:01:45.441" style="s2">Inject three to five<br />cc of local anesthetic</p>
<p begin="00:01:45.441" end="00:01:48.604" style="s2">around the ulnar nerve<br />to perform the block.</p>
<p begin="00:01:48.604" end="00:01:52.681" style="s2">The needle is then redirected<br />laterally to the median nerve.</p>
<p begin="00:01:52.681" end="00:01:56.245" style="s2">Injection of three to five<br />cc of local anesthetic</p>
<p begin="00:01:56.245" end="00:01:57.726" style="s2">around the median nerve</p>
<p begin="00:01:57.726" end="00:02:00.809" style="s2">will complete the median nerve block.</p>