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<article><div id="d-article"><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also" itemprop="name">His bundle electrography</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>His bundle electrography is a test that measures electrical activity in a part of the heart that carries the signals that control the time between heartbeats (contractions).</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>The bundle of His is a group of fibers that carry electrical impulses through the center of the heart. If these signals are blocked, you will have problems with your heartbeat.</p><div class="videobox"><div class="group"><img class="rollover_globals" alt="Cardiac conduction system" title="Cardiac conduction system" src="//medlineplus.gov/ency/images/ency/tnails/200080t.gif"/>Watch this video about:<a class="blk" href="../anatomyvideos/000021.htm">Cardiac conduction system</a></div></div><p>The His bundle electrography is part of an <a test="test" href="./003867.htm">electrophysiology</a> study (EPS). An <a test="test" href="./002383.htm">intravenous</a> catheter (IV line) is inserted into your arm so that you can be given medicines during the test.</p><p><a test="test" href="./003868.htm">Electrocardiogram</a> (ECG) leads are placed on your arms and legs. Your arm, neck, or groin will be cleaned and numbed with a local anesthetic. After the area is numb, the cardiologist (heart doctor) makes a small cut in a vein and inserts a thin tube called a catheter inside.</p><p>The catheter is carefully moved through the vein up into the heart. An <a test="test" href="./003337.htm">x-ray</a> method called fluoroscopy helps guide the doctor to the right place. During the test, you are watched for any abnormal heartbeats (<a test="test" href="./001101.htm">arrhythmias</a>). The catheter has a sensor on the end, which is used to measure the electrical activity of the bundle of His.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>You will be told not to eat or drink anything for 6 to 8 hours before the test. The test will be done in a hospital. Some people may need to check into the hospital the night before the test. Otherwise, you will check in the morning of the test. Although the test may take some time, most people do not need to stay in the hospital overnight.</p><p>Your health care provider will explain the procedure and its risks. You must sign a consent form before the test starts.</p><p>About half an hour before the procedure, you will be given a mild sedative to help you relax. You will wear a hospital gown. The procedure may last from 1 to several hours.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>You are awake during the test. You may feel some discomfort when the IV is placed into your arm, and some pressure at the site when the catheter is inserted.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>This test may be done to:</p><ul><li>Determine if you need a pacemaker or other treatment</li><li>Diagnose arrhythmias
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</li><li>Find the specific location where electrical signals through the heart are blocked</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>The time it takes for the electrical signals to travel through the bundle of His is normal.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>A pacemaker may be needed if the test results are abnormal.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>Risks of the procedure include:</p><ul><li>Arrhythmias</li><li><a test="test" href="./000194.htm">Cardiac tamponade</a></li><li><a test="test" href="./001124.htm">Embolism from blood clots at the tip of the catheter </a></li><li>
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Heart attack
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</li><li>Hemorrhage</li><li>Infection</li><li>Injury to the vein or artery</li><li>Low blood pressure</li><li><a test="test" href="./000726.htm">Stroke</a></li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>His bundle electrogram; HBE; His bundle recording; Electrogram - His bundle; Arrhythmia - His; Heart block - His</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div name="Images" class="section-body" id="section-tnails"><ul class="img-grid group">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/1135t.jpg" alt="ECG" title="ECG" class="side-img"/><a href="../imagepages/1135.htm">ECG</a></li>
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</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Curtis AB, Tomaselli GF. Approach to the patient with cardiac arrhythmias. In: Libby P, Bonow RO, Mann DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. <em>Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine</em>. 12th ed. Philadelphia, PA: Elsevier; 2022:chap 61.</p><p>Issa ZF, Miller JM, Zipes DP. Atrioventricular conduction abnormalities. In: Issa ZF, Miller JM, Zipes DP, eds. <em>Clinical Arrhythmology and Electrophysiology: A Companion to Braunwald's Heart Disease</em>. 4th ed. Philadelphia, PA: Elsevier; 2024:chap 10.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 5/8/2024</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>Updated by: Thomas S. Metkus, MD, Assistant Professor of Medicine and Surgery, Johns Hopkins University School of Medicine, Baltimore, MD. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. </p>
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