Tree This is the Tree Display. It first shows generic MeSH categories that you can skip over. When you click on CONTEXTS or scroll down the screen, you will see the tree structure for your search term. Tree for Heart Diseases Database: MEDLINE Scroll down for highlighted search term.  Select Subject Heading  Hits   Explode   Focus   Scope Note         Anatomy (Non MeSH)             Organisms (Non MeSH)             Diseases (Non MeSH)            Bacterial Infections and Mycoses 0   Virus Diseases 2771   Parasitic Diseases 680   Neoplasms 32145   Musculoskeletal Diseases 1633   Digestive System Diseases 505   Stomatognathic Diseases 109   Respiratory Tract Diseases 1987   Otorhinolaryngologic Diseases 464   Nervous System Diseases 4290   Eye Diseases 2573   Urologic and Male Genital Diseases 0   Female Genital Diseases and Pregnancy Complications 0   Cardiovascular Diseases 12604     Cardiovascular Abnormalities 107 The heart diseases Tree display is highlighted below. The MeSH terms that are indented under "heart diseases" are NOT subcategories or subheadings. They are completely independent MeSH Terms. The fact that they are indented under "heart diseases" tells us that these MeSH terms sit in the "heart diseases" family or tree. Notice the numbers that appear next to each MeSH term? These indicate the numbers of articles that are indexed to each individual MeSH term. If you click on the EXPLODE box next to heart diseases, the search will automatically incorporate into our search all of the related terms (those that are indented) in the tree.     Heart Diseases 6195       Arrhythmia 4861         Carcinoid Heart Disease 49         Cardiac Output, High 25         Cardiac Output, Low 1302         Cardiac Tamponade 738       Cardiomegaly 1811       Endocarditis 582         Heart Aneurysm 594       Heart Arrest 2851       Heart Defects, Congenital 4662       Heart Failure, Congestive 10821         Heart Neoplasms 1793       Heart Rupture 152       Heart Valve Diseases 2193       Myocardial Diseases 2600       Myocardial Ischemia 9168         Pericardial Effusion 988       Pericarditis 561         Pneumopericardium 89         Postpericardiotomy Syndrome 25         Pulmonary Heart Disease 213         Rheumatic Heart Disease 600       Ventricular Dysfunction 306         Ventricular Outflow Obstruction 492       Hyperemia 673     Pregnancy Complications, Cardiovascular 2057 Let's learn more about the EXPLODE, then the FOCUS options.

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