thoracotomy, 1278 treatment goals, 1276 triage considerations, 1276 Hennebert sign, 159 Henoch–Schönlein purpura (HSP), 164 , 218 , 233 , 235 , 302 , 355 , 402 , 406 , 412 , 415 , 732 , 983 –984 , 1296 , 1337 Heparin-induced thrombocytopenia (HIT), 790 –791 Hepatic dysfunction, definition, 77 t Hepatitis B virus, 475 Hepatobiliary tree tumors, 912 –915 clinical assessment, 913 –914 clinical recognition, 913 evidences, 912 goals of treatment, 912 management, 914 Hepatoblastoma, 1309 f Hepatocyte injury, 289 Hepatomas, 1309 , 1309 f Hepatomegaly, 87 , 88 t, 89 –90 , 92 t Hepatosplenomegaly (HSM), 1013 Hereditary angioedema, 583 –584 clinical recognition, 583 laboratory assessment, 583 management, 583 –584 pathophysiology, 583 treatment, goals of, 583 –584 triggers, 583 Hereditary diseases, 1177 Hereditary epidermolysis bullosa, 352 Hernias, 413 , 415 epigastric, 1310 incarcerated inguinal, 1299 incarcerated umbilical, 1299 Herniated disc, 305 Herpes gingivostomatitis, 347 , 348 f, 352 Herpes keratitis phlyctenule, 174 Herpes simplex encephalitis, 892 , 892 f Herpes simplex virus (HSV), 81 , 119 , 125 , 173 , 254 , 347 , 438 , 1343 , 1398 f fluorescein staining pattern, 1399 f nonneonatal, 852 –854 Herpes simplex virus-2 (HSV-2), 312 Herpes simplex virus type (HSV-1), 1316 Herpes zoster infection, 157 Herpes zoster ophthalmicus, 173 , 1398 f Herpetic corneal infection, 173 Herpetic gingivostomatitis, 312 Herpetic stomatitis, 508 Herpetic whitlow, 1343 , 1343 f High-altitude illness clinical recognition, 695 management and diagnostic studies, 696 physiologic changes, 695 prevention efforts, 696 recognition of, 695 treatment, goals of, 695 triage and initial assessment, 695 High-flow nasal cannulas (HFNC), 49 High-reliability organizations, , t High-tension electrical injuries, 734 High-voltage injuries, 699 Hill–Sachs deformities, 1182 , 1182 f Hip dislocations, 1198 clinical assessment, 1198 clinical recognition, 1198 dislocation, 1198 disposition, 1199 evidences, 1198 femoral neck fractures, 1199 intertrochanteric fractures, 1199 management, 1198 –1199 proximal femoral physeal fractures, 1198 –1199 radiographs, 1198 f right femoral neck fracture, 1199 f treatment of, 1197 –1198 triage considerations, 1198 Hip/proximal femur clinical assessment, 1198 clinical recognition, 1198 dislocation, 1198 disposition, 1199 evidences, 1198 femoral neck fractures, 1199 intertrochanteric fractures, 1199 management, 1198 –1199 proximal femoral physeal fractures, 1198 –1199 Salter–Harris type I fracture, 1199 f treatment goals, 1197 triage considerations, 1198 Hirschberg light reflex test, 177 , 177 f Hirschsprung-associated enterocolitis (HAEC), 129 , 552 Hirschsprung disease, 87 , 129 , 153 , 358 , 552 , 1304 –1305 , 1304 f, 1304 t, 1307 anorectal manometry in, 1305 barium enema studies in, 1304 f, 1305 differential diagnosis of, 1304 t Hirschsprung enterocolitis, 504 Histiocytic diseases, 906 –907 clinical assessment, 907 clinical recognition, 906 –907 evidences, 906 goal of treatment, 906 Histiocytic disorders, 312 , 314 Histiocytosis X, 318 Histoplasmosis, 444 Histotoxic hypoxia, 478 Hoagland sign, 163 Hodgkin lymphoma, 112 , 312 , 314 , 910 Hollow abdominal viscera injuries, 1091 Hopkins syndrome, 557 Hordeolums, 1401 –1402 Hormonal contraception, 538 Hormone-secreting tumors, 344 Horner syndrome, 183 f, 185 , 558 Household cleaning products, 1058 , 1058 f caustics, 1058 –1061 hydrocarbons, 1061 –1062 , 1061 t lead, 1062 –1064 , 1064 t pesticides, 1065 rodenticides, 1065 , 1066 t Housemaid’s knee, 1369 HSV-associated encephalitis, 891 –892 H-type fistulae, 1408 , 1409 f Human immunodeficiency virus (HIV) infection, 153 , 196 , 309 , 315 , 317 , 347 , 419 Humanism, 17 balance of professionalism and, 17 with colleagues and staff, 19 in ED, 18 t via self-care, 19 Human metapneumovirus, 572 Human papilloma virus (HPV), 533 Humeral fractures, 1183 –1184 , 1184 f, 1185 Hutchinson teeth, 350 Hydralazine, 245 Hydration, 298 Hydrocarbons, 1061 –1062 , 1061 t, 1079 Hydroceles, 412 –413 , 413 f, 415 Hydrocephalus, 1385 , 1389 –1390 acute clinical pitfall, 1385 clinical recognition, 1385 diagnostic imaging, 1385 management, 1385 –1386 treatment goals, 1384 –1385 arterial infarcts, 1390 brain abscess, 1389 meningitis, 1389