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'microvascular': [276, 334, 345, 861, 1429, 1471, 1518, 1539, 1593, 1617, 1638], 'angina': [277, 307, 346, 707, 732, 741, 822, 955, 1009, 1398], 'showed': [278, 926], 'excellent': [279, 867], 'prognosis': [280, 869, 1275], 'despite': [281], 'frequent': [282], 'recurrence': [283], 'symptoms.1,2': [285], 'Recent': [286], 'large': [287, 329], 'challenged': [289], 'this': [290, 319, 338, 845, 1058], 'view,': [291], 'however,': [292, 964, 1040], 'reporting': [293, 737], 'a': [294, 327, 619, 933, 1028, 1033, 1049, 1355], 'sizeable': [295], 'rate': [296, 935], 'major': [298, 467, 1412], 'adverse': [299, 1153, 1413], 'cardiovascular': [300, 395, 468, 1137, 1154, 1346, 1414], 'events': [301, 450, 469, 877], '(MACE)': [302], 'in': [303, 337, 349, 408, 563, 602, 653, 673, 682, 685, 688, 693, 878, 904, 940, 954, 1065, 1348, 1473, 1548, 1579, 1633, 1730], 'no': [309, 374, 1014, 1401, 1582], 'obstructive': [310, 669, 927, 1402, 1476, 1583], 'coronary': [311, 371, 384, 464, 484, 525, 631, 666, 679, 916, 928, 937, 959, 973, 1102, 1352, 1403, 1428, 1470, 1477, 1584, 1592], 'artery': [312, 929, 960, 1103, 1353, 1404, 1585], 'disease.3,4': [313], 'To': [314], 'get': [315], 'further': [316], 'insight': [317], 'into': [318], 'clinical': [320, 350, 422, 445, 512, 593, 850, 1070, 1304, 1431, 1523], 'controversy,': [321], 'we': [322], 'performed': [323, 352], 'long-term': [324, 868, 993], 'follow-up': [325, 598, 621, 690, 855, 1206, 1311], 'rather': [328], 'population': [330, 606, 898], 'angina.We': [335], 'included': [336, 451, 562, 607, 965], 'study': [339, 851], 'all': [340], 'who': [347, 677, 914], 'participated': [348], 'investigations': [351], 'at': [353, 558, 749, 759, 823, 984, 1016, 1063, 1080, 1083, 1232], 'our': [354, 415, 843, 989], 'institute': [355], 'between': [356], '1991': [357], '2011.': [359], 'All': [360, 400], 'had': [362], 'exercise-induced': [363], 'angina,': [364, 463, 532, 1169], 'positive': [365], 'exercise': [366], 'stress': [367], 'test,': [368], 'angiographically': [369], 'normal': [370], 'arteries,': [372], 'other': [375, 466], 'relevant': [376], 'cardiac': [377, 455, 901, 1279], 'or': [378, 424, 461, 498], 'systemic': [379], 'disease.5': [380], 'In': [381, 428], 'suspected': [382], 'cases,': [383], 'spasm': [385], 'was': [386, 412, 419, 435, 545, 612, 691, 720, 1032, 1041], 'excluded': [387], 'by': [388, 414, 421, 547, 710, 722], 'ergonovine': [389], 'test.Patients': [390], 'were': [391, 488, 503, 561, 567, 633, 671, 708, 752, 1022], 'carefully': [392], 'characterized': [393], 'for': [394, 531, 614, 706, 787, 802, 816, 835, 1168], 'risk': [396, 884, 1095], 'factors': [397], 'symptoms.': [399], 'gave': [402], 'their': [403, 493, 1068], 'informed': [404], 'consent': [405], 'participate': [407], 'the': [409, 429, 510, 603, 756, 840, 848, 853, 879, 896, 1358, 1365, 1541, 1545, 1641, 1735], 'study,': [410], 'which': [411], 'approved': [413], 'institutional': [416], 'review': [417], 'board.Follow-up': [418], 'done': [420], 'visits': [423], 'structured': [425], 'telephone': [426], 'interview.': [427], 'case': [430], 'death,': [432, 456, 521, 1046], 'its': [433], 'cause': [434], 'established': [436], 'from': [437, 945, 1357], 'interview': [438], "patient's": [440], 'relatives': [441], 'and,': [442], 'when': [443], 'necessary,': [444], 'records': [446], 'death': [448], 'certificates.Clinical': [449], 'total,': [452, 628], 'cardiovascular,': [453, 629], 'nonfatal': [457, 1136], 'acute': [458, 522], 'myocardial': [459, 523, 1142], 'infarction': [460], 'unstable': [462], 'revascularization,': [465], '(stroke,': [470], 'transient': [471], 'ischemic': [472, 1146], 'attack,': [473], 'pulmonary': [474], 'embolism,': [475], 'etc),': [476], 'emergency': [477, 528, 702, 817], 'room': [478, 529, 703, 818, 1173], 'access,': [479], 'hospital': [480], 'admission,': [481], 'repeat': [483], 'angiography.': [485], 'Finally,': [486], 'asked': [489], 'report': [491, 1356], 'whether': [492], 'symptoms': [494, 719, 1015], 'improved,': [495], 'remained': [496], 'unchanged,': [497], 'worsened': [499], 'over': [500], 'time.': [501], 'Data': [502, 566, 1082], 'also': [504, 753, 931, 997, 1042], 'analyzed': [505, 568], 'identify': [507], 'predictors': [508], 'following': [511], 'end': [513, 543, 580, 747, 757, 1037], 'points:': [514], '(1)': [515, 765], 'total': [516, 788], 'mortality,': [517], '(2)': [518, 790], 'MACE': [519, 651, 953], '(cardiovascular': [520], 'infarction,': [524], 'revascularization),': [526], '(3)': [527, 804], 'access': [530], '(4)': [534, 821], 'lack': [535, 836], 'symptom': [537, 838, 1059], 'improvement.The': [538], 'association': [539, 576], 'variables': [541, 578, 763], 'points': [544, 581], 'tested': [546], 'univariable': [548, 559, 750], 'multivariable': [550, 564, 575, 760], 'Cox': [551], 'regression': [552], 'analysis.': [553, 761], 'Variables': [554], 'showing': [555], '2-sided': [556], 'P<0.1': [557], 'analysis': [560, 751], 'models.': [565], 'SPSS': [570], '21.0': [571], '(SPSS': [572], 'Italia).': [573], 'The': [574, 605], 'is': [582, 847, 981, 1230, 1406, 1640], 'reported': [583, 709, 721, 729, 949, 1006, 1013], 'as': [584], 'hazard': [585], 'ratio': [586], '(HR)': [587], '95%': [589], 'confidence': [590], 'interval': [591], '(CI).Basal': [592], 'data': [594, 864, 894, 943, 990], 'results': [599], 'are': [600], 'summarized': [601], 'Table.': [604], '250': [608], 'patients.': [609], 'Vital': [610], 'state': [611], 'ascertained': [613], '240': [615, 1191], '(96%).': [617], 'At': [618], 'median': [620], '16.0': [623], 'years': [624], '(interquartile': [625], 'interval,': [626], '12–21),': [627], 'mortality': [632, 902], '10.8%,': [634], '3.75%,': [635], '0.83%,': [637], 'respectively': [638], '(annual': [639], 'rates,': [640], '0.68%,': [641], '0.23%,': [642], '0.05%,': [644], 'respectively).Among': [645], '207': [646, 1195], 'appropriate': [649, 924, 1198], 'data,': [650], 'occurred': [652], '17.9%': [654], '(1.12%': [655], 'per': [656, 768, 886], 'year).': [657], 'Sixty-five': [658], 'these': [660, 871, 941], '(31.4%)': [662], 'underwent': [663, 678], '≥1': [664], 'new': [665], 'angiograms,': [667], 'stenoses': [670], 'found': [672, 1002], '11': [674, 919], '(5.3%)': [676], 'revascularization': [680], '(percutaneous': [681], '9,': [683], 'surgical': [684], '1,': [686], 'both': [687], '1).Full': [689], 'obtained': [692], '181': [694, 1202], '224': [696], 'living': [697], '(80.8%).': [699], 'Access': [700], 'rehospitalization': [705], '56.9%': [711], '37.6%': [713], 'patients,': [715, 872], 'respectively.': [716], 'Worsening': [717], '12': [723], '(6.6%),': [725], 'whereas': [726], '127': [727], '(70.2%)': [728], 'reduction': [730, 1007], 'episodes,': [733, 1010], '30': [735], '(16.6%)': [736], 'absence': [738, 1474], 'any': [740], 'attack.Variables': [742], 'predictive': [743, 754], 'an': [745, 866], 'individual': [746], 'point': [748, 758], 'These': [762, 962], 'included:': [764], 'age': [766, 791, 805, 1019], '(HR': [767], '1-year': [769], 'increments,': [770], '1.14;': [771], 'CI,': [772, 777, 785, 794, 800, 808, 814, 827, 833], '1.08–1.20),': [773], 'smoking': [774, 797, 1021], '(HR,': [775, 783, 792, 798, 806, 812, 825, 831], '2.95;': [776], '1.09–8.00)': [778], 'history': [780, 1029, 1100], 'dyspnea': [782, 811, 830, 1031], '0.13;': [784], '0.02–0.97)': [786], 'mortality;': [789], '1.08;': [793], '1.03–1.12)': [795], '3.13;': [799], '1.29–7.63)': [801], 'MACE;': [803], '1.04;': [807], '1.01–1.06)': [809], '1.55;': [813], '1.04–2.31)': [815], 'access;': [819], 'rest': [824], '2.20;': [826], '1.21–4.01)': [828], '1.87;': [832], '1.07–3.24)': [834], 'improvement.To': [839], 'best': [841], 'knowledge,': [844], 'work': [846], 'largest': [849], 'longest': [854], 'angina.': [862], 'Our': [863], 'show': [865, 991], 'rates': [874, 903, 951], 'fatal': [876], 'range': [880], 'very': [882], 'low': [883, 934], '(<1%': [885], 'year)': [887], 'lower': [889], 'than': [890, 1000], 'expected': [891], 'according': [892], 'Italian': [897], '(total': [899], '2012': [905], '0.92%': [907], '0.18%,': [909], 'respectively).Moreover,': [910], '65': [912], 'repeated': [915], 'angiography,': [917], 'only': [918, 1018], '(5.3%': [920], 'data)': [925], 'disease,': [930], 'suggesting': [932, 1047], 'atherosclerosis': [938], 'progression': [939], 'patients.Our': [942], 'differ': [944], 'recent': [946, 1520], 'that': [948, 983, 992, 1048], 'significant': [950], 'nonobstructive': [958, 1351], 'disease.2,3': [961], 'studies,': [963], 'heterogeneous': [966], 'populations,': [967], 'possibly': [970], 'having': [971], 'subcritical': [972], 'atherosclerosis,': [974, 1478], 'arrhythmias,': [975], 'reduced': [977], 'left': [978, 1307], 'ventricular': [979, 1308], 'function.It': [980], 'notable': [982], 'variance': [985], 'previous': [987], 'findings,1,2': [988], 'symptomatic': [994], 'outcome': [995], 'can': [996], 'be': [998], 'better': [999, 1069], 'previously': [1001], 'because': [1003], 'most': [1004], '17%': [1012], 'all.Although': [1017], 'independently': [1023], 'associated': [1024, 1407], 'hard': [1026], 'events,': [1027, 1126, 1138], 'predictor': [1034], 'symptom-related': [1036], 'points.': [1038], 'Dyspnea,': [1039], 'inversely': [1043], 'related': [1044], 'closer': [1050], 'medical': [1051], 'observation': [1052], 'management': [1054], 'might': [1060], 'have': [1061], 'contributed,': [1062], 'least': [1064], 'part,': [1066], 'outcome.Table.': [1071], 'Main': [1072], 'Characteristics': [1074], 'Patients': [1076], 'Events': [1079], 'Follow-UpClinical': [1081], 'Enrollment': [1084], '(n=250)': [1085], 'Age': [1086], '(y,': [1087], 'mean±SD)55.5±9': [1088], 'Female': [1089], 'sex,': [1090], 'n': [1091, 1097, 1119, 1127, 1139, 1170, 1181], '(%)182': [1092], '(72.8)': [1093], 'Cardiovascular': [1094, 1132, 1481, 1549], 'factors,': [1096], '(%)': [1098, 1120, 1128], 'Family': [1099], 'disease64': [1104], '(25.6)': [1105], 'Hypertension147': [1106], '(58.8)': [1107], 'Hypercholesterolemia122': [1108], '(48.8)': [1109], 'Obesity30': [1110], '(12.0)': [1111], 'Diabetes': [1112], 'mellitus36': [1113], '(14.4)': [1114], 'Smoking22': [1115], '(8.8)': [1116], 'Associated': [1117], 'symptoms,': [1118], 'Rest': [1121], 'angina42': [1122], '(16.8)': [1123], 'Dyspnea80': [1124], '(32.0)Clinical': [1125], 'Total': [1129], 'deaths*26': [1130], '(10.8)': [1131], 'deaths*9': [1133], '(3.75)': [1134], 'Major': [1135, 1152], '(%)†': [1140], 'Acute': [1141], 'infarction8': [1143], '(3.9)': [1144], 'Stroke/transient': [1145], 'attack14': [1147], '(6.8)': [1148], 'Coronary': [1149, 1157, 1538, 1595, 1616, 1724, 1727], 'revascularization11': [1150], '(5.3)': [1151, 1162], 'events†37': [1155], '(17.9)': [1156], 'angiography†65': [1158], '(31.4)': [1159], 'Obstructive': [1160], 'stenosis11': [1161], 'Nonobstructive': [1163], 'stenosis12': [1164], '(5.8)': [1165], 'Hospital': [1166, 1176], 'referral': [1167], '(%)§': [1171, 1182], 'Emergency': [1172], 'access103': [1174], '(56.9)': [1175], 'admission68': [1177], '(37.6)': [1178], 'status,': [1180], 'Improved127': [1183], '(70.2)': [1184], 'Unchanged42': [1185], '(23.2)': [1186], 'Worsened12': [1187], '(6.6)*Data': [1188], 'referred': [1189, 1193, 1200], 'patients.†Data': [1192], 'data.§Data': [1199], 'full': [1205], 'assessment.Gaetano': [1207], 'MDMonica': [1210], 'MDAntonio': [1212], 'MDPriscilla': [1215], 'MDAngelo': [1217], 'MDFrancesco': [1219], 'MDMichele': [1221], 'MDElisabetta': [1223], 'MDAlessia': [1225], 'MDFilippo': [1227], 'MDDisclosuresNone.FootnotesCirculation': [1229], 'available': [1231], 'http://circ.ahajournals.org.Correspondence': [1233], 'to:': [1234], 'Istituto': [1239], 'di': [1240], 'Cardiologia,': [1241], 'Largo': [1247], '8,': [1250], '00168': [1251], 'E-mail': [1254], '[email': [1255], 'protected]References1.': [1256], 'P,': [1258, 1294, 1296], 'GA,': [1260, 1264, 1424], 'Spinelli': [1261], 'A,': [1262, 1267, 1271, 1298, 1382, 1450, 1458, 1497, 1507, 1561, 1569, 1610, 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'Jørgensen': [1391], 'E,': [1392, 1501], 'Kelbæk': [1393], 'H,': [1394], 'Prescott': [1395], 'E.': [1396], 'pectoris': [1399], 'disease': [1405], 'increased': [1409], 'risks': [1410], 'events.Eur': [1415], 'J.': [1417], '2012;': [1418], '33:734–744.': [1419], '10.1093/eurheartj/ehr331.CrossrefMedlineGoogle': [1421], 'Scholar5.': [1422], 'Primary': [1427], 'dysfunction:': [1430], 'presentation,': [1432], 'pathophysiology,': [1433], 'management.Circulation.': [1435], '121:2317–2325.': [1437], '10.1161/CIRCULATIONAHA.109.900191.LinkGoogle': [1439], 'Scholar': [1440], 'Previous': [1441], 'Back': [1442], 'top': [1444], 'Next': [1445], 'FiguresReferencesRelatedDetailsCited': [1446], 'By': [1447], 'Pizzi': [1451], 'Tritto': [1453], 'Morrone': [1455], 'D,': [1456, 1491], 'Bergamaschi': [1459], 'L': [1460], 'G': [1463, 1509], '(2022)': [1464], 'dysfunction': [1472], 'Journal': [1479, 1647, 1733], 'Medicine,': [1482, 1550], '10.2459/JCM.0000000000001305,': [1483], 'Publish': [1484], 'Ahead': [1485], 'Print': [1487], 'Masi': [1488], 'Rizzoni': [1490], 'Taddei': [1492], 'Widmer': [1494], 'R,': [1495, 1503], 'Montezano': [1496], 'Lüscher': [1498], 'T,': [1499], 'Schiffrin': [1500], 'Touyz': [1502], 'Paneni': [1504], 'Lerman': [1506], 'Virdis': [1511], 'A': [1512, 1576, 1615, 1698], '(2020)': [1513, 1577], 'Assessment': [1514], 'pathophysiology': [1516], 'progress': [1521], 'implications,': [1524], 'European': [1525, 1645], 'Journal,': [1527, 1689], '10.1093/eurheartj/ehaa857,': [1528], '42:26,': [1529], '(2590-2604),': [1530], 'Online': [1531, 1552, 1601, 1658, 1743], 'publication': [1532, 1553, 1602, 1659, 1744], 'date:': [1533, 1554, 1603, 1660, 1745], '8-Jul-2021.': [1534], 'Dzeshka': [1535], 'M': [1536], '(2021)': [1537], 'dysfunction–Exploring': [1540], 'hidden': [1542], 'part': [1543], 'iceberg,': [1546], 'Trends': [1547], '10.1016/j.tcm.2021.08.013,': [1551], '1-Aug-2021.': [1555], 'Sucato': [1556, 1605], 'V,': [1557, 1606], 'Novo': [1558, 1570, 1607], 'G,': [1559, 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