Groups [6]. Malapposition and underexpansion of stents are associated with Epigenetics complications ?first of all stent thrombosis. Post-dilatation with a non-compliant (NC) balloon as opposed to a stent-mounted semicompliant balloon theoretically assures a more uniform distribution of wall stress and stent expansion and axial stent symmetry indices improve [7]. However, findings deviate and more optimal stent expansion with stent balloons than NC balloons has also been found [8]. The clinical benefit of high pressure post-dilatation remains unclarified and might even result in more intimal hyperplasia compared to a less aggressive approach [9].Stent Inflation PressureTable 1. Baseline characteristics.Baseline characteristicsStents 
– no. ( of total) Age – yr. Mean (6 SD) Female sex – no. ( ) Male sex – no. ( ) Indication – no. ( ) Stable coronary artery disease Unstable coronary artery disease STEMI Other Diabetes mellitus – no. ( ) Insulin treatment Non-insulin treatment Smoking status – no. ( ) Never smoked Former smoker Current smoker Unknown Hyperlipidemia – no. ( ) Hypertension – no. ( )#15 atm 14218 (15.2) 67.3 (11.2) 4188 (29.5) 10030 
(70.5)16?7 atm 16022 (17.1) 67.1 (11.1) 4396 (27.4) 11626 (72.6)18?9 atm 21194 (22.6) 66.9 (11.0) 5576 (26.3) 15618 (73.7)20?1 atm 27129 (29.0) 67.1 (10.8) 6772 (25.0) 20357 (75.0)22 atm 15134 (16.2) 67.3 (10.7) 3735 (24.7) 11399 (75.3)2892 (20.3) 6748 (47.5) 4206 (29.6) 372 (2.6)3585 (22.4) 7864 (49.1) 4208 (26.3) 365 (2.3)5255 (24.8) 10287 (48.5) 5099 (24.1) 563 (2.7)6971 (25.7) 13210 (48.7) 6209 (22.9) 739 (2.7)4175 (27.6) 7173 (47.4) 3360 (22.2) 426 (2.8)1158 (8.1) 1396 (9.8)1350 (8.4) 1681 (10.5)1987 (9.4) 2359 (11.1)2609 (9.6) 3038 (11.2)1556 (10.3) 1761 (11.6)5570 (39.2) 4741 (33.3) 2622 (18.4) 1285 (9.0) 6926 (48.7) 7736 (54.4)6412 (40.0) 5545 (34.6) 3089 (19.3) 976 (6.1) 8014 (50.0) 9047 (56.5) 4359 (27.2) 1511 (9.4)7909 (37.3) 7740 (36.5) 4274 (20.2) 1271 (6.0) 11105 (52.4) 12325 (58.2) 6034 (28.5) 2122 (10.0)10318 (38.0) 10187 (37.6) 5276 (19.4) 1348 (5.0) 14882 (54.9) 16020 (59.1) 7995 (29.5) 3005 (11.1)5646 (37.3) 5895 (39.0) 2933 (19.4) 660 (4.4) 8642 (57.1) 9176 (60.6) 4977 (32.9) 1849 (12.2)Previous myocardial infarction – no. ( ) 3530 (24.8) Previous coronary artery by-pass grafting1327 (9.3) – no. ( )All information in the table is given “per stent”. 23727046 Abbreviations: atm: atmosphere, STEMI: ST-segment elevation myocardial infarction. doi:10.1371/journal.pone.0056348.tReal world data are of paramount importance when different treatment strategies are evaluated. This is especially true for coronary stents, which are very often used “off-label” when the implantation takes place outside the scope of the approved indication. We evaluated death, stent occlusion and restenosis rate in relation to the applied stent pressure in all patients treated by coronary artery stent implantation during 46 months from 2008 and onwards, as Epigenetic Reader Domain recorded in the Swedish Coronary Angiography and Angioplasty Registry (SCAAR).Methods Study populationOur study included all patients in Sweden who had received coronary stents from January 1, 2008, to October 26, 2011. The analyses were based on maximal stent inflation pressure at the first recorded procedure during this time period.registered for patients undergoing any subsequent coronary angiography on a clinical indication since March 1, 2004 and information on stent thrombosis since May 1, 2005. Long-term follow-up was obtained by merging the SCAAR database with other.Groups [6]. Malapposition and underexpansion of stents are associated with complications ?first of all stent thrombosis. Post-dilatation with a non-compliant (NC) balloon as opposed to a stent-mounted semicompliant balloon theoretically assures a more uniform distribution of wall stress and stent expansion and axial stent symmetry indices improve [7]. However, findings deviate and more optimal stent expansion with stent balloons than NC balloons has also been found [8]. The clinical benefit of high pressure post-dilatation remains unclarified and might even result in more intimal hyperplasia compared to a less aggressive approach [9].Stent Inflation PressureTable 1. Baseline characteristics.Baseline characteristicsStents – no. ( of total) Age – yr. Mean (6 SD) Female sex – no. ( ) Male sex – no. ( ) Indication – no. ( ) Stable coronary artery disease Unstable coronary artery disease STEMI Other Diabetes mellitus – no. ( ) Insulin treatment Non-insulin treatment Smoking status – no. ( ) Never smoked Former smoker Current smoker Unknown Hyperlipidemia – no. ( ) Hypertension – no. ( )#15 atm 14218 (15.2) 67.3 (11.2) 4188 (29.5) 10030 (70.5)16?7 atm 16022 (17.1) 67.1 (11.1) 4396 (27.4) 11626 (72.6)18?9 atm 21194 (22.6) 66.9 (11.0) 5576 (26.3) 15618 (73.7)20?1 atm 27129 (29.0) 67.1 (10.8) 6772 (25.0) 20357 (75.0)22 atm 15134 (16.2) 67.3 (10.7) 3735 (24.7) 11399 (75.3)2892 (20.3) 6748 (47.5) 4206 (29.6) 372 (2.6)3585 (22.4) 7864 (49.1) 4208 (26.3) 365 (2.3)5255 (24.8) 10287 (48.5) 5099 (24.1) 563 (2.7)6971 (25.7) 13210 (48.7) 6209 (22.9) 739 (2.7)4175 (27.6) 7173 (47.4) 3360 (22.2) 426 (2.8)1158 (8.1) 1396 (9.8)1350 (8.4) 1681 (10.5)1987 (9.4) 2359 (11.1)2609 (9.6) 3038 (11.2)1556 (10.3) 1761 (11.6)5570 (39.2) 4741 (33.3) 2622 (18.4) 1285 (9.0) 6926 (48.7) 7736 (54.4)6412 (40.0) 5545 (34.6) 3089 (19.3) 976 (6.1) 8014 (50.0) 9047 (56.5) 4359 (27.2) 1511 (9.4)7909 (37.3) 7740 (36.5) 4274 (20.2) 1271 (6.0) 11105 (52.4) 12325 (58.2) 6034 (28.5) 2122 (10.0)10318 (38.0) 10187 (37.6) 5276 (19.4) 1348 (5.0) 14882 (54.9) 16020 (59.1) 7995 (29.5) 3005 (11.1)5646 (37.3) 5895 (39.0) 2933 (19.4) 660 (4.4) 8642 (57.1) 9176 (60.6) 4977 (32.9) 1849 (12.2)Previous myocardial infarction – no. ( ) 3530 (24.8) Previous coronary artery by-pass grafting1327 (9.3) – no. ( )All information in the table is given “per stent”. 23727046 Abbreviations: atm: atmosphere, STEMI: ST-segment elevation myocardial infarction. doi:10.1371/journal.pone.0056348.tReal world data are of paramount importance when different treatment strategies are evaluated. This is especially true for coronary stents, which are very often used “off-label” when the implantation takes place outside the scope of the approved indication. We evaluated death, stent occlusion and restenosis rate in relation to the applied stent pressure in all patients treated by coronary artery stent implantation during 46 months from 2008 and onwards, as recorded in the Swedish Coronary Angiography and Angioplasty Registry (SCAAR).Methods Study populationOur study included all patients in Sweden who had received coronary stents from January 1, 2008, to October 26, 2011. The analyses were based on maximal stent inflation pressure at the first recorded procedure during this time period.registered for patients undergoing any subsequent coronary angiography on a clinical indication since March 1, 2004 and information on stent thrombosis since May 1, 2005. Long-term follow-up was obtained by merging the SCAAR database with other.
