Abstract:
:Resources for clinical research are limited. With increasing demand for patient-centred care, which is growing into an integral component of modern medicine, studying outcomes of patients with specific clinical characteristics is becoming increasingly important. Given the high cost of clinical trials and the time it takes to complete an investigation, it has become compulsory for investigators to assess not only treatment effects between the main randomized groups but also to try to identify clinically relevant subgroups that may particularly benefit from specific treatments. Publications of subgroup analyses turned out to be prevalent, and more importantly, these findings play a significant role in strategic planning and decision-making processes. Therefore, raising awareness among clinicians about the concepts and values of subgroup analysis is an aspect of improving patient outcomes. In this statistical primer, we give a broad introduction to the topic of subgroup analysis in scientific research. We furthermore discuss the concept of subgroup analysis; the motivation for assessing subgroups; the types of subgroup analyses and the paradigm of hypothesis-generating research; the proper statistical methods for the examination of subgroup effects; and the optimal approach for interpretation of results. Finally, this review establishes the comprehensive users' guide for analysing and reporting subgroup studies on a point-by-point basis, using real-world examples that may help readers to gain experience to pursue their own subgroup analyses or interpret those of others.
journal_name
Interact Cardiovasc Thorac Surgjournal_title
Interactive cardiovascular and thoracic surgeryauthors
Milojevic M,Nikolic A,Jüni P,Head SJdoi
10.1093/icvts/ivaa042subject
Has Abstractpub_date
2020-06-01 00:00:00pages
839-845issue
6eissn
1569-9293issn
1569-9285pii
5812146journal_volume
30pub_type
杂志文章,评审abstract:OBJECTIVES:The purposes of this study were to identify possible compression points along the transit route of the subclavian artery and to provide a detailed anatomical analysis of areas that are involved in the surgical management of the thoracic outlet syndrome (TOS). The results of the current study are based on mea...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivy129
更新日期:2018-10-01 00:00:00
abstract::Mitral valve injury due to cardiotomy suckers during aortic valve surgery has never been reported. We highlight the possibility of such injury experienced in our unit. We also discuss its preventive measures. ...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2007.158865
更新日期:2008-02-01 00:00:00
abstract:OBJECTIVES:Transfusions of blood products can be lifesaving, but they are also associated with considerable risks and adverse effects, including immune response and infections. In cardiac surgery, transfusions have also been associated with increased mortality. We prospectively studied the effects of a structured progr...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivu266
更新日期:2014-11-01 00:00:00
abstract::Although surgical outcomes of total arch replacement have improved, the strategy for extended arch aneurysms remains controversial. We have applied the L-incision approach (combination of left anterior thoracotomy and upper half-median sternotomy) for total arch replacement for single-stage repair of extensive arch an...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2011.266791
更新日期:2011-09-01 00:00:00
abstract::It is uncommon to find an iatrogenic foreign body after thoracic surgery. We present a case of migration of a surgical sponge left inadvertently in the mediastinum during a troublesome mediastinoscopy, that migrated into the trachea 6 years later with airway obstruction. The foreign body was extracted through rigid br...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1016/j.icvts.2004.07.015
更新日期:2004-12-01 00:00:00
abstract::A best evidence topic in thoracic surgery was written according to a structured protocol. The question addressed was whether pregabalin could effectively and safely reduce postoperative pain in patients undergoing pulmonary resections. Altogether 23 papers were found using the reported search, of which 6 randomized co...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章,评审
doi:10.1093/icvts/ivz132
更新日期:2019-10-01 00:00:00
abstract::The successful removal of a sewing needle from the heart of a 36-year-old female one year after penetration. ...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2006.138784
更新日期:2006-12-01 00:00:00
abstract::Prompt controlled reperfusion of a pulmonary allograft in a sequential double lung transplant may correct cellular ischemia prior to exposure to full hydrostatic pressures and minimize organ dysfunction. We reviewed the process of a sequential double lung transplant and describe the technique of controlled antegrade g...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2009.211730
更新日期:2009-12-01 00:00:00
abstract::Hoarseness of voice due to recurrent laryngeal nerve palsy is an uncommon manifestation of cardiothoracic disease. Ortner's syndrome is hoarseness attributed to mechanical compression of the left recurrent laryngeal nerve in association with several cardiopulmonary disease states. We here describe a rare case of Ortne...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章,评审
doi:10.1093/icvts/ivx166
更新日期:2017-10-01 00:00:00
abstract::In order to determine anticoagulation strategies in OPCAB a questionnaire survey among 750 European cardio-thoracic surgeons was performed. Questions addressed volume of OPCAB procedures performed, intra- and perioperative heparinization and antiplatelet therapy, as well as perioperative management. A total of 325 (43...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章,多中心研究
doi:10.1510/icvts.2007.169086
更新日期:2008-05-01 00:00:00
abstract::The aim of the study was to determine the incidence of permanent pacemaker implantation (PPMI) in a cohort of 358 patients undergoing transapical aortic valve implantation (TAVI) using a balloon-expandable prosthesis between April 2008 and March 2011. After excluding patients who had had a previous PPMI (n=36; 10%), t...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2011.274456
更新日期:2011-10-01 00:00:00
abstract::There is limited information about the size change of a knitted Dacron graft (Gelseal™) used in the thoracic aorta. We evaluated the diameters of the Gelseal™ grafts at a long-term follow-up for 3.7 ± 1.3 years (1-5.9 years; median, 4.0 years), which were used for replacement of the ascending aorta in 59 patients with...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivr086
更新日期:2012-05-01 00:00:00
abstract::The surgical management of the aortic arch pathologies is controversial. Primary anastomosis and patch aortoplasties combined with end-to-end anastomosis have some complications like recurrence and aneurysm formation. Surgical repair of apical muscular (Swiss-cheese) defects is also still under debate. A 6-year-old pa...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1016/S1569-9293(03)00260-3
更新日期:2004-03-01 00:00:00
abstract:OBJECTIVES:The ability to accurately characterize a pulmonary air leak is an essential skill in chest medicine and surgery. The objective was to evaluate interobserver variability in air leak assessments using analogue and digital pleural drainage systems. METHODS:Air leak severity in lung resection patients with a pu...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivv128
更新日期:2015-10-01 00:00:00
abstract::Shed blood is known to be a source of lipid micro-emboli in cardiac surgery. The aim of this study was to characterize the occurrence of these particles at different stages of the operation, and to study their occurrence in the circulation at multiple time-points after the retransfusion of shed blood. Forty-four patie...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2008.187021
更新日期:2009-05-01 00:00:00
abstract:OBJECTIVES:The objective was to evaluate the long-term haemodynamic performance of the Mosaic aortic bioprosthesis. Secondary objectives were to investigate the long-term survival, the rate of aortic valve reoperations, and the rate of prosthesis-patient mismatch and its effect on long-term survival. METHODS:We includ...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivu238
更新日期:2014-11-01 00:00:00
abstract:OBJECTIVES:Our goal was to present histopathological findings of human explants of a tissue-engineered bovine pericardium CardioCel (Admedus Regen Pty Ltd, Malaga, WA, Australia) used for heart valve repair in patients with congenital and acquired heart valve disease. METHODS:Sixty patients underwent heart valve repai...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivz234
更新日期:2020-01-01 00:00:00
abstract:Objectives:Autologous pericardium, which is widely used in the field of cardiovascular surgery, is usually fixed with glutaraldehyde (GA) to improve handling and provide biomechanical stability. However, an optimal method of GA fixation of autologous pericardium is not known. The objective of this study was to evaluate...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivw356
更新日期:2017-03-01 00:00:00
abstract::Impaired preoperative renal function as estimated by glomerular filtration rate (GFR) is an independent risk factor for mortality after cardiac surgery. Little is known about the actual prevalence of renal dysfunction among patients undergoing cardiac surgery in Germany. We performed a retrospective analysis of 6232 p...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章,多中心研究
doi:10.1510/icvts.2009.208033
更新日期:2009-10-01 00:00:00
abstract:OBJECTIVES:The percutaneous coronary artery angioplasty is routinely being used worldwide for the management of short and discrete coronary artery stenosis. The purpose of this report is to address the potentially lethal complication among the variety of surgical problems in conjunction with this procedure. The case al...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2006.140194
更新日期:2007-02-01 00:00:00
abstract:OBJECTIVES:Congenital supravalvular aortic stenosis (SVAS) is a rare arteriopathy associated with the Williams-Beuren syndrome (WBS) and other elastin gene deletions. Our objective was to review the mid-term outcomes of SVAS repair with extended aortoplasty. METHODS:Congenital SVAS repairs from 2001 to 2010 were retro...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivt236
更新日期:2013-10-01 00:00:00
abstract::A best evidence topic was constructed according to a structured protocol. The question addressed was whether internal iliac artery (IIA) embolization is necessary for achieving the best clinical outcome in all patients when extension of the stent graft to the external iliac artery is required. Altogether more than 400...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章,评审
doi:10.1093/icvts/ivu042
更新日期:2014-06-01 00:00:00
abstract:Objectives:Pulmonary sarcomatoid carcinoma (PSC) is a rare histological subtype of non-small cell lung cancer and comprises a diagnostically and therapeutically challenging group of tumours. We explored the clinicopathological features and prognostic factors of this tumour. Methods:We conducted a retrospective study o...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivw392
更新日期:2017-03-01 00:00:00
abstract::Aortic valve replacement (AVR) is currently the treatment of choice in patients with symptomatic aortic stenosis, but transcatheter off-pump aortic valve implantation is a novel and emerging technique, which might be performed more frequently in the near future and may be a less invasive alternative to conventional AV...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2008.201798
更新日期:2009-06-01 00:00:00
abstract::Coarctation of thoracic aorta is an uncommon diagnosis in adults. Catheter-based intervention consisting of primary ballooning and stenting is becoming one of the methods of choice for the treatment of native coarctation. We describe the case of a young adult with coarctation of the aorta treated unsuccessfully with p...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2010.265264
更新日期:2011-07-01 00:00:00
abstract::Prosthetic graft infection with methicillin-resistant Staphylococcus aureus (MRSA) is one of the most serious complications of cardiovascular surgery. Seeking to prevent graft infection, we evaluated the efficacy of a new biodegradable hydrogel glue (new-glue) composed of aldehyded dextran and epsilon-poly(L-lysine) w...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2010.232447
更新日期:2010-07-01 00:00:00
abstract::The Ross procedure has gained increasing interest for therapy of aortic valve pathologies in young adults because of excellent long-term results. This case report describes the first published experiences of the Ross procedure performed through a minimally invasive access in two consecutive patients. The limited acces...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2009.203067
更新日期:2009-09-01 00:00:00
abstract::Despite technological advances in a newer generation of ventricular assist devices (VAD), complications, such as pump thromboses, remain a significant cause of morbidity and indeed mortality in these patients. We present the case of a 34-year old patient who underwent HeartAssist 5 (HA5) implantation as a bridge to ca...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1093/icvts/ivt066
更新日期:2013-06-01 00:00:00
abstract::A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was: in patients with hypertrophic and keloid scarring of the sternotomy wound, is surgical excision with or without adjuvant treatment of any benefit in reducing the size of the scar? Altogether, more than ...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章,评审
doi:10.1510/icvts.2010.264887
更新日期:2011-10-01 00:00:00
abstract::The objective of this study was to determine the current status of training in cardio-thoracic surgery in Europe and the residents' perception of the effects of the full implementation of the European Working Time Directive (EWTD) on training. We conducted a web-based survey of trainees registered with the European As...
journal_title:Interactive cardiovascular and thoracic surgery
pub_type: 杂志文章
doi:10.1510/icvts.2010.238048
更新日期:2010-09-01 00:00:00