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  • 1.
    Ahlsson, Anders
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden.
    eComment. Postoperative atrial fibrillation: a robust human model of atrial fibrillation genesis?2013In: Interactive Cardiovascular and Thoracic Surgery, ISSN 1569-9293, E-ISSN 1569-9285, Vol. 17, no 4, p. 614-615Article in journal (Refereed)
  • 2.
    Ahlsson, Anders
    et al.
    Örebro University, School of Health and Medical Sciences, Örebro University, Sweden. Örebro University Hospital. Dept Cardiothorac & Vasc Surg, Örebro University Hospital, Örebro, Sweden.
    Fengsrud, Espen
    Dept Cardiol, Örebro University Hospital, Örebro, Sweden.
    Axelsson, Birger
    Örebro University Hospital. Dept Cardiothorac & Vasc Surg, Örebro University Hospital, Örebro, Sweden.
    Positioning of the ablation catheter in total endoscopic ablation2014In: Interactive Cardiovascular and Thoracic Surgery, ISSN 1569-9293, E-ISSN 1569-9285, Vol. 18, no 1, p. 125-127Article in journal (Refereed)
    Abstract [en]

    Minimally invasive ablation of atrial fibrillation is an option in patients not suitable for or refractory to catheter ablation. Total endoscopic ablation can be performed via a monolateral approach, whereby a left atrial box lesion is created. If the ablation is introduced from the right side, the positioning of the ablation catheter on the partly hidden left pulmonary veins is of vital importance. Using thoracoscopy in combination with multiplane transoesophageal echocardiography, the anatomical position of the ablation catheter can be established. Our experience in over 60 procedures has confirmed this to be a safe technique of total endoscopic ablation.

  • 3.
    Ahlsson, Anders
    et al.
    Department of Thoracic and Cardiovascular Surgery, Örebro University Hospital, Örebro, Sweden.
    Sobrosa, Claudio
    Department of Thoracic and Cardiovascular Surgery, Örebro University Hospital, Örebro, Sweden.
    Kaijser, Lennart
    Division of Clinical Physiology and Department of Laboratory Medicine, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden.
    Jansson, Eva
    Division of Clinical Physiology and Department of Laboratory Medicine, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden.
    Bomfim, Vollmer
    Department of Thoracic and Cardiovascular Surgery, Örebro University Hospital, Örebro, Sweden.
    Adenosine in cold blood cardioplegia: a placebo-controlled study2012In: Interactive Cardiovascular and Thoracic Surgery, ISSN 1569-9293, E-ISSN 1569-9285, Vol. 14, no 1, p. 48-55Article in journal (Refereed)
    Abstract [en]

    Objective: Adenosine as an additive in blood cardioplegia is cardioprotective in animal studies, but its clinical role in myocardial protection remains controversial. The aim of this study was to investigate whether the addition of adenosine in continuous cold blood cardioplegia would enhance myocardial protection.

    Methods: In a prospective double-blind study comparing adenosine 400 μmol l(-1) to placebo in continuous cold blood cardioplegia, 80 patients undergoing isolated aortic valve replacement were randomized into four groups: antegrade cardioplegia with adenosine (n = 19), antegrade cardioplegia with placebo (n = 21), retrograde cardioplegia with adenosine (n = 21) and retrograde cardioplegia with placebo (n = 19). Myocardial arteriovenous differences in oxygen and lactate were measured before, during and after aortic occlusion. Myocardial concentrations of adenine nucleotides and lactate were determined from left ventricular biopsies obtained before aortic occlusion, after bolus cardioplegia, at 60 min of aortic occlusion and at 20 min after aortic occlusion. Plasma creatine kinase (CK-MB) and troponin T were measured at 1, 3, 6, 9, 12 and 24 h after aortic occlusion. Haemodynamic profiles were obtained before surgery and 1, 8 and 24 h after cardiopulmonary bypass. Repeated-measures analysis of variance was used for significance testing.

    Results: Adenosine had no effects on myocardial metabolism of oxygen, lactate and adenine nucleotides, postoperative enzyme release or haemodynamic performance. When compared with the antegrade groups, the retrograde groups showed higher myocardial oxygen uptake (17.3 ± 11.4 versus 2.5 ± 3.6 ml l(-1) at 60 min of aortic occlusion, P < 0.001) and lactate accumulation (43.1 ± 20.7 versus 36.3 ± 23.0 µmol g(-1) at 60 min of aortic occlusion, P = 0.052) in the myocardium during aortic occlusion, and lower postoperative left ventricular stroke work index (27.2 ± 8.4 versus 30.1 ± 7.9 g m m(-2), P = 0.034).

    Conclusions: Adenosine 400 μmol l(-1) in cold blood cardioplegia showed no cardioprotective effects on the parameters studied. Myocardial ischaemia was more pronounced in patients receiving retrograde cardioplegia.

  • 4.
    Fengsrud, Espen
    et al.
    Örebro University, School of Medical Sciences. Department of Cardiology.
    Wickbom, Anders
    Örebro University, School of Medical Sciences. Department of Cardiothoracic and Vascular Surgery.
    Almroth, Henrik
    Department of Cardiology, Örebro University, Örebro, Sweden; Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
    Englund, Anders
    Faculty of Medicine and Health, Örebro University, Örebro, Sweden; Arrhythmia Centre, South General Hospital, Stockholm, Sweden.
    Ahlsson, Anders
    Örebro University, School of Medical Sciences. Department of Cardiothoracic and Vascular Surgery.
    Total endoscopic ablation of patients with long-standing persistent atrial fibrillation: a randomized controlled study2016In: Interactive Cardiovascular and Thoracic Surgery, ISSN 1569-9293, E-ISSN 1569-9285, Vol. 23, no 2, p. 292-298Article in journal (Refereed)
    Abstract [en]

    Objectives: Total endoscopic ablation of atrial fibrillation is an alternative to catheter ablation, but its clinical role needs further evaluation. The aim of this study was to compare total endoscopic ablation with rate control in patients with long-standing persistent atrial fibrillation and to examine the effect of endoscopic ablation on heart rhythm, symptoms, physical working capacity and myocardial function during 1 year of follow-up.

    Methods: In a prospective controlled study, 36 patients aged >50 years with symptomatic long-standing persistent atrial fibrillation were randomized to either total endoscopic ablation (n = 17, after two drop-outs before ablation n = 15) or rate control therapy (n = 19). In the ablation group, a box lesion encircling the pulmonary veins was performed, using temperature-controlled radiofrequency energy. Loop recorders were implanted in all patients. Echocardiography and quality-of-life assessment were performed at 6 and 12 months, and physical working capacity assessment at 6 months.

    Results: There was no mortality or thromboembolic event. In the control group, all patients were in permanent atrial fibrillation during 12 months of follow-up. In the ablation group, the proportion of patients in sinus rhythm without antiarrhythmic drugs was 12/15 (80%) at 12 months. The median freedom of atrial fibrillation at 3-12 months was 95% in the ablation group and the proportion of patients with an atrial fibrillation burden of <5% at 3-12 months was 8/15 (53%). The left ventricular ejection fraction increased during follow-up in the ablation group compared with the control group (from 53.7 ± 8.6 to 58.8 ± 6.5%, P = 0.003), combined with a reduction in the left atrial area (from 29.2 ± 5.5 to 27.2 ± 6.3 cm(2), P = 0.002). The physical working capacity increased in the ablation group compared with the control group (from 94 ± 21.4 to 102.9 ± 14.4%, P = 0.011). The subjective physical and mental capacity scale also improved during follow-up in the ablation group, but not in the control group (P =0.003 and 0.018, respectively).

    Conclusions: Total endoscopic ablation in patients with long-standing persistent atrial fibrillation significantly reduced atrial fibrillation burden 12 months after intervention compared with controls. The left ventricular function, physical working capacity and subjective physical and mental health were improved. These results need to be confirmed in larger randomized trials.

  • 5. Friberg, Örjan
    et al.
    Dahlin, Lars-Göran
    Källman, Jan
    Kihlström, Erik
    Söderquist, Bo
    Örebro University, School of Health and Medical Sciences.
    Svedjeholm, Rolf
    Collagen-gentamicin implant for prevention of sternal wound infection: long-term follow-up of effectiveness2009In: Interactive Cardiovascular and Thoracic Surgery, ISSN 1569-9293, E-ISSN 1569-9285, Vol. 9, no 3, p. 454-458Article in journal (Refereed)
    Abstract [en]

    In a previous randomized controlled trial (LOGIP trial) the addition of local collagen-gentamicin reduced the incidence of postoperative sternal wound infections (SWI) compared with intravenous prophylaxis only. Consequently, the technique with local gentamicin was introduced in clinical routine at the two participating centers. The aim of the present study was to re-evaluate the technique regarding the prophylactic effect against SWI and to detect potential shifts in causative microbiological agents over time. All patients in this prospective two-center study received prophylaxis with application of two collagen-gentamicin sponges between the sternal halves in addition to routine intravenous antibiotics. All patients were followed for 60 days postoperatively. From January 2007 to May 2008, 1359 patients were included. The 60-day incidences of any SWI was 3.7% and of deep SWI 1.5% (1.0% mediastinitis). Both superficial and deep SWI were significantly reduced compared with the previous control group (OR=0.34 for deep SWI, P<0.001). There was no increase in the absolute incidence of aminoglycoside resistant agents. The majority of SWI were caused by coagulase-negative staphylococci (CoNS). The incidence of deep SWI caused by Staphylococcus aureus was 0.07%. The results indicate a maintained effect of the prophylaxis over time without absolute increase in aminoglycoside resistance. (ClinicalTrials.gov NCT00484055).

  • 6.
    Samano, Ninos
    et al.
    Örebro University Hospital. Örebro University, School of Medical Sciences. Department of Cardiothoracic and Vascular Surgery, Örebro University Hospital, Örebro, Sweden.
    Bodin, Lennart
    Örebro University, Örebro University School of Business. Intervention and Implementation Research, Institute of Environmental Medicine, Karolinska Institute, Stockholm, Sweden.
    Karlsson, Jan
    Örebro University, School of Medical Sciences. Örebro University Hospital. University Health Care Research Center, Region Örebro County, Örebro, Sweden.
    Geijer, Håkan
    Örebro University, School of Medical Sciences. Örebro University Hospital. Department of Radiology, Örebro University Hospital, Örebro, Sweden.
    Arbeus, Mikael
    Department of Cardiothoracic and Vascular Surgery, Faculty of Health and Medical Sciences, Örebro University, Örebro, Sweden.
    Souza, Domingos
    Örebro University Hospital. Department of Cardiothoracic and Vascular Surgery, Örebro University Hospital, Örebro, Sweden.
    Graft patency is associated with higher health-related quality of life after coronary artery bypass surgery2016In: Interactive Cardiovascular and Thoracic Surgery, ISSN 1569-9293, E-ISSN 1569-9285, Vol. 24, no 3, p. 388-394Article in journal (Refereed)
    Abstract [en]

    Objectives: The objective of this study was to investigate whether graft patency was associated with higher health-related quality of life in coronary artery bypass grafting patients and to compare this study with the general Swedish population.

    Methods: Patients were included from 3 randomized trials and 1 prospective cohort trial. The generic health-related quality of life instrument, EQ-5D (VAS and index) was used. Graft patency was assessed with computed tomography angiography. Patients were divided into 2 groups according to the number of occluded distal anastomosis: Group I with no to 1 occlusion (n = 209) and Group II with 2 to 4 occlusions (n = 24).

    Results: Two hundred and thirty-three patients underwent computed tomography angiography at a mean of 7.5 (1-18) years post-operatively. The mean difference in EQ-VAS and EQ-5D index between Groups II and I after model adjustment was -19.8 (95% CI -25.3 to -14.3; P < 0.001) and -0.13 (95% CI -0.19 to -0.08; P < 0.001), respectively. The EQ-5D index for the study population was similar compared with the Swedish population, 0.851 and 0.832, respectively, with an effect-size of 0.112 (trivial). The EQ-5D index of the study population was higher compared with the ischemic heart disease group in the Swedish population, 0.851 vs 0.60, with an effect-size of 0.999 (large).

    Conclusion: Graft patency was associated with higher health-related quality of life in coronary artery bypass patients. This patient group reported similar function and wellbeing compared to the general Swedish population and better health status than those in the same disease group in the general population.

    Clinical registration number: Clinicaltrials.gov: NCT02547194 and the Research and Development registry in Sweden: 167861.

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