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1.
Int J Vasc Med ; 2021: 7439173, 2021.
Article in English | MEDLINE | ID: mdl-34646581

ABSTRACT

INTRODUCTION: This study analyzed the patient outcomes following endovascular aortic aneurysm repair (EVAR) for infrarenal aortic pathologies with very narrow aortic bifurcations using the AFX stent graft. METHODS: The data was retrieved from the archived medical records of 35 patients treated for abdominal aortic aneurysm (AAA) (48.6%) or penetrating aortic ulcer (PAU) (51.4%) with very narrow aortic bifurcation between January 2013 and May 2020. Patient survival, freedom from endoleak (EL), and limb occlusion were estimated applying the Kaplan-Meier method. RESULTS: The mean follow-up time was 20.4 ± 22.8 months. The mean aortic bifurcation diameter was 15.8 ± 2.2 mm. Technical success was 100%, and no procedure-related deaths occurred. Two type II ELs occurred within 30-day follow-up. We observed one common iliac artery stenosis at four months and one type III EL at 54 months in the same patient, both of which required re-intervention. Overall patient survival was 95 ± 5% (AAA: 100%; PAU: 89 ± 10%), freedom from limb occlusion was 94 ± 5% (AAA: 91 ± 9%; PAU: 100%), freedom from type II EL was 94 ± 4% (AAA: 88 ± 8%; PAU: 100%), and freedom from EL type III was 83 ± 15% (AAA: 80 ± 18%; PAU: 100%) at the end of the follow-up period. CONCLUSIONS: Very narrow aortic bifurcations may predispose patients to procedure-related complications following EVAR. Our results suggest a safe use of the AFX stent graft in such scenarios. The overall short- and long-term procedure-related patient outcomes are satisfying albeit they may seem superior for PAU when compared to AAA.

2.
Br J Dermatol ; 184(4): 617-626, 2021 04.
Article in English | MEDLINE | ID: mdl-32510579

ABSTRACT

In order to overcome inconsistencies in the reporting of outcomes in clinical trials, core outcome sets (COSs) have been developed in many clinical areas and the awareness of this concept is growing steadily. The Outcomes for Pressure Ulcer Trials (OUTPUTs) project aims to improve the quality of evidence from pressure ulcer prevention trials by developing a COS. As an initial step in the COS process we aimed to identify and classify both outcomes and concepts that represent potential outcomes for future trials that have been reported in pressure ulcer prevention research. A review was conducted in 12 major databases covering the literature indexed until 2016. Outcomes and relevant concepts reported in primary studies and/or reviews on pressure ulcer prevention in adult patients were extracted as presented in the articles, and afterwards inductively grouped into outcome domains. The domains were then categorized according to the outcome domain taxonomy recently proposed by the COMET group. In total 332 studies were included and 68 outcome domains were identified, covering multiple aspects of pressure ulcer prevention. Pressure ulcer occurrence was reported in 71% of all included studies, representing the most frequent outcome, followed by costs (22% of all studies) and acceptability of intervention and comfort (18% of all studies). A plethora of different outcomes are applied in pressure ulcer prevention research and substantial variations in definitions and reporting of similar outcomes were observed. A COS for pressure ulcer prevention trials is needed to overcome the noncomparability of outcomes.


Subject(s)
Pressure Ulcer , Databases, Factual , Humans , Pressure Ulcer/prevention & control , Publications , Skin Care
5.
Br J Dermatol ; 178(4): e279-e285, 2018 04.
Article in English | MEDLINE | ID: mdl-29441525

ABSTRACT

Results of clinical trials are the most important information source for generating external clinical evidence. The use of different outcomes across trials, which investigate similar interventions for similar patient groups, significantly limits the interpretation, comparability and clinical application of trial results. Core outcome sets (COSs) aim to overcome this limitation. A COS is an agreed standardized collection of outcomes that should be measured and reported in all clinical trials for a specific clinical condition. The Core Outcome Set Initiative within the Cochrane Skin Group (CSG-COUSIN) supports the development of core outcomes in dermatology. In the second CSG-COUSIN meeting held in 2017, 11 COS development groups working on skin diseases presented their current work. The presentations and discussions identified the following overarching methodological challenges for COS development in dermatology: it is not always easy to define the disease focus of a COS; the optimal method for outcome domain identification and level of detail needed to specify such domains is challenging to many; decision rules within Delphi surveys need to be improved; appropriate ways of patient involvement are not always clear. In addition, there appear to be outcome domains that may be relevant as potential core outcome domains for the majority of skin diseases. The close collaboration between methodologists in the Core Outcome Set Initiative and the international Cochrane Skin Group has major advantages for trialists, systematic reviewers and COS developers.


Subject(s)
Clinical Trials as Topic/standards , Dermatology/standards , Outcome Assessment, Health Care/standards , Decision Making , Humans , Interprofessional Relations
6.
Geburtshilfe Frauenheilkd ; 75(8): 792-807, 2015 Aug.
Article in English | MEDLINE | ID: mdl-26365999

ABSTRACT

Purpose: Official guideline published and coordinated by the German Society of Gynecology and Obstetrics (DGGG). Positioning injuries after lengthy gynecological procedures are rare, but the associated complications can be potentially serious for patients. Moreover, such injuries often lead to claims of malpractice and negligence requiring detailed medical investigation. To date, there are no binding evidence-based recommendations for the prevention of such injuries. Methods: This S1-guideline is the work of an interdisciplinary group of experts from a range of different professions who were commissioned by DGGG to carry out a systematic literature search of positioning injuries. Members of the participating scientific societies develop a consensus in an informal procedure. Afterwards the directorate of the scientific society approves the consensus. The recommendations cover.

7.
Nat Commun ; 6: 6708, 2015 Mar 30.
Article in English | MEDLINE | ID: mdl-25819547

ABSTRACT

The strongest interaction between microscopic spins in magnetic materials is the exchange interaction Jex. Therefore, ultrafast control of Jex holds the promise to control spins on ultimately fast timescales. We demonstrate that time-periodic modulation of the electronic structure by electric fields can be used to reversibly control Jex on ultrafast timescales in extended antiferromagnetic Mott insulators. In the regime of weak driving strength, we find that Jex can be enhanced and reduced for frequencies below and above the Mott gap, respectively. Moreover, for strong driving strength, even the sign of Jex can be reversed and we show that this causes time reversal of the associated quantum spin dynamics. These results suggest wide applications, not only to control magnetism in condensed matter systems, for example, via the excitation of spin resonances, but also to assess fundamental questions concerning the reversibility of the quantum many-body dynamics in cold atom systems.

8.
Eur J Vasc Endovasc Surg ; 47(5): 509-16, 2014 May.
Article in English | MEDLINE | ID: mdl-24583096

ABSTRACT

OBJECTIVES: This retrospective study presents the early and late results of pediatric patients who underwent reconstructive surgery for renovascular hypertension (RVH) between 1979 and 2009. METHODS: From 1979 to 2009 44 patients (male 22; mean age 13±5.2 years, range 1-19 years; early childhood 7 [1-6 years], middle childhood 5 [7-10 years]; adolescents 32 [11-19 years]) with renovascular hypertension underwent surgery for abdominal aortic stenoses (n=6), renal artery stenosis (RAS) (n=25) or for combined lesions (n=13). Nineteen aortic stenoses (bypass/interposition 10/5, patch dilatation/thromboendarterectomy 2/2), 51 renal arteries (interposition 36, resection+reimplantation 13, patch dilatation/aneurysmorraphy 1 each), and 10 visceral arteries (resection+reimplantation 6, interposition 3, patch dilatation 1) were reconstructed. Each patient underwent duplex studies and if required intra-arterial digital subtraction angiography. Reoperations within 30 postoperative days were required in four (9%) of the patients for occlusion of four arteries (6%), achieving a combined technical success rate of 94%. RESULTS: After 114±81 months 36 patients were re-examined by duplex and magnetic resonance angiography (2 not surgery-related deaths 7/12 years postoperatively, 8 patients lived abroad). Twelve patients had required a second and three a third procedure. Hypertension was cured early/late postoperatively in 27%/56%, improved in 41%/44%, and remained unchanged in 32%/0%. Best late results were obtained in patients with isolated aortic disease and at the age of middle childhood. CONCLUSIONS: Reconstructive surgery for pediatric RVH yields good results at every age and every type of lesion. However, these children should be followed up closely and to avoid early cardiovascular disease and death in later life, surgery should not be delayed.


Subject(s)
Aortic Diseases/complications , Fibromuscular Dysplasia/complications , Hypertension, Renovascular/surgery , Plastic Surgery Procedures/methods , Renal Artery Obstruction/complications , Renal Artery/surgery , Vascular Surgical Procedures/methods , Adolescent , Angiography, Digital Subtraction , Aortic Diseases/diagnosis , Blood Pressure , Child , Child, Preschool , Diagnosis, Differential , Female , Fibromuscular Dysplasia/diagnosis , Follow-Up Studies , Humans , Hypertension, Renovascular/diagnosis , Hypertension, Renovascular/etiology , Infant , Magnetic Resonance Angiography , Male , Renal Artery Obstruction/diagnosis , Renal Artery Obstruction/surgery , Retrospective Studies , Syndrome , Time Factors , Treatment Outcome , Young Adult
9.
Int J Nurs Stud ; 51(5): 703-16, 2014 May.
Article in English | MEDLINE | ID: mdl-24161740

ABSTRACT

BACKGROUND: Nurses' clinical judgement plays a vital role in pressure ulcer risk assessment, but evidence is lacking which patient characteristics are important for nurses' perception of patients' risk exposure. OBJECTIVES: To explore which patient characteristics nurses employ when assessing pressure ulcer risk without use of a risk assessment scale. DESIGN: Mixed methods design triangulating observational data from the control group of a quasi-experimental trial and data from semi-structured interviews with nurses. SETTING: Two traumatological wards at a university hospital. PARTICIPANTS: Quantitative data: A consecutive sample of 106 patients matching the eligibility criteria (age ≥ 18 years, no pressure ulcers category ≥ 2 at admission and ≥ 5 days expected length of stay). Qualitative data: A purposive sample of 16 nurses. METHODS: Quantitative data: Predictor variables for pressure ulcer risk were measured by study assistants at the bedside each second day. Concurrently, nurses documented their clinical judgement on patients' pressure ulcer risk by means of a 4-step global judgement scale. Bivariate correlations between predictor variables and nurses' risk estimates were established. Qualitative data: In interviews, nurses were asked to assess fictitious patients' pressure ulcer risk and to justify their risk estimates. Patient characteristics perceived as relevant for nurses' judements were thematically clustered. Triangulation: Firstly, predictors of nurses' risk estimates identified in bivariate analysis were cross-mapped with interview findings. Secondly, three models to predict nurses' risk estimates underwent multiple linear regression analysis. RESULTS: Nurses consider multiple patient characteristics for pressure ulcer risk assessment, but regard some conditions more important than others. Triangulation showed that these are measures reflecting patients' exposure to pressure or overall care dependency. Qualitative data furthermore indicate that nurses are likely to trade off risk-enhancing conditions against conditions perceived to be protective. Here, patients' mental capabilities like willingness to engage in one owns care seem to be particularly important. Due to missing information on these variables in the quantitative data, they could not be incorporated into triangulation. CONCLUSIONS: Nurses' clinical judgement draws on well-known aetiological factors, and tends to expand conditions covered by risk assessment scales. Patients' care dependency and self-care abilities seem to be core concepts for nurses' risk assessment.


Subject(s)
Nursing Assessment , Pressure Ulcer/nursing , Adult , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Pressure Ulcer/epidemiology , Pressure Ulcer/prevention & control , Risk Assessment
10.
Int J Nurs Stud ; 50(8): 1136-50, 2013 Aug.
Article in English | MEDLINE | ID: mdl-23540571

ABSTRACT

For decades various pressure ulcer risk assessment scales (PURAS) have been developed and implemented into nursing practice despite uncertainty whether use of these tools helps to prevent pressure ulcers. According to current methodological standards, randomised controlled trials (RCTs) are required to conclusively determine the clinical efficacy and safety of this risk assessment strategy. In these trials, PURAS-aided risk assessment has to be compared to nurses' clinical judgment alone in terms of its impact on pressure ulcer incidence and adverse outcomes. However, RCTs evaluating diagnostic procedures are prone to specific risks of bias and threats to the statistical power which may challenge their validity and feasibility. This discussion paper critically reflects on the rigour and feasibility of experimental research needed to substantiate the clinical efficacy of PURAS-aided risk assessment. Based on reflections of the methodological literature, a critical appraisal of available trials on this subject and an analysis of a protocol developed for a methodologically robust cluster-RCT, this paper arrives at the following conclusions: First, available trials do not provide reliable estimates of the impact of PURAS-aided risk assessment on pressure ulcer incidence compared to nurses' clinical judgement alone due to serious risks of bias and insufficient sample size. Second, it seems infeasible to assess this impact by means of rigorous experimental studies since sample size would become extremely high if likely threats to validity and power are properly taken into account. Third, means of evidence linkages seem to currently be the most promising approaches for evaluating the clinical efficacy and safety of PURAS-aided risk assessment. With this kind of secondary research, the downstream effect of use of PURAS on pressure ulcer incidence could be modelled by combining best available evidence for single parts of this pathway. However, to yield reliable modelling results, more robust experimental research evaluating specific parts of the pressure ulcer risk assessment-prevention pathway is needed.


Subject(s)
Pressure Ulcer/prevention & control , Humans , Pressure Ulcer/epidemiology , Pressure Ulcer/nursing , Risk Assessment
12.
Vasa ; 40(5): 359-67, 2011 Sep.
Article in English | MEDLINE | ID: mdl-21948778

ABSTRACT

Surgery in chronic peripheral arterial disease (PAD) can alleviate symptoms in claudicants and may impede amputation in critical limb ischemia. The current data on different surgical strategies and techniques from the aortoiliac region to the pedal arteries as well as amputation as last resort are described and discussed. Treatment of PAD depends on the condition of the patient and his comorbidities. The question of optimal therapy for each patient cannot always be answered in the operating theatre or the angio-suite.


Subject(s)
Peripheral Arterial Disease/surgery , Vascular Surgical Procedures , Amputation, Surgical , Chronic Disease , Critical Illness , Humans , Intermittent Claudication/etiology , Intermittent Claudication/surgery , Ischemia/etiology , Ischemia/surgery , Limb Salvage , Peripheral Arterial Disease/complications , Peripheral Arterial Disease/diagnosis , Reoperation , Treatment Outcome
13.
Zentralbl Chir ; 135(5): 438-44, 2010 Oct.
Article in German | MEDLINE | ID: mdl-20645250

ABSTRACT

BACKGROUND: Coral reef aorta (CRA) is described as rock-hard calcifications in the visceral part of the aorta. These heavily calcified plaques grow into the lumen and can cause significant stenoses, leading to malperfusion of the lower limbs, visceral ischaemia or hypertension due to renal ischaemia. PATIENTS/METHODS: From 1/1984 to 11/2008, 80 patients (26 m, 54 f, mean age 61.6, range 14 to 86 years) underwent treatment in the Department of Vascular Surgery and Kidney Transplantation, Heinrich-Heine-University Hospital for CRA. The present study is based on a review of patient records and prospective follow-up in our outpatient clinic. RESULTS: The most frequent finding was renovascular hypertension (n=33, 41.3%) causing headache, vertigo and visual symptoms. Intermittent claudication due to peripheral arterial occlusive disease was found in 35 cases (43.8%). 15 patients (18.8%) presented with chronic visceral ischaemia causing diarrhoea, weight loss and abdominal pain. 79 patients (98.7%) underwent surgery; in 73 (93.7%) aortic reconstruction was achieved with thromboendarterectomy, on an isolated suprarenal segment in 7 (9.3%), an infrarenal segment in 21 (26.6%), and the supra- and infrarenal aorta in 45 cases (60%). Desobliteration of renal arteries was performed in 47 (one-sided n=8, 10.1%; both arteries n=39, 49.4%); the aortic bifurcation was desobliterated in 37 (46.8%), extension into iliac arteries was necessary in 29 cases (one-sided n=4, 5.1%; both arteries n=25, 31.6%). The coeliac trunk was desobliterated in 43% (n=34), the superior mesenteric artery in 44.3% (n=35) and the inferior mesenteric artery in 20.3% (n=16). In 15 cases additional revascularisation (bypass, transposition, graft interposition) was necessary. Surgical access was via a left-sided thoracoabdominal incision in 56.4% (n=45) and via laparotomy in 41.8% (n=33). The 30-day lethality was 8.7% (n=7). Postoperative complications requiring corrective surgery occurred in 11 patients (13.9%). Almost ⅓ of the patients (n=19, 27.5%) returned for follow-up after a mean of 52.6 months (range 3 to 215 months). Of these, there was significant clinical and diagnostic improvement in 16 (84.2%) and 3 (15.8%) were unchanged. Impairment was not observed. CONCLUSION: In spite of the existing and improving surgical techniques for the treatment of CRA, procedures are challenging and should be performed in centres with expertise.


Subject(s)
Aorta, Abdominal/surgery , Aortic Diseases/surgery , Arterial Occlusive Diseases/surgery , Calcinosis/surgery , Adolescent , Adult , Aged , Aged, 80 and over , Aortic Diseases/diagnosis , Arterial Occlusive Diseases/diagnosis , Atherectomy , Blood Vessel Prosthesis Implantation , Calcinosis/diagnosis , Female , Follow-Up Studies , Humans , Hypertension, Renovascular/diagnosis , Hypertension, Renovascular/surgery , Ischemia/diagnostic imaging , Ischemia/surgery , Kidney/blood supply , Leg/blood supply , Male , Middle Aged , Postoperative Complications/etiology , Postoperative Complications/mortality , Radiography , Retrospective Studies , Survival Rate , Thrombectomy , Viscera/blood supply , Young Adult
14.
Eur J Vasc Endovasc Surg ; 40(2): 241-5, 2010 Aug.
Article in English | MEDLINE | ID: mdl-20537571

ABSTRACT

OBJECTIVE: Agenesis of the inferior vena cava (IVC) is a rare vascular malformation. Deep vein thrombosis (DVT) and bilateral pelvic thrombosis develop quite frequently, making surgical therapy necessary. PATIENTS AND METHODS: Between 1982 and 2006, 15 patients (nine male, six female, mean age 28 standard deviance 9 years) with agenesis of the IVC (IVCA) were treated surgically because of acute or subacute DVT. These patients underwent bilateral transfemoral ante- and retrograde thrombectomy of the iliofemoral and sometimes popliteal veins and replacement of the IVC with an external ring supported PTFE-graft. Bi- or unilateral arteriovenous fistulae were created in the femoral region. The fistulae were closed, on average, 8 months after trans-arterial venography was performed. These patients were examined clinically and by duplex ultrasound imaging during follow-up to assess graft patency and to allow CEAP classification. Patients were assessed for the development of post-thrombotic syndrome (PTS). RESULTS: No patient died during any part of their treatment or within 60 days. Primary patency of the venous reconstruction was 53%, secondary and long time follow-up patency was 83%. The mean duration of follow-up was 41 SD 12 months. Minor complications were observed in five cases (33%). PTS showed no progression during a follow-up of 41 SD 12 months in all patients. There was no change in the CEAP clinical stage during follow-up nor did any leg ulcer develop. CONCLUSION: A surgical approach to restore venous patency is effective and appears to prevent the deterioration of CVI over time.


Subject(s)
Vena Cava, Inferior/abnormalities , Vena Cava, Inferior/surgery , Adolescent , Adult , Arteriovenous Shunt, Surgical , Female , Humans , Male , Retrospective Studies , Thrombectomy , Ultrasonography, Doppler, Duplex , Vascular Patency , Vena Cava, Inferior/diagnostic imaging , Venous Thrombosis/surgery , Young Adult
15.
Z Gastroenterol ; 48(3): 381-91, 2010 Mar.
Article in German | MEDLINE | ID: mdl-20221992

ABSTRACT

BACKGROUND: Patients with inflammatory bowel diseases (IBD) experience various bodily and psychosocial impairments. We report data from a recent German questionnaire survey. METHODS: The cross-sectional study was conducted in 2005 as a postal survey in three regions in West (Kiel and Luebeck, Regensburg) and East (Halle/Saale) Germany. Patients with Crohn's disease and ulcerative colitis (CD, UC) were recruited from specialized gastroenterological practices, university outpatient clinics, and the registry of a prominent patient organization (DCCV). The questionnaire followed the concept and distinctions of WHO's ICF and incorporated (inter-)nationally established items and scales (i. a. HADS). RESULTS: Survey responders (n = 1083, CD: 58 %, 65 % female) had a mean age of 42 years with an average disease duration of 13 years. 25 % suffered severely or very severely from their disease in general, one third stated at least severe fatigue, and 52 % felt profoundly affected by stress. A clinically relevant anxiety was observed in 24 % with no relevant difference between males and females. Depression was more common in men (29 %) than in women (21 %). Restrictions in social participation (family life, work) were actually prominent in at least a quarter of the responders. CONCLUSIONS: Beside somatic ailments typical for the disease, patients also reported multiple psychosocial impairments and participation restrictions and should hence profit from a multi- and interdisciplinary team care.


Subject(s)
Fatigue/epidemiology , Fatigue/psychology , Inflammatory Bowel Diseases/epidemiology , Inflammatory Bowel Diseases/psychology , Stress, Psychological/epidemiology , Stress, Psychological/psychology , Adolescent , Adult , Age Distribution , Aged , Aged, 80 and over , Comorbidity , Data Collection , Female , Humans , Male , Middle Aged , Prevalence , Psychology , Risk Assessment/methods , Risk Factors , Sex Distribution , Young Adult
16.
Transplant Proc ; 41(10): 4047-51, 2009 Dec.
Article in English | MEDLINE | ID: mdl-20005339

ABSTRACT

INTRODUCTION: The acceptance of a living donor kidney bearing cysts might implicate complications after the transplantation due to the natural history of renal cysts. We have presented our experience with transplantation of living donor kidneys containing cysts but not polycystic disease. PATIENTS AND METHODS: We retrospectively reviewed donor and recipient records of all living kidney transplants performed between January 1997 and April 2008. We analyzed serum creatinine and urea levels, as well as ultrasound scans concerning cyst size and morphology at hospital discharge as well as at 12 and 24 months after transplantation. RESULTS: Among 268 living kidney transplantations, we noted 25 donors with renal cysts. In the computed tomography scan reports, 19 kidneys were described to show a single and six, multiple cysts. The size of 10 single cysts was <5 mm; the other nine were a mean of 17.33 mm. Two of the multiple cyst kidneys had lesions <5 mm; in four kidneys, the mean cyst size was 27.25 mm. The renal function of the recipients was normal or almost normal at discharge with a tendency to lower levels at 12 and 24 months after transplantation. Ultrasound revealed changes in cyst diameter among 6/23 kidneys; the mean diameter increased after 12 months, namely, 8.25 mm to 11.5 mm after 24 months. The subgroup of patients with enlarged cysts showed creatinine and urea levels slightly higher than in the entire group. No aspects of malignancy were found, according to the Bosniak and Israel classification system. One suspicious cyst was tomographically confirmed to be hemorrhagic without any need for treatment. None of the living donors had any problems related to the donor nephrectomy or a need for dialysis due to renal insufficiency in the long term. In addition, the living donors who had even beforehand cystic lesions in their contralateral nonremoved kidney at the time of transplantation did not show complications upon follow-up. CONCLUSIONS: In our study, 25 living donor kidneys carried cysts. Neither cyst-related complications nor dysfunction of the transplanted organs occurred. An unroofing or excision of the cyst was generally not necessary. Regular ultrasound scans and optional computed tomography scans are recommended for follow-up. Based on this experience, we concluded that kidneys presenting cystic diseases should be considered to be suitable for transplantation without a hazard to the recipients, thus extending the pool of organs.


Subject(s)
Kidney Transplantation/methods , Living Donors , Nephrectomy/methods , Patient Selection , Polycystic Kidney Diseases/pathology , Adult , Aged , Creatinine/blood , Female , Follow-Up Studies , Functional Laterality , Humans , Male , Middle Aged , Polycystic Kidney Diseases/diagnostic imaging , Postoperative Complications/epidemiology , Radiography , Retrospective Studies , Time Factors , Tomography, Emission-Computed , Urea/blood
17.
Zentralbl Chir ; 134(4): 305-9, 2009 Aug.
Article in German | MEDLINE | ID: mdl-19688677

ABSTRACT

BACKGROUND: In the therapy for peripheral arterial occlusive disease there remain inadequacies in the use of alloplastic material concerning thrombogenicity and biological compliance. In the 1960s, Sparks tried to combine the advantages of alloplastic prostheses with those of autologous reconstructions by using incorporated prostheses. No extensive myointimal hyperplasia was noted, but besides infections aneurysmatic dilatation were limiting factors in clinical practice. MATERIAL AND METHODS: The incorporation of modern alloplastic prostheses without connection to circulation concerning the thickness of neointima as well as the percentage of smooth muscle cells was examined in a dog model. RESULTS: The thickness of the neointima increased significantly in Dacron grafts with a peak on day 70 (p = 0.022), additionally a significantly greater percentage of smooth muscle cells was noted in Dacron grafts after 44 and 58 days (p = 0.008, p = 0.036). CONCLUSION: Due to the decreased thickness of the incorporating matrix as well as the lower percentage of smooth muscle cells, PTFE grafts should be preferred for peripheral arterial revascularisation.


Subject(s)
Blood Vessel Prosthesis , Polyethylene Terephthalates , Polytetrafluoroethylene , Tunica Intima/pathology , Wound Healing/physiology , Actins/analysis , Animals , Capillaries/pathology , Connective Tissue/pathology , Dogs , Fibromuscular Dysplasia/pathology , Microscopy, Fluorescence
18.
J Cardiovasc Surg (Torino) ; 50(2): 195-203, 2009 Apr.
Article in English | MEDLINE | ID: mdl-19329916

ABSTRACT

AIM: The Propaten European Product Evaluation (PEPE II) study was a product evaluation intended to characterize the performance of the GORE PROPATEN vascular graft in above-knee (AK) and below-knee bypass (BK) surgery. METHODS: This prospective multicenter trial enrolled 142 patients with peripheral arterial disease. In 87 patients AK and in 52 patients BK bypasses (including 15 femorocrural) were implanted (67.6% males, 32.4% females). RESULTS: The one-year overall primary and secondary patency rates were 80% and 84.7%, respectively. Overall limb salvage rate at 12-months was 96.2%. The primary patency rate for AK bypasses was 82.7%, for BK femoro-popliteal bypasses 74.2% and for BK tibial-peroneal bypasses 79.4%. Secondary patency rates were 87.3%, 78.8% and 85.1%, respectively. Primary patency rates decreased depending on the number of patent run-off vessels (three 84.3%, two 80.8%, one 73.3%). Subgroup analysis showed that female patients had a significantly higher primary patency rate for BK bypasses (95.5% vs. 67.8%, P=0.037 ) compared to male patients. Subgroup analysis comparing patients younger and older than 70 years did not show a statistically significant difference in patency rates. Twenty-one patients underwent 42 reinterventions after bypass surgery. CONCLUSIONS: Present data show that the end-point heparin-bonded polytetrafluoroethylene graft yields patency rates comparable to those obtained with other graft material in above-knee locations. The encouraging results for BK bypasses suggests that this graft is an excellent option for small diameter vascular reconstructions when autologous vein is unavailable.


Subject(s)
Arterial Occlusive Diseases/surgery , Blood Vessel Prosthesis Implantation/instrumentation , Blood Vessel Prosthesis , Coated Materials, Biocompatible , Fibrinolytic Agents/administration & dosage , Graft Occlusion, Vascular/prevention & control , Heparin/administration & dosage , Polytetrafluoroethylene , Vascular Patency , Aged , Arterial Occlusive Diseases/physiopathology , Blood Vessel Prosthesis Implantation/adverse effects , Europe , Female , Graft Occlusion, Vascular/etiology , Graft Occlusion, Vascular/physiopathology , Graft Occlusion, Vascular/surgery , Humans , Knee , Male , Prospective Studies , Prosthesis Design , Reoperation , Time Factors , Treatment Outcome
19.
Ultraschall Med ; 30(3): 291-6, 2009 Jun.
Article in English | MEDLINE | ID: mdl-18484063

ABSTRACT

PURPOSE: Previous studies have demonstrated that plaques from the internal carotid artery with lower median grayscale values are associated with higher complication rates in the perinterventional course. A repeatedly cited limitation of ultrasound is that the single plane used to calculate the median grayscale value is only two dimensional. The goal of this study was to compare the median grayscale value as determined using two dimensional cuts versus three dimensional data sets. MATERIALS AND METHODS: Seventy-one cuts of 24 thromboendarterectomy samples from 19 patients were analyzed using 3D data sets. The ultrasound data sets were obtained using a 10 MHz probe in 3D mode in a special chamber and were evaluated by two investigators. Additionally, a longitudinal view of the samples was made using B mode according to a standardized protocol. RESULTS: There was a significant correlation between the 2D and 3D data as assessed by two observers (p < 0.001, intraclass correlation [ICC] > 0.895) and at different times (p < 0,001, ICC > 0.935). Comparison of the 3D transverse cuts with the longitudinal B mode cuts also showed a highly significant association between the two methods (p < 0.001, R = 0.800). 97.2 % of the measured values were within the limits of agreement, reflecting the concordance of the both methods. CONCLUSION: The superiority of three dimensional ultrasound with respect to two dimensional ultrasound was not able to be demonstrated using this standardized in vitro procedure to examine the echolucency in extracranial internal carotid artery plaques.


Subject(s)
Carotid Artery, Internal/diagnostic imaging , Carotid Stenosis/diagnostic imaging , Image Enhancement/methods , Image Processing, Computer-Assisted/methods , Imaging, Three-Dimensional/methods , Ultrasonography/methods , Brain Ischemia/diagnostic imaging , Brain Ischemia/surgery , Carotid Artery, Internal/surgery , Carotid Stenosis/surgery , Endarterectomy, Carotid , Female , Humans , Image Enhancement/instrumentation , Image Processing, Computer-Assisted/instrumentation , Imaging, Three-Dimensional/instrumentation , Male , Observer Variation , Prognosis , Sensitivity and Specificity , Ultrasonography/instrumentation
20.
Nuklearmedizin ; 47(5): 194-9, 2008.
Article in English | MEDLINE | ID: mdl-18852925

ABSTRACT

AIM: Employees of Sanofi-Aventis Deutschland GmbH underwent thyroid screening in 2006 to assess new data about the prevalence of irregular sonomorphological pattern, elevated thyroid peroxidase antibodies (TPO AB) and thyroid function in an unselected adult German population. PARTICIPANTS, METHODS: The examination included 700 unselected employees. Blood samples were analyzed for serum TSH and TPO AB, and ultrasound of the thyroid was performed. RESULTS: In 40.7% of the participants (n = 285) an irregular sonomorphological pattern was detected: goiter in 13.7%, nodules in 35.6%, nodular goiter in 8.6% and a hypoechogenic pattern of the thyroid gland in 20.4%. Serum TSH was increased in 3.9% and decreased in 0.6%. Elevated TPO AB values were observed in 13%. Only 1.4% (n = 10) showed elevated TPO AB combined with a TSH increase. Sonomorphological abnormalities were associated with increased TPO AB in 7.1%. Elevated TPO AB was observed significantly more often in combination with sonomorphological pathology (54.9%) than without (45.1%) (p = 0.003). CONCLUSIONS: Sonomorphological disorders are still very common in Germany and our results are comparable with previous screening examinations. Elevated TPO AB correlated significantly with the sonomorphological pattern of nodules and goiter. This may reflect an improved iodine supply or a hypertrophic stage of autoimmune thyroiditis in some cases.


Subject(s)
Autoantibodies/blood , Iodide Peroxidase/immunology , Thyroid Function Tests , Adolescent , Adult , Aged , Female , Germany , Goiter/diagnostic imaging , Goiter/epidemiology , Goiter, Nodular/epidemiology , Humans , Hypothyroidism/epidemiology , Iodide Peroxidase/blood , Male , Mass Screening , Middle Aged , Sex Characteristics , Thyroid Gland/diagnostic imaging , Thyroiditis, Autoimmune/epidemiology , Thyrotropin/blood , Ultrasonography , Young Adult
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