Tim K. Timmers
Utrecht University
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Featured researches published by Tim K. Timmers.
Archives of Surgery | 2011
Tim K. Timmers; Michiel H. Verhofstad; Kg Moons; Ed F. van Beeck; Luke P. H. Leenen
OBJECTIVES To quantify the long-term (>6 years) health-related quality of life (HRQOL) of a large cohort of patients admitted to a surgical intensive care unit (ICU). In addition, we aimed to explore the influence of different surgical classifications on long-term health status and to make comparisons with general population norms. DESIGN Prospective observational cohort study. SETTING A Dutch teaching hospital. PATIENTS All surviving surgical ICU patients admitted to the Dutch teaching hospital between 1995 and 2000. MAIN OUTCOME MEASURES Patient-reported data on HRQOL were collected with the EuroQol-6D (EQ-6D) after a mean follow-up of 8 years (range, 6-11 years). Patient characteristics, surgical classification, length of ICU stay, and survival were prospectively registered. The EQ utility scores (measured with the EQ-5D US index tariff), EQ visual analog scale scores, and prevalences of domain-specific health problems were calculated. The effect of surgical classification on EQ utility scores and EQ visual analog scale scores was assessed by multivariable generalized linear regression analysis. Logistic regression was used to explore the influence of surgical classification on domain-specific health problems. Long-term HRQOL of surgical ICU patients was compared with an age- and sex-matched general Dutch population using t test analysis. RESULTS Eight hundred thirty-four patients survived the ICU and were available for follow-up. In 575 patients (69%), the HRQOL was measured. For all surgical classifications combined, after 6 to 11 years, nearly half of all patients still had problems with mobility (52%), usual activity (52%), pain/discomfort (57%), and cognition (43%). Compared with the age- and sex-matched general population, HRQOL was worse, with a difference of 0.11 on the EQ utility score (range, 0-1). Oncological surgery patients had the best (EQ utility score, 0.83) and vascular patients had the worst (EQ utility score, 0.72) HRQOL. Trauma (odds ratio between 2.47-3.47) and vascular surgery (odds ratio between 2.27-5.37) patients showed significantly increased prevalences of problems in mobility, self-care, usual activities, and cognition. CONCLUSIONS More than 6 years after a surgical ICU admission, HRQOL of this patient population is largely reduced. Many patients still have a variety of health problems, including decreased cognitive functioning. Treatment advances should be made to reduce the current health deficit of surgical ICU survivors compared with the general population.
Journal of Shoulder and Elbow Surgery | 2016
Martijn Hulsmans; Mark van Heijl; R. Marijn Houwert; Tim K. Timmers; Ger van Olden; Egbert J. M. M. Verleisdonk
BACKGROUND Open reduction and plate fixation has gained recognition as an effective treatment for certain types of clavicular fractures. However, 88% of cases report some implant-related problems. To determine the optimal plate position, the aim of the present study was to compare implant-related irritation and proportion of plate removal in patients with clavicular fractures undergoing plate fixation by an anteroinferior or superior approach. METHODS Retrospectively collected data of 39 patients who underwent anteroinferior plating for displaced midshaft clavicular fractures were compared with prospectively collected data of 60 patients who were treated with superior plate fixation as part of a multicenter randomized controlled trial. Electronic medical records were reviewed for reports of complications, in particular, implant-related irritation and implant removal during follow-up. In addition, all patients were contacted in June 2014 to obtain additional information. The primary outcome parameter was implant-related irritation. RESULTS Univariate and multivariate regression analysis showed plate position was not significantly associated with implant-related irritation. Higher rates of asymptomatic patients with the plate still in place were observed in the anteroinferior group (46% vs 22%, P = .01). Almost an equal percentage of implant removals was seen in both groups because of implant irritation (36% vs 37%, P = .938). CONCLUSIONS The present study found the surgical approach of clavicular plating was not associated with implant-related irritation. Future studies are needed to determine whether there is an optimal approach for clavicle plating.
American Journal of Sports Medicine | 2017
Diederik P.J. Smeeing; Denise J.C. van der Ven; Falco Hietbrink; Tim K. Timmers; Mark van Heijl; Moyo C. Kruyt; Rolf H.H. Groenwold; Olivier A. van der Meijden; Roderick M. Houwert
Background: There is no consensus on the choice of treatment of midshaft clavicle fractures (MCFs). Purpose: The aims of this systematic review and meta-analysis were (1) to compare fracture healing disorders and functional outcomes of surgical versus nonsurgical treatment of MCFs and (2) to compare effect estimates obtained from randomized controlled trials (RCTs) and observational studies. Study Design: Systematic review and meta-analysis. Methods: The PubMed/MEDLINE, Embase, CENTRAL, and CINAHL databases were searched for both RCTs and observational studies. Using the MINORS instrument, all included studies were assessed on their methodological quality. The primary outcome was a nonunion. Effects of surgical versus nonsurgical treatment were estimated using random-effects meta-analysis models. Results: A total of 20 studies were included, of which 8 were RCTs and 12 were observational studies including 1760 patients. Results were similar across the different study designs. A meta-analysis of 19 studies revealed that nonunions were significantly less common after surgical treatment than after nonsurgical treatment (odds ratio [OR], 0.18 [95% CI, 0.10-0.33]). The risk of malunions did not differ between surgical and nonsurgical treatment (OR, 0.38 [95% CI, 0.12-1.19]). Both the long-term Disabilities of the Arm, Shoulder and Hand (DASH) and Constant-Murley scores favored surgical treatment (DASH: mean difference [MD], −2.04 [95% CI, −3.56 to −0.52]; Constant-Murley: MD, 3.23 [95% CI, 1.52 to 4.95]). No differences were observed regarding revision surgery (OR, 0.85 [95% CI, 0.42-1.73]). Including only high-quality studies, both the number of malunions and days to return to work show significant differences in favor of surgical treatment (malunions: OR, 0.26 [95% CI, 0.07 to 0.92]; return to work: MD, −8.64 [95% CI, −16.22 to −1.05]). Conclusion: This meta-analysis of high-quality studies showed that surgical treatment of MCFs results in fewer nonunions, fewer malunions, and an accelerated return to work compared with nonsurgical treatment. A meta-analysis of surgical treatments need not be restricted to randomized trials, provided that the included observational studies are of high quality.
World journal of critical care medicine | 2014
Tim K. Timmers; Michiel Verhofstad; Kg Moons; Luke P. H. Leenen
Intensive care faces economic challenges. Therefore, evidence proving both effectiveness and efficiency, i.e., cost-effectiveness, of delivered care is needed. Today, the quality of care is an important issue in the health care debate. How do we measure quality of care and how accurate and representative is this measurement? In the following report, several topics which are used for the evaluation of intensive care unit (ICU) performance are discussed: (1) The use of general outcome prediction models to determine the risk of patients who are admitted to ICUs in an increasing variety of case mix for the different intensive care units, together with three major limitations; (2) As critical care outcomes research becomes a more established entity, mortality is now only one of many endpoints that are relevant. Mortality is a limited outcome when assessing critical care performance, while patient interest in quality of life outcomes is relevant; and (3) The Quality Indicators Committee of the Society of Critical Care Medicine recommended that short-term readmission is a major performance indicator of the quality of intensive care medicine.
Critical care nursing quarterly | 2014
Tim K. Timmers; Puck F. Hulstaert; Luke P. H. Leenen
Aims/Background: We report the results of a university surgical intensive care (SICU), which are influenced by a reorganization of the department because of a downsizing of beds with the corresponding reduction of personnel resulting in a decrease in nurse-to-bed ratio. Moreover, we report the subsequent interventions and adjustments resulting in favorable results. Design: We performed a prospective observational cohort study of all consecutive surgical patients entering the SICU of our hospital, over the period 2000-2004. Methods: In order to meet the budget cuts, a reduction of number of SICU beds with a corresponding reduction of nursing staff was implemented. In the subsequent period culminating on the year 2002, collaboration problems arose between medical and nursing staff: resulting in fierce discussions on the floor. Supported through external mediators, structures/work ethics/communication/collaborative behavior, and organization of the SICU were reviewed and restructured. Results: A total of 1477 patients were admitted to the SICU. The characteristics, Acute Physiology and Chronic Health Evaluation II score and therapeutic intervention scoring system points, were not different throughout the years. The intensive care unit-length of stay (ICU-LOS) in the admission year 2002 was significantly longer (P = .001) and the crude ICU mortality was higher (P = .02) compared with the 2 admission years before. The adjusted mortality (ICU standardized mortality ratio) was also worse in 2002, however, statistically not different. After the intervention (2003 and 2004), a better result (crude ICU mortality, length of ICU stay, and ICU standardized mortality ratio) was achieved. Conclusion: Intensive care reorganization, in which higher workload is seen in medical and nursing staff, could have a negative effect on ICU outcome and length of ICU stay. Relevance to clinical practice: Interventions in ICU structures, communication, work ethics, and organization have a positive impact in conflict management.
Journal of Shoulder and Elbow Surgery | 2018
Reinier B. Beks; Yassine Ochen; Herman Frima; Diederik P.J. Smeeing; Olivier A. van der Meijden; Tim K. Timmers; Detlef van der Velde; Mark van Heijl; Luke P. H. Leenen; Rolf H.H. Groenwold; R. Marijn Houwert
BACKGROUND There is no consensus on the choice of treatment for displaced proximal humeral fractures in older patients (aged > 65 years). The aims of this systematic review and meta-analysis were (1) to compare operative with nonoperative management of displaced proximal humeral fractures and (2) to compare effect estimates obtained from randomized controlled trials (RCTs) and observational studies. METHODS The databases of MEDLINE, Embase, CENTRAL (Cochrane Central Register of Controlled Trials), and CINAHL (Cumulative Index to Nursing and Allied Health Literature) were searched on September 5, 2017, for studies comparing operative versus nonoperative treatment of proximal humeral fractures; both RCTs and observational studies were included. The criteria of the Methodological Index for Non-Randomized Studies, a validated instrument for methodologic quality assessment, were used to assess study quality. The primary outcome measure was physical function as measured by the absolute Constant-Murley score after operative or nonoperative treatment. Secondary outcome measures were major reinterventions, nonunion, and avascular necrosis. RESULTS We included 22 studies, comprising 7 RCTs and 15 observational studies, resulting in 1743 patients in total: 910 treated operatively and 833 nonoperatively. The average age was 68.3 years, and 75% of patients were women. There was no difference in functional outcome between operative and nonoperative treatment, with a mean difference of -0.87 (95% confidence interval, -5.13 to 3.38; P = .69; I2 = 69%). Major reinterventions occurred more often in the operative group. Pooled effects of RCTs were similar to pooled effects of observational studies for all outcome measures. CONCLUSIONS We recommend nonoperative treatment for the average elderly patient (aged > 65 years) with a displaced proximal humeral fracture. Pooled effects of observational studies were similar to those of RCTs, and including observational studies led to more generalizable conclusions.
Annals of Surgery | 2011
Tim K. Timmers; Michiel H. Verhofstad; Karel G.M. Moons; Luke P. H. Leenen
World Journal of Surgery | 2013
Tim K. Timmers; Joost A. van Herwaarden; Gert-Jan de Borst; Frans L. Moll; Luke P. H. Leenen
Journal of Orthopaedics and Traumatology | 2017
Ronnart N. Kruithof; Henk A. Formijne Jonkers; Denise J.C. van der Ven; Ger van Olden; Tim K. Timmers
Critical care nursing quarterly | 2014
Tim K. Timmers; Hans C. A. Joore; Luke P. H. Leenen