Lennart Viezens

Dr. Lennart Viezens

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Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 August 2021 in World Neurosurgery
Verified
Journal Article
Closed access
LVLennart Viezens
Lennart Viezens
KSKay Sellenschloh
Kay Sellenschloh
KPKlaus Püschel
Klaus Püschel
MMMichael M. Morlock
Michael M. Morlock
WLWolfgang Lehmann
Wolfgang Lehmann
LWLukas Weiser
Lukas Weiser

27 January 2022 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
AHAnnika Heuer
Annika Heuer
ASAndré Strahl
André Strahl
LVLennart Viezens
Lennart Viezens
LKLeon-Gordian Koepke
Leon-Gordian Koepke
MSMartin Stangenberg
Martin Stangenberg
MDMarc Dreimann
Marc Dreimann
(1) Background: Patients with spondylodiscitis often present with unspecific and heterogeneous symptoms that delay diagnosis and inevitable therapeutic steps leading to increased mortality rates of up to 27%. A rapid initial triage is essential to identify patients at risk for a complicative disease course. We therefore aimed to develop a risk assessment score using fast available parameters to predict in-hospital mortality of patients admitted with spondylodiscitis. (2) Methods: A retrospective data analysis of 307 patients with spondylodiscitis recruited from 2013 to 2020 was carried out. Patients were grouped according to all-cause mortality. Via logistic regression, individual patient and clinical characteristics predictive of mortality were identified. A weighted sum score to estimate a patient’s risk of mortality was developed and validated in a randomly selected subgroup of spondylodiscitis patients. (3) Results: 14% of patients with spondylodiscitis died during their in-hospital stay at a tertiary center for spinal surgery. Univariate and logistic regression analyses of parameters recorded at hospital admission showed that age older than 72.5 years, rheumatoid arthritis, creatinine > 1.29 mg/dL and CRP > 140.5 mg/L increased the risk of mortality 3.9-fold, 9.4-fold, 4.3-fold and 4.1-fold, respectively. S. aureus detection increased the risk of mortality by 2.3-fold. (4) Conclusions: The novel Hamburg Spondylodiscitis Assessment Score (HSAS) shows a good fit identifying patients at low-, moderate-, high- and very high risk for in hospital mortality on admission (AUC: 0.795; p < 0.001). The implementation of the HSAS into clinical practice could ease identification of high-risk patients using readily available parameters alone, improving the patient’s safety and outcome.

1 June 2017 in World Neurosurgery
Verified
Journal Article
Closed access
LVLennart Viezens
Lennart Viezens
CSChristian Schaefer
Christian Schaefer
RHRachel Helmers
Rachel Helmers
EVEik Vettorazzi
Eik Vettorazzi
MSMalte Schroeder
Malte Schroeder
NHNils Hansen-Algenstaedt
Nils Hansen-Algenstaedt

1 March 2013 in Journal of Neurosurgery: Spine
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Journal Article
Closed access
LVLennart Viezens
Lennart Viezens
CSChristian Schaefer
Christian Schaefer
JBJörg Beyerlein
Jörg Beyerlein
RTRoland Thietje
Roland Thietje
NHNils Hansen-Algenstaedt
Nils Hansen-Algenstaedt
Replacement of the cervical intervertebral disc by artificial implants, known as cervical total disc replacement (CTDR), is becoming a generally applied method instead of using the gold standard of the anterior cervical discectomy and fusion. Hypothetically, the preserved mobility results in the protection of the neighboring segments. There is growing evidence that results in patients who underwent CTDR were not inferior when compared to results in patients who underwent anterior cervical discectomy and fusion. The authors report a case of a healthy 53-year-old man who suffered an incomplete paraplegia below C-6 following the dislocation of an artificial CTDR device into the spinal canal with consequent compression of the spinal cord.

4 May 2021 in Scientific Reports
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Journal Article
Open access
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DND. Ntalos
D. Ntalos
BSB. Schoof
B. Schoof
DTD. M. Thiesen
D. M. Thiesen
LVLennart Viezens
Lennart Viezens
HKHolger Kleinertz
Holger Kleinertz
MSMartin Stangenberg
Martin Stangenberg
Establishing a multidisciplinary approach regarding the treatment of spondylodiscitis and analyzing its effect compared to a single discipline approach. 361 patients diagnosed with spondylodiscitis were included in this retrospective pre-post intervention study. The treatment strategy was either established by a single discipline approach (n = 149, year 2003–2011) or by a weekly multidisciplinary infections conference (n = 212, year 2013–2018) consisting of at least an orthopedic surgeon, medical microbiologist, infectious disease specialist and pathologist. Recorded data included the surgical and antibiotic strategy, complications leading to operative revision, recovered microorganisms, as well as the total length of hospital and intensive care unit stay. Compared to a single discipline approach, performing the multidisciplinary infections conference led to significant changes in anti-infective and surgical treatment strategies. Patients discussed in the conference showed significantly reduced days of total antibiotic treatment (66 ± 31 vs 104 ± 31, p < 0.001). Moreover, one stage procedures and open transpedicular screw placement were more frequently performed following multidisciplinary discussions, while there were less involved spinal segments in terms of internal fixation as well as an increased use of intervertebral cages instead of autologous bone graft (p < 0.001). Staphylococcus aureus and Staphylococcus epidermidis were the most frequently recovered organisms in both patient groups. No significant difference was found comparing inpatient complications between the two groups or the total in-hospital stay. Implementation of a weekly infections conference is an effective approach to introduce multidisciplinarity into spondylodiscitis management. These conferences significantly altered the treatment plan compared to a single discipline approach. Therefore, we highly recommend the implementation to optimize treatment modalities for patients.

11 September 2021 in Neurosurgical Review
Verified
Journal Article
Open access
PDF file
LVLennart Viezens
Lennart Viezens
MDMarc Dreimann
Marc Dreimann
ASAndré Strahl
André Strahl
AHAnnika Heuer
Annika Heuer
LKLeon-Gordian Koepke
Leon-Gordian Koepke
MSMartin Stangenberg
Martin Stangenberg
Previously, the simultaneous presence of endocarditis (IE) has been reported in 3–30% of spondylodiscitis cases. The specific implications on therapy and outcome of a simultaneous presence of both diseases are not yet fully evaluated. Therefore, the aim of this study was to investigate the influence of a simultaneously present endocarditis on the course of therapy and outcome of spondylodiscitis. A prospective database analysis of 328 patients diagnosed with spontaneous spondylodiscitis (S) using statistical analysis with propensity score matching was conducted. Thirty-six patients (11.0%) were diagnosed with concurrent endocarditis (SIE) by means of transoesophageal echocardiography. In our cohort, the average age was 65.82 ± 4.12 years and 64.9% of patients were male. The incidence of prior cardiac or renal disease was significantly higher in the SIE group (coronary heart disease SIE n = 13/36 vs. S n = 57/292, p < 0.05 and chronic heart failure n = 11/36 vs. S n = 41/292, p < 0.05, chronic renal failure SIE n = 14/36 vs. S n = 55/292, p < 0.05). Complex interdisciplinary coordination and diagnostics lead to a significant delay in surgical intervention (S = 4.5 ± 4.5 days vs. SIE = 8.9 ± 9.5 days, p < 0.05). Mortality did not show statistically significant differences: S (13.4%) and SIE (19.1%). Time to diagnosis and treatment is a key to efficient treatment and patient safety. In order to counteract delayed therapy, we developed a novel therapy algorithm based on the analysis of treatment processes of the SIE group. We propose a clear therapy pathway to avoid frequently observed pitfalls and delays in diagnosis to improve patient care and outcome.