Georg Semmler

Dr. Georg Semmler

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Research Focus & Metrics

Academic Career Length

9Years (2018-Present)

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

Representative Publications

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30 July 2021 in Liver International
Verified
Journal Article
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GSGeorg Semmler
Georg Semmler
CDChristian Datz
Christian Datz
TRThomas Reiberger
Thomas Reiberger
MTMichael Trauner
Michael Trauner
Lifestyle represents the most relevant factor for non‐alcoholic fatty liver disease (NAFLD) as the hepatic manifestation of the metabolic syndrome. Although a tremendous body of clinical and preclinical data on the effectiveness of dietary and lifestyle interventions exist, the complexity of this topic makes firm and evidence‐based clinical recommendations for nutrition and exercise in NAFLD difficult. The aim of this review is to guide readers through the labyrinth of recent scientific findings on diet and exercise in NAFLD and non‐alcoholic steatohepatitis (NASH), summarizing “obvious” findings in a holistic manner and simultaneously highlighting stimulating aspects of clinical and translational research “beyond the obvious”. Specifically, the importance of calorie restriction regardless of dietary composition and evidence from low‐carbohydrate diets to target the incidence and severity of NAFLD are discussed. The aspect of ketogenesis—potentially achieved via intermittent calorie restriction—seems to be a central aspect of these diets warranting further investigation. Interactions of diet and exercise with the gut microbiota and the individual genetic background need to be comprehensively understood in order to develop personalized dietary concepts and exercise strategies for patients with NAFLD/NASH.

31 July 2019 in Hepatology
Verified
Journal Article
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MMMattias Mandorfer
Mattias Mandorfer
KKKarin Kozbial
Karin Kozbial
PSPhilipp Schwabl
Philipp Schwabl
DCDavid Chromy
David Chromy
GSGeorg Semmler
Georg Semmler
TRThomas Reiberger
Thomas Reiberger
Background and Aims: Sustained virologic response (SVR) to interferon (IFN)‐free therapies ameliorates portal hypertension (PH); however, it remains unclear whether a decrease in hepatic venous pressure gradient (HVPG) after cure of hepatitis C translates into a clinical benefit. We assessed the impact of pretreatment HVPG, changes in HVPG, and posttreatment HVPG on the development of hepatic decompensation in patients with PH who achieved SVR to IFN‐free therapy. Moreover, we evaluated transient elastography (TE) and von Willebrand factor to platelet count ratio (VITRO) as noninvasive methods for monitoring the evolution of PH. Approach and Results: The study comprised 90 patients with HVPG ≥ 6 mm Hg who underwent paired HVPG, TE, and VITRO assessments before (baseline [BL]) and after (follow‐up [FU]) IFN‐free therapy. FU HVPG but not BL HVPG predicted hepatic decompensation (per mm Hg, hazard ratio, 1.18; 95% confidence interval, 1.08‐1.28; P < 0.001). Patients with BL HVPG ≤ 9 mm Hg or patients who resolved clinically significant PH (CSPH) were protected from hepatic decompensation. In patients with CSPH, an HVPG decrease ≥ 10% was similarly protective (36 months, 2.5% vs. 40.5%; P < 0.001) but was observed in a substantially higher proportion of patients (60% vs. 24%; P < 0.001). Importantly, the performance of noninvasive methods such as TE/VITRO for diagnosing an HVPG reduction ≥ 10% was inadequate for clinical use (area under the receiver operating characteristic curve [AUROC], < 0.8), emphasizing the need for HVPG measurements. However, TE/VITRO were able to rule in or rule out FU CSPH (AUROC, 0.86‐0.92) in most patients, especially if assessed in a sequential manner. Conclusions: Reassessment of HVPG after SVR improved prognostication in patients with pretreatment CSPH. An “immediate” HVPG decrease ≥ 10% was observed in the majority of these patients and was associated with a clinical benefit, as it prevented hepatic decompensation. These results support the use of HVPG as a surrogate endpoint for interventions that lower portal pressure by decreasing intrahepatic resistance.

1 April 2022 in Journal of Hepatology
Verified
Journal Article
Open access
GSGeorg Semmler
Georg Semmler
EMElias Laurin Meyer
Elias Laurin Meyer
KKKarin Kozbial
Karin Kozbial
PSPhilipp Schwabl
Philipp Schwabl
SHStefanie Hametner-Schreil
Stefanie Hametner-Schreil
MMMattias Mandorfer
Mattias Mandorfer
Hepatocellular carcinoma (HCC) is a major cause of morbidity and mortality in patients with advanced chronic liver disease (ACLD) caused by chronic hepatitis C who have achieved sustained virologic response (SVR). We developed risk stratification algorithms for de novo HCC development after SVR and validated them in an independent cohort. We evaluated the occurrence of de novo HCC in a derivation cohort of 527 patients with pre-treatment ACLD and SVR to interferon-free therapy, in whom alpha-fetoprotein (AFP) and non-invasive surrogates of portal hypertension including liver stiffness measurement (LSM) were assessed pre-/post-treatment. We validated our results in 1,500 patients with compensated ACLD (cACLD) from other European centers. During a median follow-up (FU) of 41 months, 22/475 patients with cACLD (4.6%, 1.45/100 patient-years) vs. 12/52 decompensated patients (23.1%, 7.00/100 patient-years, p <0.001) developed de novo HCC. Since decompensated patients were at substantial HCC risk, we focused on cACLD for all further analyses. In cACLD, post-treatment-values showed a higher discriminative ability for patients with/without de novo HCC development during FU than pre-treatment values or absolute/relative changes. Models based on post-treatment AFP, alcohol consumption (optional), age, LSM, and albumin, accurately predicted de novo HCC development (bootstrapped Harrel's C with/without considering alcohol: 0.893/0.836). Importantly, these parameters also provided independent prognostic information in competing risk analysis and accurately stratified patients into low- (~2/3 of patients) and high-risk (~1/3 of patients) groups in the derivation (algorithm with alcohol consumption; 4-year HCC-risk: 0% vs. 16.5%) and validation (3.3% vs. 17.5%) cohorts. An alternative approach based on alcohol consumption (optional), age, LSM, and albumin (i.e., without AFP) also showed a robust performance. Simple algorithms based on post-treatment age/albumin/LSM, and optionally, AFP and alcohol consumption, accurately stratified patients with cACLD based on their risk of de novo HCC after SVR. Approximately two-thirds were identified as having an HCC risk <1%/year in both the derivation and validation cohort, thereby clearly falling below the cost-effectiveness threshold for HCC surveillance. Simple algorithms based on age, alcohol consumption, results of blood tests (albumin and α-fetoprotein), as well as liver stiffness measurement after the end of hepatitis C treatment identify a large proportion (approximately two-thirds) of patients with advanced but still asymptomatic liver disease who are at very low risk (<1%/year) of liver cancer development, and thus, might not need to undergo 6-monthly liver ultrasound.

20 July 2023 in Liver International
Verified
Journal Article
Open access
BHBenedikt Silvester Hofer
Benedikt Silvester Hofer
BSBenedikt Simbrunner
Benedikt Simbrunner
LHLukas Hartl
Lukas Hartl
MJMathias Jachs
Mathias Jachs
LBLorenz Balcar
Lorenz Balcar
TRThomas Reiberger
Thomas Reiberger
Background & Aims: Removing the primary aetiological factor in decompensated cirrhosis may lead to a restoration of hepatic function. In this study, we investigated the clinical implications of recompensation and the subsequent survival in patients with decompensated alcohol‐related cirrhosis.Methods: The rate of recompensation was evaluated in patients with decompensated alcohol‐related cirrhosis and persistent alcohol abstinence undergoing a hepatic venous pressure gradient (HVPG) measurement. Recompensation was defined according to Baveno VII criteria as resolution of ascites and hepatic encephalopathy, absence of variceal bleeding and improvement in liver function.Results: Two hundred and four abstinent patients with decompensated alcohol‐related cirrhosis (age: 57.2 [IQR:50.1–63.7] years; 75.0% male; median MELD: 15 [IQR:11–19]) and a median HVPG of 20 (IQR:18–24) mmHg were included. During a median follow‐up of 24.4 (IQR:10.9–50.4) months, 37 patients (18.1%) achieved abstinence‐induced recompensation. Lower baseline HVPG, lower Child‐Pugh score, lower BMI, higher albumin and higher mean arterial pressure were linked to a higher probability of recompensation. After adjusting for age, disease severity, portal hypertension and systemic inflammation, achieving recompensation resulted in a significant and considerable reduction in liver‐related mortality (adjusted HR: 0.091 [95% CI: 0.012–0.677]; p = .019). Only 13 patients (6.4%) developed hepatocellular carcinoma, with a tendency towards a lower risk upon recompensation (HR: 0.398 [95% CI: 0.084–1.878]; p = .245), yet this finding did not reach statistical significance and requires further investigation.Conclusions: Alcohol abstinence led to recompensation in 18.1% of our cohort of HVPG‐characterised patients with decompensated alcohol‐related cirrhosis. Achieving hepatic recompensation resulted in a >90% risk reduction in liver‐related mortality.

1 January 2020 in Radiology
Verified
Journal Article
Closed access
NBNina Bastati
Nina Bastati
LBLucian Beer
Lucian Beer
MMMattias Mandorfer
Mattias Mandorfer
SPSarah Poetter-Lang
Sarah Poetter-Lang
DTDietmar Tamandl
Dietmar Tamandl
ABAhmed Ba-Ssalamah
Ahmed Ba-Ssalamah
The functional liver imaging score is a simple, noninvasive imaging marker that predicted transplant-free survival in patients with advanced, chronic liver disease. Background Gadoxetic acid–enhanced MRI enables estimation of liver function in patients with chronic liver disease (CLD). The functional liver imaging score (FLIS), derived from gadoxetic acid–enha...

24 August 2019 in Liver International
Verified
Journal Article
Open access
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BSbernhard scheiner
bernhard scheiner
GSGeorg Semmler
Georg Semmler
FMFlorian Maurer
Florian Maurer
PSPhilipp Schwabl
Philipp Schwabl
TBTheresa A. Bucsics
Theresa A. Bucsics
TRThomas Reiberger
Thomas Reiberger
Background: Anaemia is common in advanced chronic liver disease (ACLD) as a result of various risk factors.Aims & Methods: We evaluated the prevalence and severity of anaemia as well as the impact of anaemia on clinical outcomes in consecutive patients with ACLD and portal hypertension.Results: Among 494 patients, 324 (66%) patients had anaemia. Anaemic patients showed higher MELD (12 ± 4 vs 9 ± 3; P < .001), lower albumin (34 ± 6 vs 39 ± 5 g/dL; P < .001) and more often Child‐Pugh B/C stage (56% vs 17%; P < .001). The prevalence of moderate‐severe anaemia (haemoglobin <10 g/dL) increased with the degree of portal hypertension (HVPG: 6‐9 mm Hg: 22% vs HVPG: 10‐19 mm Hg: 24% vs HVPG ≥ 20 mm Hg: 36%; P = .031). The most common aetiologies of anaemia were gastrointestinal bleeding (25%) and iron deficiency (9%), while reason for anaemia remained unclear in 53% of cases. Male gender (odds ratio [OR]: 1.94 [95% CI: 1.09‐3.47]; P = .025), MELD (OR: 1.20 [95% CI: 1.09‐1.32]; P < .001), hepatic decompensation (OR: 4.40 [95% CI: 2.48‐7.82]; P < .001) and HVPG (OR per mm Hg: 1.07 [95% CI: 1.02‐1.13]; P = .004) were independent risk factors for anaemia. Anaemia was associated with hepatic decompensation (1 year: 25.1% vs 8.1%; 5 years: 60.3% vs 32.9%; P < .0001), hospitalization (73% vs 57%; P < .001) and a higher incidence rate of acute‐on‐chronic liver failure (0.05 [95% CI: 0.04‐0.07] vs 0.03 [95% CI: 0.01‐0.04]). Anaemic patients had worse overall survival (1 year: 87.1% vs 93.7%, 5 year survival: 50.5% vs 68.6%; P < .0001) and increased liver‐related mortality (1 year mortality: 9.7% vs 5.7%, 5 year mortality: 38.0% vs 26.9%; P = .003).Conclusion: Two‐thirds of patients with ACLD suffer from anaemia. The degree of hepatic dysfunction and of portal hypertension correlate with severity of anaemia. Anaemia is associated with decompensation, ACLF and increased mortality in patients with ACLD.