Christian Jansen

Dr. Christian Jansen

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Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

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

Representative Publications

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1 October 2020 in Radiology
Verified
Journal Article
Closed access
AIAlexander Isaak
Alexander Isaak
MPMichael Praktiknjo
Michael Praktiknjo
CJChristian Jansen
Christian Jansen
AFAnton Faron
Anton Faron
ASAlois M. Sprinkart
Alois M. Sprinkart
JLJulian A. Luetkens
Julian A. Luetkens
Study participants with liver cirrhosis showed a high burden of cardiac disease at MRI including myocardial inflammation, myocardial fibrosis, and systolic dysfunction. Background Cardiac involvement in liver cirrhosis in the absence of underlying cardiac disease is termed cirrhotic cardiomyopathy. The pathophysiology of this condition is still poorly understood. ...

21 January 2022 in JHEP Reports
Verified
Journal Article
Open access
JCJohannes Chang
Johannes Chang
PHPauline Höfer
Pauline Höfer
NBNina Böhling
Nina Böhling
PLPhilipp Lingohr
Philipp Lingohr
SMSteffen Manekeller
Steffen Manekeller
MPMichael Praktiknjo
Michael Praktiknjo
Acute-on-chronic liver failure (ACLF) is a syndrome associated with organ failure and high short-term mortality. Recently, the role of surgery as a precipitating event for ACLF has been characterised. However, the impact of preoperative transjugular intrahepatic portosystemic shunt (TIPS) placement on ACLF development in patients with cirrhosis undergoing surgery has not been investigated yet. A total of 926 patients (363 with cirrhosis undergoing surgery and 563 patients with TIPS) were screened. Forty-five patients with preoperative TIPS (TIPS group) were 1:1 propensity matched to patients without preoperative TIPS (no-TIPS group). The primary endpoint was the development of ACLF within 28 and 90 days after surgery. The secondary endpoint was 1-year mortality. Results were confirmed by a differently 1:2 matched cohort (n = 176). Patients in the no-TIPS group had significantly higher rates of ACLF within 28 days (29 vs. 9%; p = 0.016) and 90 days (33 vs. 13%; p = 0.020) after surgery as well as significantly higher 1-year mortality (38 vs. 18%; p = 0.023) compared with those in the TIPS group. Surgery without preoperative TIPS and Chronic Liver Failure Consortium–Acute Decompensation (CLIF-C AD) score were independent predictors for 28- and 90-day ACLF development and 1-year mortality after surgery, especially in patients undergoing visceral surgery. In the no-TIPS group, a CLIF-C AD score of >45 could be identified as cut-off for patients at risk for postoperative ACLF development benefiting from TIPS. This study suggests that preoperative TIPS may result in lower rates of postoperative ACLF development especially in patients undergoing visceral surgery and with a CLIF-C AD score above 45. Acute-on-chronic liver failure (ACLF) is a syndrome that is associated with high short-term mortality. Surgical procedures are a known precipitating event for ACLF. This study investigates the role of preoperative insertion of a transjugular intrahepatic portosystemic shunt (TIPS) on postoperative mortality and ACLF development. Patients with TIPS insertion before a surgical procedure exhibit improved postoperative survival and lower rates of postoperative ACLF, especially in patients undergoing visceral surgery and with a high CLIF-C AD prognostic score. Thus, this study suggests preoperative TIPS insertion in those high-risk patients.

27 March 2019 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
SCStephen Casey
Stephen Casey
RSRobert Schierwagen
Robert Schierwagen
KMKai Yan Mak
Kai Yan Mak
SKSabine Klein
Sabine Klein
FUFrank Erhard Uschner
Frank Erhard Uschner
PAPeter Angus
Peter Angus
Introduction: Recent animal studies have shown that the alternate renin-angiotensin system (RAS) consisting of angiotensin-converting enzyme 2 (ACE2), angiotensin-(1–7) (Ang-(1–7)) and the Mas receptor is upregulated in cirrhosis and contributes to splanchnic vasodilatation and portal hypertension. To determine the potential relevance of these findings to human liver disease, we evaluated its expression and relationship to the patients’ clinical status in subjects with cirrhosis. Methods: Blood sampling from peripheral and central vascular beds was performed intra-operatively for cirrhotic patients at the time of liver transplantation (LT) or trans-jugular intra-hepatic portosystemic shunt (TIPS) procedures to measure angiotensin II (Ang II) and Ang-(1–7) peptide levels and ACE and ACE2 enzyme activity. Relevant clinical and hemodynamic data were recorded pre-operatively for all subjects and peripheral blood sampling was repeated 3 months or later post-operatively. Results: Ang-(1–-7) and ACE2 activity were up-regulated more than twofold in cirrhotic subjects both at the time of LT and TIPS and levels returned to comparable levels as control subjects post-transplantation. Ang-(1–7) levels correlated positively with the degree of liver disease severity, as measured by the model for an end-stage liver disease (MELD) and also with clinical parameters of pathological vasodilatation including cardiac output (CO). There were strong correlations found between the ACE2:ACE and the Ang-(1–7):Ang II ratio highlighting the inter-dependence of the alternate and classical arms of the RAS and thus their potential impact on vascular tone. Conclusions: In human cirrhosis, the alternate RAS is markedly upregulated and the activation of this system is associated strongly with features of the hyperdynamic circulation in advanced human cirrhosis.

29 April 2025 in JHEP Reports
Verified
Journal Article
Open access
DBDominik Bettinger
Dominik Bettinger
ABAnnalisa Berzigotti
Annalisa Berzigotti
MMMattias Mandorfer
Mattias Mandorfer
CRCristina Ripoll
Cristina Ripoll
CLChristian Labenz
Christian Labenz
MDMatthias M. Dollinger
Matthias M. Dollinger
Measurement of the hepatic venous pressure gradient (HVPG) and transjugular liver biopsy have emerged as important tools in clinical hepatology. Measurement of HVPG is considered the gold standard for detecting clinically significant portal hypertension, with an HVPG of ≥10 mmHg being the key prognostic threshold in patients with compensated advanced chronic liver disease (cACLD; compensated cirrhosis). A transjugular liver biopsy can be obtained within the same procedure and may be preferred over percutaneous liver biopsy in patients with coagulopathy, ascites and/or significant obesity. Endoscopic ultrasound-guided procedures are currently under investigation and require standardisation. This article summarises critical technical aspects of HVPG measurements and transjugular liver biopsy and provides a detailed overview of their current role in the context of emerging non-invasive tests and endoscopic approaches.

5 January 2022 in Digestive and Liver Disease
Verified
Journal Article
Closed access
JCJohannes Chang
Johannes Chang
AMAlexandra Matheja
Alexandra Matheja
SKSimon Krzycki
Simon Krzycki
PLPhilipp Lutz
Philipp Lutz
NBNina Böhling
Nina Böhling
MPMichael Praktiknjo
Michael Praktiknjo

4 March 2024 in JHEP Reports
Verified
Journal Article
Open access
SLSven H. Loosen
Sven H. Loosen
FBFabian Benz
Fabian Benz
RMRaphael Mohr
Raphael Mohr
PRPhilipp A. Reuken
Philipp A. Reuken
TWTheresa Wirtz
Theresa Wirtz
Christoph RoderburgChristoph Roderburg
Christoph Roderburg
Transjugular intrahepatic portosystemic shunt (TIPS) is the most effective therapy for complications of portal hypertension. However, clinical outcomes following TIPS placement vary widely between patients and identifying ideal candidates remains a challenge. Soluble urokinase plasminogen activator receptor (suPAR) is a circulating marker of immune activation that has previously been associated with liver inflammation, but its prognostic value in patients receiving TIPS is unknown. In the present study, we evaluated the potential clinical relevance of suPAR levels in patients undergoing TIPS insertion. suPAR concentrations were measured by ELISA in hepatic vein (HV) and portal vein (PV) blood samples from 99 patients (training cohort) as well as peripheral venous blood samples from an additional 150 patients (validation cohort) undergoing TIPS placement. The association between suPAR levels and patient outcomes was assessed using Kaplan-Meier methods and Cox-regression analyses. suPAR concentrations were significantly higher in HV samples compared to PV samples and correlated with PV concentration, the presence of ascites, renal injury, and consequently with the Child-Pugh and MELD scores. Patients with lower suPAR levels had significantly better short- and long-term survival after TIPS insertion, which remained robust after adjustment for confounders in multivariate Cox-regression analyses. Sensitivity analysis showed an improvement in risk prediction in patients stratified by Child-Pugh or MELD scores. In an independent validation cohort, higher levels of suPAR predicted poor transplant-free survival after TIPS, particularly in patients with Child-Pugh A/B cirrhosis. suPAR is largely derived from the injured liver and its levels are predictive of outcome in patients undergoing TIPS. suPAR, as a surrogate of hepatic inflammation, may be used to stratify care in patients following TIPS insertion. Transjugular intrahepatic portosystemic shunt (TIPS) is the most effective therapy for complications of portal hypertension. However, clinical outcomes following TIPS placement vary widely between patients and identification of the ideal candidates remains challenging. We show that soluble urokinase plasminogen activator receptor (suPAR), a circulating marker of immune activation that can easily be measured in routine clinical practice, is a novel marker to identify patients who will benefit from TIPS and those who will not.