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Remote Ischemic Preconditioning and Protection of the Kidney--A Novel Therapeutic Option
Alexander Zarbock1, John A Kellum
11Department of Anesthesiology and Critical Care Medicine, University Hospital of Münster, Münster, Germany.2Center for Critical Care Nephrology, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh PA.
Objective:
Acute kidney injury is a common complication in critically ill patients and is associated with increased morbidity and mortality. Sepsis, major surgery, and nephrotoxic drugs are the most common causes of acute kidney injury. There is currently no effective strategy available to prevent or treat acute kidney injury. Therefore, novel treatment regimens are required to decrease acute kidney injury prevalence and to improve clinical outcomes. Remote ischemic preconditioning, triggered by brief episodes of ischemia and reperfusion applied in distant tissues or organs before the injury of the target organ, attempts to invoke adaptive responses that protect against acute kidney injury. We sought to evaluate the clinical evidence for remote ischemic preconditioning as a potential strategy to protect the kidney and to review the underlying mechanisms in light of recent studies.
Data Sources:
We searched PubMed for studies reporting the effect of remote ischemic preconditioning on kidney function in surgical patients (search terms: "remote ischemic preconditioning," "kidney function," and "surgery"). We also reviewed bibliographies of relevant articles to identify additional citations.
Study Selection:
Published studies, consisting of randomized controlled trials, are reviewed.
Data Extraction:
The authors used consensus to summarize the evidence behind the use of remote ischemic preconditioning.
Data Synthesis:
In addition, the authors suggest patient populations and clinical scenarios in which remote ischemic preconditioning might be best applied.
Conclusions:
Several experimental and clinical studies have shown tissue-protective effects of remote ischemic preconditioning in various target organs, including the kidneys. Remote ischemic preconditioning may offer a novel, noninvasive, and inexpensive treatment strategy for decreasing acute kidney injury prevalence in high-risk patients. Although many new studies have further advanced our knowledge in this area, the appropriate intensity of remote ischemic preconditioning, its mechanisms of action, and the role of biomarkers for patient selection and monitoring are still unknown.
Insights
Remote ischemic preconditioning shows promise for protecting kidneys in critically ill patients. This noninvasive strategy may reduce acute kidney injury (AKI) and improve outcomes, though optimal application requires further study.
Area of Science:
- Nephrology
- Critical Care Medicine
- Cardiovascular Physiology
Background:
- Acute kidney injury (AKI) is a frequent and serious complication in critically ill patients, associated with significant morbidity and mortality.
- Current strategies for preventing or treating AKI are limited, necessitating the development of novel therapeutic approaches.
- Remote ischemic preconditioning (RIPC) involves brief, controlled episodes of ischemia and reperfusion in a distant organ to induce protective adaptive responses in a target organ, such as the kidney.
Purpose of the Study:
- To evaluate the existing clinical evidence supporting the use of RIPC as a protective strategy for the kidneys.
- To review the underlying biological mechanisms of RIPC in the context of recent scientific findings.
- To identify potential patient populations and clinical scenarios where RIPC could be most effectively applied.
Main Methods:
- A systematic literature search was conducted on PubMed using keywords such as "remote ischemic preconditioning," "kidney function," and "surgery."
- Bibliographies of relevant retrieved articles were also reviewed to identify additional pertinent studies.
- The evidence was synthesized through author consensus, focusing on randomized controlled trials.
Main Results:
- Experimental and clinical studies indicate that RIPC confers tissue-protective effects across various organs, including the kidneys.
- RIPC presents a potential noninvasive, inexpensive therapeutic option for reducing the incidence of AKI in high-risk patient groups.
- The review highlights the need for further research into optimal RIPC protocols, mechanisms, and the role of biomarkers.
Conclusions:
- RIPC demonstrates potential as a novel strategy to mitigate AKI in critically ill patients.
- Further research is required to elucidate the precise mechanisms, determine optimal parameters, and establish the role of biomarkers for effective clinical implementation of RIPC.
- RIPC may offer a valuable, low-cost intervention to improve renal outcomes in vulnerable patient populations.
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