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Updated: Jun 11, 2026

Multilevel Microdissection and Functional-Structural Profiling of Human Renal Arterial Branches
Published on: September 5, 2025
Cardio-renal syndromes
1Department of Nephrology, Ospedale San Bortolo, Vicenza, Italy.
Insights
Cardio-Renal Syndromes (CRS) involve heart and kidney dysfunction. The expanded 5-subtype classification aids in understanding distinct pathophysiological mechanisms for targeted prevention and therapy.
Area of Science:
- Cardiology
- Nephrology
- Internal Medicine
Background:
- Cardio-Renal Syndromes (CRS) describe heart and kidney dysfunction where one organ's failure impacts the other.
- Existing definitions are expanded to encompass diverse pathophysiological mechanisms and clinical presentations.
Purpose of the Study:
- To present an updated classification of Cardio-Renal Syndromes (CRS).
- To delineate five distinct subtypes of CRS based on primary pathology, time course, and simultaneous organ dysfunction.
Main Methods:
- Review and synthesis of current literature on cardio-renal interactions.
- Development of a refined classification system for CRS.
Main Results:
- Introduction of five CRS subtypes: Type I (Acute Heart Failure leading to Kidney Injury), Type II (Chronic Heart Failure leading to Kidney Dysfunction), Type III (Acute Kidney Injury leading to Heart Dysfunction), Type IV (Chronic Kidney Disease leading to Heart Disease), and Type V (Systemic Disease causing simultaneous Heart and Kidney Dysfunction).
- Recognition that each subtype may possess unique pathophysiological pathways.
Conclusions:
- The proposed 5-subtype classification of CRS offers a more precise framework for understanding these complex conditions.
- This refined classification may facilitate the development of distinct strategies for prevention and therapeutic interventions tailored to each CRS subtype.
Abstract:
'Cardio-Renal syndromes' (CRS) are disorders of the heart and kidneys whereby acute or chronic dysfunction in one organ may induce acute or chronic dysfunction of the other. The current definition has been expanded into five subtypes whose etymology reflects the primary and secondary pathology, the time-frame and simultaneous cardiac and renal co-dysfunction secondary to systemic disease: CRS type I: acute worsening of heart function (AHF-ACS) leading to kidney injury and/or dysfunction. CRS type II: chronic abnormalities in heart function (CHF-CHD) leading to kidney injury or dysfunction. CRS type III: acute worsening of kidney function (AKI) leading to heart injury and/or dysfunction. CRS type IV: chronic kidney disease leading to heart injury, disease and/or dysfunction. CRS type V: systemic conditions leading to simultaneous injury and/or dysfunction of heart and kidney. These different subtypes may have a different pathophysiological mechanism and they may represent separate entities in terms of prevention and therapy.
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