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ADQI classification system of the cardiorenal syndrome [2].
| Inciting event | Secondary disturbance | |
|---|---|---|
| CRS type 1 | Acute decompensated heart failure | Acute kidney injury |
| CRS type 2 | Chronic heart failure | Chronic kidney disease |
| CRS type 3 | Acute kidney injury | Acute heart failure |
| CRS type 4 | Chronic kidney disease | Chronic heart failure |
| CRS type 5 | Codevelopment of heart failure and chronic kidney disease | |
