| Type | Dénomination | Description |
| 1 | Acute cardio-renal | Acute heart failure leading to acute renal failure |
| 2 | Chronic cardio-renal | Chronic heart failure leading to chronic renal failure |
| 3 | Acute reno-cardiac | Acute renal failure leading to acute heart failure |
| 4 | Chronic reno-cardiac | Chronic renal failure leading to chronic heart failure |
| 5 | Secondary | Systemic involvement leading to heart and kidney failure |