Table 23: Acute Dialysis Quality Initiative (ADQI) classification system of the cardiorenal syndrome
CRS Type	Inciting Event	Secondary Disturbance
Type 1	Acute decompensated heart failure	Acute kidney injury
Type 2	Chronic heart failure	Chronic kidney disease
Type 3	Acute kidney injury	Acute heart failure
Type 4	Chronic kidney disease	Chronic heart failure
Type 5	Co-development of heart failure and chronic kidney disease