Type 2 Cardiorenal Syndrome — EECC MCQ

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ModerateHeart FailureType 2 Cardiorenal SyndromeEECC

A 58-year-old man with HFrEF (LVEF 30%) on GDMT develops progressive renal impairment (eGFR declining from 45 to 28 mL/min). His cardiologist diagnoses cardiorenal syndrome. What type of cardiorenal syndrome is this?

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Correct answer: A — Type 2 cardiorenal syndrome (chronic cardiorenal) — chronic cardiac dysfunction (HF) causing progressive chronic kidney disease through mechanisms including renal venous congestion, reduced renal perfusion, and neurohormonal activation

The Ronco classification defines 5 types of cardiorenal syndrome: Type 1 (acute cardiorenal): acute HF causing acute kidney injury; Type 2 (chronic cardiorenal): chronic HF causing progressive CKD — this patient's scenario; Type 3 (acute renocardiac): acute kidney injury causing cardiac dysfunction; Type 4 (chronic renocardiac): CKD causing cardiac disease (LVH, HF, arrhythmias); Type 5 (systemic): systemic conditions (sepsis, amyloidosis, diabetes) causing both cardiac and renal dysfunction. Type 2 CRS mechanisms: (1) renal venous congestion (the dominant mechanism — elevated CVP reduces transglomerular filtration gradient); (2) reduced renal arterial perfusion (low CO); (3) neurohormonal activation (RAAS, SNS); (4) inflammation. Management: decongestion (reducing venous pressure often improves renal function), maintain GDMT (the initial eGFR dip from RAAS inhibitors is acceptable), SGLT2 inhibitors (renoprotective).

Reference: ESC (2023): HF Guidelines; Ronco CRS Classification