Venous Congestion in Acute Heart Failure

Pathophysiological Mechanisms

The American Journal of Kidney Diseases reports that venous congestion in acute heart failure causes elevated urinary angiotensinogen primarily through increased kidney interstitial pressure, enhanced renin-angiotensin-aldosterone system (RAAS) activation, and altered intrarenal hemodynamics 1, 2
Venous congestion decreases the arteriovenous pressure gradient, reducing renal perfusion pressure and compromising kidney function, as demonstrated in both animal models and human studies using invasive hemodynamic parameters 1, 3
Increased right-sided venous filling pressure is a major determinant of worsening kidney function in heart failure across the ejection fraction spectrum 1
Kidney venous hypertension increases hydrostatic pressures in both peritubular capillaries and the interstitium, enhancing lymphatic outflow and promoting washout of proteins 2
The European Journal of Heart Failure suggests that venous congestion triggers activation of the RAAS and sympathetic nervous system, increasing sodium reabsorption and perpetuating the vicious cycle of congestion 4, 5

The American Journal of Kidney Diseases states that venous congestion is a more important determinant of worsening renal function than low cardiac output in most heart failure patients, and that the concept of "kidney perfusion pressure" helps explain how venous congestion impairs renal function 1
In patients with cardiac dysfunction, right atrial pressure is independently associated with glomerular filtration rate, even after adjusting for renal blood flow, highlighting the importance of venous congestion in renal function 1

The Anaesthesia journal reports that the relationship between venous congestion and elevated urinary angiotensinogen highlights the importance of early and effective decongestion strategies in acute heart failure management, which can help reduce the risk of acute kidney injury and improve patient outcomes 6, 7