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Asymptomatic Intradialytic Hypotension: The Need for Pre-Emptive Intervention.

Intradialytic hypotension (IDH) remains the most common severe side effect of hemodialysis despite numerous technological advancements. Recent evidence emphasises the significance of asymptomatic hypotensive episodes, as well as the hypoperfusive consequences of both relative blood pressure drops and repetitive, symptomatic events. This article reviews the physiological importance of rapid blood pressure decrease during hemodialysis, and highlights the pathological consequences of repeated asymptomatic and symptomatic hypoperfusive episodes. In proposing a view concerned with asymptomatic IDH, a practicalpre-emptive intervention is offered to improve the long-term outcomes of patients on hemodialysis. Ongoing monitoring of individual patient's mean arterial pressure (MAP) throughout the dialysis treatment can facilitate the identification of an asymptomatic hypotensive episode. A brief pause in ultrafiltration enables vascular refill and subsequent increase in MAP, allowing resumption of safe fluid removal. Such enhanced assessment results in a reduction off patient risk, allowing safe and optimal fluid removal.