As a pathology, the so-called 'silent killer' a.k.a. high blood pressure (HBP) has no noticeable warning symptoms until it is usually too late. Serious heart disease is a major cause of angina and chronic spasm leading to heart attack: kidney diseases and failures are simultaneously causes and consequences of those conditionsl8,111.In this paper, we give an object-oriented specification of kidney failures at their multi functional levels, and we give suggestions for managing the catch-22 cross regulation problem between HBP and dialysis renal functions. As a specification tool, we use UML (Unified Modelling Language) as it offers total industrial compatibility and the safest standard way to describe medical organ failure processes. As a major filtering organ, kidney has been modelized as a target for ultrasonography via case-based specification 111, and as industrial pilot examples for automation and transplantation safety 12,3,41.