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Categorization of scleroderma renal crisis (SRC) as hypertensive or normotensive can potentially overlook the underlying pathophysiology that might be unique in each patient, as they often exhibit a mixture of distinct pathological characteristics of narrowly defined SRC (nd-SRC) and systemic sclerosis associated thrombocytic micro-angiopathy (SSc-TMA). In this review, we provide evidence suggesting that better categorization of patients presenting with certain clinical features of both nd-SRC and TMA will improve treatment approaches. Based on our clinical experience and literature review, distinguishing between nd-SRC and SSc-TMA is important because the association of SSc-TMA with prior steroid administration and poor prognosis was stronger than that of nd-SRC. Although the two pathological entities cannot be easily distinguished based on blood pressure, we suggest that the detailed clinical course is helpful. Typically, nd-SRC exhibits prominently elevated blood pressure and worsening of renal function initially, followed by mild thrombocytopenia. Conversely, SSc-TMA presents first with severe thrombocytopenia, followed by elevated blood pressure and renal function deterioration. The degree of involvement in each pathological condition should be considered for determination of appropriate therapeutic interventions and prognostic prediction.

Classifications of scleroderma renal crisis and reconsideration of its pathophysiology