Classificação angiográfica na revascularização do membro inferior isquêmico: pode a angiografia definir a resistência do leito receptor do enxerto?

BACKGROUND: Angiography is often used as the only preoperative method to define the therapeutic approach for ischemic lower limb revascularization, either by transluminal angioplasty or surgery. Today its use is still controversial. OBJECTIVE: To compare a simple method of angiographic classification with hemodynamic preoperative and intraoperative studies of the ischemic arterial bed in order to verify its efficacy in defining arterial bed resistance. METHODS: We analyzed 68 cases of surgical revascularization of ischemic lower limbs performed from July 1999 to July 2004 at the Division of Vascular Surgery of Instituto Dante Pazzanese de Cardiologia. The characteristics of the graft recipient arterial runoff were studied and compared using the method of preoperative angiographic classification proposed by the authors, preoperative hemodynamic analysis by color duplex scanning, and intraoperative direct measurements of flow, pressure and resistance. RESULTS: Positive rates for Spearman correlation (p < 0.05) were observed between the preoperative angiographic classification proposed in this study and the preoperative ultrasound hemodynamic measurements of blood flow volume (p = 0.035) and direct intraoperative measurements of flow (p = 0.006), pressure (p = 0.037) and resistance (p = 0.006). CONCLUSION: The preoperative method of angiographic classification proposed can assess the resistance of the arterial bed to be revascularized and help to define the approach and prognosis of the revascularization of ischemic lower limbs.