Correlação entre o tempo de aceleração plantar, o índice tornozelo braquial e os escores SVS-WIfI em pacientes com isquemia crônica ameaçadora do membro

• Ano de defesa: 2021
• Autor(a) principal: Guilherme de Castro Santos
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; Brasil; MED - DEPARTAMENTO DE CIRURGIA; Programa de Pós-Graduação em Ciências Aplicadas à Cirurgia e à Oftalmologia; UFMG
• Palavras-chave em Português: Isquemia; Diabetes Melitus; Índice tornozelo-braço; Diabetes Mellitus; Diagnóstico por Imagem; Fasciíte Plantar; Índice Tornozelo-Braço
• Link de acesso: http://hdl.handle.net/1843/39097

ABSTRACT Introduction: Limb hemodynamic evaluation through ankle-brachial index (ABI) in diabetic patients with chronic limb threatening ischemia may be falsely elevated due to the calcinosis of the arteries media layer. Alternatives as toe pressure measurements, transcutaneous oxygen pressure (TCPO2) or plethysmography are not readily available in most of the vascular units in the world. A new diagnostic approach through Spectral Doppler analysis of the flow in the lateral plantar artery of the foot has shown correlation with the grade of the limb ischemia and amputation risk stages of the Wound, Ischemia, and foot Infection (WIfI) classification system and ABI. Objective: to determine the accuracy of Plantar Acceleration Time (TAP) compared to the Ankle-Brachial Index (ABI) and the amputation risk stages of the SVS-WIfI classification system in patients with chronic limb threatening ischemia (CLTI). Methods: a cross-sectional study at the Vascular Surgery Unit at the university Hospital Risoleta Tolentino Neves, in Brazil, between June 2019 and March 2020, included patients >18 years, with CLTI. Data collected from medical records were demographics, comorbidities, ABI and measurement of TAP. Individuals were categorized in three degrees based on their ABI (ABI < 0,8; ABI < 06; ABI <0,4) and two degrees based on their amputation risk (1-very low and low; 2- moderate and high), according to SVS-WIfI classification. The correlation of ABI and amputation risk with TAP was made through Spearman‘s correlation. Sensitivity, specificity, positive predictive value, negative predictive value and accuracy were also calculated using receiver operator characteristic (ROC) curves Results: A hundred eighty-four consecutive patients (265 lower limbs) were referred to the vascular imaging unit for an arterial lower limb vascular ultrasound examination. 141 patients (74 diabetic and 67 non-diabetic), 198 lower limbs (104 diabetic and 94 non-diabetic) met the criteria and were included for analysis. Plantar Acceleration Time correlated significantly with ABI and amputation risk (P < 0.001) in both groups. The accuracy of PAT to detect ABI<0.8 was up to 91% in diabetic group and 85% in non-diabetic group. Likewise, for diagnosing ABI <0.6 in diabetic patients, we observed an accuracy of 79% and in non-diabetics this accuracy was 85%. To detect an ABI lower than 0.4, the accuracy reached 88% in diabetic patients and 87% in non-diabetics. In the diabetic and non-diabetic group, the accuracy of PAT to detect moderate and high amputation risk WIfI SVS reached 77%. PAT accurately correlates with ABI and WIfI-SVS scores. Conclusions: Measurement of the Plantar Acceleration Time demonstrates high correlation with ABI and the Ischemia grading and amputation risk stages of the SVS-WIfI classification system with high sensitivity, specificity and accuracy in patients with chronic limb threatening ischemia.