ABSTRACT
INTRODUCTION: Evaluation of limb hemodynamics using the ankle-brachial index (ABI) may be difficult due to skin lesions, extensive necrosis, and obesity, such as commonly present in patients with diabetes with chronic limb-threatening ischemia (CLTI). We hypothesized that the pedal acceleration time (PAT) correlates with ABI and Wound, Ischemia, and foot Infection (WIfI) scores in patients with diabetes to serve as a new modality to accurately stage CLTI. METHODS: A single-center, cross-sectional study included patients with and without diabetes > 18 years with CLTI. Limbs were categorized in three grades of ischemia based on the ABI (ABI < 0.8, < 0.6, and < 0.4) and in two classes based on WIfI stages of amputation risk. Receiver operator characteristic (ROC) curves were used to determine PAT sensitivity, specificity, and accuracy to predict lower-limb ischemia. RESULTS: A total of 141 patients (67 nondiabetic and 74 diabetic) and 198 lower limbs (94 nondiabetic and 104 diabetic) met the inclusion criteria. In patients without diabetes, the accuracy of PAT for detecting an ABI < 0.8 was 85%; for detecting an ABI < 0.6 was 85%; and for detecting an ABI < 0.4 was 87%. In patients with diabetes, the accuracy of PAT in detecting an ABI < 0.8 was 91%; for detecting an ABI < 0.6 was 79%; and for detecting an ABI < 0.4 was 88%. In patients without diabetes, the accuracy for detecting WIfI stages of moderate and high amputation risk was 77% and for patients with diabetes was also 77%. CONCLUSIONS: PAT shows high correlation with the ABI as well as with the WIfI stages of amputation risk and the grades of ischemia, with high accuracy.
Subject(s)
Diabetes Mellitus , Peripheral Arterial Disease , Humans , Cross-Sectional Studies , Risk Factors , Treatment Outcome , Limb Salvage , Retrospective Studies , Ischemia , Risk AssessmentABSTRACT
RESUMO Introdução: A avaliação hemodinâmica dos membros pelo índice tornozelo-braquial (ITB) em pacientes diabéticos com isquemia crônica ameaçadora dos membros pode estar falsamente elevada devido à calcinose da camada média das artérias. Alternativas como medidas de pressão do dedo do pé, pressão transcutânea de oxigênio (TCPO2) ou pletismografia não estão disponíveis na maioria das unidades vasculares no mundo. Uma nova abordagem diagnóstica por meio da análise espectral do fluxo ao Doppler na artéria plantar lateral do pé mostrou correlação com o grau de isquemia do membro e os estágios de risco de amputação do sistema de classificação (SVS-WIfI). Objetivo: Determinar a acurácia do Tempo de Aceleração Plantar (TAP) em relação ao Índice Tornozelo-Braquial (ITB) e os estágios de risco de amputação do sistema de classificação SVS-WIfI em pacientes com isquemia crônica ameaçadora do membro (Chronic Limb Threatening Ischemia-CLTI). Métodos: Estudo transversal realizado na Unidade de Cirurgia Vascular do Hospital Universitário Risoleta Tolentino Neves, Brasil, entre junho de 2019 e março de 2020, incluindo pacientes maiores de 18 anos, portadores de CLTI. Os dados coletados nos prontuários foram: dados demográficos, comorbidades, ITB e mensuração do TAP. Os indivíduos foram categorizados em três graus com base no ITB (ITB <0,8; ITB <0,6; ITB <0,4) e dois graus com base no risco de amputação (1-muito baixo e baixo; 2- moderado e alto), de acordo com a Classificação SVS-WIfI. A correlação do ITB e do risco de amputação com o TAP foi feita por meio da correlação de Spearman. Sensibilidade, especificidade, valor preditivo positivo, valor preditivo negativo e acurácia também foram calculados através das curvas ROC (Receiver Operator CharacCurves) Resultados: Cento e oitenta e quatro pacientes consecutivos (265 membros inferiores) foram encaminhados para exame de ultrassonografia vascular com Doppler do membro inferior. 141 pacientes (74 diabéticos e 67 não diabéticos), 198 membros inferiores (104 diabéticos e 94 não diabéticos) atenderam aos critérios e foram incluídos para análise. O TAP correlacionou-se significativamente com o ITB e o risco de amputação (P <0,001) em ambos os grupos. A acurácia do TAP para detectar ITB<0,8 foi de até 91% no grupo diabético e 85% no grupo não diabético. Da mesma forma, para o diagnóstico de ITB<0,6 em pacientes diabéticos, observamos uma acurácia de 79% e em não diabéticos essa acurácia foi de 85%. Para detectar um ITB inferior a 0,4, a acurácia atingiu 88% em pacientes diabéticos e 87% em não diabéticos. No grupo diabético e não diabético, a acurácia do PAT para detectar SVS de risco moderado e alto de amputação atingiu 77%. O TAP se correlacionou com precisão com o ITB e os escores SVS-WifI. Conclusões: O tempo de aceleração plantar demonstrou alta correlação com o ITB e os estágios de classificação de isquemia e risco de amputação do sistema de classificação SVS-WIfI com alta sensibilidade, especificidade e acurácia em pacientes com isquemia crônica com risco de membro.
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.
Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Aged, 80 and over , Young Adult , Diagnostic Imaging , Fasciitis, Plantar/diagnostic imaging , Ischemia , Diabetes Mellitus , Ankle Brachial IndexABSTRACT
BACKGROUND: The precise epidemiological evaluation of amputations is difficult. It is a serious public health and economic problem with a high death rate. The proportion of amputees with pre-amputation vascular status remains unknown. The main objective of our study was to evaluate the proportion of patients with lower limb amputation who had a pre-procedural vascular assessment. The secondary objectives were to evaluate the risk of amputation at the admission of these patients, estimate the incidence of amputations in Martinique, and to collect epidemiological data on this category of patients. MATERIAL AND METHODS: We conducted an epidemiological, retrospective, and observational study, over the year 2018 between January 01 and December 31, including all adults' patients who underwent an amputation of the lower limb at the university hospital center of Martinique. RESULTS: Among the 170 included patients, 79 (46%) patients had a major lower limb amputation. The incidence of amputations in 2018 was estimated at 48.9/100,000 inhabitants. The vascular assessment was performed for 110 (65%) patients. For the other 60 (35%) patients who did not have a vascular assessment, 53 (88%) had a severe infection. This assessment was significantly related to the amputation level: a vascular assessment was performed in 97 (70%) patients with below the knee amputation versus 13 (41%) patients with above the knee amputation (P<0.01). The WIfI classification system found a high risk of amputation for 152 (89%) of patients but also a benefit of revascularization ranked high for 138 (81%) of them. The origin of amputation was limb ischemia for 125 (68%) patients. CONCLUSION: A significant number of patients who underwent lower limb amputation did not have a pre-procedural vascular assessment. Many improvements in the health care are therefore to be implemented. The upcoming M@diCICAT project in Martinique will contribute in the improvement of patient management. The incidence of amputation in Martinique is considered high compared to other countries (French national incidence in 2003=24.8/100,000 inhabitants), and it seems to have remained stable since 2008. Our population is considered to be at high risk of amputation by the SVS-WIfI classification. This score seems adapted to anticipate the evolution of these patients and could be useful in daily practice.