- Unidades + desafio
- 5 + 1
- Quadros inspirados em Feynman
- 15
- Figuras do capítulo
- 25 · completas
- Prática comentada
- 45 questões
Três ferramentas — entenda a conta e o denominador
Calcule uma mediana de pixels, confira pixels/cm e compare espessuras. Demonstrações didáticas sem classificação automática de risco ou de estenose.
40 flashcards — relembre e explique
Oito cartões por unidade: mecanismos, aquisição, interpretação e limites.
Simulado — 45 questões comentadas
Cinco questões por unidade e vinte integradoras. Correção ao final no modo prova; tesouras e limpeza individual disponíveis.
Tabelas de consulta — três tabelas do livro e três sínteses
Tabelas 6.1, 6.2 e 6.3 traduzidas integralmente, com divergências do original sinalizadas. As sínteses autorais ajudam a revisar medidas, comparação e ulceração.
Fonte, notas de fidelidade e bibliografia
Polak JF. Evaluating Carotid Plaque and Carotid Intima-Media Thickness. In: Introduction to Vascular Ultrasonography. 7ª ed. Elsevier; 2019. Capítulo 6, págs. 110–138.
As Figuras 6.1–6.25 estão presentes em 26 arquivos: a Figura 6.19 continua em um painel separado. Extrações em escala 3× (216 dpi) mantêm desenhos, traçados e medidas, com rótulos em português e acesso aos originais. As três tabelas numeradas foram traduzidas integralmente; explicações, quadros, questões e cartões são adaptações autorais.
Notas de fidelidade e diferenças entre as fontes
A legenda da Figura 6.18C informa GSM 75, e a Tabela 6.3 informa 80. A tabela associa GSM 59 à Figura 6.19, enquanto o painel D informa 29 para a placa inteira, 19 para sua porção ecolucente e 59 para a ecodensa. Os valores foram mantidos com a origem indicada. O texto de normalização usa a adventícia em torno de 190 e sangue em torno de 4–5; o esquema também mostra saturação de intensidades em 255. O critério de úlcera de 2 × 2 mm é o conservador apresentado no livro. Limiares de intervenção e velocidades citados no contexto de 2019 não foram convertidos em conduta atual. O fechamento identifica complementos ASE e ESC. Os quadros inspirados em Feynman não são falas atribuídas a ele.
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Sumário e recomendações — da imagem à decisão
Síntese autoral para revisão. O texto-base é de 2019; os complementos abaixo têm fonte e data próprias. Verificação das fontes: 22/10/2026.
O capítulo em dois minutos
- Separe as variáveis: EIM, placa e estenose não são sinônimos. EIM reúne íntima e média; altura de placa não é porcentagem NASCET.
- Mapeie em dois planos: a placa pode ser excêntrica. Procure implantação e maior projeção sem confundir corte parcial com material flutuante.
- Descreva dois eixos: brilho e homogeneidade. Uma placa pode ser uniforme e escura; cálcio e sombra podem impedir a caracterização.
- Padronize antes de quantificar: ganho, referências, fase cardíaca, segmento e bordas. Mais pixels não significam automaticamente mais resolução.
- GSM é mediana: depende da região de interesse e perde localização espacial. Não equivale a histologia, vulnerabilidade individual ou tratamento.
- Teste a hipótese de úlcera: cavidade na placa, comunicação e fluxo; diferencie o vale entre placas. O critério 2 × 2 mm é o do livro, não uma definição universal.
- Declare o que ficou oculto: superfície ou lúmen atrás de sombra não podem ser chamados de normais por ausência de imagem.
- Compare o mesmo objeto: EIM de ACC sem placa e máxima altura de placa na ACI não são medidas intercambiáveis. Associação populacional não garante utilidade de seguimento individual.
Base desta síntese: Polak JF, capítulo 6, págs. 110–138; elaboração didática autoral. As Tabelas 6.1–6.3 preservam os dados do livro e explicitam suas divergências internas.
O que as recomendações acrescentam
Quantifique placa com um método definido — ASE 2020
A ASE propõe padronização da altura da placa em 2D e favorece a avaliação volumétrica em 3D quando disponível. Caracterização de composição e atividade acrescenta perspectivas, mas não substitui a avaliação clínica. O documento distingue placa focal que se projeta no lúmen de espessamento difuso, considerando também o padrão difuso com EIM ≥1,5 mm.
Síntese do consenso, sem atribuição de classe/nível de evidência não fornecidos aqui: ASE — Assessment of Carotid Arterial Plaque by Ultrasound, JASE 2020;33:917–933.
Não usar EIM sistemática para refinar risco — ESC 2021
A ESC não recomenda medir EIM sistematicamente para melhorar a estratificação de risco, pela padronização insuficiente e pelo valor adicional limitado. Isso difere da identificação de placa: sua avaliação pode ser considerada como modificador de risco em pessoas de risco intermediário quando o escore de cálcio coronário não é viável.
Síntese da seção 3.3.3.3, sem converter a orientação em indicação de rastreamento universal: ESC 2021 — Cardiovascular disease prevention in clinical practice.
Gradue estenose pelo método apropriado — ESC 2024
A avaliação duplex integra anatomia e Doppler. A diretriz mantém a referência NASCET ou equivalente validado para graduar estenose; medidas de área e o método ECST podem superestimar a graduação em comparação com NASCET. Calcificação importante limita a precisão. Morfologia, sintomas e graduação precisam ser interpretados em conjunto.
Síntese da seção 8.2: ESC 2024 — Peripheral arterial and aortic diseases. Para o quadro velocimétrico atualizado já discutido nesta apostila, consulte o capítulo 5: critérios IAC.
Placa: informe a definição usada
O livro trabalha com aumento focal de aproximadamente 50% ou espessura em torno de 1,5 mm. O consenso de Mannheim inclui estrutura focal avançando pelo menos 0,5 mm para o lúmen, ou 50% da EIM adjacente, ou espessura >1,5 mm. A formulação ASE distingue o tipo focal/protuberante do difuso. Esses critérios devem ser atribuídos à fonte; não combine partes de definições como se fossem um único teste validado.
Definições contextualizadas na ESC 2024, seção 8.2.1.2 e na recomendação ASE 2020. Conferir a redação do documento adotado pelo serviço.
Checklist para uma conclusão revisável
- Identifique lado, vaso e segmento; registre a extensão e a projeção da placa conforme o protocolo.
- Descreva ecogenicidade, distribuição, calcificação/sombra e superfície, com as limitações pertinentes.
- Se usar EIM ou GSM, declare método, região e referências; não atribua um significado histológico exato ao número.
- Se suspeitar de cavidade, documente planos, comunicação e fluxo; diferencie pseudoulceração.
- Informe o critério utilizado para estenose e a concordância entre anatomia e hemodinâmica.
- Separe achados observados, hipóteses e limitações; correlacione com a indicação e os sintomas.
Checklist autoral, derivado dos cuidados técnicos do capítulo. Não estabelece intervalo de seguimento, medicação ou indicação automática de procedimento.
Leitura complementar no UpToDate
Para aprofundar a avaliação e a conduta, seguem os tópicos pertinentes. O texto integral do UpToDate não estava publicamente acessível nesta revisão; as recomendações acima são sínteses das fontes identificadas, e não uma reprodução ou resumo atribuído ao UpToDate.