Subklavyen arter stenozu ve çalma fenomeni

Özet

Subklavyen arterin vertebral arter çıkışından önceki aterosklerotik darlığı, kol perfüzyonunu azaltırken ipsilateral vertebral akımın tersine dönmesine yol açabilir; bu akım değişikliği nörolojik yakınmalarla birlikteyse subklavyen çalma sendromu adını alır. BT anjiyografi arkus dalı ostiumunu, darlığın vertebral çıkışa göre konumunu, distal yeniden doluşu ve eşlik eden arkus damar hastalığını haritalar. Statik BT lümen anatomisini gösterir; akımın yönünü ve çalmanın hemodinamik derecesini Doppler veya akım duyarlı MR ile doğrulamak gerekir. Darlık ve eşlik eden kollateral yol gözden kaçarsa kol iskemisinin ya da vertebrobaziler belirtilerin nedeni yanlış yorumlanabilir.

Faz ve pencere

BTA tanısal

BT anjiyografi lezyonun yerini, yaygınlığını ve kollateral dolaşımı anatomik olarak değerlendirir; vertebral akım yönü duplex ultrasonografiyle gösterilebilir.

Önerilen pencereler: Anjiyo (G 600 / M 150), Mediasten (G 350 / M 50), Yumuşak doku (G 400 / M 40).

BT bulguları

• Darlık veya tıkanıklık vertebral arter ostiumunun proksimalindedir; bu anatomik ilişki çalma mekanizmasının ön koşuludur.
• Subklavyen ostiumda eksantrik kalsifiye plak ve lümen daralması aterosklerotik etiyolojiyi destekler.
• Oklüzyonun distalindeki subklavyen arter kollateral dolaşım üzerinden yeniden dolabilir.
• İpsilateral vertebral arter küçük ya da geniş görünebilir; çap tek başına retrograd akımı veya çalma şiddetini göstermez.
• Brakiyosefalik trunkus, karşı subklavyen arter ve karotis ostiumlarındaki eşlik eden plaklar çok seviyeli arkus aterosklerozunu ortaya koyar.
• Genişlemiş internal torasik, tiroservikal veya kostoservikal kollateral damarlar kronik akım kısıtlanmasına eşlik edebilir.
• Kontrast bolusunun zamanlamasına bağlı asimetrik opasifikasyon gerçek oklüzyon sanılabilir; ince kesit kaynak görüntülerde lümen devamlılığını takip et.

Normalde

Normalde subklavyen arter aort arkusundan veya brakiyosefalik trunkustan kesintisiz lümenle çıkar; vertebral arter ostiumu proksimal subklavyen arterden ayrılır ve iki taraflı damar çapları değişken olsa da keskin bir ostial daralma ya da distal yeniden doluş paterni yoktur. Aksiyel kesitlerde ostiumu, koronal oblik rekonstrüksiyonda vertebral çıkış ile lezyon arasındaki mesafeyi ve karşı subklavyen arteri kıyasla; akım yönü için normal BT görünümünden sonuç çıkarma.

Ayırıcı tanı

Vertebral arter ostial stenozu

daralma vertebral arterin kendi çıkışındadır; subklavyen darlık vertebral ostiumun proksimalinde bulunmaz.

Brakiyosefalik trunkus stenozu

sağ karotis ve sağ subklavyen akımı birlikte etkilenir; sol subklavyen ostiumu normal kalabilir.

Takayasu arteriti

arkus dallarında uzun, düzgün ve konsantrik darlıklar ile duvar kalınlaşması aterosklerotik kısa ostial plaklardan ayrılır.

Arteriyel torasik çıkış sendromu

subklavyen arter kostoklaviküler aralıkta basılır; ostial lezyon yerine pozisyonla ilişkili distal subklavyen değişiklik beklenir.

Konjenital vertebral arter hipoplazisi

vertebral damar seyri boyunca ince kalır; proksimal subklavyen darlık ve distal subklavyen yeniden doluş eşlik etmez.

Tuzaklar

• Bir fazlı BTA'da vertebral arterin opaklaşmasını antegrad akım kanıtı sayma; statik opasifikasyon kan yönünü belirlemez ve Doppler ile doğrulama gerekir.
• Subklavyen ostiumu aortik arkus kalsifikasyonu ve omuz kaynaklı çizgi artefaktı altında kalabilir; ince aksiyel kesitleri ve oblik MPR'yi birlikte değerlendir.
• Vertebral arterde tamamen ters akım örüntüsü bulunan olgularda, arter çapı Doppler dalga biçimiyle birlikte subklavyen oklüzyonunu ağır stenozdan ayırt etmeye yardımcı olabilir.
• BTA'daki zayıf distal opasifikasyonu oklüzyon saymadan önce enjeksiyon tarafını, bolus zamanlamasını ve kol pozisyonunu kontrol et.

Kendini dene

1. Anjiyografide sol subklavyen arterin proksimalinde tam oklüzyon ve ipsilateral vertebral arterde retrograd akım saptanıyor. Çalma mekanizmasını anatomik olarak en çok hangi bulgu destekler?

   • Vertebral çıkış öncesi darlık
   • Vertebral arter hipoplazisi
   • Aksiller ven trombozu
   • Brakiyal arter anevrizması
   Cevabı göster

   Vertebral çıkış öncesi darlık. Vertebral arter çıkışının proksimalindeki subklavyen darlık çalma mekanizmasının anatomik temelidir; statik BTA akım yönünü kanıtlamaz. Diğer seçenekler bu basınç ilişkisini kurmaz.

2. Subklavyen çalma sendromunda retrograd vertebral arter akımına yol açan temel anatomik lezyonun yeri neresidir?

   • Vertebral arter ostiumunun proksimalindeki subklavyen arter darlığı/oklüzyonu
   • Vertebral arter ostiumunun distalindeki subklavyen arter darlığı
   • Vertebra interkalaris arterlerinin oklüzyonu
   • Arka spinal arterlerin konjenital aplozisi
   Cevabı göster

   Vertebral arter ostiumunun proksimalindeki subklavyen arter darlığı/oklüzyonu. Çalma fenomeninin oluşabilmesi için darlık veya tıkanıklık mutlaka vertebral arter çıkışının proksimalinde yer almalıdır; distaldeki darlık antegrad akımı engellemez ve çalma oluşturmaz.

İlgili konular

• Üst ekstremite periferik arter hastalığı
• Takayasu arteriti: arkus dalları ve ekstremite damarları

Kaynaklar

Bu sayfadaki 34 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 4 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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