Orta Dereceli Koroner Arter Lezyonlarında Dobutaminli Doku Doppler Ekokardiyografi İle Miyokard İskemisinin Gösterilmesi

Yazarlar

Yelda Saltan Özateş

Özet

Giriş: Koroner arterlerde %50-%69 oranında stenoz yaratan aterosklerotik plakların dobutamin stres ekokardiyografi ile saptanmasında duyarlılık %75 ile %92 arasında değişmekte olup lezyon yüzdesi azaldıkça duyarlılık azalmaktadır. Bu noktada sık karşılaşılan bir problem ise orta dereceli lezyonlar olarak bilinen %50-69 düzeyindeki koroner darlıkların klinik önemlerinin ortaya konmasıdır. Ayrıca dobutaminli ekokardiyografilerde etkinlik açısından en bilinen sorun değerlendirmenin öznel oluşudur. Amaç: Bu çalışmada öznelliği ortadan kaldırmak amacıyla dobutaminli doku doppler ekokardiyografinin orta dereceli koroner arter lezyonlarında miyokard iskemisinin belirlenmesine katkısı araştırıldı. Yöntem: Çalışmaya koroner anjiyografi ile koroner arterleri normal bulunan 50 gönüllü (grup1) ile kag sonucu tek dominant bir koroner arterde proksimal segmentte %50-69 arası stenotik lezyonu olan 50 hasta (grup2) alındı. Lezyonlar çoğunlukla sol ön inen arterdeydi. (34 hasta) Her iki gruba dobutamin stres ekokardiyografi uygulanırken doku Doppler ekokardiyografi ile miyokard akım hızları (Sm: Zirve sistolik kontraksiyon dalgası akım hızı, Em: Erken doluş dalgası akım hızı, Am: Atriyal kontraksiyon dalgası akım hızı), zaman intervalleri (İGZ: İzovolumetrik gevşeme zamanı, İKZ: İzovolumetrik kasılma zamanı, KZ: Kontraksiyon zamanı) kaydedildi. Miyokard Performans İndeksleri (MPİ) hesaplandı.  Bulgular: Grup 1’e göre grup 2’de pik dobutamin dozunda mitral anulusda doku doppler akım hızları (Sm, Em, Am) ve MPİ ölçümleri  (sırasıyla p<0,0001, p=0,003 p<0,0001) ve ek olarak interventriküler septum, lateral ve anteriyor duvarda Sm, Em ve Am dalgaları ile miyokard performans indeksi ölçümleri (her biri için p<0,05)) belirgin olarak düşük bulunmuştur. Sonuç: Bu çalışmada doku doppler inceleme eşliğinde yapılan dobutaminli stres ekokardiyografinin klasik stres testlerinin klinik değerlendirme için yetersiz olduğu orta dereceli lezyonlarda miyokard iskemisini gösterebileceği ve hatta kantitatif bilgi verebileceği belirlenmiştir.

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