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Các đặc điểm của dòng máu phổi với chức năng thất phải giảm ở cừu con
Tóm tắt
Các yếu tố quyết định đến hiệu suất của thất phải (RV) với vách thất phải bị tổn thương, như trong trường hợp nhồi máu thất phải, vẫn còn chưa rõ ràng. Sử dụng thiết bị siêu âm Doppler 20-MHz, chúng tôi đã điều tra sự thay đổi trong các hồ sơ vận tốc dòng máu phổi trước và sau khi thắt động mạch vành phải. Trong đó, dp/dt của RV, thể tích nhát bóp, công thất RV, áp lực động mạch chủ và lượng máu tim đều giảm, trong khi áp lực tĩnh mạch trung ương tăng lên sau khi thắt. Mối quan hệ giữa công thất RV và áp lực cuối tâm trương chỉ ra chức năng thất phải bị suy giảm sau khi thắt. Chúng tôi đã quan sát thấy thời gian gia tốc bị rút ngắn (65.0 ± 15.1 so với 54.4 ± 6.2ms, P < 0.05) và vận tốc tối đa của dòng nước tiến (59.0 ± 5.9 so với 52.5 ± 7.6cm/s, P < 0.05) giảm sau khi thắt. Gia tốc đã bị ngắt quãng sớm hơn sau khi thắt so với trước khi thắt. Những thay đổi trong dòng chảy này được cho là hậu quả của sự thay đổi chuyển động của vách thất phải và vách liên thất do nhồi máu thất phải gây ra.
Từ khóa
#Thất phải #nhồi máu thất phải #dòng máu phổi #siêu âm Doppler #chức năng timTài liệu tham khảo
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