Cau 2: mo ta cac giai doancua chu ky tim va UDLS? - Chu ky tim la 1 vong hdong cua tim gom nhi thu, that thu va tam truong toan bo - Nguoi binh thuong co f=75 nhip/ phut thi thoi gian cua 1 chu ky tim la 0,8s gom 3 gd: *) Giai doan tam nhi thu: (tam nhi co lai) (0,1s) - Khi co tam nhi co lam ap suat trong tam nhi tang > trong tam that. Luc nay van nhi_that dang mo, mau dc day tu tam nhi xuong tam that - Tam nhi thu co tac dung day not lg mau con lai xuong tam that ( 35% tong lg mau tu tam nhi xuong tthat trong 1 chu ky tim) - Mau tu tam nhi xuong tthat o gdoan nay lam cho ap suat tam that cung tang len *) Giai doan tam that thu : - La giai doan tam that co lai, ban daqu sau gd tam nhi thu. Gd tam that thu chia lam 2 thoi ky: - Thoi ky tang ap: 0,05s +) co tam that co, ap suat trong tam that tang len > tam nhi -> van nhi_that dong lai. Ty vay trong luc nay astt<asdm ->van to chim chua mo ra(van dm) do do tky nay goi la co dang tick +) o tky nay ap suat mau trong tam that tang nhanh +) astt tang-> van nhi that dong lai va loi len ve phia tam nhi do do astnhi tang - Thoi ky tong mau(0,25s) Cuoi thoi ky tang ap, astt > asdmc va > asdm phoi -> van to chim mo ra mau phun vao DM. luc nay tthat ttuc co bop, the tick tthat nho lai, astt van cao, mau ttuc dc tong vao dm Thoi ky tong mau chia lam 2 thi: +) thi tong mau nhanh: la thi bdau cua tky tong mau, trong thi nay 4/5 lg mau cua tam that dc tong vao dm +) thi tong mau cham: la thi tiep theo cua thoi ky tong mau nhanh, thoi gain dai hon,1/5 lg mau con lai cua tam that dc tong vao dm *) Giai daon tam truong toan bo (0,4s) - Tam that bat dau gi•n ra, do la gd tam truong toan bo( trong luc do tam nhi van dang gi•n) - Khi co tam that gi•n thi astt giam, khi astt<asdm chu va dm phoi thi van to chim dong lai - Tam that tiep tuc gi•n, do la tky gi•n dang tick, as tham thau tiep tuc giam nhanh cho den khi astt<astnhi thi van nhi that bat dau mo ra kthuc thoi ky gi•n dang tick, mau dc hut tu tam nhi xuong tam that +) Day that nhanh: sau khi can nhi that mo ra mau dc hut xuong tthat nhanh +) Day that cham: sau do mau xuong tthat cham dan sau thi day that nhanh - Giai doan tam truong toan bo la thoi gian de mau tu tam nhi xuong taam that chiem 65% tong lg mau tu tam nhi xuong tam that trong 1 chu ky tim *) chu ky tim lsang: 2 chu ky: - gd taam thu: tam that co, tim bom mau vao dm - gd tam truong: tam that gi•n????? *) UDLS : - nguoi bi suy tim ng ta dung nghiem phap do ap luc tinh mach trung tam xem knang hut mu ve tim - Bieu hien ben ngoai cua chu ky tim : so mom tim nguc biet chu ky tim bthuong hay ko bthuong, 1 so TH benh ly co lung muu, tieng T1 tach doi...