RESUMO
Objective To study the alteration of blood flow indexes of ophthalmic artery (OA),central retinal artery (CRA) and posterior ciliary artery (PCA) of the patients with cone-rod dystrophy (CRD).Methods The color doppler flow imaging was used in 50 CRD patients (100 eyes,CRD group) and 90 controls (180 eyes,control group) to measure the peak systolic velocity (PSV),end diastolic velocity (EDV),timeaveraged maximum velocity (TAMV),pulsatility index (PI) and resistance index (RI)in OA,CRA and PCA,respectively,and the data was obtained and analyzed statistically by one-sample t test to compare the alteration of these parameters between the CRD group and control group.Results The TAMV of OA was (14.29 ±3.88)cm · s-1 in CRD group and (12.44 ± 3.64) cm · s-1 in the control group,and the difference was statistically significant (P ＜0.05);meanwhile,the PI was 1.75 ±0.42 in CRD group and 2.02 ±0.71 in the control group,and the difference was statistically significant (P ＜0.05).Moreover,the PSV,EDV,TAMV and PI,RI of CRA was (4.60 ± 1.29) cm · s-1,(1.61 ±0.41)cm · s-1,(2.59 ±0.67)cm · s-1 and 1.11 ±0.31,0.63 ±0.10 in CRD group,respectively,and (10.82 ± 2.97) cm · s-1,(3.28 ± 1.11) cm · s-1,(5.50 ± 2.06)cm · s-1 and 1.48 ±0.49,0.71 ±0.08,in the control group,accordingly,and the differences were statistically significant (all P ＜ 0.05).Furthermore,the PSV,EDV,TAMV and PI,RI of PCA was (7.36 ± 2.18) cm · s-1,(2.28 ± 0.82) cm · s-1,(3.99 ± 1.22)cm · s-1 and 1.28 ± 0.37,0.68 ± 0.09 in CRD group,respectively,and (11.61 ± 3.41)cm · s-1,(3.34±1.25)cm · s-1,(5.83 ±1.91)cm · s-1 and 1.49 ±0.43,0.70 ±0.09 in the control group,accordingly,and the differences were statistically significant (all P ＜0.05).Conclusion Hemodynamic unusual alterations of OA,CRA and PCA in CRD patients suggest there is the correlation between the ocular blood supply and the pathological process of CRD,which remains to be observed further.