经颅脑血管多普勒超声在小儿Ⅰ型Chiari畸形诊断及疗效评估中的应用研究.

Objective To explore the application value of transcranialcerebral vessel Doppler (TVD) ultrasonography in the diagnoses and postoperative evaluations of type Ⅰ Chiari malformation in children. Methods From March 2018 to December 2021, the relevant clinical data were retrospectively reviewed for 27 children with type Ⅰ Chiari malformation. Based upon age, they were assigned into two groups of preschool (aged 1-6 year, n=15) and school-age (aged 7-16 year, n=12). TVD was detected at pre-operation, 24 h post-operation and 1 month post-operation. Posterior cerebral artery (PCA), bilateral vertebral artery (VA) and basilar artery (BA) in posterior cranial fossa were selected as target vessels. Peak systolic velocity (PSV), end-diastolic velocity (EVD) and pulsative index (PI) of the corresponding target vessels were monitored. Hemodynamic profiles of posterior cranial fossa were compared in different age groups at pre-operation versus post-operation. The accuracy of diagnosis was compared with magnetic resonance imaging (MRI) at pre-operation and the consistency of efficacy compared with Tator evaluation post-operation. Results PSV of bilateral PCA post-operation spiked in preschool group as compared with that pre-operation [left (44.25±13.06) vs. (66.76±14.45) cm/s, t=5.148, P=0.023; right (45.12±13.41) cm/s vs. (65.33±10.12) cm/s, t=5.389, P=0.021) and PI declined [left (1.18±0.42) vs. (0.91±0.18), t=4.545, P=0.033; right (1.24±0.48) vs. (0.92±0.13), t=4.776, P=0.028), bilateral VA PSV [left (43.50±11.99) vs. (70.94±7.56) cm/s, t=7.042, P=0.008; right (44.56±8.45) vs. (68.82±9.02) cm/s, t=6.833, P=0.009], preoperative EVD rose [left (19.01±9.22) vs. (27.18±8.53) cm/s, t=4.587, P=0.032; right (18.28±5.77) vs. (28.32±7.26) cm/s, t=4.683, P=0.030]and preoperative bilateral PI dropped [left (1.12±0.45) vs. (0.86±0.19), t=4.712, P=0.029; right (1.31±0.46) vs. (0.84±0.31) cm/s, t=5.277, P=0.022], BA PSV [(48.75±16.57) vs. (69.17±11.86) cm/s, t=5.413, P=0.019], preoperative EVD increased [(27.73±7.34) vs. (27.18±8.53) cm/s, t=4.738, P=0.027) and preoperative PI decreased [(1.13±0.55) vs. (0.90±0.28), t=4.721, P=0.030]; PSV of bilateral VA after surgery in school-age group was higher than that pre-operation [left (48.16±18.47) vs. (53.77±24.73)cm/s, t=4.187, P=0.045; right [(45.72±18.53) vs. (56.31±19.82) cm/s, t=3.872, P=0.036)], BA PSV [(48.50±11.44) vs. (58.17±18.86) cm/s, t=5.108, P=0.024], preoperative EVD increased [(18.63±9.91) vs. (23.19±10.63) cm/s, t=4.763, P=0.029]and preoperative PI declined [(1.06±0.42) vs. (0.92±0.25), t=4.572, P=0.032]. Preoperative TVD detection rate of 27 cases was lower than that of MRI (χ²=5.511, P=0.019). At 1 month after Tator efficacy evaluation, there were improvements (n=19, 70.4%) and non-improvements (n=8, 29.6%). TVD ultrasonic monitoring parameters improved (n=22, 81.5%) and stagnated (n=5, 18.5%). There was consistency between TVD ultrasound and Tator efficacy evaluation [χ²=0.911, P=0.340]. Conclusions MRI is a gold diagnostic standard for Chiari type Ⅰ malformation in children. However, TVD ultrasound has some accuracy and auxiliary effects. It can effectively depict the hemodynamic changes of posterior fossa artery and indirectly and non-invasively assess intracranial pressures. Thus it enables clinicians to make a timely diagnosis, offer a proper treatment and make an accurate assessment of outcomes. [ABSTRACT FROM AUTHOR]