The inundation of Cordyceps sinensis counterfeits in the market makes it difficult to identify. In this study, 21 batches of wild C. sinensis from 3 different regions, 30 batches of naturally cultured C. sinensis and 4 kinds of counterfeits extracted by methanol and water were analyzed using NMR technology. 9 characteristic peaks were defined as quantitative criterion after comparison, and NMR fingerprints of C. sinensis were established. According to the result it is highly similar between naturally cultured C. sinensis and wild ones by comparing their NMR fingerprints. However, NMR spectra of four kinds of adulterants showed differences with C. sinensis. The result also showed that NMR fingerprint of C. sinensis are highly characteristic and specific. The NMR characteristic fingerprint of wild C. sinensis was consistent with the naturally cultured C. sinensis, and it indicated that the chemical constituents of wild C. sinensis and naturally cultured C. sinensis are nearly the same.

Objective:To investigate the effect of chimney stent for reconstruction of left subclavical artery (LSA) in thoracic endovascular aotic repair (TEVAR) for acute Stanford type B aortic dissection with insufficient anchorage zone and non-thrombotic false lumen.Methods:TEVAR with chimney stent for LSA in 39 cases of acute Stanford type B aortic dissection with insufficient anchorage zone and non-thrombotic false lumen was done from Feb 2013 to Jan 2021.Results:Covered chimney stents was used in 11 cases and bare chimney stents in 28 cases. There was no postoperative stroke, left upper limb ischemia, paraplegia, hemiplegia and death. No stent migration, reverse tear and dissection rupture were observed. One bare stent was obstructed after 18 months, and all the remaining stents were patent during follow-up. The rate of immediate type Ⅰa endoleak in covered chimney stent group and bare chimney stent group were 0(0/11) and 32.1%(9/28) respectively ( P=0.04). The distance from proximal tear to LSA in covered chimney stent group, endoleak subgroup and non-endoleak subgroup in bare chimney stent were (5.1±2.3)mm, (14.4±5.2)mm and (7.8±7.0)mm respectively ( P<0.05). False lumen thrombosis was formed in endoleak subgroup 2-8 weeks after operation, and endoleak disappeared. Conclusions:There is a correlation between immediate type Ⅰa endoleak in bare chimney stent for LSA and the distance from proximal tear to LSA, covered chimney stent can reduce the incidence of immediate type Ⅰa endoleak in TEVAR for acute Stanford type B aortic dissection with insufficient anchorage zone and non-thrombotic false lumen.