Jiménez et al. [11] studied 134 patients with a first episode of ischemic stroke and found that serum BDNF levels on around day seven post-stroke were not significantly different in patients with and without PSD at discharge (13.6 ng/ml (9.8-20.1) and 12.9 ng/ml (10.6-16.1), respectively; p = .565); similarly, by day 30, serum BDNF was lower in patients with PSD than in those without, but again, this finding was non-significant (11.4 ng/ml (9.6-19.8) and 13.5 ng/ml (11.1-18.5), respectively; p = .365). Here, BDNF is linked to stroke disorder.