Block of epidural needle by blood clots.
Lim
E T
ET
Teh
T S
TS
Li
Y H
YH
D015360:Analgesia, Epidural; D016362:Analgesia, Obstetrical; D001777:Blood Coagulation; D005260:Female; D006801:Humans; D009339:Needles; D011247:Pregnancy