title: Cobalamin deficiency presenting as refractory vaso vagal syncope.
authors.forename: Kalavakolanu
authors.initials: K
authors.lastname: Sharada
authors.forename: Gokul
authors.initials: G
authors.lastname: Reddy
authors.forename: Calambur
authors.initials: C
authors.lastname: Narasimhan
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D019462:Syncope, Vasovagal / Q000097:blood / Q000175:diagnosis*; D014805:Vitamin B 12 / Q000097:blood; D014806:Vitamin B 12 Deficiency / Q000097:blood / Q000175:diagnosis*
chemical_list: D014805:Vitamin B 12