Sergio Sammartano

Randomized clinical trial of botulinum toxin injection for pain relief in patients with thrombosed external haemorrhoids

Thrombosed external haemorrhoids are one of the most frequent anorectal emergencies. They are associated with swelling and intense pain. Internal sphincter hypertonicity plays a role in the aetiology of the pain. This study evaluated the efficacy and safety of an intrasphincteric injection of botulinum toxin for pain relief in patients with thrombosed external haemorrhoids.

Speciation of chitosan with low and high molecular weight carboxylates in aqueous solution

Abstract Quantitative data on the speciation of chitosan (310 kDa) with low and high molecular weight carboxylates in aqueous solution are reported. The following carboxylic ligands were considered: monocarboxylate (butyrate); dicarboxylates (malonate, succinate, azelate); tricarboxylate (1,2,3-propa-netricarboxylate); tetracarboxylate (1,2,3,4-butanetetracarboxylate); polyacrylates (2.0 and 20 kDa); polymethacrylate (5.4 kDa). The investigation was performed by potentiometry at t =25°C, at low ionic strength (without addition of supporting electrolyte) and at I =0.15mol L−1 (NaCl). For all the systems the formation of (chitosan)LHi species was found (L = carboxylic ligand; i = 1 to 4 depending on the carboxylic ligand considered). The stability of proton–chitosan–carboxylate species depends on the number of carboxylic groups involved in the complexation, and it was possible to calculate a rough free energy value per bond ΔGn = −15±2kJ mol−1. By using the stability data, the quantitative sequestering capacity of chitosan towards the carboxylates here considered [expressed as the-log(total chitosan concentration) necessary to bind 50% of carboxylate, i.e., pL50] was calculated for different pH values, at low ionic strength and at I =0.15 mol L−1. The pL50 values, ranging from 3 to 7, show that chitosan is quite a strong sequestering agent towards carboxylates. Evidences were also obtained for the different behaviour between low and high molecular weight carboxylates.

Quality of life in elderly patients after inguinal hernioplasty

Background and aim Inguinal hernia is the most frequent abdominal wall hernias in elderly population. Surgical treatment must be aware of the cardiovascular and respiratory disease these patients are often affected by. Inguinal hernia is responsible to impair the quality of life (QoL). Aim of this study was to evaluate the QoL through the Short-Form (SF)-36 questionnaire in a cohort of elderly patients undergoing inguinal hernioplasty.