Hassel D M, Schiffman P S, Snyder J R
Department of Surgical and Radiological Sciences, School of Veterinary Medicine, College of Letters & Science, University of California, Davis 95616, USA.
Am J Vet Res. 2001 Mar;62(3):350-8. doi: 10.2460/ajvr.2001.62.350.
To characterize the texture, mineralogic features, and chemical features of enteroliths obtained from horses.
Enteroliths from 13 horses with colic.
Enteroliths were harvested from 13 horses that underwent ventral midline celiotomy for treatment of colic or necropsy because of colonic obstruction and rupture caused by enteroliths. Dietary and environmental history were determined via questionnaires or evaluation of medical records. In 7 horses that underwent surgical treatment for enterolithiasis, samples of colonic contents were obtained via an enterotomy in the pelvic flexure. Colonic concentrations of magnesium (Mg), phosphorus (P), sulfur (S), sodium (Na), calcium (Ca), and potassium (K) were determined. Enteroliths were analyzed via electron microprobe analysis and X-ray diffraction.
Enteroliths varied widely regarding degree of porosity, presence and distribution of radiating texture, and composition and size of the central nidus. A distinct concentric banding was identifiable in all enteroliths. Struvite was the predominant component of all enteroliths, although Mg vivianite was identified in 5 enteroliths, and there were variable quantities of Na, S, K, and Ca in the struvite within enteroliths. Despite an abundance of Ca in colonic fluids, Mg-phosphate minerals were preferentially formed, compared with Ca-phosphates (apatite), in equine enteroliths.
Enteroliths comprise 2 major Mg phosphates: struvite and Mg vivianite. There is wide variability in macrotexture and ionic concentrations between and within enteroliths.
描述从马身上获取的肠结石的质地、矿物学特征和化学特征。
13匹患绞痛的马的肠结石。
从13匹因肠结石导致结肠梗阻和破裂而接受腹中线剖腹术治疗绞痛或尸检的马身上采集肠结石。通过问卷调查或病历评估确定饮食和环境史。在7匹接受肠结石手术治疗的马中，通过骨盆弯曲处的肠切开术获取结肠内容物样本。测定结肠中镁（Mg）、磷（P）、硫（S）、钠（Na）、钙（Ca）和钾（K）的浓度。通过电子微探针分析和X射线衍射对肠结石进行分析。
肠结石在孔隙度、放射状纹理的存在和分布以及中心核的组成和大小方面差异很大。在所有肠结石中都可识别出明显的同心带状结构。鸟粪石是所有肠结石的主要成分，尽管在5个肠结石中鉴定出了水磷镁石，并且肠结石中的鸟粪石中含有不同数量的钠、硫、钾和钙。尽管结肠液中钙含量丰富，但在马的肠结石中，与钙磷酸盐（磷灰石）相比，镁磷酸盐矿物优先形成。
肠结石由两种主要的镁磷酸盐组成：鸟粪石和水磷镁石。肠结石之间和内部的宏观质地和离子浓度存在很大差异。
