Putnam P E, Orenstein S R
Department of Pediatrics, University of Pittsburgh School of Medicine, Pennsylvania.
J Pediatr Gastroenterol Nutr. 1991 Nov;13(4):354-9. doi: 10.1097/00005176-199111000-00004.
Since esophageal length varies linearly with height, intraluminal pH monitoring can be performed at a position within the esophagus that is determined by an equation. Alternatively, pH probes can be positioned under fluoroscopic guidance, though no radiographic landmarks indicate the position that is 87% of esophageal length (where the monitoring is usually accomplished). Our aims were to determine whether a relationship might exist between crown-rump length and esophageal length, for use in patients in whom height is difficult or inappropriate to measure, and to determine whether the mid-right atrium can be used as a radiographic landmark in fluoroscopic pH probe placement. Height, crown-rump length, and distance from the suprasternal notch to the left anterior superior iliac spine were measured in 65 consecutive children undergoing 24-h pH monitoring. As the pH probe was inserted under fluoroscopy, distances from the nose to diaphragm and mid-right atrium were determined. Equations were derived by simple linear regression to describe the relationships between each of the body measurements and esophageal length. There is excellent correlation between crown-rump length and the distances from the nose to diaphragm and to mid-right atrium. The mid-right atrium corresponds to 87% of the nose to diaphragm distance in many patients.
由于食管长度与身高呈线性变化，腔内pH监测可在食管内由一个方程式确定的位置进行。另外，pH探头可在荧光镜引导下定位，尽管没有影像学标志表明食管长度的87%处的位置（通常在此处进行监测）。我们的目的是确定在难以或不适合测量身高的患者中，顶臀长度与食管长度之间是否可能存在关系，以及确定右心房中部能否用作荧光镜pH探头放置的影像学标志。对65例接受24小时pH监测的连续儿童测量身高、顶臀长度以及从胸骨上切迹到左髂前上棘的距离。在荧光镜下插入pH探头时，测定从鼻子到膈肌和右心房中部的距离。通过简单线性回归得出方程式，以描述每个身体测量值与食管长度之间的关系。顶臀长度与从鼻子到膈肌和右心房中部的距离之间存在极好的相关性。在许多患者中，右心房中部对应于从鼻子到膈肌距离的87%。
