Being a sensitive,accurate,non-invasive and simple method,the H_2 breath test (HBT) has been widely used in determining intestinal absorption,intestinal motor function,ex- cessive bacterial growth in the intestinal aad gastric secretion.The key technique in performing HBT is the measurement of the pauci-hydrogen in expiratory air.We have successfully developed the type-88 H_2 breath tester.According to the results of performance evaluated by the Natienal Standard Material Research Center and the reports of its clincal application,it is superior in both design and performance.This new tester is suitable for use in clinics and field work owing to its high performance and simplicity in operation.

Objective To observe the rates of local complications (bleeding/swelling) after trans-radial coronary intervention (TRI),to investigate possible impact factors,in order to provide guidance for the prevention of these adverse events.Methods A total of 198 cases who performed TRI at the department of interventional cardiology of the First Affiliated Hospital of Sun Yat-sen University from August to December,2011 were included in the present study.Data with regards to local complications were collected peri-operatively,by means of direct inquiry,point-of-care observation and measurements,and laboratory testing.Patients who developed complications and patients who did not were compared in terms of compressor position,loosening protocol and so on.Variables with statistical significance in univariate analysis were further included in Cox regression.SPSS 18.0 software was applied for all statistical analysis.Results The relative risks (RR) of the following two variables,namely whether or not the midpoint of compressor was on the midline of forearm,and the vertical distance from the horizontal plate of the compressor to the puncture site,were 2.602 and 1.403,respectively.Conclusions The midpoint of compressor on the midline of forearm,and the vertical distance from the horizontal plate of the compressor to the puncture site were major risk factors of local complications after TRI.