Evans S A, Watson L, Cowley A J, Johnston I D, Kinnear W J
University Hospital, Nottingham.
Thorax. 1993 Jul;48(7):750-3. doi: 10.1136/thx.48.7.750.
Transdiaphragmatic pressure (sniff PDI) during maximal sniffs is a useful clinical test of inspiratory muscle function. Although a normal range has been established for sniff PDI using air filled balloons, no comparable data are available for catheter mounted pressure transducers.
Using a single catheter with two pressure transducers 15 cm apart, oesophageal and gastric pressures were recorded in 50 normal volunteers (25 women), five of each sex from each decade between the third and seventh decades of life. Each subject performed 10 maximal sniffs at functional residual capacity.
Mean (SD) sniff PDI was 149 (32) cm H2O in men and 127 (22) cm H2O in women. The lower limits of normal for sniff PDI (mean -1.96 x SD) after logarithmic transformation of the data were 95 and 78 cm H2O in men and women respectively.
With this technique transdiaphragmatic pressure can be measured using a single catheter which can easily be cleaned and reused. The values for sniff PDI are similar to those recorded previously with air filled balloons, suggesting that the method of recording pressure does not significantly affect the values obtained.
最大吸气时的跨膈压（吸气末跨膈压）是一项用于评估吸气肌功能的有效临床检查。虽然已通过使用充气球囊确定了吸气末跨膈压的正常范围，但对于导管式压力传感器尚无类似数据。
使用一根带有两个相距15厘米的压力传感器的导管，对50名正常志愿者（25名女性）进行食管和胃内压力记录，年龄范围在30至70岁之间，每个年龄段男女各5名。每位受试者在功能残气量时进行10次最大吸气动作。
男性的平均（标准差）吸气末跨膈压为149（32）厘米水柱，女性为127（22）厘米水柱。对数据进行对数转换后，吸气末跨膈压的正常下限（均值 -1.96×标准差）在男性和女性中分别为95和78厘米水柱。
采用该技术，可使用单一导管测量跨膈压，该导管易于清洁和重复使用。吸气末跨膈压的值与先前使用充气球囊记录的结果相似，这表明压力记录方法对所获数值无显著影响。
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