Evaluation of effect of lung resection on lobar ventilation and perfusion using intrabronchial capnography

Tatsuya Yoshimasu, Shinichiro Miyoshi, Shinji Maebeya, Issei Hirai, Yasuaki Naito

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10 Citations (Scopus)


Intrabronchial capnography was applied in 11 lung cancer patients to investigate the effects of lobectomy on regional lung function. Spirometry and intrabronchial capnography were performed before surgery (PRE), and during the early (POST1, 19±5 POD) and late (POST2, 184±98 POD) postoperative periods. End-tidal carbon dioxide concentration (EtCO2) and Smidt's velocity profile index (V-index) were calculated from each lobar capnogram obtained bronchoscopically. The V-index of lobes without cancer on the operated-on side increased after surgery (PRE, 10.7±5.0%; POST1, 14.3±9.4%, NS; POST2, 16.8±8.6%, p2 after surgery was lower on the operated-on side (POST1, 5.1±1.1%; POST2, 4.6±1.1%) than on the unoperated-on side (POST1, 5.4±0.9%, p2 are compatible with the expiratory flow rate and the perfusion/ventilation ratio, respectively, we concluded that the air flow decreased on the operated-onside and increased on the unoperated-on side postoperatively and that perfusion on the operated-on side was more severely reduced than ventilation. These findings suggest that intrabronchial capnography is useful for assessing the ventilation and perfusion of the individual lobes as single units.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
Issue number1
Publication statusPublished - 1996
Externally publishedYes



  • bronchoscopy
  • capnography
  • lung cancer
  • lung resection
  • regional lung function

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

Cite this

Yoshimasu, T., Miyoshi, S., Maebeya, S., Hirai, I., & Naito, Y. (1996). Evaluation of effect of lung resection on lobar ventilation and perfusion using intrabronchial capnography. Chest, 109(1), 25-30.