Medical & Biological Engineering & Computing

, Volume 48, Issue 2, pp 133–137 | Cite as

Increase in intrathoracic volume in pectus excavatum patients after the Nuss procedure

  • Pei-Yeh Chang
  • Zhen-Yu Hsu
  • Jin-Yao Lai
  • Chao-Jan Wang
  • Yu-Tai Ching
Original Article


In this study, we present finite element analysis models to calculate the increase in intrathoracic volume of pectus excavatum patients after the Nuss procedure. One virtue of our approach is that the measurement of the intrathoracic volume has no time difference and is not affected by postoperative pain, which cannot be achieved with a 2-year difference between pre- and postoperative pulmonary function testing or any other clinical method. The calculations show that the intrathoracic volume of pectus excavatum patients increased by approximately 2.72–8.88% after the Nuss procedure. The increment curve was patient-dependent, although the increment behavior was similar among the six patients examined. The curve of the increase became flat when the elevating force exceeded 80 N or the displacement of the lower sternal end exceeded 2.6 cm in half of our cases.


Pectus excavatum Intrathoracic volume Pulmonary function Nuss procedure Finite element model 



This study was supported by the National Center for High-Performance Computing (NCHC), Hsinchu, Taiwan. The authors sincerely thank Dr. Lun-Jou Lo at Chang Gung Memorial Hospital (Taoyuan, Taiwan, ROC) for his assistance in creating the finite element models reported herein.


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Copyright information

© International Federation for Medical and Biological Engineering 2009

Authors and Affiliations

  • Pei-Yeh Chang
    • 1
  • Zhen-Yu Hsu
    • 2
  • Jin-Yao Lai
    • 1
  • Chao-Jan Wang
    • 3
  • Yu-Tai Ching
    • 4
  1. 1.Division of Pediatric Surgery, Department of Surgery, Chang Gung Memorial Hospital at LinkouCollege of Medicine, Chang Gung UniversityTaoyuanTaiwan
  2. 2.Department of Mechanical EngineeringNational Chiao-Tung UniversityHsinchuTaiwan
  3. 3.Department of Radiology, Chang Gung Memorial Hospital at LinkouCollege of Medicine, Chang Gung UniversityTaoyuanTaiwan
  4. 4.Department of Computer ScienceNational Chiao Tung UniversityHsinchuTaiwan

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