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Canadian Respiratory Journal
Volume 8 (2001), Issue 4, Pages 233-238
Original Article

Influence of Bulla Volume on Postbullectomy Outcome

S Baldi,1 A Palla,2 A Mussi,2 F Falaschi,3 L Carrozzi,2 C Giuntini,2 and CA Angeletti2

1Istituto di Fisiologia Clinica CNR, Università di Pisa, Pisa, Italy
2Dipartimento Cardio Toracico, Università di Pisa, Pisa, Italy
3Dipartimento di Immagine, Università di Pisa, Pisa, Italy

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


OBJECTIVE: To quantify the contribution of the resected volume and the presence of associated, functionally significant emphysema to the postoperative improvement of pulmonary function after resection of giant lung bullae.

DESIGN: Patients undergoing elective surgery for giant bullae who had had complete pulmonary function and radiographic studies performed were reviewed retrospectively.

SETTING: All 25 patients underwent surgery at the thoracic surgery unit of the University of Pisa, Pisa, Italy.

METHODS: Pulmonary function was assessed before and 12 months after surgery. On the chest radiograph, the location of bullae, and the signs of compression and emphysema were evaluated. The radiographic total lung capacity (TLCx-ray) and the volume of bullae were measured according to the ellipse method. Postoperatively, functional and radiographic changes were analyzed. The percentage change in forced expiratory volume in 1 s (deltaFEV1%) after surgery was the main outcome measure. The influence of factors related to emphysema and bulla volume on the functional improvement postbullectomy was assessed by stepwise multiple regression.

RESULTS: Before surgery, the TLCx-ray overestimated the TLC measured by nitrogen washout, with a mean difference between the two measurements of 1.095 L. A close relationship was found between the TLCx-ray and the plethysmographic TLC (n=6; r=0.95). After surgery, dyspnea lessened (P<0.05) and FEV1 increased (P<0.01). Statistically, the radiographic bulla volume was the single most important factor determining the deltaFEV1% (r=0.80, P<0.0001).

CONCLUSIONS: These findings suggest that the preoperative size of bullae is the most important contributor to the improvement in ventilatory capacity after bullectomy, and that it is possible to predict the expected increase of postoperative FEV1 from preoperative bulla volume.