Ribcage kinematics during exercise justifies thoracoscopic versus postero-lateral thoracotomy lobectomy prompt recovery.

OBJECTIVES

The video-assisted thoracic surgery (VATS) approach is encouraged over postero-lateral thoracotomy (PLT) for lobectomy in lung cancer. We compare the ribcage kinematics during exercise before and after both procedures, assuming that VATS, being minimally invasive, could better preserve ribcage expansion.

METHODS

Thirty-one patients undergoing lobectomy by means of VATS (n = 20) or PLT (n = 11) were compared presurgery, after chest drainage removal (T1) and 2 months post-surgery (T2) during quiet breathing and incremental exercise. Spirometry, chest pain, ventilatory pattern and expansions of the ribcage (ΔVRC) and abdomen were measured. Furthermore, the expansion of the ribcage and abdomen in the operated (ΔVRC-OP and ΔVAB-OP, respectively) and non-operated (ΔVRC-NO and ΔVAB-NO, respectively) sides was also considered.

RESULTS

At T1, in both groups, spirometry worsened and chest pain increased, being higher after PLT. Tidal volume (VT) decreased after PLT because the ribcage expanded less due to reduced ΔVRC-OP. Contrary to this, in VATS, there were no changes in VT and ΔVRC, although ΔVRC-OP was lower, because ΔVRC-NO increased at high level of exercise. At T2, ΔVRC-OP was completely restored after VATS. At high levels of exercise following PLT, although patients still showed reduced ΔVRC and ΔVRC-OP, VT was restored owing to increased ΔVAB-NO.

CONCLUSIONS

We demonstrate VATS to have a reduced impact on ribcage kinematics while PLT induced restriction more markedly during exercise and still present 2 months after surgery. Patients adopt 2 different compensatory mechanisms, by shifting the expansion toward the contralateral ribcage after VATS and toward the abdomen after PLT. Our study justifies thoracoscopic lobectomy prompt recovery.

CLINICAL TRIAL REGISTRATION: clinicaltrials.gov (NCT02910453).