TY - JOUR
T1 - Correlation of preoperative deformity magnitude and pulmonary function tests in adolescent idiopathic scoliosis
AU - Johnston, Charles E.
AU - Stephens Richards, B.
AU - Sucato, Daniel J.
AU - Bridwell, Keith H.
AU - Lenke, Lawrence G.
AU - Erickson, Mark
PY - 2011/6/15
Y1 - 2011/6/15
N2 - Study Design. Clinical study correlating preoperative pulmonary function tests (PFTs) to radiographic measures of thoracic deformity severity in adolescent idiopathic scoliosis (AIS) patients. Objective. To determine (1) the incidence of clinically relevant (<65% predicted value) pulmonary impairment in AIS patients; (2) if patients with more severe deformity have greater impairment of PFTs than those with lesser deformity; (3) the effect, if any, of juvenile onset deformity (onset < age 10) on preoperative PFTs. Summary of Background Data. Patients with late-onset (adolescent) spinal deformity are generally believed to have no respiratory morbidity except in severe curves exceeding 100°. Methods. A large multicenter database of surgically treated AIS patients with Lenke 1 to Lenke 4 curves was queried to report preoperative PFTs and correlate them with radiographic measures of coronal, sagittal, and axial plane deformities. Results. Nineteen percent of 858 patients had <65% predicted forced expiratory volume in 1 second (FEV1 ) and forced vital capacity (FVC) before surgery, and had larger main thoracic (MT) curves and greater axial rotation than those with predicted PFT values >65%. Patients with MT curves >70°, and especially >80°; proximal thoracic (PT) curves which were >30° or structural; or T5-T12 kyphosis <10° had significantly(P ≤ 0.001) lower FEV1 or FVC compared to those with less deformity. Axial plane deformity did not correlate with PFT impairment. Juvenile-onset patients had greater PFT impairment than AIS patients, along with slightly larger MT curves. Patients who were braced before surgery had worse PFTs than those had no treatment before surgery. Conclusion. Preoperative PFTs are clinically impaired in 19% of AIS patients, and correlate significantly with the MT and sagittal plane deformity severity, and with PT curve severity to a lesser degree. PFTs do not correlate with degree of axial deformity. From a purely pulmonary standpoint, attention directed to coronal and sagittal plane deformity correction appears warranted, to address the specific deformities which are associated with PFT impairment.
AB - Study Design. Clinical study correlating preoperative pulmonary function tests (PFTs) to radiographic measures of thoracic deformity severity in adolescent idiopathic scoliosis (AIS) patients. Objective. To determine (1) the incidence of clinically relevant (<65% predicted value) pulmonary impairment in AIS patients; (2) if patients with more severe deformity have greater impairment of PFTs than those with lesser deformity; (3) the effect, if any, of juvenile onset deformity (onset < age 10) on preoperative PFTs. Summary of Background Data. Patients with late-onset (adolescent) spinal deformity are generally believed to have no respiratory morbidity except in severe curves exceeding 100°. Methods. A large multicenter database of surgically treated AIS patients with Lenke 1 to Lenke 4 curves was queried to report preoperative PFTs and correlate them with radiographic measures of coronal, sagittal, and axial plane deformities. Results. Nineteen percent of 858 patients had <65% predicted forced expiratory volume in 1 second (FEV1 ) and forced vital capacity (FVC) before surgery, and had larger main thoracic (MT) curves and greater axial rotation than those with predicted PFT values >65%. Patients with MT curves >70°, and especially >80°; proximal thoracic (PT) curves which were >30° or structural; or T5-T12 kyphosis <10° had significantly(P ≤ 0.001) lower FEV1 or FVC compared to those with less deformity. Axial plane deformity did not correlate with PFT impairment. Juvenile-onset patients had greater PFT impairment than AIS patients, along with slightly larger MT curves. Patients who were braced before surgery had worse PFTs than those had no treatment before surgery. Conclusion. Preoperative PFTs are clinically impaired in 19% of AIS patients, and correlate significantly with the MT and sagittal plane deformity severity, and with PT curve severity to a lesser degree. PFTs do not correlate with degree of axial deformity. From a purely pulmonary standpoint, attention directed to coronal and sagittal plane deformity correction appears warranted, to address the specific deformities which are associated with PFT impairment.
KW - Adolescent idiopathic scoliosis
KW - Impaired pulmonary function
KW - Thoracic coronal and sagittal plane deformity
UR - http://www.scopus.com/inward/record.url?scp=79959956345&partnerID=8YFLogxK
U2 - 10.1097/BRS.0b013e3181f8c931
DO - 10.1097/BRS.0b013e3181f8c931
M3 - Article
C2 - 21270699
AN - SCOPUS:79959956345
SN - 0362-2436
VL - 36
SP - 1096
EP - 1102
JO - Spine
JF - Spine
IS - 14
ER -