Pectus excavatum in motion: dynamic evaluation using real-time MRI.

OBJECTIVES: The breathing phase for the determination of thoracic indices in patients with pectus excavatum is not standardized. The aim of this study was to identify the best period for reliable assessments of morphologic indices by dynamic observations of the chest wall using real-time MRI. METHODS: In this prospective study, patients with pectus excavatum underwent morphologic evaluation by real-time MRI at 3 T between January 2020 and June 2021. The Haller index (HI), correction index (CI), modified asymmetry index (AI), and modified eccentricity index (EI) were determined during free, quiet, and forced breathing respectively. Breathing-related differences in the thoracic indices were analyzed with the Wilcoxon signed-rank test. Motion of the anterior chest wall was analyzed as well. RESULTS: A total of 56 patients (11 females and 45 males, median age 15.4 years, interquartile range 14.3-16.9) were included. In quiet expiration, the median HI in the cohort equaled 5.7 (4.5-7.2). The median absolute differences (Δ) in the thoracic indices between peak inspiration and peak expiration were ΔHI = 1.1 (0.7-1.6, p < .001), ΔCI = 4.8% (1.3-7.5%, p < .001), ΔAI = 3.0% (1.0-5.0%, p < .001), and ΔEI = 8.0% (3.0-14.0%, p < .05). The indices varied significantly during different inspiratory phases, but not during expiration (p > .05 each). Furthermore, the dynamic evaluation revealed three distinctive movement patterns of the funnel chest. CONCLUSIONS: Real-time MRI reveals patterns of chest wall motion and indicate that thoracic indices of pectus excavatum should be assessed in the end-expiratory phase of quiet expiration. KEY POINTS: • The thoracic indices in patients with pectus excavatum depend on the breathing phase. • Quiet expiration represents the best breathing phase for determining thoracic indices. • Real-time MRI can identify different chest wall motion patterns in pectus excavatum.

Bracing of Pectus Carinatum in Children: Current Practices.

BACKGROUND: Although effective, compressive orthotic bracing (COB) in children with pectus carinatum is still not standardized. This study has aimed to analyze current practices amongst members of the Chest Wall International Group (CWIG). METHODS: A web-based questionnaire was mailed to all CWIG members at 208 departments. It included 30 questions regarding diagnostic work-up, age for COB indication, type of COB used, daily wearing time, treatment duration, complications, and recurrence rate. RESULTS: Members from 44 departments have responded (institutional response rate 21.2%). A total of 93% consider COB as the first-line treatment for PC. A conventional COB (CC) is used in 59%, and the dynamic compression system (FMF) in 41%. The overall compliance rate is >80%. A total of 67% of responders consider COB to be indicated in patients <10 years. The actual wearing time is significantly shorter than the physician-recommended time (p < 0.01). FMF patients experience a significantly faster response than CC patients (p < 0.01). No recurrence of PC has been noted in 34%; recurrence rates of 10-30% have been noted in 61%. CONCLUSIONS: COB is the first-line treatment for PC with a high compliance rate. During puberty, the recurrence rate is high. Treatment standardization and follow-up until the end of puberty are recommended to enhance COB effectiveness.

Intraoperative use of the vacuum bell for elevating the sternum during the Nuss procedure.

OBJECTIVE: To evaluate the routine use of the vacuum bell for elevating the sternum during minimally invasive repair of pectus excavatum (MIRPE) (the Nuss procedure). SUBJECTS AND METHODS: This was a retrospective evaluation of a prospective database including all patients who underwent MIRPE at our institution between 2005 and 2010. Data included the patient's demographic characteristics, age at surgery, gender, Haller index, duration of surgery, and intraoperative complications. RESULTS: Fifty patients from 9 to 28 years old (average, 14.95 years) were observed, including 39 males and 11 females. The preoperative Haller index was between 3.25 and 7.4 (average, 5.05). Mean duration of surgery was 58 minutes (range, 45-92 minutes). The use of the vacuum bell led to a clear elevation of the sternum as confirmed by thoracoscopy. Advancement of the pectus introducer and placement of the pectus bar were safe, successful, and uneventful in all patients. No cardial and/or pericardial lesion was noted as well as no lesion of the mammary vessels. CONCLUSIONS: The intraoperative use of the vacuum bell during the MIRPE is safe and effective as it facilitates the retrosternal dissection and the insertion of the pectus bar. If available, we recommend the routine use of this device for MIRPE.