Non-surgical approaches to the management of chest wall deformities

Chest wall deformities in children encompass a broad spectrum of disorders but pectus excavatum and carinatum are by far the most common. Treatment varies substantially by center, and depends on patient symptoms, severity of disease, and surgeon preference. Historically, surgical approaches were the mainstay of treatment for these disease processes but new advances in non-surgical approaches have demonstrated reasonable results in select patients. These non-surgical approaches include vacuum bell therapy, autologous fat grafting and hyaluronic acid injections for pectus excavatum, and orthotic brace therapy for pectus carinatum. There is debate with regards to optimal patient selection for these non-surgical approaches, as well as other barriers including reimbursement issues. This paper will review the current non-surgical approaches to chest wall deformities available, including optimal patient selection, treatment protocols, indications, contraindications, and outcomes.

Salvage treatment of acute respiratory failure after autogenous tissue flap transplantation for chronic empyema with chest wall sinus: a case report and literature review

BACKGROUND

Chronic empyema with chest wall sinus is a difficult and complex disease caused by multiple causative factors. It is difficult to control local infection due to its possible combination of bronchopleural fistula (BPF) and residual bone.The relevant literature emphasizes some risk factors for empyema progression after pneumonectomy, while the correlation between empyema and BPF after pneumonectomy increases mortality by infecting the remaining lungs. After pneumonectomy, the lung function of the contralateral side is particularly important.

CASE PRESENTATION

This paper reports a 62-year-old male patient who underwent right pneumonectomy for squamous cell carcinoma of the lung 12 years ago and began to develop empyema with anterior chest wall sinus 3 years ago. After admission, chest computed tomography (CT) showed right pleural effusion and formation of chest wall sinus. According to his clinical symptoms and imaging examination, he was diagnosed as chronic empyema with chest wall sinus.Due to the huge residual cavity of the patient,the clinical effect of using free vastus lateralis myocutaneous flap combined with pedicled pectoralis major muscle flap to fill the abscess cavity was satisfactory,but acute respiratory failure occurred due to left lung aspiration pneumonia after operation.

CONCLUSIONS

After a series of treatment measures such as tracheal cannula, tracheotomy, anti-infection, maintenance of circulatory stability, and rehabilitation training, the patient was ultimately rescued and cured. Postoperative follow-up showed that the muscle flaps survived and empyema was eliminated.

The boundary of posterior to level V region and the theoretical feasibility of irradiation dose reduction of level Va in nasopharyngeal carcinoma

The lymph node involvement in the posterior to level V (PLV) region is mainly observed in nasopharyngeal carcinoma (NPC). Recently, we have reported the distribution of metastatic lymph nodes in the PLV region and there are correlations between the neck node levels (NNL) of NPC, but what is the boundary of the PLV region and how to delineate it remains unclear, and we further to elaborate whether the bilateral level Va should be covered as intermediate-risk nodal regions (CTVn2, about 60 Gy equivalent) for all T and N categories based on these correlations. A total of 1021 consecutive NPC patients with N1-3 stage from January 2012 to December 2020 were reviewed. The lymph node metastasis level of each patient was evaluated according to the updated guidelines proposed in 2013. According to the distribution pattern of lymph node metastasis and the anatomical structure in the PLV region, the boundaries of PLV region was delineated, and whether it is appropriate to cover the bilateral level Va as CTVn2 for all the NPC patients was further discussed. The correlations of level Va with other NNL were studied using logistic regression model. The cranial boundary of PLV region is the caudal border of cricoid cartilage, the caudal boundary is the plane serratus anterior muscle begins to appear, the anterior boundary is the anterior border of trapezius, and the posterior boundary is the convergence of levator scapulae and trapezius. Laterally, the PLV region is limited by the medial edge of trapezius and medially by the lateral surface of levator scapulae. The nodal spread in level Va is based on the lymph node metastasis of level IIb in NPC. The PLV region is a missing NNL of head and neck tumors, especially in NPC. The proposed boundaries of the PLV region can provide a preliminary proposal for the further revision of NNL in head and neck tumors. It is theoretically feasible to reduce the prophylactic irradiation dose of the bilateral level Va in patients with N0 stage or with isolated metastases in level VIIa.

Scapular dislocation following radical surgical excision of lung sarcomatoid carcinoma: A rare case report

RATIONALE

Scapular prolapse is a rare complication of thoracotomy. Only a few cases of scapular prolapse after thoracotomy have been reported. Here, we report the case of a 52-year-old male patient who underwent standard posterior thoracotomy for lung sarcomatoid carcinoma invading the left upper chest wall.

PATIENT CONCERNS

The surgery was performed to remove some ribs and chest wall muscles; however, no reconstruction or repair of the chest wall defect was performed. The patient experienced a sharp pain and severe limitation of movement of the left shoulder within 1 month of receiving adjuvant therapy.

DIAGNOSES

The patient was diagnosed with left intrathoracic scapular prolapse after careful consideration of medical history, physical examination, and chest radiography.

INTERVENTIONS

We performed closed manual reduction because the patient refused to undergo surgery.

OUTCOMES

The patient's shoulder pain and movement limitation were significantly relieved, but the symptoms relapsed. After repeated closed manual reduction, the patient was instructed not to abduct the shoulder joint above 90°. The patient did not relapse during a 1-year observation period.

CONCLUSION

If scapular prolapse occurs, manual or surgical reduction can be selected based on the needs. If a patient refuses to undergo surgery, manual reduction can be an effective treatment method.

The frequency and presentation of upper thoracic spinous process deviations, their relationship to articular morphology, and the potential influence on static palpation techniques

BACKGROUND

Static palpation of vertebral spinous process deviations from the midline are often utilized by manual therapists as a means to determine area for treatment of manipulable lesions. Previous research has discussed the diagnostic validity of this technique, but no correlation to vertebral morphology has been presented.

AIM

To evaluate the frequency and presentation of vertebral spinous process deviations and their relationship with articular morphology, and the impact this may have in terms of static palpation techniques in the upper thoracic spine.

SETTING

This study was conducted on human T1-T6 vertebrae.

METHOD

A skeletal sample consisting of 58 humans T1-T6 vertebrae were photographed and linear and angular measurements taken utilizing ImageJ software and non-metric visual observations.

RESULTS

Spinous process deviations in the entire sample group (n = 348) were found to occur in a frequency ranging from 19% (n = 11) at T1 to 41.4% (n = 24) at T3. However, when evaluated in terms of frequency within an individual's T1-T6, 83.3% (n = 25) of males and 67.86% (n = 19) of females demonstrated this feature, with an overall incidence of 77.59% (n = 45). Age of individuals did not show an increase in frequency, and no clear pattern could be identified regarding metric measurements and its presence.

CONCLUSION

Spinous process deviations in the upper thoracic spine are most probably the result of random normal variations between individuals and are more frequent in males. Static palpation without pain criteria is not a reliable diagnostic technique to determine areas needing manual treatment, as these may be considered normal osseous anatomical variations.

A medication reconciliation failure: A case report and incident analysis

BACKGROUND

Medication reconciliation is advocated to ensure the continuity, safety, and effective use of medicines across transitions of care.

CASE REPORT

In this report, we describe the case of a 90-year-old female with previous diagnoses of atrial fibrillation and cutaneous metastatic breast cancer presenting with bilateral ulcerative lesions on the chest wall. The patient was diagnosed with Deep Vein Thrombosis at the Emergency Department and started on rivaroxaban, although the patient was already taking edoxaban. This therapeutic duplication was noticed only one week later, even though she was already experiencing significant bleeding managed through a prescribing cascade. Despite the technical error (action-based), it is possible to identify several weaknesses in the organisation's structure, which provided a trajectory of accident opportunity.

CONCLUSION

Anticoagulants are ranked first for the highest priority to receive a medication reconciliation. To achieve an optimal level of medication reconciliation, we ought to recognise and correct latent failures.

The Frontal Phocomelia in a 3-Year-Old Girl

Background: Phocomelia is a congenital limb deformity in which the proximal part of the upper or lower limb does not develop. Occasionally the malformed limb may be located ectopically. Case report: We present a frontal phocomelia in a three-year-old girl with right-hand phocomelia and thoracoschisis. The patient's arm was connected directly from the front of the chest, with a rudimentary thumb and two fingers. The truncated arm was not functional. The acromioclavicular joint was abnormal and ectopic, the limb articulated with the medial side of sternum. The thoracoschisis manifested as eventration of the right liver lobe and right side of chest wall. Conclusion: Ectopic phocomelia can be associated with thoracoschisis, it can be nonfunctional, and can articulate with the sternum.

A robust treatment planning approach for chest motion in postmastectomy chest wall intensity modulated radiation therapy

PURPOSE

Chest wall postmastectomy radiation therapy (PMRT) should consider the effects of chest wall respiratory motion. The purpose of this study is to evaluate the effectiveness of robustness planning intensity modulated radiation therapy (IMRT) for respiratory movement, considering respiratory motion as a setup error.

MATERIAL AND METHODS

This study analyzed 20 patients who underwent PMRT (10 left and 10 right chest walls). The following three treatment plans were created for each case and compared. The treatment plans are a planning target volume (PTV) plan (PP) that covers the PTV within the body contour with the prescribed dose, a virtual bolus plan (VP) that sets a virtual bolus in contact with the body surface and prescribing the dose that includes the PTV outside the body contour, and a robust plan (RP) that considers respiratory movement as a setup uncertainty and performs robust optimization. The isocenter was shifted to reproduce the chest wall motion pattern and the doses were recalculated for comparison for each treatment plan.

RESULT

No significant difference was found between the PP and the RP in terms of the tumor dose in the treatment plan. In contrast, VP had 3.5% higher PTV Dmax and 5.5% lower PTV V95% than RP (p < 0.001). The RP demonstrated significantly higher lung V20Gy and Dmean by 1.4% and 0.4 Gy, respectively, than the PP. The RP showed smaller changes in dose distribution affected by chest wall motion and significantly higher tumor dose coverage than the PP and VP.

CONCLUSION

We revealed that the RP demonstrated comparable tumor doses to the PP in treatment planning and was robust for respiratory motion compared to both the PP and the VP. However, the organ at risk dose in the RP was slightly higher; therefore, its clinical use should be carefully considered.

Breast Pain Differential: Mondor's Disease of the Breast

Breast pain is a common concern among women in primary care clinics. A rare cause of breast pain is Mondor's disease (MD), which can present as an acute, painful, erythematous, cord-like induration on the breast or anterior chest wall. The disorder is caused by sclerosing superficial thrombophlebitis of the anterolateral thoracoabdominal wall veins. There does not appear to be a racial or ethnic propensity for this condition; however, it is important to understand that it may be more difficult to see in darker skin types (Fitzpatrick skin types IV-VI) and requires close attention on physical exam. The cause of MD is poorly understood but may be related to direct trauma, strenuous exercise, or hormone changes. We review a case of a 54-year-old woman who presented with an anterior chest wall palpable cord, better visualized with adequate lighting and skin traction, ultimately diagnosed as MD based on clinical findings and imaging studies. Mondor's disease often resolves spontaneously with supportive care, as in this patient's case; however, clinicians should be aware of this rare cause of breast pain and its association with hypercoagulable state, vasculitis, and breast cancer.

Non-Invasive Assessment of Abdominal/Diaphragmatic and Thoracic/Intercostal Spontaneous Breathing Contributions

(1) Background: Technically, a simple, inexpensive, and non-invasive method of ascertaining volume changes in thoracic and abdominal cavities are required to expedite the development and validation of pulmonary mechanics models. Clinically, this measure enables the real-time monitoring of muscular recruitment patterns and breathing effort. Thus, it has the potential, for example, to help differentiate between respiratory disease and dysfunctional breathing, which otherwise can present with similar symptoms such as breath rate. Current automatic methods of measuring chest expansion are invasive, intrusive, and/or difficult to conduct in conjunction with pulmonary function testing (spontaneous breathing pressure and flow measurements). (2) Methods: A tape measure and rotary encoder band system developed by the authors was used to directly measure changes in thoracic and abdominal circumferences without the calibration required for analogous strain-gauge-based or image processing solutions. (3) Results: Using scaling factors from the literature allowed for the conversion of thoracic and abdominal motion to lung volume, combining motion measurements correlated to flow-based measured tidal volume (normalised by subject weight) with R2 = 0.79 in data from 29 healthy adult subjects during panting, normal, and deep breathing at 0 cmH2O (ZEEP), 4 cmH2O, and 8 cmH2O PEEP (positive end-expiratory pressure). However, the correlation for individual subjects is substantially higher, indicating size and other physiological differences should be accounted for in scaling. The pattern of abdominal and chest expansion was captured, allowing for the analysis of muscular recruitment patterns over different breathing modes and the differentiation of active and passive modes. (4) Conclusions: The method and measuring device(s) enable the validation of patient-specific lung mechanics models and accurately elucidate diaphragmatic-driven volume changes due to intercostal/chest-wall muscular recruitment and elastic recoil.

Better late than never-a single-center review of delayed rib fixation for symptomatic rib fractures and nonunions

BACKGROUND

Surgical stabilization of rib fractures (SSRFs) has become an emerging therapy for treatment of patients with rib fractures. More commonly, it is used in the acute setting; however, delayed SSRF can be utilized for symptomatic rib fracture nonunions. Here, we describe our institution's experience with delayed SSRF, hypothesizing it is safe and resolves patient symptoms.

METHODS

This is a retrospective review of patients presenting to our Level I trauma center to undergo delayed SSRF for symptomatic nonunions from January 2017 to September 2022. Delayed SSRF was defined as SSRF over 2 weeks in the outpatient setting. Basic demographics were obtained. Outcomes of interest included mean pain score (preoperatively and postoperatively), intensive care unit (ICU) and hospital length of stay (LOS), and resolution of preoperative symptoms, specifically chest wall instability, with return to activities of daily living (ADLs).

RESULTS

Forty-four patients met inclusion criteria with a total of 156 symptomatic nonunion rib fractures that received delayed SSRF. The average age was 59.2 ± 11.9 years and median number of days from injury to SSRF was 172.5 (interquartile range, 27.5-200). The average number rib fractures plated per patient 3.5 ± 1.8. Only three patients required ICU admission postoperatively for no longer than 2 days. Median hospital LOS was 2 days (interquartile range 1-3 days). Average preoperative and postoperative pain score was 6.8 ± 1.9 and 2.02 ± 1.5, respectively ( p < 0.001). Chest wall instability and preoperative symptoms resolved in 93.2% of patients postoperatively ( p < 0.001). Two patients (4.5%) had postoperative complications that resolved after additional surgical intervention. Rib fracture healing was demonstrated on radiographic imaging during postoperative follow-up.

CONCLUSION

Delayed SSRF is safe and demonstrates significant resolution of preoperative symptoms by decreasing pain, improving chest wall stability, and allowing patients to return to activities of daily living.

LEVEL OF EVIDENCE

Therapeutic/Care Management; Level IV.

Injury pattern and clinical outcome in patients with and without chest wall injury after cardiopulmonary resuscitation

BACKGROUND

Cardiopulmonary resuscitation (CPR), although lifesaving may cause chest wall injury (CWI) because of the physical force exerted on the thorax. The impact of CWI on clinical outcome in this patient group is unclear. The primary aim of this study was to investigate the incidence of CPR-related CWI and the secondary aim to study injury pattern, length of stay (LOS), and mortality in patients with and without CWI.

METHODS

This is a retrospective study of adult patients who were admitted to our hospital due to cardiac arrest (CA) during 2012 to 2020. Patients were identified in the Swedish CPR Registry and those undergoing CT of the thorax within 2 weeks after CPR were included. Patients with traumatic CA, chest wall surgery prior or after CA were excluded. Demographic data, type and length of CPR, type of CWI, LOS on mechanical ventilator (MV), in intensive care unit (ICU) and in hospital (H), and mortality were studied.

RESULTS

Of 1,715 CA patients, 245 met the criteria for inclusion. The majority (79%) of the patients suffered from CWI. Chondral injuries and rib fractures were more common than sternum fractures (95% vs. 57%), and 14% had a radiological flail segment. Patients with CWI were older (66.5 ± 15.4 vs. 52.5 ± 15.2, p < 0.001). No difference was seen in MV-LOS (3 [0-43] vs. 3 [0-22]; p = 0.430), ICU-LOS (3 [0-48] vs. 3 [0-24]; p = 0.427), and H-LOS (5.5 [0-85] vs. 9.0 [1-53]; p = 0.306) in patients with or without CWI. Overall mortality within 30 days was higher with CWI (68% vs. 47%, p = 0.007).

CONCLUSION

Chest wall injuries are common after CPR and 14% of patients had a flail segment on CT. Elderly patients have an increased risk of CWI, and a higher overall mortality is seen in patients with CWI.

LEVEL OF EVIDENCE

Prognostic and Epidemiological; Level IV.

Surgical management of traumatic sternal body nonunions: Technical tricks and clinical experience

BACKGROUND

Rarely, traumatic sternum fractures may result in nonunion, which can have drastic, negative implications. Literature on traumatic sternal nonunion reconstruction outcomes is limited to case reports. We present the surgical principles and report clinical outcomes for seven patients following surgical reconstruction of a traumatic sternal body nonunion.

METHODS

Consecutive adult patients with a nonunion after a traumatic sternum fracture who underwent reconstruction using locking plate technology and iliac crest bone graft at a Level I trauma center from 2013 to 2021 were identified. Demographic, injury, and surgery data was collected, and postoperative patient-reported outcome (PRO) scores were obtained. Patient-reported outcome scores included the one-question single assessment numeric evaluation (SANE), and the combined 10-question global physical health and global mental health values. Injuries were classified and all fractures were mapped onto a sternum template. Postoperative radiographs were reviewed for union.

RESULTS

Of the study's seven patients, five were female, and the mean age was 58 years. Mechanism of injury included motor vehicle collision (5) and blunt object chest trauma (2). The mean time from initial fracture to nonunion fixation was 9 months. Four of the seven patients achieved in-clinic follow-up at ≥12 months (mean = 14.3 months), while the other three achieved ≥6 months of in-clinic follow-up. Six patients completed outcomes surveys ≥12 months after surgery (mean = 28.9 months). Mean PRO scores at final follow-up included: SANE of 75 (out of 100), and global physical health and global mental health of 44 and 47, respectively (US population mean = 50).Six of seven patients achieved known radiographic union.

CONCLUSION

We describe an effective and practical method of achieving stable fixation in traumatic sternal body nonunions as evidenced by the positive clinical outcomes of a seven-patient series. Despite the variation in presentation and fracture morphology of this rare injury, the surgical technique and principles outlined can serve as a useful tool for chest wall surgeons.

LEVEL OF EVIDENCE

Therapeutic/Care Management; Level IV.

Health care utilization outcomes in patients with blunt chest wall trauma following discharge from the emergency department: A retrospective, observational data-linkage study

BACKGROUND

Although much is published reporting clinical outcomes in the patients with blunt chest wall trauma who are admitted to hospital from the ED, less is known about the patients' recovery when they are discharged directly without admission. The aim of this study was to investigate the health care utilization outcomes in adult patients with blunt chest wall trauma, discharged directly from ED in a trauma unit in the United Kingdom.

METHODS

This was a longitudinal, retrospective, single-center, observational study incorporating analysis of linked datasets, using the Secure Anonymised Information Linkage databank for admissions to a trauma unit in the Wales, between January 1, 2016, and December 31, 2020. All patients 16 years or older with a primary diagnosis of blunt chest wall trauma discharged directly home were included. Data were analyzed using a negative binomial regression model.

RESULTS

There were 3,205 presentations to the ED included. Mean age was 53 years, 57% were male, with the predominant injury mechanism being a low velocity fall (50%). 93% of the cohort sustained between 0 and 3 rib fractures. Four percent of the cohort were reported to have chronic obstructive pulmonary disease, and 4% using preinjury anticoagulants. On regression analysis, inpatient admissions, outpatient appointments and primary care contacts all significantly increased in the 12-week period postinjury, compared with the 12-week period preinjury (odds ratio [OR], 1.63; 95% confidence interval [CI], 1.33-1.99; p < 0.001; OR, 1.28; 95% CI, 1.14-1.43; p < 0.001; OR, 1.02; 95% CI, 1.01-1.02; p < 0.001, respectively). Risk of health care resource utilization increased significantly with each additional year of age, chronic obstructive pulmonary disease and preinjury anticoagulant use (all p < 0.05). Social deprivation and number of rib fracture did not impact outcomes.

CONCLUSION

The results of this study demonstrate the need for appropriate signposting and follow-up for patients with blunt chest wall trauma presenting to the ED, not requiring admission to the hospital.

LEVEL OF EVIDENCE

Prognostic and Epidemiological; Level IV.

Effect of chest wall mobilization on respiratory muscle function in patients with severe chronic obstructive pulmonary disease (COPD): A randomized controlled trial

BACKGROUND

Clinical trials have demonstrated positive correlation between pulmonary function and chest wall expansion in COPD. Decrease in chest wall expansion in patients with COPD compromises rib cage mobility and functional length of respiratory muscles that ultimately jeopardize the efficacy and function of respiratory system.

METHOD

Thirty male adults (mean age: 74.97 ± 6.29) suffered with severe COPD were randomly allocated to either experimental group (chest wall mobilizations) or control group. Both groups received standardized education and walking exercise (twice/week) for 6 weeks. Patients in experimental group received additional chest wall mobilizations that include stretching and joints mobilization. Pulmonary function, respiratory muscle strength, thoracic excursion, cervical and thoracic range of movement were evaluated at baseline, post-program and at 3-month follow-up.

RESULTS

There were significantly greater improvements in respiratory muscle strength, thoracic excursion and thoracic range of movement (p < 0.01) except thoracic flexion. Lower thoracic excursion is strongly associated with increase in maximum inspiratory pressure (β = 13.64, p < 0.001) and maximum expiratory pressure (β = 16.23, p < 0.001). Thoracic range of movement especially extension (p < 0.001) and bilateral rotation (p < 0.01) exhibit a strong relationship with increase in lower thoracic excursion (adjusted R2 = 0.876) as shown in multiple regression analysis.

CONCLUSION

Additional chest wall mobilization in the rehabilitation of patients with COPD is likely to enhance thoracic extension and rotation which increase lower thoracic excursion. This significant improvement in chest expansion capacity allows respiratory muscles to work at an optimal functional length which result in greater respiratory muscle strength in patients with severe COPD.

Chest Wall Injury Society recommendation for surgical stabilization of nonunited rib fractures to decrease pain, reduce opiate use, and improve patient reported outcomes in patients with rib fracture nonunion after trauma

BACKGROUND

Rib fractures are common injuries which can be associated with acute pain and chronic disability. While most rib fractures ultimately go on to achieve bony union, a subset of patients may go on to develop non-union. Management of these nonunited rib fractures can be challenging and variability in management exists.

METHODS

The Chest Wall Injury Society's Publication Committee convened to develop recommendations for use of surgical stabilization of nonunited rib fractures (SSNURF) to treat traumatic rib fracture nonunions. PubMed, Embase, and the Cochrane database were searched for pertinent studies. Using a process of iterative consensus, all committee members voted to accept or reject the recommendation.

RESULTS

No identified studies compared SSNURF to alternative therapy and the overall quality of the body of evidence was rated as low. Risk of bias was identified in all studies. Despite these limitations, there is lower-quality evidence suggesting that SSNURF may be beneficial for decreasing pain, reducing opiate use, and improving patient reported outcomes among patients with symptomatic rib nonunion. However, these benefits should be balanced against risk of symptomatic hardware failure and infection.

CONCLUSION

This guideline document summarizes the current CWIS recommendations regarding use of SSNURF for management of rib nonunion.

LEVEL OF EVIDENCE

Therapeutic/Care Management; Level IV.

Novel nomogram for predicting paradoxical chest wall movement in patients with flail segment of traumatic rib fracture: a retrospective cohort study

Flail chest is a severe injury to the chest wall and is related to adverse outcomes. A flail chest is classified as the physiologic, paradoxical motion of a chest wall or flail segment of rib fracture (RFX). We hypothesized that patients with paradoxical chest wall movement would present different clinical features from patients with a flail segment. This retrospective observational study included patients with blunt chest trauma who visited our level 1 trauma center between January 2019 and October 2022 and were diagnosed with one or more flail segments by computed tomography. The primary outcome of our study was a clinically diagnosed visible, paradoxical chest wall motion. We used the least absolute shrinkage and selection operator (LASSO) logistic regression model to minimize overfitting. After a feature selection using the LASSO regression model, we constructed a multivariable logistic regression (MLR) model and nomogram. A total of five risk factors were selected in the LASSO model and applied to the multivariable logistic regression model. Of these, four risk factors were statistically significant: the total number of RFX (adjusted OR [aOR], 1.28; 95% confidence interval [CI], 1.09-1.49; p = 0.002), number of segmental RFX including Grade III fractures (aOR, 1.78; 95% CI, 1.14-2.79; p = 0.012), laterally located primary fracture lines (aOR, 4.00; 95% CI, 1.69-9.43; p = 0.002), and anterior-lateral flail segments (aOR, 4.20; 95% CI, 1.60-10.99; p = 0.004). We constructed a nomogram to predict the personalized probability of the flail motion. A novel nomogram was developed in patients with flail segments of traumatic RFX to predict paradoxical chest wall motion. The number of RFX, Grade III segmental RFX, and the location of the RFX were significant risk factors.

Cigarette smoking and disproportionate changes of thoracic skeletal muscles in low-dose chest computed tomography

Association between smoking intensity and the quantity and quality of thoracic skeletal muscles (TSMs) remains unexplored. Skeletal muscle index (SMI; skeletal muscle area/height2) and percentage of normal attenuation muscle area (NAMA%) were measured to represent the quantity and quality of the skeletal muscles, respectively, and quantification was performed in pectoralis muscle at aortic arch (AA-PM), TSM at carina (C-TSM), erector spinae muscle at T12 (T12-ESM), and skeletal muscle at L1 (L1-SM). Among the 258 men (median age, 62 years [IQR: 58-69]), 183 were current smokers (median smoking intensity, 40 pack-years [IQR: 30-46]). SMI and NAMA% of AA-PM significantly decreased with pack-year (β =  - 0.028 and - 0.076; P < 0.001 and P = 0.021, respectively). Smoking intensity was inversely associated with NAMA% of C-TSM (β =  - 0.063; P = 0.001), whereas smoking intensity showed a borderline association with SMI of C-TSM (β =  - 0.023; P = 0.057). Smoking intensity was associated with the change in NAMA% of L1-SM (β =  - 0.040; P = 0.027), but was not associated with SMI of L1-SM (P > 0.05). Neither NAMA% nor SMI of T12-ESM was affected by smoking intensity (P > 0.05). In conclusion, smoking intensity was associated with the change of TSMs. Its association varied according to the location of TSMs, with the most associated parts being the upper (AA-PM) and middle TSMs (C-TSM).

Human Respiration Rate Measurement with High-Speed Digital Fringe Projection Technique

This paper proposes a non-contact continuous respiration monitoring method based on Fringe Projection Profilometry (FPP). This method aims to overcome the limitations of traditional intrusive techniques by providing continuous monitoring without interfering with normal breathing. The FPP sensor captures three-dimensional (3D) respiratory motion from the chest wall and abdomen, and the analysis algorithms extract respiratory parameters. The system achieved a high Signal-to-Noise Ratio (SNR) of 37 dB with an ideal sinusoidal respiration signal. Experimental results demonstrated that a mean correlation of 0.95 and a mean Root-Mean-Square Error (RMSE) of 0.11 breaths per minute (bpm) were achieved when comparing to a reference signal obtained from a spirometer.