Flail chest

Flail chest
A 3D reconstruction from a CT scan showing a flail chest. Arrows mark the rib fractures.
SpecialtyEmergency medicine
SymptomsChest pain, trouble beathing[1]
ComplicationsPulmonary contusion, pneumothorax[2]
CausesBlunt chest wall trauma[2]
Risk factorsOld age, osteogenesis imperfecta[2]
Diagnostic methodBased on symptoms, supported by medical imaging[2]
Differential diagnosisAortic dissection, pulmonary embolism, sternal fracture, esophagitis[2]
TreatmentOxygen therapy, non-invasive ventilation, mechanical ventilation, pain management, surgery[2]
Frequency7% of major chest trauma[2]
Deaths15% risk[2]

Flail chest is when a segment of the rib cage becomes detached from the rest of the chest wall, due to trauma.[2] Symptoms may include chest pain and trouble beathing.[1] Complications may include pulmonary contusion (bruise of lung tissue), and pneumothorax.[2]

The cause is typically significant blunt chest wall trauma, such as may occur during a motor vehicle collision.[2] Risk factors include old age and osteogenesis imperfecta.[2] The underlying mechanism involves at least three adjacent broken ribs in at least two places, such that part of the chest wall moves independently.[2][3] This results in the flail segment moving in the opposite direction as the rest of the chest wall.[2] Diagnosis is based on symptoms, which may be supported by medical imaging.[2]

Initial management may include oxygen therapy, non-invasive ventilation, or mechanical ventilation.[2] Pain management including nerve blocks may be required.[2] Surgery, to fix the fractures, appears to result in better outcomes.[4][3] Some people following recovery have chronic pain or remain disabled.[3]

A flail chest occurs in about 7% of major chest trauma.[2] Males are more commonly affected than females.[2] The risk of death is about 15%; though is often due to associated injuries.[2] The condition was first clearly described in 1955.[3]

Signs and symptoms

Symptoms of flail chest are chest pain and shortness of breath.[5]

The paradoxical motion of the flail segment occurs due to pressure changes associated with respiration that the rib cage normally resists:

  • During normal inspiration, the diaphragm contracts and intercostal muscles pull the rib cage out. Pressure in the thorax decreases below atmospheric pressure, and air rushes in through the trachea. The flail segment will be pulled in with the decrease in pressure while the rest of the rib cage expands.
  • During normal expiration, the diaphragm and intercostal muscles relax increasing internal pressure, allowing the abdominal organs to push air upwards and out of the thorax. However, a flail segment will also be pushed out while the rest of the rib cage contracts.

Paradoxical motion is a late sign of flail segment; therefore, an absence of paradoxical motion does not mean the person does not have a flail segment.

Complications

The constant motion of the ribs in the flail segment at the site of the fracture is extremely painful, and, untreated, the sharp broken edges of the ribs are likely to eventually puncture the pleural sac and lung, possibly causing a pneumothorax. The concern about "mediastinal flutter" (the shift of the mediastinum with paradoxical diaphragm movement) does not appear to be merited.[6]

Pulmonary contusion is commonly associated with flail chest and can lead to respiratory failure. Typical paradoxical motion is associated with stiff lungs, which requires extra work for normal breathing, and increased lung resistance, which makes air flow difficult.[7] The respiratory failure from the flail chest requires mechanical ventilation and a longer stay in an intensive care unit.[8] It is the damage to the lungs from the flail segment that is life-threatening.

Causes

Diagrams depicting the paradoxical motion observed during breathing with a flail segment

The most common causes of flail chest injuries are vehicle collisions, which account for 76% of flail chest injuries.[9] Another main cause of flail chest injuries is falling. This mainly occurs in the elderly, who are more impacted by the falls as a result of their weak and frail bones, unlike their younger counterparts who can fall without being impacted as severely. Falls account for 14% of flail chest injuries.[5]

Flail chest typically occurs when three or more adjacent ribs are fractured in two or more places, allowing that segment of the thoracic wall to displace and move independently of the rest of the chest wall. Flail chest can also occur when ribs are fractured proximally in conjunction with disarticulation of costal cartilages distally. For the condition to occur, generally there must be a significant force applied over a large surface of the thorax to create the multiple anterior and posterior rib fractures. Rollover and crushing injuries most commonly break ribs at only one point, whereas for flail chest to occur a significant impact is required, breaking the ribs in two or more places.[10] This can be caused by forceful accidents such as the aforementioned vehicle collisions or significant falls. In the elderly, it can be caused by deterioration of bone, although rare. In children, the majority of flail chest injuries result from common blunt force traumas or metabolic bone diseases, including a group of genetic disorders known as osteogenesis imperfecta.[11]

Diagnosis

A chest radiograph of a flail chest associated with right sided pulmonary contusion and subcutaneous emphysema (left side of image)

Diagnosis is by physical examination performed by a physician. The diagnosis may be assisted or confirmed by use of medical imaging with either plain X ray or CT scan.

Treatment

Treatment of the flail chest initially follows the principles of advanced trauma life support. Further treatment includes:

  • Good pain management includes intercostal blocks and avoiding opioid pain medication as much as possible. This allows much better ventilation, with improved tidal volume, and increased blood oxygenation.
  • Positive pressure ventilation, meticulously adjusting the ventilator settings to avoid pulmonary barotrauma.
  • Chest tubes as required.
  • Adjustment of position to make the person most comfortable and provide relief of pain.
  • Aggressive pulmonary toilet

A person may be intubated with a double lumen tracheal tube. In a double lumen endotracheal tube, each lumen may be connected to a different ventilator. Usually one side of the chest is affected more than the other, so each lung may require drastically different pressures and flows to adequately ventilate.

Surgery

Surgical fixation can help in reducing the duration of ventilatory support and in conserving the pulmonary function.[12] Surgical intervention has also been shown to reduce the need for tracheostomy, reduces the time spent in the intensive care unit, and could reduce the risk of acquiring pneumonia after such an event.[13] Though it is unclear if it affects the risk of deaths between people treated surgically and those treated non-surgically.[13]

Physiotherapy

In order to begin a rehabilitation program for a flail chest it is important to treat the person's pain so they are able to perform the proper exercises. Due to the underlying conditions that the flail segment has caused onto the respiratory system, chest physiotherapy is important to reduce further complications. Proper positioning of the body is key, including postural alignment for proper drainage of mucous secretions.[14] The therapy will consist of a variety of postural positioning and changes in order to increase normal breathing. Along with postural repositioning, a variety of breathing exercises are also very important in order to allow the chest wall to reposition itself back to normal conditions. Breathing exercises will also include coughing procedures.[14] Furthermore, range of motion exercises are given to reduce the atrophy of the musculature.[15] With progression, resistance exercises are added to the regimen to the shoulder and arm of the side containing the injury. Moreover, trunk exercises will be introduced while sitting and will progress to during standing.[16] Hip flexion exercises can be done to expand the thorax. This is done by lying supine on a flat surface, flexing the knees and hips and bringing them in toward the chest. The knees should come in toward the chest while the person inhales, and exhale when the knees are lowered.[16] This exercise can be done in 3 sets of 6–8 repetitions with a pause in between sets. The person should always make sure to maintain controlled breaths.[16]

Eventually, the person will be progressed to walking and posture correction while walking.[16] Before the person is discharged from the hospital, the person should be able to perform mobility exercises to the core and should have attained good posture.

  • Mobilization of the chest and pectoral muscle stretch. During inspiration, the person will clasp hands behind the head and will horizontally abduct the arms.
    Mobilization of the chest and pectoral muscle stretch. During inspiration, the person will clasp hands behind the head and will horizontally abduct the arms.
  • During exhalation, the person will bend forward bringing the elbows together.
    During exhalation, the person will bend forward bringing the elbows together.

Prognosis

The death rate of people with flail chest depends on the severity of their condition, ranging from 10 to 25%.[5] Often, it is the contusion, not the flail segment, that is the main cause of respiratory problems in people with both injuries.[17]

Epidemiology

Approximately 1 out of 13 people admitted to the hospital with fractured ribs are found to have flail chest.[18]

References

  1. 1 2 "Flail Chest - Trauma - Orthobullets". www.orthobullets.com. Archived from the original on 8 November 2021. Retrieved 6 July 2022.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Perera, TB; King, KC (January 2022). "Flail Chest". PMID 30475563. {{cite journal}}: Cite journal requires |journal= (help)
  3. 1 2 3 4 Majercik, Sarah; Pieracci, Fredric M. (May 2017). "Chest Wall Trauma". Thoracic Surgery Clinics. 27 (2): 113–121. doi:10.1016/j.thorsurg.2017.01.004.
  4. ↑ Coughlin, TA; Ng, JW; Rollins, KE; Forward, DP; Ollivere, BJ (August 2016). "Management of rib fractures in traumatic flail chest: a meta-analysis of randomised controlled trials". The Bone & Joint Journal. 98-B (8): 1119–25. doi:10.1302/0301-620x.98b8.37282. PMID 27482027.
  5. 1 2 3 Athanassiadi, Kalliopi, Michalis Gerzounis, Nikolaos Theakos. Management of 150 flail chest injuries: analysis of risk factors affecting outcome. European Journal of Cardio-thoracic surgery 26. (2004). Pg 373–376.
  6. ↑ Molnar TF (2007). "(Video Assisted) thoracoscopic surgery: Getting started". J Minim Access Surg. 3 (4): 173–7. doi:10.4103/0972-9941.38912. PMC 2749201. PMID 19789679.
  7. ↑ Bemelman M, Poeze M, Blokhuis TJ, Leenen LP (2010). "Historic overview of treatment techniques for rib facturs and flail chest". Eur J Trauma Emerg Surg. 36 (5): 407–415. doi:10.1007/s00068-010-0046-5. PMC 3150827. PMID 21841952.
  8. ↑ Marasco SF, Davies AR, Cooper J, Varma D, Bennett V, Nevill R, Lee G, Bailey M, Fitzgerald M (2013). "Prospective Randomized Controlled Trial of Operative Rib Fixation in Traumatic Flail Chest". Journal of the American College of Surgeons. 216 (5): 924–932. doi:10.1016/j.jamcollsurg.2012.12.024. PMID 23415550.
  9. ↑ Borman, JB, L Aharonson-Daniel, B Savitsky, et al. Unilateral flail chest is seldom a lethal injury. Emerg Med J. 23. (2006). P. 903-905.
  10. ↑ Bjerke, H Scott (2006-06-16). "Flail Chest". eMedicine. Archived from the original on 2008-10-17. Retrieved 2007-08-01.
  11. ↑ Gipson CL, Tobias JD (2006). "Flail Chest in a Neonate Resulting from Nonaccidental Trauma". Southern Medical Journal. 99 (5): 536–538. doi:10.1097/01.smj.0000216471.54786.e5. PMID 16711322.
  12. ↑ Granetzny A; Abd El-Aal, M; Emam, E; Shalaby, A; Boseila, A (2005). "Surgical versus conservative treatment of flail chest. Evaluation of the pulmonary status". Interact Cardiovasc Thorac Surg. 4 (6): 583–7. doi:10.1510/icvts.2005.111807. PMID 17670487.
  13. 1 2 Apampa, Ayobobola A.; Ali, Ayesha; Kadir, Bryar; Ahmed, Zubair (2021-02-06). "Safety and effectiveness of surgical fixation versus non-surgical methods for the treatment of flail chest in adult populations: a systematic review and meta-analysis". European Journal of Trauma and Emergency Surgery. doi:10.1007/s00068-021-01606-2. ISSN 1863-9941. PMC 7866961. PMID 33547910.
  14. 1 2 Ciesla, Nancy D. "Chest Physical Therapy for Patients in the Intensive Care Unit". Journal of the American Physical Therapy Association (1996) 76:609–625.
  15. ↑ Kigin, Colleen M. "Chest Physical Therapy for the Postoperative or Traumatic Injury Patient". Journal of the American Physical Therapy Association (1981) 61:1724–1736.
  16. 1 2 3 4 Kumar, Senthil. "Post Operative Physiotherapy Management for Flail Chest". https://www.scribd.com/doc/59432747/Post-operative-physiotherapy-management-for-flail-chest-or-Multiple-ribs-fracture-or-Cardio-pulmonary-rehabilitation-or-physiotherapy-or-physical-ther Archived 2021-03-22 at the Wayback Machine
  17. ↑ Hemmila MR, Wahl WL (2005). "Management of the injured patient". In Doherty GM (ed.). Current Surgical Diagnosis and Treatment. McGraw-Hill Medical. p. 214. ISBN 0-07-142315-X. Archived from the original on 2022-07-03. Retrieved 2008-07-04.
  18. ↑ Richardson, J. David M.D, Lee Adams M.D, Lewis M. Flint, M.D. Selective Management of Flail Chest and Pulmonary Contusion. Department of Surgery, University of Louisville, School of Medicine, Louisville, Kentucky.
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