Surgical strategy for chest wall reconstruction secondary to cardiopulmonary resuscitation versus post-traumatic.

Purpose: In mechanically cardiopulmonary resuscitated (CPR) patients, chest compressions at the level of the 3rd to 5th rib on the sternum result in reproducibly similar injury patterns: parasternal osteochondral dissociation (OCS) on both sides in combination with a sternal fracture with or without an additional serial rib fracture in the anterolateral column (ALS). This injury biomechanically impairs physiological breathing, resulting in an inverse breathing pattern. Trauma patients, on the other hand, often show a mixed pattern depending on the location of the main energy. The aim of the study was to evaluate the surgical technique of chest wall reconstruction (CWR) using transsternal refixation of the 5th rib on both sides in combination with plate osteosynthesis of the sternum and to analyze its success in comparison to the surgical strategy of CWR in the context of a traumatic genesis.

Method: Data acquisition was performed using medical records of a Level I Trauma Centre in Germany and compare patients with radiologically or clinically diagnosed flail chest as a result of cardiopulmonary mechanical resuscitation (CPR). The retrospective study included patients in the period 2018-2023 after surgical CWR. The patients were either post-CPR (n = 29; CPR) or trauma patients (n = 36; trauma). The collective was described and analyzed using the digital patient file, as well as data on ICU stay and duration of ventilation or conversion to assisted ventilation modes, reason for chest wall instability, time of surgery, length of stay and mortality. As a long-term follow-up, body plethysmography was analyzed comparatively. Primary endpoints were mean length of stay in ICU, time to surgery, ventilator dependency and mortality rate. Secondary endpoints were time to transfer to rehabilitation, ventilation disorders and long term outcome.

Results: In the period 65 patients (48 m, 17w) were included, 29 of whom had been mechanically resuscitated (CPR), 36 formed to post-traumatic cohort (trauma). The CPR were significantly older (69 vs. 58 years; p-value 0.003). The duration from CPR to surgery was on average significantly longer than trauma to surgery (16.76 vs. 4.11 days). The mean length of stay in ICU were 30 days (trauma) and 45 days for CPR (significantly longer, p-value 0.0008). The mean duration of ventilation was 188 h for trauma and 593 h for CPR. Extubation or conversion to assisted, relevant de-escalating ventilation modes was possible in both groups after a mean of 38 h post-OP. Among the CPR patients, 4 died in hospital (hospital mortality: CPR 20.7% vs. trauma 5.6%), 7 (30%) were transferred to an early clinical rehabilitation and 10 were discharged to home or follow-up treatment. In the case of trauma, 5 (14.7%) were transferred to an early clinical rehabilitation and 20 were discharged to home or follow-up treatment. Bodyplethysmography 6 months after CPR / trauma showed no differences in both collectives with regard to ventilation disorders. Diffusion was prolonged in both groups, presumably due to the healing process of lungs contusion. Both showed no restriction disorders.

Conclusion: Chest wall reconstruction, including plate osteosynthesis of the sternum in combination with transsternal fixation of the 5th rib on both sides can largely restore physiological respiratory mechanics immediately after surgery and accelerate the weaning success. In the management of patients after CPR, the initial diagnosis which had indicated resuscitation, is the main focus and can often be an obstacle to extubation. Nevertheless, independent breathing can be accelerated by restoring the biomechanics through early surgical treatment using CWR and saves long-term ICU stays with the potential for further complication and resource consumption. CWR forms the essential basis for early rehabilitation of the underlying cause of resuscitation. Ventilation disorders do not occur after surgical CWR, even during the course of the procedure.