Flail chest - Nursing Case Study

Pathophysiology

• Primary mechanism: Flail chest occurs when multiple consecutive ribs are fractured in multiple places, leading to a segment of the chest wall that moves independently, or paradoxically, from the rest of the thoracic cage during respiration. This impairs the mechanics of breathing, as the flail segment is sucked inward during inspiration and pushed outward during expiration, reducing respiratory efficiency.

• Secondary mechanism: This paradoxical movement disrupts normal intrathoracic pressure changes, leading to compromised ventilation. The ineffective expansion of the lung on the affected side can result in reduced alveolar ventilation, contributing to hypoxemia.

• Key complication: The impaired ventilation can lead to respiratory distress and inadequate oxygenation if not promptly managed, necessitating interventions such as mechanical ventilation or surgical stabilization to restore effective respiratory mechanics.

Patient Profile

Demographics:

56-year-old male, construction worker

History:

• Key past medical history: Hypertension, smoker for 30 years, occasional COPD exacerbations

• Current medications: Lisinopril 10 mg daily, Albuterol inhaler as needed

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Severe chest pain and difficulty breathing following a fall at the construction site

• Key symptoms: Sharp chest pain, shortness of breath, bruising and swelling on the chest, paradoxical chest movement

• Vital signs: Blood pressure 148/92 mmHg, heart rate 110 bpm, respiratory rate 28 breaths per minute, SpO2 88% on room air, temperature 37.2°C (99°F)

Section 1

As the patient is further evaluated in the emergency department, new diagnostic results reveal significant findings that necessitate immediate clinical intervention. A chest X-ray confirms the presence of a flail segment involving the left anterolateral ribs, with three ribs fractured in multiple places. Additionally, a CT scan of the thorax shows a developing left-sided pneumothorax, likely contributing to the patient's hypoxemia and respiratory distress. Laboratory tests indicate an arterial blood gas (ABG) analysis with a pH of 7.32, PaCO2 of 52 mmHg, and PaO2 of 60 mmHg, highlighting respiratory acidosis and worsening oxygenation. These results signal the need for prompt action to prevent further deterioration.

In response to these findings, the medical team initiates supplemental oxygen therapy, increasing the patient's FiO2 to achieve a target SpO2 of greater than 92%. Despite this, the patient's respiratory rate remains elevated at 30 breaths per minute, and he continues to exhibit signs of respiratory distress, including accessory muscle use and tachycardia, with a heart rate now at 120 bpm. The patient is clearly struggling to maintain adequate gas exchange due to the compromised mechanics of his chest wall and the pneumothorax, prompting the consideration of more advanced interventions.

Recognizing the potential for rapid decompensation, the team prepares for the possibility of chest tube insertion to address the pneumothorax and improve ventilation. Additionally, discussions are underway regarding the need for mechanical ventilation to stabilize the patient's respiratory status and allow for surgical consultation for potential rib fixation. The evolving situation demands careful monitoring and timely decision-making to address the underlying complications and prevent the escalation of his respiratory failure.

Section 2

As the medical team moves forward with the plan for chest tube insertion, the patient's status begins to evolve, highlighting the need for swift intervention. The patient, John, a 45-year-old male, experiences a sudden increase in respiratory distress, with his SpO2 dropping to 85% despite supplemental oxygen. His blood pressure begins to decrease, measured at 90/60 mmHg, indicating a potential compromise in hemodynamic stability. The jugular venous distension observed on assessment raises concerns of tension pneumothorax development, an emergent complication that could rapidly lead to cardiovascular collapse.

In response, the team quickly decides to proceed with an emergency needle decompression to temporarily relieve the pressure in the thoracic cavity. This intervention results in an immediate improvement in John's respiratory effort and partial stabilization of his hemodynamics, with his heart rate decreasing to 110 bpm and his SpO2 rising back to 90%. Concurrently, preparations are expedited for definitive chest tube placement to ensure continued relief of intrathoracic pressure and re-expansion of the lung.

While the needle decompression provides temporary relief, the patient's ABG analysis post-intervention shows persistent respiratory acidosis with a pH of 7.34, PaCO2 of 50 mmHg, and PaO2 of 65 mmHg. These values underscore the need for ongoing respiratory support, and the team deliberates the initiation of mechanical ventilation to optimize gas exchange and reduce the work of breathing. The situation demands careful balancing of interventions, with close monitoring to prevent further complications such as acute respiratory distress syndrome (ARDS) and to plan for potential surgical stabilization of the flail chest.

Section 3

As preparations for mechanical ventilation are underway, a sudden new complication arises. John begins to exhibit signs of increased agitation and confusion, suggesting inadequate cerebral perfusion. His heart rate, which had previously stabilized, now spikes to 130 bpm, and his blood pressure drops further to 85/55 mmHg. The team recognizes that these symptoms may indicate the onset of shock, potentially hypovolemic in nature due to internal injuries and ongoing blood loss. A repeat physical examination reveals cool, clammy skin and delayed capillary refill, further corroborating the suspicion of compromised circulatory status.

In response, the team prioritizes rapid-volume resuscitation with isotonic crystalloids to restore hemodynamic stability. Concurrently, they initiate a massive transfusion protocol as a precautionary measure, understanding the risk of significant blood loss given the trauma associated with flail chest. The decision to start vasopressor support is discussed, balancing the need to maintain perfusion pressure against the risk of exacerbating the existing respiratory acidosis.

Despite these interventions, John's ABG reveals worsening metabolic acidosis with a pH of 7.28 and a bicarbonate level of 18 mEq/L, indicating that his compensatory mechanisms are overwhelmed. This development necessitates an urgent reevaluation of potential internal injuries, leading the team to expedite a CT scan of the chest and abdomen to identify any sources of hemorrhage or additional injuries. As they await imaging results, the clinical team remains vigilant, ready to address any further complications and adjust their management plan to support John through this critical phase of care.

Section 4

As the imaging results return, the team discovers a significant hemothorax on the left side, which had escaped initial detection due to the complexity of John's injuries. The CT scan reveals approximately 800 mL of blood in the pleural cavity, contributing to his increasing respiratory distress and compromised hemodynamics. Recognizing the urgency, the team prepares for a chest tube insertion to evacuate the blood and re-expand the collapsed lung, essential to improving both ventilation and circulation.

Meanwhile, John's condition continues to be precarious. His agitation decreases slightly following the initiation of the fluid resuscitation and transfusion, yet his vital signs remain unstable. His heart rate fluctuates between 120-135 bpm, and his blood pressure has only marginally improved to 90/60 mmHg. Oxygen saturation hovers around 88%, indicating persistent hypoxemia. The team decides to proceed with mechanical ventilation to optimize oxygen delivery and reduce the metabolic demands on his body. They consider the risks of positive pressure ventilation, especially in the presence of a flail chest, and plan to use lung-protective strategies to minimize the risk of further barotrauma.

As the chest tube insertion is completed, and the initial 500 mL of blood is drained, John's oxygen saturation begins to improve, rising to 92%. His respiratory rate decreases from 30 to 24 breaths per minute, indicating some relief from respiratory distress. However, the team remains on high alert for potential complications such as re-expansion pulmonary edema or further bleeding. John's metabolic acidosis shows slight improvement with a repeat ABG showing a pH of 7.32 and bicarbonate of 19 mEq/L, suggesting that the interventions are beginning to stabilize his condition, though close monitoring and continued support are essential as they navigate this critical period in his recovery.

Section 5

As the team closely monitors John following the chest tube insertion, they observe a concerning development. Despite the initial improvement in oxygen saturation and respiratory rate, his blood pressure begins to show signs of further compromise, dropping to 85/55 mmHg. His heart rate remains elevated at 130 bpm, suggesting persistent hemodynamic instability. While fluid resuscitation and blood transfusion efforts are ongoing, the team questions whether there might be a continued source of bleeding or if other complications, such as cardiac tamponade, might be contributing to his unstable condition.

A repeat chest X-ray and ultrasound are ordered to assess the status of the hemothorax and to rule out additional complications. The chest X-ray reveals a slight shift of the mediastinum towards the right, raising concerns about possible tension physiology. The ultrasound, however, does not show signs of pericardial effusion, which temporarily alleviates the immediate concern for tamponade. Yet, the team remains vigilant, considering the potential for new or evolving injuries that may have been initially obscured by the complexity of John's presentation.

Concurrently, the laboratory results highlight a new challenge. John's hemoglobin levels have dropped from 11 g/dL to 9 g/dL, indicating ongoing blood loss despite the interventions. His lactate level remains elevated at 4.5 mmol/L, reflecting tissue hypoperfusion and a continued state of metabolic acidosis. These findings prompt the team to reassess their strategy, ensuring that potential sources of bleeding are identified and controlled. Additionally, they contemplate the need for further imaging or surgical intervention, balancing the risks and benefits while continuing supportive care to stabilize John during this critical phase of recovery.