Respiratory distress - Nursing Case Study

Pathophysiology

• Primary mechanism: Respiratory distress often stems from impaired gas exchange due to alveolar damage or fluid accumulation, which hinders oxygen transfer to the bloodstream and removal of carbon dioxide, leading to hypoxemia and hypercapnia.

• Secondary mechanism: Inflammatory responses, such as in Acute Respiratory Distress Syndrome (ARDS), cause increased capillary permeability, leading to pulmonary edema. This further disrupts alveolar function and exacerbates breathing difficulties.

• Key complication: If untreated, respiratory distress can rapidly progress to respiratory failure, requiring mechanical ventilation, and may result in multi-organ dysfunction due to sustained hypoxia.

Patient Profile

Demographics:

52-year-old male, construction worker

History:

• Key past medical history: Hypertension, controlled with medication; former smoker, quit 5 years ago

• Current medications: Lisinopril 10 mg daily, Aspirin 81 mg daily

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Shortness of breath, worsening over the past 48 hours

• Key symptoms: Persistent cough, wheezing, fatigue, mild chest pain on deep inhalation

• Vital signs: Temperature 99.1°F (37.3°C), Heart rate 112 bpm, Respiratory rate 26 breaths per minute, Blood pressure 145/90 mmHg, Oxygen saturation 89% on room air

Section 1

As part of the initial assessment, the healthcare team performed a thorough physical examination and collected additional diagnostic data. Upon auscultation, diminished breath sounds were noted in the lower lung fields, accompanied by bilateral crackles, suggesting possible fluid accumulation. The patient's use of accessory muscles and nasal flaring indicated increased work of breathing. An arterial blood gas (ABG) analysis revealed a pH of 7.32, PaCO2 of 50 mmHg, and PaO2 of 55 mmHg, confirming respiratory acidosis and significant hypoxemia.

A chest X-ray was ordered, revealing bilateral infiltrates consistent with pulmonary edema, raising concerns for Acute Respiratory Distress Syndrome (ARDS). Blood tests showed an elevated white blood cell count, suggesting an inflammatory or infectious process, and elevated C-reactive protein levels, further supporting a systemic inflammatory response. Despite supplemental oxygen therapy via a non-rebreather mask, his oxygen saturation remained suboptimal at 92%, indicating worsening respiratory compromise and the potential need for more aggressive interventions.

These findings necessitated timely clinical reasoning to determine the next steps. Given the risk of rapid progression to respiratory failure, the team considered initiating non-invasive positive pressure ventilation (NIPPV) to improve alveolar ventilation and gas exchange. Additionally, broad-spectrum antibiotics were started empirically to address potential underlying infections contributing to his condition. The unfolding scenario required vigilant monitoring of the patient's respiratory status and readiness to escalate care, including potential intubation and mechanical ventilation, if his condition did not stabilize.

Section 2

Despite the initiation of non-invasive positive pressure ventilation (NIPPV) and broad-spectrum antibiotics, the patient's condition continued to deteriorate over the next few hours. His respiratory rate increased to 30 breaths per minute, and he exhibited more pronounced use of accessory muscles with visible retractions. His heart rate escalated to 120 beats per minute, suggesting increased sympathetic activity due to hypoxemia or infection. Repeat arterial blood gas analysis showed a further decline in respiratory function, with a pH of 7.28, PaCO2 of 52 mmHg, and PaO2 of 50 mmHg, indicating worsening respiratory acidosis and persistent hypoxemia despite the interventions.

In light of these changes, the healthcare team performed a repeat chest X-ray, which showed increased bilateral infiltrates. This finding, coupled with the patient's declining respiratory status, suggested that the pulmonary edema and potential ARDS were progressing. A decision was made to escalate care to intubation and mechanical ventilation to ensure adequate oxygenation and ventilation. The team prepared for this intervention, considering the need for potential sedation and neuromuscular blockade to facilitate intubation and optimize ventilator settings.

As they prepared for intubation, the patient's blood pressure began to drop, with readings of 85/55 mmHg, raising concerns for sepsis-induced hypotension. This necessitated the initiation of intravenous fluid resuscitation and the consideration of vasopressor support to maintain hemodynamic stability. The healthcare team also reviewed the patient's antibiotic regimen, considering the need for culture-directed therapy once results were available. The unfolding scenario highlighted the importance of a multidisciplinary approach, continuous monitoring, and readiness to adapt the treatment plan as new complications arose, emphasizing the dynamic nature of managing a patient with acute respiratory distress.

Section 3

As the team continued to manage the patient's condition, a new complication emerged: acute kidney injury (AKI). Laboratory results revealed an elevated creatinine level of 2.1 mg/dL, up from 1.0 mg/dL earlier in the day, and an increased blood urea nitrogen (BUN) of 35 mg/dL. Urine output had noticeably decreased over the past few hours, with the patient producing less than 0.5 mL/kg/hr, indicating oliguria. This renal complication was likely multifactorial, potentially exacerbated by hypoperfusion due to hypotension and the systemic inflammatory response from sepsis.

The development of AKI prompted the healthcare team to reassess the fluid balance strategy, weighing the risks and benefits of aggressive fluid resuscitation against the potential for worsening pulmonary edema. They decided to carefully titrate fluids while closely monitoring the patient's hemodynamic status, renal function, and respiratory parameters. The nephrology team was consulted to provide additional insight into managing the patient's renal impairment, with discussions centered on the possibility of initiating renal replacement therapy if the AKI progressed further.

Despite the challenges, the multidisciplinary team remained focused on optimizing the patient's overall stability. They adjusted the ventilator settings to improve oxygenation, carefully monitored urine output, and continued to evaluate the efficacy of the antibiotic regimen. Regularly updating the care plan based on the patient's dynamic status underscored the importance of collaboration and clinical reasoning in navigating the complexities of critical illness. This vigilant approach was crucial in addressing the interplay between respiratory failure, hemodynamic instability, and renal complications, paving the way for potential recovery or further escalation of care depending on the patient's response.

Section 4

As the team continued to monitor the patient closely, a change in the patient's status became evident. The patient's respiratory rate increased to 28 breaths per minute, and oxygen saturation levels dropped to 88% despite being on 60% high-flow oxygen via a non-rebreather mask. Auscultation revealed diffuse crackles throughout both lung fields, indicating potential worsening of pulmonary edema. The patient also began exhibiting signs of increased work of breathing, including the use of accessory muscles and nasal flaring.

Simultaneously, the patient's blood pressure remained unstable, with readings fluctuating between 85/50 mmHg and 92/54 mmHg, despite cautious fluid administration. The heart rate was elevated at 110 beats per minute, and the patient appeared increasingly lethargic, responding only to verbal stimuli. Given these developments, the team re-evaluated the fluid management strategy, considering the delicate balance between maintaining adequate perfusion and exacerbating respiratory distress.

In light of these changes, an arterial blood gas analysis was performed, revealing a pH of 7.32, PaCO2 of 55 mmHg, and PaO2 of 60 mmHg, indicating respiratory acidosis and hypoxemia. The calculated bicarbonate level was 22 mEq/L. These results prompted discussions about potential intubation and mechanical ventilation to better control the patient's respiratory status and ensure adequate oxygenation. Meanwhile, nephrology suggested initiating continuous renal replacement therapy (CRRT) to address worsening kidney function and support fluid management. The team remained vigilant, ready to adapt the care plan as the patient's condition evolved, emphasizing the critical role of continuous assessment and timely intervention in managing complex, interrelated complications.

Section 5

As the team proceeded with the plan to intubate the patient, they prepared for the procedure with careful consideration of the patient's current hemodynamic instability. Pre-intubation checks were conducted to ensure everything was in place for a swift and smooth transition to mechanical ventilation. The patient's vital signs were closely monitored, revealing a concerning trend: blood pressure had further dropped to 82/48 mmHg, and heart rate spiked to 118 beats per minute. This necessitated the cautious administration of vasopressors to stabilize the patient's blood pressure during and after intubation.

Following successful intubation and initiation of mechanical ventilation, the patient's oxygenation improved, with oxygen saturation levels rising to 94% on a controlled ventilator setting. However, the team noted that the patient's urine output had significantly decreased over the past four hours, with only 10 mL produced, signaling potential acute kidney injury. Laboratory results confirmed a rising creatinine level to 2.1 mg/dL and an elevated blood urea nitrogen (BUN) level of 45 mg/dL, further indicating renal impairment.

In conjunction with nephrology, the team initiated continuous renal replacement therapy (CRRT) to support renal function and assist in managing fluid overload. Over the next several hours, the patient's hemodynamics showed slight improvement, with blood pressure stabilizing at 90/52 mmHg with the help of vasopressors. The critical care team remained vigilant, aware of the potential for new complications, such as electrolyte imbalances or further hemodynamic instability, which would require ongoing assessment and timely interventions. The focus remained on closely monitoring the patient's response to these therapies and adjusting the treatment plan as necessary to address any emerging challenges.