Pneumonia - Nursing Case Study

Pathophysiology

• Primary mechanism: Inhalation or hematogenous spread of pathogens (bacteria, viruses, fungi) leads to infection in the alveoli, causing an inflammatory response. This results in the accumulation of fluid, white blood cells, and cellular debris, impairing gas exchange and causing typical symptoms like cough and dyspnea.

• Secondary mechanism: The inflammatory mediators increase alveolar-capillary membrane permeability, allowing fluid and proteins to leak into the alveoli, further compromising oxygenation and potentially leading to hypoxemia.

• Key complication: If untreated, the inflammatory process can lead to consolidation of lung tissue, reduced lung compliance, and severe respiratory distress, increasing the risk of systemic infection (sepsis) and respiratory failure.

Patient Profile

Demographics:

45-year-old female, school teacher

History:

• Key past medical history: Asthma, Hypertension

• Current medications: Inhaler (Albuterol), Lisinopril

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Shortness of breath and persistent cough

• Key symptoms: Fever, productive cough with greenish sputum, chest pain, fatigue

• Vital signs: Temperature 101.3°F, Heart rate 110 bpm, Respiratory rate 28 breaths/min, Blood pressure 140/88 mmHg, Oxygen saturation 89% on room air

Section 1

New Diagnostic Results:

As the medical team initiates further investigations to confirm the diagnosis of pneumonia and assess the severity, a chest X-ray is ordered. The X-ray reveals significant consolidation in the right lower lobe, consistent with bacterial pneumonia. A complete blood count (CBC) is performed, showing a white blood cell count of 15,000/mm³ with a left shift, indicating an active bacterial infection. Additionally, a sputum culture is taken to identify the causative organism, which later grows Streptococcus pneumoniae, confirming the bacterial nature of the infection.

In light of the patient's penicillin allergy, the healthcare team decides to initiate treatment with a macrolide antibiotic, Azithromycin, as it offers coverage against Streptococcus pneumoniae and is generally well-tolerated. The decision is made considering her asthma and the need to avoid potential allergens that could exacerbate her respiratory condition. Alongside antibiotic therapy, supplemental oxygen is administered to improve her oxygen saturation, and her response to these interventions is closely monitored.

This diagnostic information and treatment plan set the stage for evaluating the patient's response to the antibiotic therapy. Clinicians will be vigilant for any signs of clinical improvement or potential complications, such as worsening respiratory distress or the development of sepsis. The medical team remains cautious, given her underlying asthma, which could complicate her recovery from pneumonia. The focus now shifts to monitoring her vital signs, respiratory status, and potential changes in clinical condition as she progresses through treatment.

Section 2

As treatment progresses, the healthcare team notes a change in the patient's status on the third day of hospitalization. Although initially responding well to Azithromycin and supplemental oxygen, the patient begins to exhibit signs of increasing respiratory distress. Her respiratory rate rises to 28 breaths per minute, and her oxygen saturation drops to 88% on room air, necessitating an increase in oxygen support. Auscultation reveals decreased breath sounds in the right lower lung field, with audible wheezing, suggesting a possible exacerbation of her asthma alongside the pneumonia. The patient also reports increased fatigue and mild confusion, signaling potential hypoxia.

In response to these changes, the medical team orders an arterial blood gas (ABG) analysis, which reveals a pH of 7.32, PaCO2 of 50 mmHg, and PaO2 of 60 mmHg, indicating respiratory acidosis with hypoxemia. This finding raises concern for impending respiratory failure, prompting the need for closer monitoring and consideration of additional interventions. A repeat chest X-ray is also performed, showing no significant improvement in the right lower lobe consolidation, and new bilateral infiltrates are noted, suggesting possible progression of the infection or the development of a secondary complication such as acute respiratory distress syndrome (ARDS).

Given these developments, the healthcare team engages in clinical reasoning to adjust the treatment plan. They consider the need for more aggressive respiratory support, such as non-invasive ventilation, to address the hypoxemia and reduce the work of breathing. Additionally, the patient's asthma management is reviewed, and a bronchodilator regimen is intensified to alleviate bronchospasm. The team also contemplates a broader spectrum antibiotic coverage due to the possibility of a secondary infection or resistant strain. Through careful monitoring and timely interventions, the team aims to stabilize the patient's respiratory status and prevent further deterioration.

Section 3

As the patient continues to receive treatment, her respiratory status remains a significant concern. On the fourth day of hospitalization, despite the implementation of non-invasive ventilation and intensified bronchodilator therapy, her respiratory distress persists. Her respiratory rate remains elevated at 30 breaths per minute, and her oxygen saturation fluctuates between 86% to 90% even with increased oxygen support. During rounds, the medical team notes that the patient is more lethargic, and her confusion has worsened, prompting a re-evaluation of her neurological status. Neurological assessment reveals sluggish pupillary responses and a Glasgow Coma Scale (GCS) score of 13, indicating moderate impairment.

Concurrent with these observations, the patient's laboratory results return, showing an elevated white blood cell count of 15,000/mm³ with a left shift, suggesting ongoing infection or inflammation. C-reactive protein levels are also markedly elevated, further indicating systemic inflammatory response. The team orders a repeat ABG analysis, which shows persistent respiratory acidosis with a pH of 7.30, PaCO2 of 52 mmHg, and PaO2 of 58 mmHg, confirming the need for further escalation in respiratory support and the possibility of mechanical ventilation if the patient's condition does not improve.

Considering the potential for a secondary infection or ARDS, the medical team decides to broaden the antibiotic coverage to include a combination of a beta-lactam and a fluoroquinolone, aiming to cover atypical pathogens and resistant strains. They also initiate corticosteroid therapy to manage inflammation associated with both the pneumonia and the possible ARDS, hoping to reduce pulmonary inflammation and improve oxygenation. Given the patient's deteriorating neurological status and respiratory parameters, the team arranges for closer monitoring in a step-down unit, where her vital signs and response to the adjusted treatment plan can be more rigorously observed. Through these interventions, they aim to stabilize her condition and prevent further complications, setting the stage for the next critical phase of her care.

Section 4

As the patient is transferred to the step-down unit, her status continues to be closely monitored. On the fifth day of hospitalization, a change in her condition is noted during the early morning assessment. The patient's respiratory rate has increased to 36 breaths per minute, and her oxygen saturation has further decreased, now fluctuating between 82% and 85% despite being on high-flow oxygen. Her heart rate has risen to 115 beats per minute, and blood pressure is recorded at 95/60 mmHg, indicating possible hemodynamic instability. The nursing team also observes that the patient's skin is cool and clammy, and her previously noted confusion has progressed to a GCS score of 11, signifying a decline in her neurological function.

The medical team responds swiftly to these developments, suspecting the onset of Acute Respiratory Distress Syndrome (ARDS) and potential septic shock, given the signs of systemic deterioration and hemodynamic compromise. They order a series of urgent diagnostics, including a chest X-ray, which reveals bilateral infiltrates consistent with ARDS, while a repeat set of blood cultures is obtained to rule out any new or resistant infections. An echocardiogram is also considered to assess cardiac function, as part of a broader evaluation for possible cardiogenic contributions to her symptoms.

In response to the evolving situation, the decision is made to initiate mechanical ventilation to manage her severe hypoxemia and respiratory acidosis more effectively. Vasopressor support is started to stabilize her blood pressure, alongside aggressive fluid resuscitation tailored to her clinical response. The healthcare team re-evaluates the antibiotic regimen, ensuring it remains comprehensive against potential pathogens. This phase of her care demands vigilant monitoring and precise adjustments to her treatment plan, as they strive to reverse the complications and stabilize her systemic and respiratory status. These interventions set the stage for a critical period of intensive care, highlighting the importance of integrated clinical reasoning to navigate the complexities of her condition.

Section 5

As the medical team continues to manage the patient's condition, the new diagnostic results provide critical insights into her evolving status. The repeat blood cultures return positive for a multidrug-resistant strain of Pseudomonas aeruginosa, necessitating a revision of her antibiotic regimen to include a combination of ceftolozane-tazobactam and amikacin, tailored to the sensitivity profile of the pathogen. The echocardiogram reveals a normal ejection fraction, ruling out significant cardiogenic factors contributing to her respiratory distress, thus confirming the primary diagnosis of ARDS secondary to pneumonia and sepsis.

In response to these findings, the healthcare team maintains a high level of vigilance. The patient's mechanical ventilation settings are adjusted to optimize oxygenation while minimizing ventilator-induced lung injury, emphasizing low tidal volume and appropriate PEEP settings. Despite these efforts, her arterial blood gas analysis shows persistent respiratory acidosis with a pH of 7.28 and PaCO2 of 55 mmHg, underscoring the ongoing challenge of achieving adequate gas exchange. Meanwhile, her vasopressor requirements have stabilized, with norepinephrine supporting her blood pressure at 105/65 mmHg, suggesting a partial response to fluid resuscitation and vasopressor therapy.

As the patient's journey continues, the focus shifts to monitoring for any new complications, such as acute kidney injury or further neurological decline, which could complicate her recovery. The nursing team diligently conducts frequent assessments, noting any changes in urine output, electrolyte imbalances, or shifts in her neurological status. They remain proactive in adapting the care plan, coordinating with the multidisciplinary team to address any emerging issues promptly. This phase of care highlights the importance of ongoing clinical reasoning and adaptability, as the team works to navigate the complexities of managing a critically ill patient with pneumonia, ARDS, and sepsis.