Late Onset Sepsis - Nursing Case Study

Pathophysiology

• Primary mechanism: Late Onset Sepsis (LOS) is primarily driven by bacterial invasion, often from the environment or through medical devices, leading to systemic infection in neonates. Immature immune systems struggle to contain these pathogens, resulting in widespread infection.

• Secondary mechanism: The bacteria release endotoxins or exotoxins, triggering an exaggerated inflammatory response. This response can damage blood vessels and organs due to the overproduction of pro-inflammatory cytokines, leading to systemic inflammation.

• Key complication: This systemic inflammation can cause multi-organ dysfunction, including respiratory distress and cardiovascular instability, which are critical concerns in the management of LOS in neonates.

Patient Profile

Demographics:

72-year-old female, retired school teacher

History:

• Key past medical history: Type 2 Diabetes, Hypertension, Chronic Kidney Disease Stage 3

• Current medications: Metformin, Lisinopril, Atorvastatin

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Fever and confusion

• Key symptoms: Increased fatigue, shortness of breath, decreased urine output, mild abdominal pain

• Vital signs: Temperature 38.7°C, Heart Rate 112 beats per minute, Respiratory Rate 24 breaths per minute, Blood Pressure 90/58 mmHg, Oxygen Saturation 92% on room air

Section 1

New Diagnostic Results:

The healthcare team, concerned about the 72-year-old patient's deteriorating condition, promptly initiated a series of diagnostic tests to pinpoint the underlying cause of her symptoms. Blood cultures were drawn, revealing the presence of Escherichia coli, a common culprit in late onset sepsis, particularly in individuals with underlying chronic conditions. A complete blood count showed leukocytosis with a left shift, indicating a robust immune response to the bacterial invasion. Additionally, a comprehensive metabolic panel revealed worsening renal function with an elevated creatinine level of 2.5 mg/dL, consistent with her chronic kidney disease but now exacerbated by sepsis. Liver function tests showed a slight elevation in transaminases, suggesting early hepatic involvement.

A chest X-ray was performed due to her respiratory symptoms and revealed bilateral infiltrates, raising concerns for possible pneumonia as a complication of her sepsis. An abdominal ultrasound was also conducted given her mild abdominal pain, which showed no acute abdominal pathology but did highlight mild hydronephrosis, likely due to her decreased urine output and systemic inflammatory response. The arterial blood gas analysis indicated a metabolic acidosis with a pH of 7.32 and bicarbonate level of 18 mEq/L, further complicating her clinical picture and suggesting increased tissue hypoxia.

These diagnostic results provide critical insights into the severity and progression of the patient's condition, highlighting the need for a targeted treatment approach. The positive blood culture for E. coli necessitates the initiation of appropriate antibiotic therapy, taking into consideration her penicillin allergy. The imaging findings and lab results underscore the systemic impact of the infection, prompting the healthcare team to closely monitor her respiratory and renal function, as well as to consider potential adjustments to her current medication regimen to mitigate further organ dysfunction.

Section 2

Change in Patient Status:

As the medical team began administering broad-spectrum antibiotics tailored to her known history of penicillin allergy, the patient's status was closely monitored for any changes. Over the next 24 hours, her clinical picture evolved with both concerning and promising developments. Her vital signs revealed a persistent low-grade fever of 100.8°F, a heart rate that remained elevated at 110 beats per minute, and a blood pressure that fluctuated between 95/60 mmHg and 105/65 mmHg, suggesting ongoing hemodynamic instability. Despite these vital signs, her respiratory rate, which had been previously increased, showed slight improvement, stabilizing around 20 breaths per minute with supplemental oxygen maintaining her SpO2 at 94%.

The patient's urine output remained low, with an output of only 300 mL over the past 12 hours, reinforcing the concern over her renal status. Repeat laboratory tests showed a rise in creatinine to 2.8 mg/dL, indicating a worsening of her acute kidney injury from the sepsis. However, the white blood cell count showed a slight decrease to 18,000/mm³, suggesting a potential initial response to antibiotic therapy. Despite this, the patient's metabolic acidosis persisted, with a pH of 7.30 and bicarbonate level of 17 mEq/L, highlighting ongoing tissue perfusion issues and the need for continued metabolic monitoring.

The team decided to escalate supportive care measures, including the cautious initiation of intravenous fluids to address hypoperfusion while being mindful of her renal function. Additionally, they consulted nephrology to consider potential renal support therapies if her creatinine continued to rise. With these changes, the healthcare team remained vigilant for further complications, such as septic shock or multi-organ dysfunction, and prepared to adjust the treatment plan as necessary based on her evolving condition. This delicate balance of interventions and monitoring set the stage for the next phase of her management, emphasizing the importance of timely adjustments to prevent further deterioration.

Section 3

As the medical team continued to monitor the patient closely, new diagnostic results provided further insight into her condition. A repeat blood culture returned positive for a gram-negative bacillus, suggesting that the infection was likely of gastrointestinal origin. The sensitivity profile indicated susceptibility to the current antibiotic regimen, providing reassurance that the chosen therapy was appropriate. However, the persistence of the low-grade fever and elevated heart rate raised concerns about potential complications or inadequate source control.

Further imaging studies, including an abdominal ultrasound, revealed mild ascites and signs of possible early intra-abdominal abscess formation. This prompted the team to consult with surgery to evaluate the need for further intervention, such as drainage or exploratory procedures. The assessment highlighted the importance of addressing potential sources of infection to prevent further septic progression.

Despite these challenges, there were some positive trends in the patient's clinical status. Her white blood cell count continued to decrease, now at 15,000/mm³, and her creatinine level showed a slight improvement to 2.5 mg/dL following cautious fluid resuscitation. These changes suggested a partial response to treatment, although the ongoing metabolic acidosis and fluctuating hemodynamic parameters indicated that she remained at risk for further complications. The team recognized the need for continued vigilance and timely adjustments in her care, focusing on both optimizing her current therapy and exploring additional diagnostic and therapeutic avenues to address the underlying infection effectively.

Section 4

As the medical team continued to monitor the patient, they noted a change in her status that warranted immediate attention. Over the course of several hours, her respiratory rate increased to 28 breaths per minute, and her oxygen saturation began to drop, fluctuating between 88% and 90% on room air. The patient also reported increasing abdominal discomfort and exhibited signs of restlessness and mild confusion, raising concerns about her overall oxygenation and perfusion. A quick bedside assessment revealed diminished breath sounds at the lung bases, coupled with the use of accessory muscles, suggesting the potential development of respiratory compromise due to either fluid overload or worsening infection.

Given these changes, the team decided to initiate supplemental oxygen therapy and conducted a repeat arterial blood gas analysis. The results showed a pH of 7.30, PaCO2 of 50 mmHg, and HCO3- of 20 mEq/L, indicating a mixed respiratory and metabolic acidosis. These findings pointed towards the need for more aggressive management of her respiratory status and a possible reevaluation of her fluid balance. The clinical team considered the possibility of evolving acute respiratory distress syndrome (ARDS) secondary to sepsis, which would necessitate close monitoring and potentially more advanced respiratory support measures.

In light of these developments, the team coordinated with the ICU and pulmonology specialists to discuss the need for potential transfer to a higher level of care and further interventions. They also revisited her fluid management strategy, balancing the need for adequate resuscitation with the risk of exacerbating respiratory distress. These steps were crucial in ensuring the patient’s stability and preventing further deterioration, highlighting the importance of an integrated, multidisciplinary approach in managing complex septic cases.

Section 5

As the patient was closely monitored after the initiation of supplemental oxygen therapy, her condition continued to evolve. Despite efforts to stabilize her respiratory status, her oxygen saturation remained labile, requiring a gradual increase in oxygen delivery. She was eventually placed on a high-flow nasal cannula, which helped maintain her oxygen saturation in the low 90s. However, her respiratory rate remained elevated at 30 breaths per minute, and her use of accessory muscles persisted, indicating ongoing respiratory distress.

Concurrent with these respiratory concerns, the patient's abdominal discomfort intensified, and she exhibited increased abdominal distention and tenderness upon palpation. A repeat abdominal ultrasound was ordered to investigate potential causes, revealing evidence of fluid accumulation consistent with ascites. Laboratory tests showed a rising lactate level of 4.5 mmol/L and a leukocyte count of 18,000/mm³ with a left shift, suggesting a worsening inflammatory response. These findings raised suspicions of possible intra-abdominal sepsis or an evolving complication such as bowel ischemia, necessitating further diagnostic exploration and possible surgical consultation.

Given the patient's complex and deteriorating condition, the clinical team faced a critical need to reassess her treatment plan. The decision was made to escalate her care to the intensive care unit for continuous monitoring and to facilitate potential interventions, including advanced respiratory support and further imaging studies. The team also considered the initiation of broad-spectrum antibiotics with coverage for potential intra-abdominal pathogens, pending culture results. This situation underscored the dynamic nature of late-onset sepsis and the necessity for vigilant assessment, timely interventions, and interdisciplinary collaboration to navigate potential complications effectively.