Septic Shock - Nursing Case Study
Pathophysiology
• Primary mechanism: In septic shock, a severe infection triggers an overwhelming systemic inflammatory response, releasing pro-inflammatory cytokines. This causes widespread vasodilation, leading to a significant drop in blood pressure (hypotension) and impaired tissue perfusion.
• Secondary mechanism: The inflammatory response also causes increased vascular permeability, allowing fluid to leak from the bloodstream into tissues. This exacerbates hypotension and can lead to edema, reducing the effective circulating blood volume and further impairing oxygen delivery to organs.
• Key complication: These processes can result in multiple organ dysfunction syndrome (MODS) due to insufficient oxygen and nutrient supply, causing progressive organ failure if not promptly addressed. Early recognition and intervention are critical to improving patient outcomes.
Patient Profile
Demographics:
62-year-old female, retired school teacher
History:
• Key past medical history: Hypertension, Type 2 Diabetes, Chronic Kidney Disease Stage 3
• Current medications: Lisinopril, Metformin, Amlodipine
• Allergies: Penicillin
Current Presentation:
• Chief complaint: Severe abdominal pain and confusion
• Key symptoms: Fever, chills, difficulty breathing, decreased urine output, and lethargy
• Vital signs: Temperature 102.4°F, Heart rate 112 bpm, Blood pressure 88/56 mmHg, Respiratory rate 28 breaths per minute, Oxygen saturation 91% on room air
Section 1
The initial assessment reveals that the patient is in significant distress. On physical examination, the patient exhibits cold, clammy skin and mottling on her extremities, indicating poor peripheral perfusion. Auscultation of the lungs reveals bilateral crackles, suggesting pulmonary edema, likely secondary to fluid overload and increased vascular permeability. Her abdomen is distended and tender upon palpation, especially in the lower quadrants, raising suspicion for an intra-abdominal source of infection, such as diverticulitis or a perforated bowel.
Laboratory results return with concerning findings. The complete blood count shows leukocytosis with a left shift, indicating an acute bacterial infection. Her lactate level is elevated at 4.5 mmol/L, signifying tissue hypoperfusion and hypoxia. Renal function tests reveal worsening kidney function, with a serum creatinine level of 2.8 mg/dL and blood urea nitrogen of 45 mg/dL, indicating acute kidney injury on top of her chronic kidney disease. Blood cultures are drawn, and broad-spectrum antibiotics are initiated, mindful of her penicillin allergy.
Despite initial fluid resuscitation with crystalloid solutions, the patient's blood pressure remains critically low, and her mental status deteriorates further, with increasing confusion and reduced responsiveness. The healthcare team decides to initiate vasopressor therapy with norepinephrine to stabilize her hemodynamics, while considering the need for further diagnostic imaging, such as an abdominal CT scan, to identify the source of infection. The team also contemplates the need for potential surgical intervention depending on the underlying cause. These developments underscore the urgency of addressing the source of infection and optimizing organ support to prevent the progression to multiple organ dysfunction syndrome.
Section 2
As the medical team continues to manage the patient's condition, they proceed with an abdominal CT scan to identify the potential source of infection. The imaging reveals a perforated diverticulum in the sigmoid colon, confirming a diagnosis of perforated diverticulitis. This finding explains the patient's abdominal tenderness and distension. The surgical team is consulted urgently, and a decision is made to take the patient to the operating room for an exploratory laparotomy and possible bowel resection to address the source of infection.
Meanwhile, the patient's condition remains precarious. Despite the initiation of norepinephrine, her blood pressure is only marginally improved, with readings fluctuating around 85/50 mmHg. Her heart rate remains tachycardic at 120 beats per minute, and her respiratory rate is elevated at 30 breaths per minute. Oxygen saturation is 90% on high-flow nasal cannula, indicating ongoing respiratory compromise likely due to pulmonary edema. The nursing team closely monitors her urine output, which has decreased to less than 20 mL per hour, suggesting worsening renal perfusion and acute kidney injury.
The patient's clinical status demands meticulous coordination of care. The healthcare team intensifies their efforts to optimize hemodynamic support and organ function in preparation for surgery. They consider the addition of a second vasopressor, such as vasopressin, to further support her blood pressure. The team also discusses the potential need for renal replacement therapy postoperatively if her kidney function continues to decline. These steps underscore the importance of timely surgical intervention, as well as the need for ongoing assessment and adjustment of the patient's treatment plan to stabilize her condition and prevent further complications.
Section 3
As the patient is prepped for surgery, the medical team receives new lab results, which reveal a significant drop in hemoglobin levels to 7.5 g/dL, indicating acute blood loss likely exacerbated by the perforated diverticulum. This finding adds complexity to the patient's condition, necessitating an immediate blood transfusion to stabilize her hemoglobin levels before proceeding to surgery. The team orders two units of packed red blood cells, understanding that maintaining adequate oxygen-carrying capacity is crucial given her compromised respiratory status and low oxygen saturation.
In addition to addressing the anemia, the patient's worsening metabolic acidosis, with an arterial blood gas showing a pH of 7.28 and a bicarbonate level of 15 mEq/L, suggests a need for aggressive management of her acid-base balance. The combination of poor tissue perfusion, reduced kidney function, and ongoing infection contributes to the acidotic state, highlighting the importance of correcting electrolyte imbalances and optimizing volume status. The team administers a sodium bicarbonate infusion to mitigate the severe acidosis while continuing fluid resuscitation with balanced crystalloids to improve her hemodynamic profile.
These developments prompt the nursing team to intensify their monitoring efforts, paying close attention to the patient's hemodynamic and respiratory parameters. They ensure that all interventions, including the transfusion and bicarbonate therapy, are effectively coordinated with the surgical team, emphasizing the need for a seamless transition to the operating room. The patient's ability to respond to these interventions will be critical in determining her stability for surgery and potential recovery trajectory, underscoring the delicate balance required in managing her complex clinical situation.
Section 4
As the team continues to monitor the patient's response to the initial interventions, new complications arise that require immediate attention. Despite the transfusion of two units of packed red blood cells, the patient's hemoglobin level only slightly increases to 8.2 g/dL, and her oxygen saturation remains precariously low at 88%. This suggests that the transfusion alone may not be sufficient to address the underlying issues contributing to her anemia and hypoxia. The patient's heart rate increases to 120 beats per minute, and her blood pressure remains unstable, fluctuating between 85/55 mmHg and 92/60 mmHg, indicating persistent hemodynamic instability.
Further diagnostic testing reveals elevated lactate levels at 5.5 mmol/L, confirming ongoing tissue hypoperfusion and anaerobic metabolism, which complicates her metabolic acidosis. The patient's kidney function continues to decline, with her creatinine rising to 2.4 mg/dL and urine output decreasing significantly to less than 20 mL/hr, suggestive of acute kidney injury. The team recognizes that these developments may indicate worsening septic shock, compounded by potential multi-organ dysfunction.
In response, the medical team intensifies their management strategy, increasing the rate of balanced crystalloids and initiating a low-dose norepinephrine infusion to support her blood pressure and improve perfusion. Concurrently, they consult with the surgical team to prioritize the timing of the operative intervention, weighing the risks of further delay against the need for additional stabilization. The nursing team remains vigilant, closely monitoring for any signs of clinical deterioration and ensuring all measures are in place for a rapid transfer to the operating room once the patient's status allows. The focus is on stabilizing her condition to maximize her chances of a successful surgical outcome and recovery.
Section 5
The response to the intensified management strategy initially appears promising; however, new complications soon emerge. The patient's oxygen saturation remains critically low despite increased supplemental oxygen and the addition of norepinephrine to stabilize her blood pressure. Her respiratory rate increases to 32 breaths per minute, indicating respiratory distress. Arterial blood gas analysis reveals a pH of 7.25, PaCO2 of 55 mmHg, and HCO3- of 19 mEq/L, consistent with mixed respiratory and metabolic acidosis. These findings suggest that her respiratory system is struggling to compensate for the metabolic derangements, necessitating further interventions.
In addition to respiratory concerns, the patient's neurological status begins to deteriorate. She becomes increasingly lethargic and only responsive to painful stimuli, with a Glasgow Coma Scale score dropping to 8. This change in mental status raises alarms about potential cerebral hypoperfusion and worsening sepsis-related encephalopathy. Laboratory results also show persistently elevated inflammatory markers, with a white blood cell count of 18,000/mm³ and a C-reactive protein level of 200 mg/L, indicating an ongoing severe inflammatory response.
The team quickly identifies the need for aggressive respiratory support and neurologic assessment. They initiate non-invasive positive pressure ventilation to improve oxygenation and reduce the work of breathing. Simultaneously, they expedite plans for a CT scan of the head to rule out any acute intracranial processes that might be contributing to her altered mental status. As they work to stabilize her condition, the team remains acutely aware of the delicate balance required to manage her complex presentation, understanding that each intervention must be carefully timed to prevent further decompensation while preparing for potential surgical intervention.