Bowel Obstruction - Nursing Case Study

Pathophysiology

• Primary mechanism: Bowel obstruction occurs when there is a blockage in the intestines, preventing the normal movement of digestive contents. This can be due to mechanical causes like tumors, adhesions, or hernias, leading to increased intraluminal pressure and compromised blood flow.

• Secondary mechanism: The blockage causes accumulation of fluid and gas proximal to the obstruction, resulting in bowel distension. This distension further impairs blood supply to the intestinal wall, increasing the risk of ischemia and necrosis.

• Key complication: If untreated, bowel obstruction can lead to bowel perforation and peritonitis, causing severe inflammation and infection of the abdominal cavity, which may progress to sepsis, a life-threatening condition requiring immediate medical intervention.

Patient Profile

Demographics:

45-year-old male, construction worker

History:

• Key past medical history: Previous episodes of diverticulitis, appendectomy at age 30

• Current medications: Lisinopril 10 mg daily, Omeprazole 20 mg daily

• Allergies: Penicillin (rash)

Current Presentation:

• Chief complaint: Abdominal pain and vomiting

• Key symptoms: Cramping abdominal pain, bloating, nausea, inability to pass stool or gas, reduced appetite

• Vital signs: Temperature 38.2°C (100.8°F), Heart rate 112 bpm, Blood pressure 98/60 mmHg, Respiratory rate 24 breaths per minute, Oxygen saturation 94% on room air

Section 1

As the medical team continues to monitor the patient, a significant change in his status becomes apparent. The patient's abdominal pain has intensified, now described as sharp and localized in the right lower quadrant. His abdomen is markedly distended and tender to palpation, with guarding and rebound tenderness, suggesting peritoneal irritation. Vital signs indicate worsening instability: heart rate has increased to 126 bpm, blood pressure has dropped further to 88/54 mmHg, and respiratory rate has escalated to 28 breaths per minute. Oxygen saturation remains at 92% on room air, despite supplemental oxygen administration. These findings are concerning for potential bowel perforation and the onset of peritonitis.

In response to these alarming symptoms, an urgent abdominal CT scan is ordered. The imaging reveals a significant transition point in the ileum with proximal bowel dilation, consistent with a mechanical obstruction. Additionally, there is free air under the diaphragm, indicating bowel perforation, and fluid accumulation in the abdominal cavity suggestive of early peritoneal fluid accumulation. Laboratory results show an elevated white blood cell count of 18,000 cells/mm³, with a left shift, further supporting the suspicion of an acute inflammatory process. The patient's lactate level is elevated at 3.5 mmol/L, pointing towards tissue hypoperfusion and potential ischemia.

These findings necessitate immediate surgical intervention to address the bowel obstruction and repair the perforation. The clinical team prepares the patient for an emergency laparotomy, initiating broad-spectrum antibiotics to target potential peritoneal infection and providing aggressive fluid resuscitation to stabilize hemodynamics. The situation underscores the importance of timely recognition and management of complications in bowel obstruction to prevent progression to sepsis and other life-threatening conditions. As the surgical team prepares, the need for coordination and swift action is critical to improve the patient's chances for recovery.

Section 2

As the surgical team initiates the laparotomy, they discover that the obstruction in the ileum is due to a fibrous band constricting the bowel, which has caused a perforation in the intestinal wall. The perforation has led to spillage of intestinal contents into the peritoneal cavity, confirming the onset of peritonitis. The surgical team quickly removes the obstructing band and repairs the perforation. During the procedure, they also note the presence of necrotic tissue surrounding the perforation site, indicative of bowel ischemia due to compromised blood flow.

Post-operatively, the patient is transferred to the intensive care unit for close monitoring. Despite the surgical intervention, the patient remains in a fragile state. His vital signs show a persistent tachycardia with a heart rate of 118 bpm, and hypotension with blood pressure at 92/58 mmHg, despite aggressive fluid resuscitation. His respiratory rate is slightly improved at 24 breaths per minute, and oxygen saturation has increased to 94% with supplemental oxygen. The nursing team continues to monitor his urine output, which is low at 15 mL/hr, suggesting ongoing renal hypoperfusion and potential acute kidney injury.

The clinical team recognizes that the patient is at high risk for sepsis due to the bowel perforation and necrosis. The elevated lactate level and low urine output indicate that tissue perfusion is still compromised. The team adjusts the treatment plan by optimizing antibiotic therapy and considering the need for vasopressors to maintain adequate blood pressure. Discussions with the multidisciplinary team focus on balancing fluid management to prevent fluid overload while ensuring adequate perfusion. As the patient’s condition is reassessed, the team remains vigilant for signs of further complications, such as worsening sepsis or multi-organ dysfunction, which could significantly impact the patient's recovery trajectory.

Section 3

As the hours pass post-operatively, the patient's condition evolves, presenting new diagnostic results that provide further insights into his precarious state. Blood cultures drawn upon admission to the ICU reveal the presence of Escherichia coli, confirming a bloodstream infection secondary to the bowel perforation. The white blood cell count remains elevated at 18,000/mm³, consistent with the ongoing inflammatory response. Additionally, his C-reactive protein (CRP) level is markedly high, underscoring the severity of the systemic inflammatory process. The lactate level, although slightly decreased, is still elevated at 3.8 mmol/L, indicating persistent tissue hypoperfusion.

The patient's kidney function is closely monitored, and laboratory tests reveal a rise in creatinine to 2.1 mg/dL, confirming the suspicion of acute kidney injury. In response to these findings, the clinical team intensifies antibiotic therapy to target the identified pathogen, adjusting the regimen to include broad-spectrum coverage. The decision to initiate low-dose norepinephrine is made to support blood pressure and improve renal perfusion, as the patient's hypotension remains resistant to fluid therapy alone.

With these new diagnostic insights, the multidisciplinary team convenes to reassess the patient's treatment strategy, balancing the need for aggressive management of the infection and circulatory support against the risk of fluid overload and further organ dysfunction. The nursing team plays a critical role in monitoring the patient's response to these interventions, closely tracking vital signs, urine output, and mental status. As the team remains vigilant for signs of improvement or deterioration, the focus shifts to stabilizing the patient's condition and preventing the progression to critical complications such as septic shock or multiple organ failure.

Section 4

As the clinical team continues to monitor the patient's response to the intensified treatment regimen, a significant change in the patient's status becomes apparent. Approximately 12 hours post-initiation of norepinephrine, the patient's blood pressure stabilizes at 105/65 mmHg, and urine output modestly improves to 0.6 mL/kg/hr. Despite these encouraging signs, the patient's mental status becomes a growing concern. He is increasingly difficult to arouse, verbal responses are delayed, and he exhibits a Glasgow Coma Scale (GCS) score reduction to 12 from an initial 14. This alteration raises suspicions of potential central nervous system involvement or worsening metabolic derangement.

Laboratory results reveal a further increase in creatinine levels to 2.5 mg/dL, indicating a progression of acute kidney injury. Additionally, arterial blood gas analysis shows a mild metabolic acidosis with a pH of 7.32 and a bicarbonate level of 18 mEq/L, suggesting an ongoing struggle with tissue oxygenation and perfusion. The elevated lactate level, though slightly decreased, signals persistent tissue stress. Despite broad-spectrum antibiotics, the patient's inflammatory markers, including CRP, remain elevated, indicating an ongoing systemic inflammatory response.

In light of these developments, the multidisciplinary team reconvenes to consider potential adjustments to the treatment plan. The possibility of dialysis is discussed to manage uremia and fluid overload. The team also contemplates the need for neurological consultation to explore the causes of the altered mental status. As the patient's journey unfolds, the nursing team remains vigilant, providing frequent assessments and communicating subtle changes in the patient's condition to the medical team, ensuring timely interventions and adaptations to the care plan. The focus is now on preventing further deterioration and addressing the complex interplay of organ dysfunctions.

Section 5

As the nursing team conducts an initial assessment following the multidisciplinary meeting, they note several key changes in the patient's status. The patient's skin is now cool and clammy, and there is a notable increase in respiratory rate to 28 breaths per minute, indicating potential respiratory compensation for the metabolic acidosis. Heart rate remains elevated at 115 beats per minute, and the patient's blood pressure has slightly decreased again to 98/60 mmHg, suggesting ongoing hemodynamic instability despite norepinephrine support. The nursing team also observes decreased bowel sounds, which raises concerns about worsening bowel obstruction or ischemia, necessitating further abdominal evaluation.

New diagnostic results arrive, revealing an increase in white blood cell count to 18,500/µL, pointing towards an exacerbation of the inflammatory response, possibly due to sepsis or bowel ischemia. A CT scan of the abdomen is ordered and shows significant distension of the bowel loops with signs of bowel wall thickening, suggestive of ischemic changes. These findings correlate with the patient's deteriorating clinical picture and prompt the surgical team to consider the necessity of urgent exploratory laparotomy to address potential bowel compromise.

Given these developments, the focus shifts towards stabilizing the patient while preparing for possible surgical intervention. The team intensifies fluid resuscitation and adjusts the vasopressor regimen to optimize perfusion. A nephrology consult is requested to evaluate the need for renal replacement therapy, considering the worsening acute kidney injury. The nursing team continues to monitor vital signs closely, documenting changes in mental status and ensuring that all observations are promptly communicated to the medical team. This coordinated approach aims to halt the progression of multi-organ dysfunction and to guide the patient safely through this critical phase of his illness.