Lower GI bleeding - Nursing Case Study

Pathophysiology

• Primary mechanism: Diverticulosis - Small pouches (diverticula) form in the colon wall, which can erode nearby vessels, leading to bleeding when these vessels rupture, typically presenting as painless hematochezia (red blood per rectum).

• Secondary mechanism: Inflammatory Bowel Disease (IBD) - Conditions like ulcerative colitis and Crohn's disease cause chronic inflammation and ulceration of the intestinal wall, which can result in bleeding due to mucosal erosion and friability, often accompanied by abdominal pain and diarrhea.

• Key complication: Hemodynamic instability - Significant blood loss from lower GI bleeding can lead to hypovolemic shock, characterized by low blood pressure, increased heart rate, and poor perfusion, necessitating prompt fluid resuscitation and possibly blood transfusions to stabilize the patient.

Patient Profile

Demographics:

45-year-old male, construction worker

History:

• Key past medical history: Hypertension, diverticulosis

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

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Rectal bleeding

• Key symptoms: Dark, tarry stools for the past 3 days, fatigue, dizziness

• Vital signs: Blood pressure 90/60 mmHg, heart rate 110 bpm, respiratory rate 20 breaths per minute, temperature 98.6°F, oxygen saturation 95% on room air

Section 1

After the initial assessment, the medical team proceeded with a focused diagnostic workup to determine the source and severity of the bleeding. A complete blood count (CBC) revealed a hemoglobin level of 7.5 g/dL, indicating significant anemia secondary to blood loss. Given his low blood pressure and tachycardia, this finding confirmed the suspicion of hypovolemic shock. A colonoscopy was performed and identified active bleeding from a diverticulum in the sigmoid colon. There was also evidence of inflamed mucosa, raising concerns about a possible underlying inflammatory bowel condition, which might be exacerbating the bleeding risk.

In response to these findings, the patient was started on intravenous fluids to address his hemodynamic instability. Blood transfusions were initiated to increase his hemoglobin to a safer level. Despite these interventions, the patient continued to experience episodes of dizziness and his blood pressure remained borderline low at 95/55 mmHg, with a heart rate of 105 bpm. This ongoing instability suggested that the bleeding was not fully controlled, necessitating further evaluation.

The medical team also considered the patient's use of aspirin, a factor that could aggravate bleeding tendencies by inhibiting platelet function. The decision was made to temporarily hold aspirin therapy until hemostasis could be achieved. The patient was closely monitored for any signs of worsening condition, such as increased fatigue, changes in mental status, or further drops in blood pressure, which would indicate the need for more aggressive intervention or surgical consultation. The team prepared for a possible repeat endoscopy or surgical intervention if stabilization could not be achieved through conservative measures.

Section 2

Throughout the night, the patient's condition showed signs of deterioration, prompting the medical team to reassess their approach. Despite ongoing fluid resuscitation and blood transfusions, the patient's blood pressure dropped further to 88/50 mmHg, and his heart rate increased to 115 bpm. He reported increased fatigue and had difficulty staying awake during routine checks, raising concerns about his mental status. A repeat CBC revealed a hemoglobin level that had only marginally improved to 8.0 g/dL, suggesting continued active bleeding or insufficient response to transfusions.

In response to these troubling indicators, the medical team ordered a CT angiography to better visualize the source of the bleeding. The imaging revealed extravasation of contrast in the sigmoid colon, confirming active bleeding from the diverticulum. Additionally, there was evidence of segmental colitis, suggesting an inflammatory process that could be contributing to the ongoing blood loss. Given these findings, the team initiated a conservative trial of bowel rest and intravenous corticosteroids, targeting the inflammatory component. However, the patient's persistent hemodynamic instability and worsening anemia necessitated a surgical consultation to discuss potential interventions, such as endoscopic clipping or resection of the affected bowel segment, should conservative measures fail to stabilize his condition.

This escalation highlighted the complexity of the patient's situation, requiring a multidisciplinary approach and careful consideration of risks versus benefits in potential surgical intervention. The nursing team continued to monitor closely for signs of worsening shock or gastrointestinal distress, prepared to act swiftly should the situation evolve further.

Section 3

As the day progressed, the nursing team observed a change in the patient's status that prompted immediate attention. His blood pressure continued to be unstable, with recordings of 85/48 mmHg despite aggressive fluid management, and his heart rate remained elevated at 120 bpm. The patient appeared increasingly pale, and his skin was cool and clammy, classic signs of hypovolemic shock. Neurological assessment revealed that he was now only responsive to verbal stimuli, a concerning decline from previous assessments where he was easily arousable but fatigued. His urine output had significantly decreased to less than 20 mL per hour, indicating potential acute kidney injury secondary to hypoperfusion.

In light of these alarming developments, lab results were expedited to reassess his hematologic status and renal function. The CBC showed a further drop in hemoglobin to 7.2 g/dL, confirming ongoing blood loss and necessitating additional transfusions. Blood urea nitrogen (BUN) and creatinine levels were elevated, suggesting compromised kidney function, likely due to both hypovolemia and the inflammatory process. The multidisciplinary team convened urgently, recognizing that the conservative approach was insufficient in addressing the patient's rapidly deteriorating condition.

The surgical team, in consultation with gastroenterology, decided to proceed with an urgent colonoscopy to attempt endoscopic intervention, aiming to stabilize the bleeding before considering more invasive surgical options. The nursing team prepared the patient for the procedure, ensuring continuous monitoring of vital signs and readiness to manage potential complications, such as further hemodynamic instability or arrhythmias due to ongoing blood loss. This critical juncture underscored the need for swift and decisive action to prevent irreversible organ damage and stabilize the patient. The team braced for the challenges ahead, aware that the next steps would be pivotal in the patient's journey to recovery.

Section 4

As the patient was prepped for the urgent colonoscopy, the nursing team remained vigilant, closely monitoring his vital signs and anticipating any changes in his condition. Despite the gravity of the situation, there was a palpable sense of determination among the healthcare providers to stabilize the patient. During the procedure, the gastroenterology team identified multiple diverticular lesions in the colon, with one actively bleeding site. They successfully achieved hemostasis through endoscopic clipping, a crucial step in managing the acute lower GI bleed. This intervention was a turning point, potentially reducing the source of blood loss and allowing for vital stabilization.

Post-procedure, the patient's vital signs showed a modest yet encouraging improvement; his blood pressure rose to 95/55 mmHg, and his heart rate decreased slightly to 110 bpm. However, his condition remained precarious due to the risk of rebleeding and ongoing hypovolemic shock. The nursing team maintained a heightened level of observation, continuously assessing his neurological status and perfusion. His urine output, still diminished, remained a concern, with a rate of 25 mL per hour, suggesting that renal function recovery would take time and further supportive measures.

The team decided to initiate a slow transfusion of packed red blood cells to improve his oxygen-carrying capacity and support perfusion. Concurrently, they administered low-dose vasopressors to stabilize his hemodynamics further. The nephrology team was consulted to evaluate the extent of kidney injury and guide renal support strategies. Recognizing the interconnected nature of his medical issues, the multidisciplinary team emphasized a holistic approach, balancing aggressive intervention with careful monitoring. This comprehensive plan aimed to address not only the immediate threat of bleeding but also the secondary complications, setting the stage for the next steps in the patient’s recovery journey.

Section 5

As the patient settled into the recovery room post-colonoscopy, the nursing team continued to monitor his condition meticulously. In the hours following the procedure, there was a noticeable shift in his status. Although the intervention had initially stabilized his bleeding, his blood pressure began to fluctuate, dipping occasionally to 88/50 mmHg, which was concerning for the potential of rebleeding or other complications. His heart rate, previously showing slight improvement, crept back up to 120 bpm. These subtle changes prompted a more thorough assessment and indicated the need for further diagnostic evaluation.

The laboratory results returned, revealing a hemoglobin level of 7.5 g/dL, down from 8.2 g/dL pre-procedure, highlighting an ongoing blood loss or hemodilution effect. Additionally, his lactate levels were elevated at 3.5 mmol/L, suggesting continued tissue hypoperfusion and metabolic stress. These findings necessitated a reassessment of the current management strategy, with a focus on ensuring adequate tissue oxygenation and addressing the potential for recurrent bleeding. The decision was made to adjust the transfusion rate slightly, aiming to improve his oxygen-carrying capacity more rapidly while maintaining cautious monitoring to avoid fluid overload.

In response to these developments, the multidisciplinary team reconvened to discuss the next steps in the patient's care. They considered the possibility of additional interventions, such as a repeat endoscopic evaluation or radiologic assessment, to identify any new or missed bleeding sources. Moreover, the nephrology team recommended continuing vigilant monitoring of the patient's renal function, as the risk of acute kidney injury remained significant. This comprehensive reevaluation emphasized the need for a dynamic approach, adapting to the patient's evolving condition and preparing for potential complications. The team remained committed to providing targeted interventions while maintaining a focus on the overall stabilization and recovery of the patient.