Gi bleed - Nursing Case Study

Pathophysiology

• Primary mechanism: Damage to the gastrointestinal mucosa, often from peptic ulcers or erosive gastritis, leads to the breakdown of protective barriers. This exposes blood vessels, resulting in bleeding as acid and digestive enzymes further erode tissue.

• Secondary mechanism: Variceal bleeding, typically from portal hypertension in liver cirrhosis, causes increased pressure in portal veins. This leads to engorged, fragile esophageal or gastric varices that can rupture and bleed profusely.

• Key complication: Massive blood loss can lead to hypovolemic shock, characterized by decreased blood volume and impaired tissue perfusion, necessitating urgent medical intervention to restore hemodynamic stability.

Patient Profile

Demographics:

58-year-old male, construction worker

History:

• Key past medical history: Hypertension, peptic ulcer disease

• Current medications: Lisinopril, omeprazole

• Allergies: Penicillin

Current Presentation:

• Chief complaint: Black, tarry stools and weakness

• Key symptoms: Abdominal pain, dizziness, fatigue, lightheadedness

• Vital signs: Blood pressure 95/60 mmHg, heart rate 115 bpm, respiratory rate 22 breaths per minute, temperature 98.6°F

Section 1

As the medical team initiates the initial assessment of the 58-year-old male patient, his condition reveals further concerning details. Upon examination, his mucous membranes appear pale, and capillary refill time is prolonged, indicating potential hypoperfusion. Abdominal palpation elicits tenderness, particularly in the epigastric region, which correlates with his history of peptic ulcer disease. Despite the administration of intravenous fluids, his blood pressure remains low at 90/58 mmHg, and his heart rate persists at 118 bpm, suggesting ongoing compensatory mechanisms for volume depletion. Orthostatic vital signs are performed, revealing a significant drop in blood pressure and increase in heart rate upon standing, further supporting the suspicion of hypovolemic shock due to gastrointestinal bleeding.

Laboratory tests are expedited, with results showing a hemoglobin level of 7.2 g/dL and hematocrit of 22%, confirming significant anemia secondary to blood loss. Serum lactate levels are elevated at 3.5 mmol/L, indicative of tissue hypoperfusion and anaerobic metabolism. The patient is urgently typed and crossmatched for blood transfusion, and two units of packed red blood cells are ordered to improve his hemodynamic status. Additionally, a nasogastric tube is inserted, returning coffee-ground emesis, which further substantiates the upper gastrointestinal source of bleeding.

As the team continues to monitor the patient, they consider the potential need for endoscopy to locate and possibly treat the bleeding source directly. Meanwhile, the possibility of underlying variceal bleeding is considered, given the patient's age and risk factors, prompting plans for a more thorough hepatic assessment to rule out liver cirrhosis. Throughout this process, the medical team remains vigilant for signs of impending complications such as worsening shock or the development of acute kidney injury, which could complicate the patient's recovery and require further intervention.

Section 2

As the patient receives the first unit of packed red blood cells, there is a modest improvement in his hemodynamic status; his blood pressure rises to 98/62 mmHg, and his heart rate decreases slightly to 112 bpm. However, the medical team notes that his urine output has been declining, now measuring only 15 mL over the last hour, raising concerns about renal perfusion and the potential onset of acute kidney injury. Repeat laboratory tests are ordered, revealing a serum creatinine level of 2.1 mg/dL, up from a baseline of 0.9 mg/dL, and blood urea nitrogen (BUN) of 45 mg/dL, indicating possible prerenal azotemia due to hypovolemia and decreased renal perfusion.

Despite the initiation of blood transfusions, the patient's mental status begins to fluctuate, with episodes of confusion and disorientation. The medical team attributes these changes to both anemia and the possibility of encephalopathy, potentially linked to an undiagnosed liver condition. To address this, lactulose is considered to manage elevated ammonia levels if liver dysfunction is confirmed, while maintaining a focus on stabilizing his hemodynamic status.

Realizing the critical need for targeted treatment, the team prioritizes an urgent endoscopy to identify and manage the bleeding source. Meanwhile, a comprehensive hepatic panel and abdominal ultrasound are requested to assess liver function and structure, which might explain the variceal bleeding suspicion. As they prepare for these procedures, the team remains alert for further hemodynamic instability, ensuring that the patient receives adequate fluid resuscitation and monitoring for any additional signs of multi-organ dysfunction.

Section 3

As the medical team prepares to conduct the urgent endoscopy, the patient's condition takes a turn with the emergence of new complications. Despite receiving a second unit of packed red blood cells, his heart rate remains elevated at 110 bpm, and his blood pressure has dipped slightly to 92/58 mmHg, suggesting ongoing hemodynamic instability. More concerning is the patient's continued decrease in urine output, now registering only 10 mL over the past hour, despite aggressive fluid resuscitation efforts. The repeat renal function tests show further deterioration, with serum creatinine rising to 2.4 mg/dL and BUN increasing to 52 mg/dL, reinforcing the suspicion of acute kidney injury due to persistent hypoperfusion.

Simultaneously, the patient's mental status worsens, with more frequent episodes of confusion and agitation. His family reports that he has a history of alcohol use, prompting the team to consider alcoholic liver disease as a potential underlying etiology. The hepatic panel returns with elevated liver enzymes—AST at 120 U/L, ALT at 95 U/L, and a bilirubin level of 3.5 mg/dL—further supporting this hypothesis. The abdominal ultrasound reveals evidence of cirrhosis with splenomegaly, raising the suspicion of variceal bleeding as the source of the GI bleed. Given these findings, lactulose is initiated to address hepatic encephalopathy, and the team prepares for possible variceal banding during the endoscopy.

The patient's evolving clinical picture underscores the critical need for timely intervention to address both the acute GI bleed and the underlying liver dysfunction. The medical team prioritizes maintaining hemodynamic support while closely monitoring for signs of multi-organ failure. The next steps involve coordinating a multidisciplinary approach to manage the complex interplay of gastrointestinal, renal, and hepatic issues, emphasizing the importance of comprehensive care in stabilizing the patient's condition and preventing further deterioration.

Section 4

As the medical team proceeds with the urgent endoscopy, they are met with additional complications in the patient's condition. During the procedure, significant esophageal varices are identified and successfully banded, temporarily controlling the source of the gastrointestinal bleed. However, post-procedure, the patient remains hypotensive with a blood pressure of 88/54 mmHg, despite receiving ongoing fluid resuscitation and blood products. His heart rate has increased to 120 bpm, indicating persistent hemodynamic instability.

The patient's renal function continues to decline, with the latest lab results showing a serum creatinine of 2.9 mg/dL and BUN of 65 mg/dL, confirming the progression of acute kidney injury. Meanwhile, his neurological status deteriorates further; he becomes increasingly lethargic and difficult to rouse, raising concerns for worsening hepatic encephalopathy despite the initiation of lactulose. The lactulose has resulted in minimal bowel movements, insufficient to significantly reduce ammonia levels, which are now elevated at 72 µmol/L.

The medical team must now integrate these findings into their ongoing management plan. The priority is to stabilize the patient's hemodynamics while addressing the consequences of acute kidney injury and hepatic encephalopathy. The nephrology team is consulted to evaluate the potential need for renal replacement therapy, given the worsening renal function and oliguria. The hepatology team is also engaged to explore additional strategies for managing the liver dysfunction and its complications. This coordinated approach is essential to prevent further deterioration and to support the patient's recovery.

Section 5

As the medical team continues to manage the patient's condition, new diagnostic results from an arterial blood gas analysis reveal a worsening metabolic acidosis with a pH of 7.28, a bicarbonate level of 18 mEq/L, and a base deficit of -8. This acidosis is likely multifactorial, stemming from both the acute kidney injury and potential lactic acidosis due to ongoing hemodynamic instability. Furthermore, the patient's liver function tests show a further elevation in liver enzymes, with an AST of 320 IU/L and ALT of 250 IU/L, suggesting continued hepatic stress and dysfunction.

In light of these findings, the nephrology team recommends initiating continuous renal replacement therapy (CRRT) to address the acute kidney injury, improve fluid overload, and correct the acidosis. This intervention is expected to provide renal support while allowing more precise control of fluid balance, potentially stabilizing the patient's hemodynamics. Concomitantly, the hepatology team suggests adding rifaximin to the treatment regimen in an effort to enhance ammonia clearance and improve the patient's neurological status, given the suboptimal response to lactulose alone.

The medical team's next steps focus on closely monitoring the patient's response to these interventions, with particular attention to changes in vital signs, renal function, and neurological status. The goal is to achieve hemodynamic stabilization, improve renal function, and reduce the severity of hepatic encephalopathy. The patient’s progress will determine if additional adjustments to the therapeutic plan are necessary, emphasizing the need for dynamic clinical reasoning and prompt adaptation to evolving clinical scenarios.