Table of Contents
- Definition and Background of Gastrointestinal Bleeding
- Epidemiology of Gastrointestinal Bleeding
- Etiology of Gastrointestinal Bleeding
- Symptoms of Gastrointestinal Bleeding
- Presentation of Gastrointestinal Bleeding
- Diagnosis of Gastrointestinal Bleeding
- Differential Diagnosis of Gastrointestinal Bleeding
- Therapy of Gastrointestinal Bleeding
- Review Questions
Definition and Background of Gastrointestinal Bleeding
Gastrointestinal bleeding is one of the common causes of hospital admissions and it is a life-threatening abdominal emergency. If the bleeding source is proximal to the ligament of Treitz, it is considered upper gastrointestinal bleeding.
Epidemiology of Gastrointestinal Bleeding
About 100,000 patients are hospitalized every year in the United States because of upper GI bleeding. About 70,000 UGIB patients are admitted to hospitals each year in the United Kingdom. Males have a 2-fold higher risk of developing upper GI bleeding than females; older patients (more than 60 years old) have a higher risk of mortality.
Etiology of Gastrointestinal Bleeding
Non-steroidal anti-inflammatory drugs (NSAIDs)
NSAIDs inhibit cyclooxygenase, which results in decreased synthesis of mucosal prostaglandin and leads to impaired mucosal defenses. There is a 40-fold increase in the risk of developing a gastric ulcer (leading to gastrointestinal bleeding) in patients who use NSAIDs on a daily basis, and the risk of duodenal ulcer formation increases to 8-fold in these patients.
The majority of patients presenting with upper gastrointestinal bleeding suffer from peptic ulcers. As the ulcer gets deeper into the mucosa, it causes weakening and necrosis of the arterial wall, eventually resulting in bleeding.
The upper stomach and the lower esophagus are inverted forcefully during vomiting, which may lead to a mucosal tear in one of these parts. The severity of the bleeding is determined by the depth of the tear in the mucosa. Sometimes, in rare cases, an esophageal rupture may occur, leading to a condition called Boerhaave syndrome.
Mallory-Weiss tears are tears in the mucosa of the gastric cardia, which results in massive upper gastrointestinal bleeding. About 15% of acute upper GI bleeding is caused by Mallory-Weiss tears.
Acute stress gastritis
Different predisposing clinical conditions, such as multiple trauma, shock, acute renal failure, and respiratory distress syndrome, may have the potential to alter the protective barriers of the mucosa.
Symptoms of Gastrointestinal Bleeding
Signs of gastrointestinal bleeding
Melena (black stool with bad odor)
- Hematochezia (red stools)
- Epigastric pain
- Diffuse abdominal pain
- Weight loss
It is important to do a thorough physical examination in order to evaluate for shock or blood loss. Blood pressure and pulse should be checked for patients presenting with upper GI bleeding. A physical examination should also include looking for signs of liver disease, such as gynecomastia, splenomegaly, ascites and spider angioma; or signs of a tumor, such as abdominal mass, nodular liver, and enlarged lymph nodes.
Presentation of Gastrointestinal Bleeding
A thorough history and physical examination are important in patients presenting with symptoms and signs of GI bleeding. It is important to ask about comorbid diseases, medications use, exposure to toxins, as well as the course of the symptoms.
Diagnosis of Gastrointestinal Bleeding
It is important to assess the level of blood loss in patients with gastrointestinal bleeding through a complete blood count with platelet count and differential. Patients should be assessed for a hemorrhagic shock as it has a high mortality risk up to 30%. Hemorrhagic shock can be classified into four classes based on the detected signs:
|Class 1||Class 2||Class 3||Class 4|
|Blood loss, mL||Up to 750||750–1500||1500–2000||> 2000|
|Blood loss, % blood volume||Up to 15%||15–30 %||30–40 %||> 40 %|
|Pulse rate, bpm||< 100||> 100||> 120||> 140|
Normal or increased
|Urine output, mL/h||> 35||30–40||20–30||14–20|
|Mildly anxious||Anxious and confused||Confused and lethargic|
|Crystalloid||and blood||Crystalloid and blood|
Blood type and crossmatch should be ordered, depending on the clinical assessment and the initial hemoglobin level of the patient. Because of hypovolemia and hypoperfusion, patients with GI bleeding usually require blood transfusions.
BMP and BUN
It is essential to evaluate for renal comorbidity using the basic metabolic profile (BMP). However, BUN levels may be elevated as a result of the blood in the upper intestine.
Coagulopathy should be documented by measuring the patient’s prothrombin time, activated partial thromboplastin time and international normalized ratio Chest radiographs
Ordering chest x-rays is useful in excluding several conditions, including effusion, aspiration pneumonia, as well as esophageal perforation. Perforated ileus and viscus can be excluded using upright radiographs.
Using endoscopy is very useful in both the diagnosis and management of GI bleeding. It can be used to detect the source of bleeding and manage it.
Computed tomography scanning (CT)
Different conditions can be evaluated using CT scanning and ultrasonography, such as liver cirrhosis, cholecystitis, pancreatitis with hemorrhage and pseudocyst, aortoenteric fistula, or other uncommon causes of gastrointestinal bleeding.
If endoscopy fails to identify the source of bleeding, then angiography can be useful in case the bleeding persists.
It is an important procedure used to confirm possible active bleeding or recent bleeding. The nasogastric tube can also reduce the chance of vomiting in patients.
Differential Diagnosis of Gastrointestinal Bleeding
Clinical pictures similar to gastrointestinal bleeding
- Mallory-Weiss tear
- Gastric varices
- Hemorrhagic gastritis
- Pancreatic pseudoaneurysm
- Aortoenteric fistula
- Cardiac cirrhosis
- Benign gastric tumors
- Celiac sprue
- Dengue fever
- Zollinger-Ellison syndrome
- Von Willebrand disease
- Abdominal aortic aneurysm
- Acute gastritis
- Esophageal cancer
- Barrett’s esophagus
- Esophageal varices
- Gastric outlet obstruction
- Peptic ulcer disease
Therapy of Gastrointestinal Bleeding
Treatment of gastrointestinal bleeding
Correction of the shock and coagulation abnormalities in order to stabilize the patient is the main goal in management.
Proton pump inhibitors (PPIs)
Treatment with high doses of proton pump inhibitors helps decrease the risk of needing endoscopy as a treatment procedure. PPIs maintain the level of gastric pH above 6, which protects an ulcer clot from fibrinolysis.
It is considered the method of choice in controlling hemorrhages from active ulcers. Seven techniques can be used in therapeutic endoscopy, which are:
- Heater-probe coagulation
- Bipolar electrode coagulation
- Injection of sclerosants or epinephrine
- Laser coagulation
- Use of banding devices
- Argon plasma coagulation
- Endoscopic application of clips
Surgical intervention may be required in some patients. Indications for surgical intervention include:
- Persistent recurrent bleeding after the failure of medical therapy and endoscopic hemostasis
- A hemorrhage that is severe and life-threatening and not responding to resuscitation.
- Other coexisting reasons for surgical intervention, such as obstruction, malignancy or perforation.
- If the patient is hospitalized for the second time because of peptic ulcer hemorrhage.
- Bleeding for a long time, with more than 50% loss of the patient’s blood volume
The correct answers can be found below the references.
1. A 72-year-old alcoholic gentleman is hospitalized and evaluated for a hematemesis episode. He has an alcoholic cirrhosis. He presented to the hospital a couple of days ago complaining of hypotension and black tarry stools. He was resuscitated and two units of blood were transfused to him. Esophageal varices were demonstrated by esophagogastroduodenoscopy (EGD) but there was no evidence of recent bleeding. Colonoscopy was performed as well and revealed old blood with no source for active bleeding. During the hospitalization time, he vomited coffee ground copious blood. On physical examination, you found that his blood pressure is 105/60 mmHg, his pulse is 100/min, and his temperature is 37.2 C (99.14 F). Laboratory studies revealed a hemoglobin level of 10.2 g/dl and INR 1.3. Which of the following is the next step in the management of this man, after resuscitation with intravenous fluid and placement of a nasogastric tube?
- Transjugular intrahepatic portosystemic shunt (TIPS)
- Balloon tamponade
- Intravenous nadolol
- Capsule endoscopy
- Repeat esophagogastroduodenoscopy (EGD)
2. A 52-year-old man presented to the hospital because of an episode of hematemesis one hour ago, which has subsided since then. His past medical history includes cirrhosis and known esophageal varices, which have been banded previously. By physical examination, his blood pressure is 100/60 mmHg, his pulse rate is 105, respiratory rate is 15, O2 96%, and his temperature is 37 C (98.6 F). In the emergency department, as you start your examination, his blood pressure drops to 90/60, and he starts to vomit bright red blood. His mental status changes within the next few minutes. On physical examination, you find that he withdraws only when you rub his sternum, he opens his eyes, and he is saying incoherent words. What is the most appropriate step in the management of this man?
- Start with chest compressions
- Transfer him to the operation room
- Start intravenous octreotide
- Endoscopic intervention
3. A 66-year-old patient comes to the emergency department because he passed a bloody stool. One of the steps in the workup of this patient is technetium-99 labeled erythrocyte scintigraphy. When is this the appropriate step in his workup?
- He continues to bleed and a colonoscopy does not reveal the source of bleeding.
- He stops bleeding and a colonoscopy does not reveal the source of bleeding.
- The bleeding source is not revealed by colonoscopy, but it is revealed by arteriogram.
- Blood is revealed by NG tube aspiration.
- A colonoscopy reveals the source of bleeding.