
A sudden, untreated gastrointestinal (GI) bleed can be deadly in hours or days. Without quick help, the risk of death is very high. This shows how urgent and critical it is to get fast, expert care.
At LIV Hospital, we focus on quick, new ways to treat GI bleed. The death rate for acute upper GI bleeding is 5-10%. This shows how serious this condition is.
GI bleeding is a serious issue that can cause big problems if not treated. We talk about the dangers of not treating GI bleeding. We also explain why getting help right away at a place like LIV Hospital is important.
Key Takeaways
- Untreated GI bleeding is a medical emergency with potentially fatal consequences.
- Mortality rates for acute upper GI bleeding are significant, ranging from 5-10%.
- Rapid and specialized intervention is critical for better results.
- LIV Hospital offers innovative and ethical care for GI bleeding patients.
- Getting medical help right away is key to avoiding serious issues.
What Is Gastrointestinal Bleeding

Gastrointestinal bleeding is when blood leaks from the GI tract. This can happen in different ways, based on where and how much it bleeds.
Definition and Medical Significance
Gastrointestinal (GI) bleeding means losing blood from the GI tract. This includes the esophagus, stomach, small intestine, and large intestine. It’s serious because it can lead to hypovolemic shock and even death if not treated quickly. GI bleeding is a big problem worldwide, causing a lot of sickness and death.
Acute vs. Chronic Bleeding
GI bleeding can be either acute or chronic.
- Acute GI Bleeding: This is sudden and can be very dangerous. It needs quick medical help to stop the bleeding.
- Chronic GI Bleeding: This bleeding happens slowly over time. It’s not as urgent as acute bleeding but can cause anemia and other problems if not treated.
Knowing if it’s acute or chronic GI bleeding helps doctors decide how to treat it.
- GI bleeding refers to blood loss from the gastrointestinal tract.
- It can be acute or chronic, each with different implications for patient care.
- Prompt medical attention is key to managing GI bleeding well.
Types of GI Bleeding
It’s important to know the different types of GI bleeding to get the right treatment. GI bleeding can happen in different parts of the gut. This helps doctors choose the best way to treat it.
Upper GI Bleeding
Upper GI bleeding happens in the esophagus, stomach, and duodenum. Common causes include peptic ulcers, esophageal varices, and Mallory-Weiss tears. Symptoms include hematemesis (vomiting blood) and melena (black, tarry stools).
A study shows why quick diagnosis and treatment are key. They help avoid serious problems.
Lower GI Bleeding
Lower GI bleeding comes from the small intestine, colon, or rectum. It’s often caused by diverticular disease, inflammatory bowel disease, and colorectal neoplasms. Symptoms can be bright red blood or maroon-colored stools, depending on the bleed’s location and severity.
Occult and Obscure Bleeding
Occult GI bleeding isn’t visible to the eye but is found through tests. It can lead to iron deficiency anemia or positive fecal occult blood tests. Obscure GI bleeding is when the source of bleeding is hard to find, even after initial tests. Finding the source can be tough and may need advanced tests like capsule endoscopy or deep enteroscopy.
|
Type of GI Bleeding |
Common Causes |
Symptoms |
|---|---|---|
|
Upper GI Bleeding |
Peptic ulcers, esophageal varices, Mallory-Weiss tears |
Hematemesis, melena |
|
Lower GI Bleeding |
Diverticular disease, inflammatory bowel disease, colorectal neoplasms |
Bright red blood per rectum, maroon-colored stools |
|
Occult and Obscure Bleeding |
Various, often small bowel lesions |
Iron deficiency anemia, positive fecal occult blood tests |
Understanding UGI (Upper Gastrointestinal) Bleeds

It’s important for both patients and doctors to understand UGI bleeding. This type of bleeding happens in the upper part of the digestive system. It includes the esophagus, stomach, and the start of the small intestine (duodenum).
Common Sources of UGI Bleeding
UGI bleeding often comes from certain areas in the upper digestive system. The main causes are:
- Peptic Ulcers: These are sores in the stomach or duodenum. They can be caused by Helicobacter pylori infection or NSAIDs.
- Esophageal Varices: These are big veins in the esophagus. They are common in people with liver cirrhosis and can bleed easily.
- Gastritis: This is inflammation of the stomach lining. It can cause bleeding.
- Mallory-Weiss Tears: These are tears in the esophagus’s lining. They often happen during intense or long vomiting or retching.
Risk Factors for UGI Bleeds
There are several factors that can increase the risk of UGI bleeding. These include:
- Chronic Use of NSAIDs: Long-term use of NSAIDs can irritate the stomach lining. This can lead to ulcers and bleeding.
- Liver Disease: Liver conditions like cirrhosis can cause esophageal varices. This increases the risk of UGI bleeding.
- Alcohol Abuse: Drinking too much alcohol can cause gastritis. This increases the risk of bleeding.
- Age: Older adults are at higher risk. This is because they often have more health problems and take medications that can cause bleeding.
Distinguishing Features of UGI Bleeds
UGI bleeding can show different symptoms. These symptoms can help doctors diagnose it. Common symptoms include:
- Vomiting Blood (Hematemesis): This is a classic symptom. The blood can be bright red or look like coffee grounds.
- Black, Tarry Stools (Melena): This happens when blood is digested. It results in black stools.
- Abdominal Pain: Pain in the upper abdomen can be a sign of the underlying cause of the bleeding.
Understanding UGI bleeding is key for early detection and treatment. This can greatly improve patient outcomes.
Common Causes of Lower GI Bleeding
It’s important to know why lower GI bleeding happens. This type of bleeding comes from the small intestine, colon, or rectum. We’ll look at the main reasons, their effects, and why they matter.
Diverticular Disease
Diverticular disease is a big reason for lower GI bleeding, mainly in older people. It happens when small pouches form in the colon wall. These pouches can bleed a lot, needing quick medical help.
Inflammatory Bowel Conditions
Inflammatory bowel disease (IBD) can also cause lower GI bleeding. This includes Crohn’s disease and ulcerative colitis. The bleeding can be mild or severe, along with symptoms like diarrhea and pain.
Chronic inflammation is key in these diseases. It can lead to serious problems if not treated right.
Hemorrhoids and Anal Fissures
Hemorrhoids and anal fissures can also cause bleeding. Hemorrhoids are swollen veins, and fissures are small tears in the anus. Both can cause bright red blood, often seen on toilet paper.
Though not usually dangerous, they can be very uncomfortable. Getting them treated is important.
Colorectal Neoplasms
Colorectal neoplasms, like polyps and cancer, can also cause bleeding. The bleeding can be hidden or visible, depending on the size and location. Early detection is key for better treatment results.
Screening for colorectal cancer is advised for those over 45 or with a family history.
Recognizing GI Bleed Symptoms
It’s key to spot the signs of GI bleeding early to avoid serious issues. GI bleeding shows up in different ways, based on where and how bad it is.
Warning Signs of Upper GI Bleeding
Upper GI bleeding has clear signs that need quick action. Look out for:
- Hematemesis: Vomiting blood or stuff that looks like coffee grounds.
- Melena: Seeing black, tarry stools.
- Feeling pain or discomfort in the belly.
These signs mean the bleeding is in the upper part of the GI tract. This includes the esophagus, stomach, and the start of the small intestine (duodenum).
Symptoms of Lower GI Bleeding
Lower GI bleeding has its own set of symptoms. These include:
- Hematochezia: Seeing bright red blood when you go to the bathroom.
- Stools that are maroon in color.
- Feeling crampy or tender in the belly.
This type of bleeding comes from further down, like the small intestine, colon, or rectum.
When to Seek Emergency Medical Care
If you see signs of GI bleeding, know when to get help fast. You should get emergency care if you notice:
- Heavy bleeding or a fast heart rate.
- Signs of shock, like pale skin, fainting, or cold sweats.
- Severe belly pain.
- Having trouble breathing.
Acting quickly can really help if you’re dealing with GI bleeding.
Diagnosing GI Bleeding
Diagnosing GI bleeding is a detailed process. It involves clinical checks, lab tests, and special procedures. We’ll look at how these methods help find the cause of GI bleeding.
Initial Assessment and Physical Examination
When someone might have GI bleeding, we start with a detailed medical history and physical check. We check their vital signs for signs of shock, like a fast heart rate or low blood pressure.
A physical exam can also show signs of liver disease. This could mean the GI bleeding is related to the liver.
Laboratory and Blood Tests
Labs are key in finding out about GI bleeding. We do a complete blood count (CBC) to see how much blood loss there is. This helps us understand how serious it is.
We also check coagulation and blood type. These tests are important for treating the bleeding.
|
Test |
Purpose |
|---|---|
|
CBC |
Assess hemoglobin and hematocrit levels |
|
Coagulation Studies |
Evaluate clotting function |
|
Blood Typing |
Prepare for possible blood transfusion |
Endoscopic Procedures and Imaging
Endoscopy is a main tool for finding GI bleeding. It lets us see where the bleeding is coming from. We might do an upper endoscopy (EGD) for upper GI bleeding or a colonoscopy for lower GI bleeding.
Imaging like CT angiography can also help find the bleeding source. This is useful when endoscopy doesn’t work or isn’t possible.
In summary, finding GI bleeding needs a full approach. This includes clinical checks, lab tests, and special procedures. Knowing about these tools helps doctors find and treat GI bleeding well.
Severity Classification of GI Bleeds
GI bleeding can vary from mild to severe, needing a clear severity classification. This classification is key for predicting outcomes and guiding treatment. It helps doctors assess risks and make the best decisions for patients.
Mild to Moderate Bleeding
Mild to moderate GI bleeding shows few symptoms and stable vital signs. Patients might have mild anemia or slight changes in stool or vomit. “Early recognition and proper management can stop more severe bleeding,” say gastroenterology guidelines.
Severe Bleeding
Severe GI bleeding is a medical emergency with significant blood loss. It causes severe anemia, big changes in vital signs, and can be life-threatening. Prompt action is vital to save lives.
Massive Hemorrhage
Massive hemorrhage means quick loss of a lot of blood, needing fast and strong action. It’s a serious condition that requires immediate resuscitation efforts. Treatment involves a team effort, including endoscopy, medicine, and sometimes surgery.
Risk Stratification Tools
Risk stratification tools are key for figuring out GI bleeding severity and predicting outcomes. They help spot high-risk patients, allowing for timely and right treatment. Tools like the Rockall score and the Blatchford score are commonly used.
In summary, classifying GI bleed severity is critical in managing GI bleeding patients. Understanding the severity helps doctors tailor treatments to better patient outcomes.
Immediate Complications of Untreated GI Bleeding
GI bleeding that is left untreated can have devastating effects on the body. It’s critical to seek medical attention immediately. This is to prevent severe and potentially life-threatening complications.
Hypovolemic Shock and Circulatory Collapse
One of the most critical immediate complications of untreated GI bleeding is hypovolemic shock. This happens when a lot of blood is lost, causing poor circulation. It leads to a drop in blood pressure.
Vital organs don’t get enough oxygen and nutrients. This can cause circulatory collapse. If not treated quickly, hypovolemic shock can be fatal.
Acute Anemia and Oxygen Deprivation
Untreated GI bleeding can also result in acute anemia. This is because of the loss of red blood cells. With fewer red blood cells, the body can’t transport oxygen well.
This leads to oxygen deprivation. Prolonged oxygen deprivation can damage vital organs, including the heart and brain.
Multi-Organ Failure
As GI bleeding continues without treatment, the risk of multi-organ failure increases. The lack of blood circulation and oxygen delivery can cause organs to fail one by one. This includes the kidneys, liver, and lungs.
This complication is associated with high mortality rates. It requires immediate medical intervention.
Electrolyte Imbalances
Untreated GI bleeding can also lead to electrolyte imbalances. The loss of blood and fluids disrupts the balance of essential electrolytes. These are needed for heart function and other bodily processes.
Electrolyte imbalances can cause serious complications. This includes cardiac arrhythmias.
In conclusion, the immediate complications of untreated GI bleeding are severe and potentially life-threatening. It’s essential to seek medical attention promptly. This is to prevent these complications and improve outcomes.
Survival Timeline with Untreated GI Bleeding
The survival timeline for those with untreated GI bleeding is very important. It shows how severe the condition is and what might happen. This timeline changes based on how bad the bleed is, the patient’s health, and other factors.
First Hours: Critical Period
The first hours after a GI bleed are very important. A lot of blood loss can cause hypovolemic shock, a serious condition that needs quick medical help. How well the body handles the blood loss and its health at this time greatly affects the outcome.
24-72 Hours: Developing Complications
After the initial shock is managed, or if it’s not, problems start to show up. These can include acute anemia and oxygen deprivation to important organs, leading to worse health. The chance of multi-organ failure grows, which can greatly affect survival chances.
First Week: Cascading Effects
The first week is key for those with untreated GI bleeding. If blood loss or treatment is not enough, many problems can follow. These include electrolyte imbalances and more organ damage. The patient’s health and any other health issues play a big role in how they do during this time.
Beyond One Week: Long-term Consequences
For those who make it past the first weeks, the long-term effects of untreated GI bleeding are serious. These can include chronic anemia, ongoing fatigue, and a higher chance of more bleeding. If the cause of the GI bleed is not fixed, it can keep being a risk, making ongoing care very important.
Factors Affecting Survival Rates
It’s important to know what affects survival rates in GI bleeding. Several key elements play a role in patient outcomes. We will dive into these critical factors.
Age and Baseline Health Status
Age and health status are big factors. Older adults and those with health issues face higher risks. Advanced age can make managing GI bleeding harder, making quick and right care even more important.
Hemoglobin Levels and Blood Pressure
Hemoglobin levels and blood pressure are key indicators. Low hemoglobin means a lot of blood loss. Abnormal blood pressure can signal shock or dehydration. Keeping a close eye on these is vital for understanding the bleed’s severity and guiding treatment.
Comorbidities: Liver, Renal, and Malignant Diseases
Comorbidities like liver disease, renal failure, or cancer can greatly affect survival. These conditions can make diagnosing and treating GI bleeding harder. For example, liver disease can cause bleeding problems. We must think about these when looking at patient outcomes.
Bleeding Source and Severity
The source and severity of the GI bleed are also key. Bleeding from varices or malignancies may have different outcomes than ulcers or diverticula. The severity of the bleed, based on blood loss and stability, determines the needed intervention.
In summary, survival rates in GI bleeding depend on many factors. These include age, health, clinical indicators, comorbid conditions, and the bleed’s characteristics. Understanding these helps us give better care and improve patient results.
Mortality Statistics for Untreated GI Bleeding
Untreated GI bleeding is very dangerous and can lead to death. It’s important to get medical help right away. The severity of this condition is shown by various statistics that highlight the risks of not getting treatment.
Hospital Mortality Rates
Hospital death rates for GI bleeding are between 5-10%. This shows a big risk for those who don’t get quick and right care. The death rates can vary because of how bad the bleed is, the patient’s health, and how fast they get medical help.
Increased Risk in the First Month
The first month after a GI bleed is very important. Studies show a 27-fold increase in death risk during this time. This shows why it’s key to watch closely and follow up to avoid more problems.
Long-term Mortality Rates
Long-term death rates for untreated GI bleeding are also high. Within three years, death rates can hit 36.7%. This shows the long-lasting effect of GI bleeding on survival and the need for ongoing care.
Impact of Treatment Delay on Survival
Waiting too long to treat GI bleeding can be very harmful. Quick medical help is key to lowering death rates and better outcomes. The effect of waiting too long to get help shows how important it is to act fast.
|
Time Frame |
Mortality Rate |
Risk Factor |
|---|---|---|
|
In-Hospital |
5-10% |
Severity of Bleed |
|
First Month |
27-fold increase |
Comorbidities |
|
Three Years |
36.7% |
Long-term Complications |
These stats show how vital it is to seek medical help right away for GI bleeding. Quick action can greatly improve survival chances and lower the risk of long-term problems.
Treatment Approaches for GI Bleeding
Managing GI bleeding involves several steps. First, we focus on stabilizing the patient. Then, we use endoscopy and medicine to stop the bleeding. Our goal is to keep the patient safe and prevent future bleeding.
Initial Resuscitation and Stabilization
The first step is to make sure the patient is stable. We check how bad the bleeding is and give fluids to replace lost blood. We also make sure the patient’s organs get enough oxygen.
Key components of initial resuscitation include:
- Fluid resuscitation with crystalloids or colloids
- Blood transfusions to maintain adequate hemoglobin levels
- Monitoring vital signs and urine output
Endoscopic Interventions
Endoscopy is key in treating GI bleeding. It helps us find and stop the bleeding. We use different methods to control the bleeding.
Common endoscopic interventions include:
- Thermal coagulation
- Mechanical hemostasis with clips or bands
- Sclerotherapy or injection of hemostatic agents
Pharmacological Management
Medicine is also important in treating GI bleeding. We use drugs to lower acid levels, help blood clot, and prevent more bleeding.
Common pharmacological agents include:
- Proton pump inhibitors (PPIs) to reduce acid secretion
- Tranexamic acid to promote clotting
- Somatostatin analogues to reduce splanchnic blood flow
Surgical and Radiological Options
If other treatments don’t work, we might need surgery or radiology. These are for severe or ongoing bleeding.
Surgical options include:
- Emergency surgery to control bleeding
- Resection of the bleeding site or affected area
Radiological options include:
- Angiographic embolization to control bleeding
- Transjugular intrahepatic portosystemic shunt (TIPS) for portal hypertension
The Critical Importance of Prompt Medical Attention
GI bleeding is a serious issue that needs quick action and medical help. When someone has GI bleeding, getting medical care fast is key. It helps avoid serious problems and improves their chances of getting better.
Impact on Immediate Survival
Getting medical help quickly can save lives. Research shows early treatment can lower death rates from GI bleeding. A study in the BMJ found that quick action can greatly help patients.
Several things affect immediate survival:
- How long it takes to get medical help
- The severity of the bleeding
- The patient’s overall health
Reduction of Long-term Complications
Quick medical care not only saves lives but also lowers the chance of long-term problems. If GI bleeding isn’t treated, it can cause chronic issues like anemia. This can really affect a person’s life quality. Early treatment helps avoid these issues.
|
Complications |
Description |
Impact of Prompt Treatment |
|---|---|---|
|
Anemia |
Condition characterized by low red blood cell count |
Reduced risk with timely treatment |
|
Chronic Fatigue |
Prolonged feeling of exhaustion |
Minimized with early intervention |
|
Gastrointestinal Damage |
Potential long-term damage to the GI tract |
Prevented or reduced with prompt care |
Improved Quality of Life Outcomes
Patients who get quick medical help for GI bleeding tend to have better lives. Good and fast treatment helps them heal faster and get back to their usual activities sooner.
The importance of prompt medical attention cannot be overstated. It’s vital for better survival rates, fewer complications, and a better life for those with GI bleeding.
Prevention Strategies for GI Bleeding
GI bleeding can often be prevented through healthy lifestyle choices and careful medication use. Targeted screening for high-risk individuals is also key. By understanding and using these strategies, we can lower the risk of GI bleeding and its complications.
Lifestyle Modifications
One of the main ways to prevent GI bleeding is through lifestyle changes. This includes:
- Avoiding too much alcohol, which can irritate the stomach lining and increase bleeding risk.
- Quitting smoking, as it can reduce blood flow to the stomach and intestines, making them more prone to bleeding.
- Eating a healthy diet full of fruits, vegetables, and whole grains to support gut health.
- Staying active to improve circulation and overall health.
Medication Management and Monitoring
Managing medications carefully is key in preventing GI bleeding. This means:
- Using NSAIDs wisely and under doctor’s watch, as they can raise bleeding risk.
- Avoiding NSAIDs and anticoagulants together unless necessary and under doctor’s watch.
- Watching for signs of GI bleeding when on medications that can increase this risk, like anticoagulants and certain antiplatelet drugs.
We suggest talking to your healthcare provider about your medications. This can help you understand the risks and benefits of your specific drugs.
Regular Screening for High-Risk Individuals
For those at high risk of GI bleeding, regular screening is essential. This includes:
- Regular endoscopic exams for those with a history of GI ulcers or bleeding.
- Screening for colorectal cancer, which can cause GI bleeding.
- Monitoring liver health for those with cirrhosis or other liver conditions that may increase GI bleeding risk.
|
Prevention Strategy |
Description |
Benefit |
|---|---|---|
|
Lifestyle Modifications |
Avoiding alcohol, quitting smoking, healthy diet, regular exercise |
Reduces risk of GI irritation and bleeding |
|
Medication Management |
Judicious use of NSAIDs, avoiding concurrent NSAID and anticoagulant use |
Minimizes risk of medication-induced GI bleeding |
|
Regular Screening |
Endoscopic exams, colorectal cancer screening, liver health monitoring |
Early detection and management of risk factors |
By using these prevention strategies, we can greatly reduce GI bleeding incidence and its effects. It’s vital for individuals, and those at high risk, to work with their healthcare providers. Together, they can create a personalized prevention plan.
Special Considerations for High-Risk Populations
GI bleeding is a big problem for certain groups. These include the elderly, people with health issues, and those taking many medicines.
Elderly Patients
The elderly face a higher risk of GI bleeding. This is because they often have more health problems, take many medicines, and their bodies change with age. We need to watch their meds closely and look out for bleeding signs.
Patients with Cirrhosis and Portal Hypertension
Those with cirrhosis and portal hypertension are at risk for serious bleeding. We should think about using beta-blockers and endoscopic treatments to prevent this.
Individuals on Anticoagulants and Antiplatelets
People on blood thinners and antiplatelets are more likely to bleed. We must weigh the good and bad of these medicines. Sometimes, we might choose other treatments instead.
Patients with Previous GI Bleeding Episodes
Those who have bled before are more likely to bleed again. We need to find out why they bled and how to stop it from happening again.
Managing high-risk groups requires careful thought. Here’s what we should do:
- Risk Stratification: Find out who’s most at risk for GI bleeding.
- Personalized Treatment Plans: Make plans that fit each patient’s needs.
- Close Monitoring: Keep a close eye on patients for bleeding signs and adjust plans as needed.
By focusing on these special needs, we can help these vulnerable patients better.
Conclusion
GI bleeding is a serious condition that needs quick and effective treatment. We’ve talked about its causes, symptoms, diagnosis, and treatment options in this article.
Knowing the risks of GI bleeding and taking steps to prevent it can help a lot. Getting medical help right away is key to managing GI bleeding. This can greatly improve your chances of recovery.
We’ve covered the main points to stress the importance of seeking medical help fast if you have GI bleeding symptoms. It’s vital to be aware and act quickly to avoid serious health issues.
In short, GI bleeding is a medical emergency that requires immediate care. We hope this information helps people take steps to protect their health and well-being.
FAQ
What is gastrointestinal bleeding?
Gastrointestinal bleeding is when blood leaks in the digestive system. This includes the esophagus, stomach, small intestine, and colon.
What are the types of GI bleeding?
GI bleeding is divided into upper and lower types. Upper bleeding happens in the esophagus, stomach, and duodenum. Lower bleeding occurs in the small intestine, colon, and rectum.
What are the symptoms of GI bleeding?
Symptoms include vomiting blood, black stools, and fresh blood in the stool. These signs depend on where and how much blood is lost.
How is GI bleeding diagnosed?
Doctors use several steps to find the cause of GI bleeding. They start with a check-up, lab tests, and then use endoscopy and imaging.
What are the complications of untreated GI bleeding?
Without treatment, GI bleeding can lead to serious problems. These include shock, anemia, organ failure, and imbalances in electrolytes.
How long can you survive with untreated GI bleeding?
Survival time varies with the severity of bleeding and the patient’s health. Quick medical help is key to increase chances of survival.
What are the risk factors for GI bleeding?
Risks include age, health status, and conditions like liver and kidney disease. Also, taking blood thinners and antiplatelets increases risk.
How is GI bleeding treated?
Treatment starts with stabilizing the patient. Then, doctors use endoscopy, medicine, and sometimes surgery or radiology.
Can GI bleeding be prevented?
Prevention involves lifestyle changes, careful medicine use, and regular check-ups for those at risk.
What are the mortality statistics for untreated GI bleeding?
Untreated GI bleeding is very dangerous. Hospital death rates are 5-10%. There’s a high risk of death in the first month.
Why is prompt medical attention critical for GI bleeding?
Quick medical care is vital for GI bleeding. It can save lives, prevent complications, and improve quality of life.
What are the special considerations for high-risk populations?
Certain groups, like the elderly and those with liver disease, need special care. They also include those on blood thinners and those with a history of bleeding.
What is the significance of upper GI bleeding?
Upper GI bleeding is very serious. It needs fast diagnosis and treatment. Common causes are peptic ulcers and esophageal varices.
What is occult GI bleeding?
Occult GI bleeding is not visible to the eye. It’s found through lab tests.
How does GI bleeding affect quality of life?
GI bleeding can greatly affect life quality. Quick treatment can improve outcomes and lower the risk of future problems.
References
National Center for Biotechnology Information. Evidence-Based Medical Insight. Retrieved from https://pmc.ncbi.nlm.nih.gov/articles/PMC6453579/