Cholecystitis

Cholecystitis is the inflammation of the gallbladder. The gallbladder is a small, hollow, pear-shaped organ below the liver on the upper right side of your abdomen. The gallbladder stores bile, a digestive enzyme that is essential for the digestion of fats in the small intestine.¹

Cholecystitis can manifest as either:

• Acute Cholecystitis - The sudden onset of inflammation due to the blockage of the cystic duct or impaired emptying of the gallbladder²
• Chronic Cholecystitis - Long-term inflammation resulting from repeated episodes of acute cholecystitis, leading to a thickened and scarred gallbladder³

Pancreatitis

Pancreatitis refers to the inflammation of your pancreas. The pancreas is a gland located behind the stomach. The pancreas produces digestive enzymes that are secreted into the small intestine to assist in the digestion of food, as well as hormones such as insulin and glucagon to control blood sugar levels.⁴

Pancreatitis also manifests in two forms:

• Acute Pancreatitis - A sudden inflammation that can range from mild discomfort to a severe, life-threatening illness
• Chronic Pancreatitis - Long-standing inflammation that alters the pancreas's normal structure and functions⁵

Causes of cholecystitis

What causes acute cholecystitis?

There are two main categories of what causes acute cholecystitis:

• Calculous cholecystitis - The most common and typically less severe form of acute cholecystitis, accounts for approximately 95% of all cases. Calculous cholecystitis arises when a gallstone obstructs the main opening into the gallbladder, known as the cystic duct. The blockage hinders the flow of bile from the gallbladder, causing bile to accumulate, increasing the internal pressure, and resulting in inflammation
• Acalculous cholecystitis - This is the inflammation of the gallbladder without the presence of gallstones. Although less common, it tends to be more severe than calculous cholecystitis. The exact cause remains unclear, but it frequently develops as a complication of severe illnesses, infections, or injuries that harm the gallbladder⁶

What causes chronic cholecystitis?

Chronic cholecystitis can also be categorised into calculous and acalculous types. It is usually caused by recurrent episodes of acute inflammation or persistent irritation from gallstones, which trigger an inflammatory response in the wall of the gallbladder.³

Risk factors for cholecystitis

Modifiable risk factors

• Obesity - Excess body weight increases the cholesterol level in bile, promoting gallstone formation
• Rapid Weight Loss - Rapid weight loss can lead to the development of gallstones
• Pregnancy - Pregnancy increases the risk due to hormonal changes that affect bile composition^{2, 3}

Non-modifiable risk factors

• Age - The risk of cholecystitis increases with age, particularly in people over the age of 40
• Sex - Women are more likely to develop cholecystitis than men, partly due to hormonal influences
• Family History - A family history of gallstones or cholecystitis increases the risk⁷

Causes of pancreatitis

What causes acute pancreatitis?

The most common causes include:⁸

• Gallstones - This is the most common cause of acute pancreatitis. Gallstones can block the bile duct or pancreatic duct, leading to a backup of pancreatic enzymes, which then cause inflammation
• Alcohol abuse - Chronic and excessive alcohol consumption is a significant cause of acute pancreatitis

Less common causes include:⁵

• Hypertriglyceridemia - Extremely high levels of triglycerides in the blood can lead to pancreatitis
• Infections - Some viral infections, such as mumps or coxsackie virus, can trigger pancreatitis
• Medications - Certain medications can induce acute pancreatitis as a side effect
• Autoimmune Conditions - Autoimmune pancreatitis occurs when the body's immune system attacks the pancreas, causing inflammation

What causes chronic pancreatitis?

The most common cause is: 

• Chronic Alcohol Abuse - This is the most common cause of pancreatitis in adults. Long-term, excessive alcohol consumption leads to repeated episodes of acute pancreatitis, which eventually causes chronic inflammation and scarring of the pancreas.

Less common causes include:

• Smoking - Tobacco use is a significant risk factor that can exacerbate other causes of chronic pancreatitis
• Autoimmune chronic pancreatitis
• Obstruction of the pancreatic duct - Conditions such as pancreatic duct strictures, tumours, or gallstones can cause blockages, leading to chronic inflammation
• Idiopathic Chronic Pancreatitis - In many cases, the exact cause of chronic pancreatitis cannot be identified. These are referred to as idiopathic cases⁹

Risk factors for pancreatitis

• Heavy Alcohol Use - Chronic consumption can lead to both acute and chronic pancreatitis
• Family History - Genetic predisposition increases risk
• High Triglycerides - Elevated levels in the blood can cause acute pancreatitis¹⁰

Symptoms and diagnosis

Symptoms of cholecystitis

• Abdominal pain - Typically severe and located in the upper right quadrant; may radiate to the back or right shoulder
• Nausea and vomiting - Usually occurs after meals and often accompanies the pain
• Fever - A mild to moderate fever might be present, indicating infection and inflammation¹¹

Symptoms of pancreatitis

• Upper Abdominal Pain - Severe pain that can radiate to the back; worsens after eating
• Nausea and vomiting - Persistent and often severe
• Fever and rapid pulse - Indicate systemic inflammation⁵

Diagnostic methods for cholecystitis and pancreatitis

• Physical Examination - Checking for abdominal pain, swelling, or tenderness 
• Blood Tests - Elevated levels of liver enzymes, bilirubin, and white blood cells suggest cholecystitis; elevated pancreatic enzymes (amylase and lipase) indicate pancreatitis.
• Imaging Studies:
  • Ultrasound scan - First-line imaging for gallstones and gallbladder inflammation
  • CT scan - Provides detailed images of the pancreas, gallbladder, and bile ducts to detect inflammation, necrosis, and complications
  • MRI scan - Used for detailed imaging of the bile and pancreatic ducts
• Endoscopic Procedures (ERCP) - Combines endoscopy and fluoroscopy to diagnose and treat conditions of the bile and pancreatic ducts^3,12

Treatment options

Treatment for cholecystitis

Medical management

4. Antibiotics - Used to treat bacterial infection if present
5. Pain relief - Medications like non-steroidal anti-inflammatory drugs (NSAIDs) or opioids to manage pain

Surgical management: 

6. Laparoscopic Cholecystectomy - Minimally invasive removal of the gallbladder, preferred for most patients
7. Open Cholecystectomy - Traditional surgery used in complicated cases or when laparoscopic surgery is not feasible¹³

Treatment for Pancreatitis

Acute pancreatitis management

• Hospitalisation - Required for most cases to monitor and treat complications
• Fluid replacement - The use of intravenous (IV) fluids to prevent dehydration
• Pain management - Strong analgesics to control severe pain
• Nutritional support - This may involve fasting initially, followed by gradual reintroduction of oral feeding or the use of a feeding tube

Chronic pancreatitis management

• Pain management - Long-term use of pain medications
• Enzyme supplements - To aid digestion and nutrient absorption
• Dietary changes - Low-fat, high-protein diet to minimise symptoms
• Surgery - In some cases, surgery might be necessary to remove obstructions, drain cysts, or remove a part of the pancreas¹⁴

Prevention

Preventing cholecystitis

• Healthy diet - Low in fat and cholesterol, high in fibre
• Regular exercise - Helps maintain a healthy weight and reduce cholesterol levels
• Weight management - Avoid rapid weight loss or gain, which can promote gallstone formation^2,3

Preventing pancreatitis

• Limiting alcohol intake - Reducing the risk of alcohol-related pancreatitis
• Healthy diet - Low in fats and refined sugars, high in fruits, vegetables, and whole grains
• Regular exercise - Helps maintain overall health and reduce triglyceride levels
• Monitoring medications - Being aware of drug side effects and discussing alternatives with a healthcare provider if needed¹⁴

Summary

Cholecystitis and pancreatitis are the inflammation of the gallbladder and pancreas, respectively. Both can manifest acutely or chronically. Acute conditions are usually sudden and severe, often caused by blockages (gallstones for cholecystitis and pancreatitis) or excessive alcohol intake (for pancreatitis). Chronic conditions result from repeated acute episodes, leading to long-term inflammation and scarring. The diagnosis involves physical examinations, blood tests, and imaging studies. Treatment ranges from medical management with medications to surgical interventions. Preventative measures include maintaining a healthy diet, regular exercise, and managing risk factors like alcohol intake and obesity.