Peritonitis

 

(Note: For PDF File Swipe To The End Of Article)

Peritonitis

Introduction to Peritonitis

Peritonitis is a serious and potentially life-threatening inflammatory condition of the peritoneum, the thin membrane that lines the inner surface of the abdominal cavity and covers most of the abdominal organs. The peritoneum plays a vital role in protecting abdominal organs, reducing friction between moving organs, and serving as a barrier against infection. When this membrane becomes inflamed, the resulting condition is known as peritonitis.

Peritonitis is considered a medical emergency because the infection or inflammation can rapidly spread throughout the abdominal cavity and into the bloodstream. If not recognized and treated promptly, it may lead to severe complications such as sepsis, septic shock, multiple organ failure, and death. The condition can affect individuals of all ages and may arise from a variety of causes, including bacterial infections, fungal infections, abdominal injuries, gastrointestinal perforations, and complications of certain medical procedures.

The severity of peritonitis depends on several factors, including the underlying cause, the extent of contamination within the abdominal cavity, the patient's immune status, and the speed with which treatment is initiated. Modern advances in diagnostic imaging, antimicrobial therapy, intensive care medicine, and surgical techniques have significantly improved patient outcomes, yet peritonitis remains a major cause of morbidity and mortality worldwide.

Understanding the causes, pathophysiology, clinical manifestations, diagnostic methods, and management strategies associated with peritonitis is essential for healthcare professionals. Early recognition and aggressive treatment are critical in preventing disease progression and reducing the risk of complications.

Definition of Peritonitis

Peritonitis is defined as inflammation of the peritoneal membrane resulting from microbial infection, chemical irritation, or physical injury. In most cases, the inflammation is caused by bacterial contamination of the normally sterile peritoneal cavity. The inflammatory response triggered by this contamination leads to increased vascular permeability, migration of immune cells, release of inflammatory mediators, and accumulation of fluid within the abdominal cavity.

The condition may be localized, where inflammation is confined to a specific area, or generalized, where the entire peritoneal cavity is involved. Generalized peritonitis is particularly dangerous because it can rapidly result in systemic inflammatory response syndrome (SIRS), septicemia, and organ dysfunction.

Clinically, peritonitis is characterized by severe abdominal pain, tenderness, guarding, rigidity, fever, nausea, vomiting, and alterations in bowel function. The diagnosis is often supported by laboratory investigations and imaging studies, while definitive treatment typically involves antimicrobial therapy and, in many cases, surgical intervention to eliminate the source of infection.

Peritonitis can develop suddenly and progress rapidly. Therefore, healthcare providers must maintain a high level of suspicion when evaluating patients with acute abdominal symptoms. Prompt diagnosis and immediate treatment are crucial to improving survival rates and minimizing complications.

Anatomy of the Peritoneum

The peritoneum is a large, continuous serous membrane that lines the abdominal cavity and covers the abdominal organs. It consists of two major layers: the parietal peritoneum and the visceral peritoneum.

The parietal peritoneum lines the internal surface of the abdominal and pelvic walls. It is supplied by somatic nerves, making it highly sensitive to pain, pressure, temperature, and touch. Pain originating from the parietal peritoneum is usually sharp and well localized.

The visceral peritoneum covers the abdominal organs, including the stomach, liver, intestines, spleen, and portions of the reproductive organs. Unlike the parietal layer, the visceral peritoneum receives autonomic nerve supply and is primarily sensitive to stretching and chemical irritation. Pain arising from the visceral peritoneum is often dull, poorly localized, and difficult for patients to pinpoint.

Between these two layers lies the peritoneal cavity, a potential space containing a small amount of lubricating fluid. This fluid allows abdominal organs to move smoothly against one another during digestion, respiration, and physical activity.

The peritoneum is highly vascular and contains an extensive network of blood vessels, lymphatics, and immune cells. These features enable it to participate actively in immune defense mechanisms and fluid exchange. However, they also facilitate the rapid spread of infection once microorganisms gain access to the peritoneal cavity.

Several anatomical structures formed by the peritoneum contribute to abdominal organization and support. These include the mesentery, greater omentum, lesser omentum, and peritoneal ligaments. The greater omentum, often referred to as the "policeman of the abdomen," has a unique ability to migrate toward sites of infection and inflammation, helping to contain and limit the spread of disease.

A thorough understanding of peritoneal anatomy is essential for appreciating how infections spread within the abdominal cavity and how surgical procedures are performed to manage peritonitis.

Functions of the Peritoneum

The peritoneum performs numerous physiological functions that are essential for maintaining abdominal health and normal organ function. One of its primary roles is lubrication. The peritoneal fluid produced by the membrane reduces friction between abdominal organs, allowing them to move freely during bodily activities such as digestion and respiration.

Another important function is mechanical support. Through structures such as the mesentery and peritoneal ligaments, the peritoneum helps suspend and stabilize abdominal organs while maintaining their proper anatomical positions.

The peritoneum also plays a significant role in immune defense. It contains macrophages, lymphocytes, and other immune cells that help identify and eliminate invading microorganisms. When infection occurs, these immune cells become activated and initiate inflammatory responses designed to contain and destroy pathogens.

Fluid transport and exchange represent another major function. The extensive network of blood vessels and lymphatic channels within the peritoneum facilitates the movement of fluids, electrolytes, proteins, and waste products between the abdominal cavity and the circulatory system. This transport system contributes to maintaining fluid balance and supports tissue nutrition.

The peritoneum additionally serves as a protective barrier against the spread of infection and injury. Under normal circumstances, it helps isolate pathological processes and prevent them from affecting neighboring organs. However, when this protective barrier is breached by perforation, trauma, or overwhelming infection, widespread peritoneal inflammation can occur.

The greater omentum, which is part of the peritoneal system, contributes significantly to this protective role. It can adhere to inflamed or perforated areas, helping to localize infection and limit contamination within the abdominal cavity.

The absorptive capacity of the peritoneum is also clinically important. This property forms the basis for peritoneal dialysis, a treatment used in patients with kidney failure. However, it can also facilitate the rapid absorption of bacteria and toxins during peritonitis, contributing to systemic infection and septic shock.

Because of these diverse functions, inflammation of the peritoneum can have profound effects on multiple physiological systems. The disruption of normal peritoneal function contributes significantly to the clinical manifestations and complications associated with peritonitis.

Epidemiology of Peritonitis

Peritonitis remains a significant global health problem and is one of the most common causes of acute abdomen requiring emergency medical and surgical intervention. The incidence of peritonitis varies according to geographical location, healthcare accessibility, socioeconomic conditions, and the prevalence of underlying diseases.

Secondary peritonitis, resulting from perforation of a hollow abdominal organ, is the most frequently encountered form. Conditions such as perforated appendicitis, perforated peptic ulcer disease, diverticulitis, intestinal obstruction, and traumatic abdominal injuries account for a substantial proportion of cases worldwide.

Primary peritonitis is less common and typically occurs in patients with underlying conditions such as liver cirrhosis, nephrotic syndrome, or ascites. The incidence of spontaneous bacterial peritonitis is particularly high among patients with advanced liver disease and portal hypertension.

The increasing use of peritoneal dialysis has contributed to a rise in cases of dialysis-associated peritonitis. Despite improvements in dialysis techniques and infection-control measures, peritonitis remains one of the most significant complications affecting patients undergoing long-term peritoneal dialysis.

Mortality rates associated with peritonitis vary widely depending on the cause, severity, patient age, comorbidities, and timeliness of treatment. While localized infections treated promptly may have favorable outcomes, generalized peritonitis complicated by sepsis and organ failure continues to carry a substantial risk of death.

Elderly individuals are particularly vulnerable due to age-related declines in immune function and the presence of multiple chronic illnesses. Similarly, immunocompromised patients, including those receiving chemotherapy, immunosuppressive therapy, or organ transplantation, face an increased risk of severe infection and poor outcomes.

The burden of peritonitis extends beyond mortality alone. Survivors may experience prolonged hospitalization, repeated surgical procedures, nutritional deficiencies, abdominal adhesions, and reduced quality of life. Consequently, prevention, early diagnosis, and effective management remain important priorities in modern healthcare.

Classification of Peritonitis

Peritonitis can be classified in several ways depending on its cause, source of infection, and clinical characteristics. The most widely accepted classification divides peritonitis into primary, secondary, and tertiary forms. Understanding these classifications is important because each type differs in its pathogenesis, microbiology, treatment approach, and prognosis.

Primary peritonitis, also known as spontaneous bacterial peritonitis, occurs without an obvious source of contamination within the abdomen. The infection usually develops when bacteria reach the peritoneal cavity through the bloodstream, lymphatic system, or translocation from the intestinal lumen. This form is most commonly seen in patients with liver cirrhosis and ascites. Because there is no surgically correctable source of infection, treatment mainly involves antimicrobial therapy and supportive care.

Secondary peritonitis is the most common form and results from contamination of the peritoneal cavity following perforation, rupture, or leakage from an abdominal organ. Conditions such as perforated appendicitis, perforated peptic ulcer, diverticular disease, bowel ischemia, traumatic injuries, and postoperative anastomotic leaks frequently cause secondary peritonitis. This form typically requires both antimicrobial treatment and surgical intervention to eliminate the source of contamination.

Tertiary peritonitis refers to persistent or recurrent intra-abdominal infection that continues despite appropriate surgical and antimicrobial management of primary or secondary peritonitis. It is often observed in critically ill patients and is associated with multidrug-resistant organisms, impaired immune function, and prolonged hospitalization. Tertiary peritonitis carries a high mortality rate due to the complexity of treatment and the severity of underlying illness.

Peritonitis may also be classified according to the extent of inflammation. Localized peritonitis involves a limited area of the peritoneum and may be contained by surrounding structures such as the omentum. Generalized peritonitis affects the entire peritoneal cavity and is associated with more severe systemic manifestations and a greater risk of complications.

Another classification is based on the nature of contamination. Bacterial peritonitis is caused by microbial infection, while chemical peritonitis results from irritation by substances such as gastric acid, bile, pancreatic enzymes, urine, or blood. Although chemical peritonitis may initially be sterile, secondary bacterial infection often develops if the underlying problem is not corrected.

Primary Peritonitis

Primary peritonitis, commonly referred to as spontaneous bacterial peritonitis (SBP), is an infection of the peritoneal cavity that occurs without an evident intra-abdominal source requiring surgical correction. It is most frequently encountered in patients with chronic liver disease and ascites, although it may also occur in individuals with nephrotic syndrome, severe malnutrition, or immunosuppressive conditions.

The pathogenesis of primary peritonitis is closely related to bacterial translocation. In patients with cirrhosis, intestinal permeability is often increased, allowing bacteria from the gastrointestinal tract to cross the intestinal wall and enter mesenteric lymph nodes. From there, microorganisms may spread into the bloodstream and eventually reach the ascitic fluid. Reduced immune defenses within the ascitic fluid further facilitate bacterial growth and infection.

The organisms most commonly responsible for spontaneous bacterial peritonitis include Escherichia coli, Klebsiella pneumoniae, and various species of Streptococcus. These bacteria are part of the normal intestinal flora but become pathogenic when they gain access to the peritoneal cavity.

Clinical manifestations may be subtle or severe. Patients often present with fever, abdominal pain, abdominal tenderness, worsening ascites, nausea, vomiting, and altered mental status. In some cases, particularly among elderly patients, confusion or hepatic encephalopathy may be the first sign of infection.

Diagnosis is primarily based on analysis of ascitic fluid obtained through paracentesis. An elevated neutrophil count in the fluid strongly suggests spontaneous bacterial peritonitis, even if bacterial cultures are negative. Early diagnosis is essential because delayed treatment significantly increases the risk of sepsis and death.

Treatment consists mainly of broad-spectrum antibiotics directed against enteric bacteria. Third-generation cephalosporins are commonly used as initial therapy. Intravenous albumin may also be administered to reduce the risk of renal failure, which is a serious complication of spontaneous bacterial peritonitis.

Patients who recover from an episode of spontaneous bacterial peritonitis remain at high risk for recurrence. Consequently, many require long-term antibiotic prophylaxis and careful monitoring to prevent future infections.

Secondary Peritonitis

Secondary peritonitis is the most common and clinically significant form of peritonitis. It develops when microorganisms enter the peritoneal cavity through a breach in the integrity of the gastrointestinal, biliary, urinary, or reproductive tract. This contamination triggers a vigorous inflammatory response that can rapidly progress to systemic infection if not treated promptly.

The causes of secondary peritonitis are numerous. Gastrointestinal perforation is one of the most frequent mechanisms. A perforated appendix, perforated gastric ulcer, perforated duodenal ulcer, perforated diverticulum, or perforated colon can release bacteria, digestive enzymes, and intestinal contents directly into the abdominal cavity. Similarly, traumatic injuries to abdominal organs may result in contamination and inflammation.

When bacteria enter the peritoneal cavity, immune cells are rapidly activated. Neutrophils migrate to the site of infection and release inflammatory mediators that increase vascular permeability and recruit additional immune cells. While these responses are intended to eliminate infection, excessive inflammation may cause widespread tissue damage and fluid loss.

Secondary peritonitis typically presents with severe abdominal pain that becomes progressively worse over time. Patients often experience fever, nausea, vomiting, abdominal distension, and inability to pass stool or gas. Physical examination commonly reveals guarding, rigidity, rebound tenderness, and signs of generalized abdominal inflammation.

As the infection progresses, systemic manifestations become increasingly prominent. Tachycardia, hypotension, tachypnea, and altered mental status may indicate the development of sepsis. Without timely intervention, septic shock and multiple organ dysfunction can occur.

Management requires a combination of aggressive fluid resuscitation, broad-spectrum antimicrobial therapy, correction of electrolyte abnormalities, and surgical source control. Surgery aims to repair the perforation, remove infected tissue, drain abscesses, and eliminate ongoing contamination. Successful source control is often the most important determinant of patient outcome.

Despite advances in critical care and surgical techniques, secondary peritonitis continues to be associated with significant morbidity and mortality, particularly among elderly patients and those with delayed presentation.

Tertiary Peritonitis

Tertiary peritonitis represents a persistent or recurrent intra-abdominal infection that develops after apparently adequate treatment of primary or secondary peritonitis. It is generally considered one of the most challenging forms of intra-abdominal infection due to its complex pathophysiology and poor prognosis.

Unlike secondary peritonitis, tertiary peritonitis often occurs in critically ill patients who have already undergone surgery and received extensive antimicrobial therapy. The infection may persist because of impaired host immunity, ongoing inflammatory responses, inadequate source control, or colonization by resistant microorganisms.

Patients with tertiary peritonitis frequently have prolonged stays in intensive care units and may require multiple surgical procedures. Common risk factors include severe trauma, major abdominal surgery, prolonged mechanical ventilation, immunosuppression, malnutrition, and previous exposure to broad-spectrum antibiotics.

The microbiology of tertiary peritonitis differs from that of primary and secondary forms. Opportunistic organisms, including Enterococcus species, Candida species, coagulase-negative staphylococci, and multidrug-resistant gram-negative bacteria, are commonly isolated. These pathogens often exhibit resistance to standard antimicrobial regimens, complicating treatment.

Clinical manifestations may be less dramatic than those observed in acute secondary peritonitis. Instead of severe abdominal pain and rigidity, patients may present with persistent fever, ongoing organ dysfunction, failure to improve clinically, elevated inflammatory markers, and recurrent intra-abdominal fluid collections.

Diagnosis often requires repeated imaging studies, microbiological investigations, and careful clinical assessment. Computed tomography plays an important role in identifying persistent abscesses, fluid collections, and other complications requiring intervention.

Treatment involves repeated efforts to achieve adequate source control, optimization of nutritional status, correction of immune dysfunction when possible, and administration of targeted antimicrobial therapy based on culture results. Intensive supportive care is frequently required due to the high incidence of organ failure.

Mortality rates associated with tertiary peritonitis remain high despite modern treatment approaches. Therefore, prevention through early recognition and effective management of primary and secondary peritonitis is of paramount importance.

Causes of Peritonitis

Peritonitis can arise from numerous infectious and noninfectious causes. Understanding these causes is essential because successful treatment depends on identifying and correcting the underlying source of inflammation.

The most common causes involve perforation of hollow abdominal organs. When a perforation occurs, bacteria, digestive enzymes, bile, food particles, and other contaminants escape into the normally sterile peritoneal cavity. This contamination initiates a severe inflammatory response that can rapidly become life-threatening.

Perforated appendicitis is among the leading causes of secondary peritonitis worldwide. If acute appendicitis is not treated promptly, the inflamed appendix may rupture, releasing infected material into the abdominal cavity. Similarly, perforated peptic ulcers allow gastric or duodenal contents to enter the peritoneal space, producing both chemical and bacterial inflammation.

Diverticulitis, particularly when complicated by perforation, represents another major cause. Inflammation of colonic diverticula may progress to abscess formation and eventual rupture, leading to widespread contamination of the abdomen.

Intestinal obstruction can also result in peritonitis. When blood supply to the bowel becomes compromised, ischemia and necrosis may develop. Necrotic bowel tissue eventually perforates, allowing intestinal bacteria to spread throughout the peritoneal cavity.

Traumatic injuries to the abdomen, whether blunt or penetrating, frequently cause peritoneal contamination. Stab wounds, gunshot injuries, motor vehicle accidents, and industrial accidents may damage abdominal organs and create pathways for infection.

Postoperative complications represent another important cause. Leakage from surgical anastomoses, inadvertent bowel injury, and postoperative abscess formation can all lead to peritonitis. Such complications often require urgent reoperation and intensive medical management.

In addition to infectious causes, chemical irritation may trigger peritoneal inflammation. Leakage of bile, pancreatic enzymes, urine, or blood into the peritoneal cavity can produce significant irritation even in the absence of bacterial infection. Over time, secondary bacterial contamination may occur, further worsening the condition.

Risk Factors for Peritonitis

Several factors increase an individual's susceptibility to developing peritonitis. These risk factors may predispose patients to infection, facilitate bacterial spread within the abdominal cavity, or impair the body's ability to respond effectively to contamination.

One of the most significant risk factors is liver cirrhosis with ascites. Patients with advanced liver disease often have impaired immune function, decreased complement activity, and reduced antibacterial defenses within ascitic fluid. These abnormalities make spontaneous bacterial peritonitis a common and serious complication.

Peritoneal dialysis is another important risk factor. Although this treatment is highly effective for patients with end-stage renal disease, repeated access to the peritoneal cavity creates opportunities for microorganisms to enter and cause infection. Inadequate sterile technique during dialysis exchanges further increases the risk.

Advanced age is associated with a greater likelihood of developing peritonitis and experiencing poor outcomes. Elderly individuals frequently have reduced immune function, multiple chronic diseases, delayed symptom recognition, and decreased physiological reserve, all of which contribute to increased vulnerability.

Diabetes mellitus significantly increases the risk of infection due to impaired neutrophil function, reduced blood flow to tissues, and compromised wound healing. Diabetic patients are therefore more susceptible to severe intra-abdominal infections and postoperative complications.

Immunosuppressive conditions also play a major role. Patients receiving chemotherapy, corticosteroids, immunosuppressive medications, or organ transplantation are less capable of mounting effective immune responses against invading pathogens. Human immunodeficiency virus (HIV) infection similarly increases susceptibility to opportunistic infections involving the peritoneal cavity.

Malnutrition weakens host defenses and impairs tissue repair mechanisms. Protein deficiency, vitamin deficiencies, and chronic illness can reduce the body's ability to contain and eliminate infection once contamination occurs.

Previous abdominal surgery is another recognized risk factor. Surgical procedures may result in adhesions, bowel injury, anastomotic leaks, or postoperative abscess formation, all of which can contribute to the development of peritonitis.

Gastrointestinal diseases such as appendicitis, diverticulitis, inflammatory bowel disease, peptic ulcer disease, and colorectal cancer may increase the likelihood of perforation and subsequent peritoneal contamination. Trauma, whether accidental or intentional, further elevates risk by directly damaging abdominal organs.

Understanding these risk factors helps healthcare professionals identify high-risk patients, implement preventive measures, and maintain vigilance for early signs of infection.

Pathophysiology of Peritonitis

The pathophysiology of peritonitis involves a complex series of inflammatory and immunological events that occur when the peritoneal cavity becomes contaminated by microorganisms, chemical irritants, or foreign material. Although the initial trigger may vary, the subsequent inflammatory response follows a relatively predictable pattern.

When bacteria or other irritants enter the peritoneal cavity, resident macrophages and mesothelial cells recognize the threat and release inflammatory mediators. These mediators include cytokines such as tumor necrosis factor-alpha, interleukin-1, and interleukin-6. Their release initiates a cascade of immune responses designed to eliminate infection and repair tissue damage.

One of the earliest effects is vasodilation of peritoneal blood vessels. Increased blood flow brings immune cells and plasma proteins to the site of infection. At the same time, vascular permeability increases, allowing fluid, antibodies, and inflammatory cells to leave the circulation and enter the peritoneal cavity.

Neutrophils rapidly migrate to the affected area and begin attacking invading microorganisms. While this response is essential for controlling infection, it also contributes to tissue injury through the release of enzymes, reactive oxygen species, and inflammatory substances.

As inflammation progresses, large amounts of fluid accumulate within the peritoneal cavity. This process, known as third spacing, can result in significant intravascular volume depletion. Patients may therefore develop hypotension, tachycardia, reduced organ perfusion, and shock despite having substantial amounts of fluid within the abdomen.

The intestines respond to inflammation by becoming edematous and hypomotile. Paralytic ileus commonly develops, leading to abdominal distension, nausea, vomiting, and absence of bowel sounds. Intestinal dysfunction further contributes to bacterial translocation and worsening infection.

The greater omentum attempts to contain the infection by migrating toward inflamed areas and adhering to sites of contamination. In some cases, this process successfully localizes infection and leads to abscess formation rather than generalized peritonitis.

If the inflammatory response becomes overwhelming, systemic inflammatory response syndrome develops. Large quantities of cytokines enter the bloodstream, producing fever, tachycardia, tachypnea, and leukocytosis. Continued progression may result in sepsis, septic shock, disseminated intravascular coagulation, and multiple organ dysfunction syndrome.

Without effective treatment, widespread tissue injury, circulatory collapse, and organ failure ultimately lead to death. This explains why rapid diagnosis and early intervention are crucial in the management of peritonitis.

Etiology of Peritonitis

The etiology of peritonitis encompasses a wide variety of infectious and noninfectious factors. Although bacterial infection remains the most common cause, numerous pathological processes can initiate inflammation of the peritoneal membrane.

Bacterial infections account for the majority of cases. These infections may originate from the gastrointestinal tract, biliary system, urinary tract, reproductive organs, or external sources such as trauma and surgery. The specific microorganisms involved depend on the underlying cause and location of contamination.

Gram-negative enteric bacteria are frequently responsible because they normally inhabit the intestinal tract. Escherichia coli, Klebsiella species, Enterobacter species, and Proteus species are commonly isolated in cases of secondary peritonitis. Anaerobic organisms such as Bacteroides fragilis also play an important role, particularly in infections involving the colon.

Gram-positive bacteria, including Streptococcus species and Enterococcus species, may contribute to both primary and secondary peritonitis. In patients undergoing peritoneal dialysis, skin organisms such as Staphylococcus epidermidis and Staphylococcus aureus are common pathogens.

Fungal peritonitis is less common but can occur in immunocompromised individuals, critically ill patients, and those receiving prolonged antibiotic therapy. Candida species are the most frequently identified fungal pathogens and are associated with particularly severe disease.

Chemical irritation may also cause peritonitis. Leakage of gastric acid from a perforated ulcer, bile from a ruptured gallbladder, pancreatic enzymes from acute pancreatitis, urine from urinary tract injuries, and blood from intra-abdominal hemorrhage can all produce significant inflammation. Although initially sterile, these conditions often become secondarily infected if left untreated.

Foreign materials within the peritoneal cavity may provoke inflammatory reactions as well. Examples include surgical sponges, talc, starch particles from surgical gloves, and other contaminants introduced during medical procedures.

The specific etiology of peritonitis greatly influences clinical presentation, microbiological findings, treatment strategies, and patient outcomes. Therefore, identifying the underlying cause is a critical component of effective management.

Sources of Infection

The peritoneal cavity may become infected through several distinct pathways. Understanding these sources helps clinicians determine the likely causative organisms and select appropriate therapeutic interventions.

The gastrointestinal tract is by far the most common source of infection. Perforations involving the stomach, small intestine, appendix, or colon release large numbers of bacteria into the peritoneal cavity. Because the colon contains the highest concentration of microorganisms, colonic perforations are often associated with particularly severe infections.

Appendiceal perforation represents a frequent source of contamination, especially among younger patients. When acute appendicitis progresses untreated, rupture may occur, allowing infected contents to spread throughout the abdomen.

Perforated peptic ulcers permit leakage of acidic gastric contents and bacteria into the peritoneal cavity. Initially, chemical irritation predominates, but bacterial infection rapidly develops as gastrointestinal microorganisms multiply.

Diverticular disease is another important source. Inflamed diverticula may rupture, producing localized abscesses or generalized peritonitis depending on the extent of contamination and the effectiveness of the body's containment mechanisms.

The biliary tract can also serve as a source of infection. Gallbladder perforation, bile duct injuries, and severe cholecystitis may result in bile leakage and subsequent bacterial contamination. Bile itself is highly irritating to the peritoneum and contributes to intense inflammation.

The female reproductive tract provides another potential route for infection. Pelvic inflammatory disease, ruptured tubo-ovarian abscesses, and postpartum infections can extend into the peritoneal cavity and cause pelvic or generalized peritonitis.

Urinary tract injuries and bladder rupture occasionally result in urinary peritonitis. Although urine may initially be sterile, prolonged exposure promotes inflammation and secondary infection.

Traumatic injuries constitute an important source of contamination. Penetrating wounds frequently introduce bacteria directly into the abdominal cavity, while blunt trauma may cause delayed perforation of hollow organs.

Healthcare-associated infections are increasingly recognized. Postoperative leaks, infected surgical sites, and complications of invasive procedures contribute substantially to modern cases of peritonitis. These infections often involve resistant microorganisms and require specialized treatment strategies.

Clinical Manifestations of Peritonitis

The clinical manifestations of peritonitis vary depending on the cause, severity, extent of inflammation, and overall health status of the patient. However, certain symptoms and signs are characteristic and frequently observed across different forms of the disease.

Abdominal pain is usually the earliest and most prominent symptom. The pain often begins suddenly and intensifies progressively over time. Patients typically describe it as severe, constant, and aggravated by movement, coughing, or deep breathing. As inflammation spreads, pain may become generalized throughout the abdomen.

Tenderness on abdominal examination is a hallmark finding. Even gentle palpation may produce significant discomfort. In advanced cases, involuntary muscle contraction known as guarding develops as the abdominal wall attempts to protect inflamed structures beneath it.

Fever is another common manifestation and reflects the body's systemic response to infection. Elevated body temperature may be accompanied by chills, sweating, and malaise. However, elderly and immunocompromised patients may exhibit minimal fever despite severe infection.

Nausea and vomiting frequently occur due to intestinal irritation and paralytic ileus. Persistent vomiting can contribute to dehydration, electrolyte disturbances, and worsening hemodynamic instability.

Abdominal distension often develops as bowel motility decreases. Gas and fluid accumulate within the intestines, producing visible enlargement of the abdomen and discomfort.

Changes in bowel habits are common. Some patients experience constipation and inability to pass flatus, while others develop diarrhea depending on the underlying cause. Reduced bowel sounds are frequently noted during physical examination.

Systemic manifestations become increasingly prominent as infection progresses. Tachycardia, hypotension, tachypnea, and reduced urine output may indicate evolving sepsis. Patients often appear acutely ill, anxious, and distressed.

In severe cases, mental status changes such as confusion, agitation, lethargy, or decreased consciousness may occur. These findings often reflect systemic infection, poor tissue perfusion, or metabolic abnormalities and require immediate medical attention.

The severity of clinical manifestations generally correlates with the extent of peritoneal involvement. Generalized peritonitis tends to produce more dramatic symptoms and carries a significantly greater risk of life-threatening complications than localized disease.