Waterhouse–Friderichsen syndrome

Waterhouse–Friderichsen syndrome
Name	Waterhouse–Friderichsen syndrome
Synonyms	Hemorrhagic adrenalitis, Fulminant meningococcemia
Symptoms	Sudden fever, petechial rash, shock, cyanosis
Complications	Disseminated intravascular coagulation, Adrenal insufficiency, Multiple organ dysfunction syndrome
Onset	Abrupt, over hours
Causes	Severe bacterial infection, most commonly Neisseria meningitidis
Risks	Asplenia, Complement deficiency, Properdin deficiency
Diagnosis	Clinical presentation, blood culture, lumbar puncture
Treatment	Immediate empiric antibiotic therapy, corticosteroid replacement, intensive care unit support
Prognosis	Poor without rapid treatment; high mortality
Frequency	Rare

Waterhouse–Friderichsen syndrome is a rare, catastrophic condition characterized by acute adrenal gland hemorrhage leading to profound adrenal insufficiency and septic shock. It is most frequently a complication of overwhelming bacterial sepsis, particularly from Neisseria meningitidis, the causative agent of meningococcal disease. The syndrome progresses with devastating speed, often culminating in disseminated intravascular coagulation and multiple organ failure within hours. Its name derives from the physicians Rupert Waterhouse and Carl Friderichsen, who provided early clinical descriptions of the condition.

Signs and symptoms

The onset is abrupt, with patients rapidly developing high fever, chills, vomiting, and severe headache. A characteristic petechial rash or purpura fulminans often appears on the trunk and lower extremities. This progresses swiftly to hypotension, tachycardia, and signs of shock, including cyanosis and altered mental status. Abdominal pain and back pain may signal adrenal hemorrhage. Without intervention, patients deteriorate into coma and cardiopulmonary arrest.

Causes and pathophysiology

The primary cause is fulminant bacterial infection, with Neisseria meningitidis (serogroup B and serogroup C) responsible for the majority of cases. Other pathogens include Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus, and Pseudomonas aeruginosa. The pathophysiology involves direct bacterial endotoxin release, triggering a massive systemic inflammatory response syndrome. This causes endothelial damage, vascular necrosis, and bilateral adrenal hemorrhage, destroying the adrenal cortex and adrenal medulla. Underlying risk factors such as asplenia, complement deficiency (e.g., C5-C9), or properdin deficiency increase susceptibility.

Diagnosis

Diagnosis is primarily clinical, based on the rapid progression of septic shock with a characteristic hemorrhagic rash. Key laboratory findings include leukocytosis or leukopenia, thrombocytopenia, and markers of disseminated intravascular coagulation like elevated D-dimer and prolonged prothrombin time. Confirmation involves isolating the pathogen via blood culture or cerebrospinal fluid analysis from a lumbar puncture. Imaging with computed tomography of the abdomen may reveal enlarged, hemorrhagic adrenal glands. Adrenocorticotropic hormone stimulation testing can confirm adrenal insufficiency.

Treatment

Treatment is a medical emergency requiring immediate management in an intensive care unit. Empiric, broad-spectrum intravenous antibiotic therapy, such as ceftriaxone or penicillin G, must be initiated without delay. Corticosteroid replacement with hydrocortisone is critical to address the acute adrenal crisis. Aggressive fluid resuscitation and vasopressor support (e.g., norepinephrine) are needed for septic shock. Management of complications includes fresh frozen plasma for coagulopathy and possibly activated protein C. Close monitoring for acute respiratory distress syndrome and renal failure is essential.

Prognosis

The prognosis is historically very poor, with mortality rates exceeding 50-60% even with modern treatment. Survival hinges on the speed of diagnosis and the immediate initiation of antibiotic therapy and hemodynamic support. Patients who survive the acute phase may have long-term adrenal insufficiency, requiring lifelong glucocorticoid and mineralocorticoid replacement. Neurological sequelae from meningitis or cerebral infarction can occur. Outcomes are worse in cases caused by Streptococcus pneumoniae or with delays in intensive care unit admission.

Epidemiology

The syndrome is rare, occurring most often in children under two years of age and in young adults, mirroring the epidemiology of invasive meningococcal disease. Sporadic cases and outbreaks are reported globally, with higher incidence in the "meningitis belt" of sub-Saharan Africa. The introduction of conjugate vaccines against Neisseria meningitidis (e.g., MenACWY vaccine), Haemophilus influenzae type b, and Streptococcus pneumoniae has reduced the incidence of predisposing infections. Cases associated with Staphylococcus aureus are often seen in the context of endocarditis or in immunocompromised hosts.

Category:Medical emergencies Category:Endocrinology Category:Infectious diseases