[Differential diagnosis of fever]

Eugeniusz Józef Kucharz1

  • 1Katedra i Klinika Chorób Wewnetrznych i Reumatologii Slaskiego Uniwersytetu Medycznego w Katowicach ul. Ziołowa 45/47, 40-635 Katowice.

Insights

Persistent fever, or fever of unknown origin, presents a diagnostic challenge when its cause isn't readily apparent. Understanding fever classification and clinical courses is crucial for diagnosis.

Area of Science:

  • Clinical Medicine
  • Pathophysiology
  • Immunology

Context:

  • Fever is a common clinical symptom with diverse underlying causes.
  • Prolonged fever without an obvious source poses a significant clinical challenge.
  • Accurate diagnosis is essential for effective patient management.

Purpose:

  • To classify the potential causes of fever.
  • To describe the clinical variations in fever presentation.
  • To define fever of unknown origin (FUO).

Summary:

  • Fever causes are broadly categorized into infectious agents, neoplasms, immune/metabolic disorders, and genetic inflammasome abnormalities.
  • Fever's clinical course can manifest continuously, intermittently, or remittently.
  • When the etiology remains elusive despite investigation, a diagnosis of fever of unknown origin is made.

Impact:

  • Provides a structured approach to diagnosing complex fever cases.
  • Highlights the importance of considering a wide range of differential diagnoses.
  • Facilitates better clinical decision-making for patients with prolonged fever.

Related Concept Videos

Types of Fever01:25

Types of Fever

Fever can be triggered by several factors, including infections, nervous system disorders, certain cancers, blood diseases like leukemia, embolism, thrombosis, heatstroke, dehydration, surgical trauma, crushing injuries, and allergic reactions.
Here are the different types of fever:
Patterns of Fever01:26

Patterns of Fever

Before understanding the types and patterns of fever, it is essential to know its phases.
Increased Body Temperature01:25

Increased Body Temperature

A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in response to an infection or illness.
Methods of reducing fever01:22

Methods of reducing fever

The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
Pharmacological Methods of Reducing Fever:
Factors Affecting Body Temperature01:28

Factors Affecting Body Temperature

As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
Factors may  include:
Viral Meningitis01:18

Viral Meningitis

Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...