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Related Concept Videos

Acute Pyelonephritis II: Diagnostic Studies and Management01:28

Acute Pyelonephritis II: Diagnostic Studies and Management

Introduction:For diagnosing acute pyelonephritis, a comprehensive patient history is collected to identify symptoms such as dysuria, frequent or urgent urination, flank pain, or costovertebral angle (CVA) tenderness that may suggest a kidney infection.Physical ExaminationDuring the physical examination, CVA tenderness is assessed. This involves gentle percussion over the costovertebral angle, where tenderness often indicates a kidney infection.Diagnostic TestsUrinalysis: Used to identify white...
Endocarditis III: Medical Management01:18

Endocarditis III: Medical Management

Infective endocarditis management involves a multifaceted approach encompassing infection prevention, lifestyle modifications, pharmacological therapy, and surgical management.Infection Prevention:Hand Hygiene: Thorough handwashing is crucial to prevent the spread of infection. Hand hygiene should be performed regularly, especially before and after using the restroom.Oral Hygiene: Good oral hygiene is essential. It includes brushing teeth immediately after waking up and before bed, flossing...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
Bacterial Meningitis I: Introduction01:22

Bacterial Meningitis I: Introduction

Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
Acute Pyelonephritis I: Introduction01:27

Acute Pyelonephritis I: Introduction

Pyelonephritis is a bacterial infection that primarily affects the renal parenchyma and collecting system, including the renal pelvis, tubules, and interstitial tissue of one or both kidneys. It can be classified as either acute—a sudden, severe infection—or chronic, which refers to long-term or recurrent kidney infections.The primary cause of acute pyelonephritis (APN) is bacterial infection, with Escherichia coli accounting for approximately 70-80% of cases. Other bacteria, such as Proteus,...
Endocarditis I: Introduction01:25

Endocarditis I: Introduction

Introduction:Endocarditis is the infection of the endocardium, the inner lining of the heart and its valves. When the heart muscle is involved, the condition is termed myocarditis, while an infection of the outer lining is called pericarditis. Infective endocarditis (IE) primarily affects the endocardium, where pathogens adhere to the valves or lining, forming vegetation that can lead to severe complications. Infective endocarditis occurs when microorganisms, usually bacteria from other body...

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Related Experiment Video

Updated: May 29, 2026

Knee Arthrocentesis in Adults
04:41

Knee Arthrocentesis in Adults

Published on: February 25, 2022

Approach to septic arthritis.

Diane Lewis Horowitz1, Elena Katzap, Scott Horowitz

  • 1North Shore-Long Island Jewish Health System, Manhasset, NY, USA.

American Family Physician
|September 16, 2011
PubMed
Summary

Prompt diagnosis of septic arthritis is crucial to prevent severe outcomes. Early identification relies on joint symptoms and synovial fluid analysis, guiding effective antibiotic treatment.

Area of Science:

  • Infectious Diseases
  • Rheumatology
  • Microbiology

Background:

  • Infectious arthritis, particularly septic arthritis, poses significant risks of morbidity and mortality if not promptly diagnosed and treated.
  • Acute monoarticular joint pain, erythema, heat, and immobility are key indicators, though constitutional symptoms like fever are unreliable.
  • Distinguishing septic arthritis from crystal arthropathy is vital, though they can co-occur.

Purpose of the Study:

  • To outline diagnostic criteria for septic arthritis.
  • To guide initial antibiotic selection based on Gram stain results.
  • To emphasize the importance of synovial fluid analysis and joint fluid evacuation.

Main Methods:

  • Analysis of synovial fluid white blood cell count (typically >50,000/mm³ in non-prosthetic joints).

Related Experiment Videos

Last Updated: May 29, 2026

Knee Arthrocentesis in Adults
04:41

Knee Arthrocentesis in Adults

Published on: February 25, 2022

  • Synovial fluid culture for definitive pathogen identification.
  • Gram stain of synovial fluid to guide empirical antibiotic therapy.

    • Main Results:

    • Staphylococcus species are the most common cause of nongonococcal septic arthritis (>80%).
    • Gram stain results inform initial antibiotic choices: vancomycin for Gram-positive cocci, ceftriaxone for Gram-negative cocci, ceftazidime for Gram-negative rods.
    • In cases of strong clinical suspicion with negative Gram stain, vancomycin plus ceftazidime or an aminoglycoside is recommended.

    Conclusions:

    • Prompt diagnosis and treatment, including synovial fluid analysis and appropriate antibiotic therapy, are essential for managing septic arthritis.
    • Surgical or arthrocentesis evacuation of purulent material is necessary.
    • Prosthetic joint infections require special consideration with lower synovial fluid white blood cell count thresholds (e.g., 1,100/mm³ with >64% neutrophils).