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Related Concept Videos

Nephrotic Syndrome I : Introduction01:24

Nephrotic Syndrome I : Introduction

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Nephrotic Syndrome is a chronic kidney disorder defined by clinical findings such as severe proteinuria, hypoalbuminemia, hyperlipidemia, and edema. These symptoms result from damage to the glomeruli, the kidney’s filtering units, increasing their permeability to proteins.Definition and Meaning:Proteinuria, defined as the loss of more than 3.5 grams of protein per day in adults, is a crucial feature of nephrotic syndrome. This condition is often accompanied by edema, the accumulation of...
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Glomerular Filtration01:15

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The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
Components of the Filtration Membrane
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The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
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Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma...
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The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
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Related Experiment Video

Updated: Jan 10, 2026

Nephrotic Syndrome I : Introduction
01:24

Nephrotic Syndrome I : Introduction

Published on: June 19, 2025

476

Chlamydial endocarditis: a report on ten cases.

J Etienne1, D Ory, D Thouvenot

  • 1Laboratoire de Microbiologie, Hôpital Louis Pradel, Lyon, France.

European Heart Journal
|October 1, 1992
PubMed
Summary

Chlamydia infection caused infective native-valve endocarditis in 10 men between 1983-1990. Diagnosis was challenging due to negative blood cultures and non-specific symptoms, requiring valve replacement in all cases.

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Area of Science:

  • Infectious Diseases
  • Cardiology
  • Microbiology

Background:

  • Infective native-valve endocarditis (INVE) is a serious condition often caused by bacteria.
  • Chlamydia species, particularly Chlamydia psittaci, are known zoonotic pathogens that can cause endocarditis.

Purpose of the Study:

  • To describe the clinical, echocardiographic, and microbiological features of Chlamydia-induced INVE.
  • To highlight diagnostic challenges and outcomes in these patients.

Main Methods:

  • Retrospective case series of 10 patients diagnosed with Chlamydia endocarditis between 1983-1990.
  • Clinical data, echocardiography, serological testing (complement fixation, micro-immunofluorescence), and valve histology were analyzed.

Main Results:

  • All 10 patients were men with a mean age of 42; symptoms persisted for over 2 months.
  • Aortic valve involvement was most common (7/10); echocardiography showed fingerlike vegetations in 9/10.
  • Blood cultures were negative; serology confirmed Chlamydia infection in most cases; valve replacement was required for all patients, with 3 deaths within a year.

Conclusions:

  • Chlamydia can cause INVE, presenting with prolonged symptoms and negative blood cultures, posing diagnostic difficulties.
  • Early diagnosis and intervention, including valve replacement, are crucial for managing Chlamydia endocarditis.
  • Histological and immunofluorescence staining are vital for confirming Chlamydia in valve tissue when cultures are negative.