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01:10Nephrons
7.1K
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...
7.1K
01:30Spare Receptors
4.6K
Some receptors remain unoccupied even when an agonist produces a maximal response. Such empty ones are called spare receptors. In presence of spare receptors the maximum effect of an agonist drug is achieved with fewer than 100% of the receptors being occupied. To determine the presence of spare receptors, scientists often compare the concentration of the drug needed to produce 50% of the maximum effect (EC50) with the concentration of the drug needed to occupy 50% of the receptors (Kd). If the...
4.6K
01:28Antihypertensive Drugs: Potassium-Sparing Diuretics
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Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
2.3K
01:12Types of Errors: Detection and Minimization
11.4K
Error is the deviation of the obtained result from the true, expected value or the estimated central value. Errors are expressed in absolute or relative terms.
Absolute error in a measurement is the numerical difference from the true or central value. Relative error is the ratio between absolute error and the true or central value, expressed as a percentage.
Errors can be classified by source, magnitude, and sign. There are three types of errors: systematic, random, and gross.
Systematic or...
Absolute error in a measurement is the numerical difference from the true or central value. Relative error is the ratio between absolute error and the true or central value, expressed as a percentage.
Errors can be classified by source, magnitude, and sign. There are three types of errors: systematic, random, and gross.
Systematic or...
11.4K
01:23Mechanical Ventilation II: Invasive Ventilation
781
Ventilators are essential medical equipment used to aid patients with respiratory difficulties. Their primary function is to assist or replace spontaneous breathing by providing mechanical ventilation. There are two general classes of mechanical ventilators: negative-pressure and positive-pressure ventilators.
Negative-Pressure Ventilators
Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
Negative-Pressure Ventilators
Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
781
01:33Hormonal Regulation
36.1K
The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
36.1K
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Electromagnetic Navigation Transthoracic Nodule Localization for Minimally Invasive Thoracic Surgery
Published on: May 4, 2022
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Minimally invasive nephron-sparing surgery.
1Section of Laparoscopic and Minimally Invasive Surgery, Cleveland Clinic Urological Institute, and The Minimally Invasive Surgery Center, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH 44195, USA. gilli@ccf.org
The Urologic Clinics of North America
|September 5, 2003
Summary
Open partial nephrectomy remains the gold standard for kidney cancer. Minimally invasive options like laparoscopic partial nephrectomy and cryotherapy show promise, while radiofrequency ablation and high-intensity focused ultrasound require further research.
Area of Science:
- Urology
- Surgical Oncology
- Minimally Invasive Surgery
Background:
- Open partial nephrectomy is the established gold standard for nephron-sparing cancer treatment.
- Minimally invasive nephron-sparing alternatives are evolving and categorized into excision, probe ablation, and noninvasive ablation.
- Laparoscopic partial nephrectomy currently has the most clinical relevance by emulating open techniques.
Purpose of the Study:
- To review and compare evolving minimally invasive nephron-sparing surgical options for kidney cancer.
- To present an algorithm for the indications of these alternative surgical approaches.
- To assess the current status and future potential of various nephron-sparing techniques.
Main Methods:
- Review of current literature and established oncologic follow-up data.
- Categorization of minimally invasive techniques: laparoscopic partial nephrectomy, cryotherapy, radiofrequency ablation, and high-intensity focused ultrasound.
- Discussion of clinical application, efficacy, and limitations of each method.
Main Results:
- Laparoscopic partial nephrectomy demonstrates immediate clinical applicability and relevance.
- Renal cryotherapy shows emerging evidence of efficacy and reproducibility, with future follow-up data anticipated.
- Renal radiofrequency ablation faces challenges in ensuring complete cancer cell kill and reliable monitoring.
- High-intensity focused ultrasound represents a noninvasive technology with significant future potential.
Conclusions:
- Laparoscopic partial nephrectomy is the leading minimally invasive nephron-sparing alternative to open surgery.
- Renal cryotherapy is a promising option, pending further long-term data.
- Radiofrequency ablation and high-intensity focused ultrasound require further investigation and technological advancement for widespread clinical adoption.