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Related Concept Videos

Minor Losses in Pipes01:25

Minor Losses in Pipes

In pipe systems, minor losses refer to energy losses arising from components such as valves, bends, fittings, expansions, and other features that disrupt the steady flow of fluid. These disturbances cause energy dissipation through turbulence and resistance, which engineers quantify to manage system efficiency effectively.
Valves play a significant role in generating minor losses by obstructing or redirecting the fluid flow. When a valve is closed or partially closed, it restricts the flow...
Tracheostomy Care I: Pre-procedural Steps01:16

Tracheostomy Care I: Pre-procedural Steps

A tracheostomy is a surgical technique that involves making an incision in the neck to provide access to the trachea. It is frequently used in medical conditions such as airway obstruction and prolonged mechanical ventilation. Effective nursing management is crucial for the long-term success of a tracheostomy.
Required Equipment
The equipment necessary for tracheostomy care includes:
Tracheostomy Care II: Procedure01:25

Tracheostomy Care II: Procedure

Tracheostomy care is an essential nursing skill that involves cleaning and maintaining a tracheostomy tube to prevent infection and other complications. Here's a step-by-step guide explaining each procedure with its rationale. Note that disposable gloves are to be worn at all times and changed as often as needed to maintain a sterile work environment, and to protect both patient and healthcare worker.
Step 1: Perform hand hygiene, and put on personal protective equipment: gown, gloves, mask and...
Tracheostomy: Procedure and Tubes01:28

Tracheostomy: Procedure and Tubes

A tracheostomy is a surgical procedure that creates an artificial opening into the trachea, typically at the second or third cartilaginous ring level. This opening allows the insertion of a tracheostomy tube, which can replace an endotracheal tube, provide mechanical ventilation, bypass an upper airway obstruction, or remove accumulated tracheobronchial secretions.
Tracheostomy tubes can be made of semiflexible plastic (polyurethane or silicone), rigid plastic, or metal, and they come in...
Major Losses in Pipes01:28

Major Losses in Pipes

When a fluid flows through a pipe, it experiences energy losses due to frictional resistance along the pipe walls, known as major losses. These energy losses result in a pressure drop, which varies based on the flow conditions — whether laminar or turbulent — and the specific physical properties of the fluid and pipe.
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
Heart Valves01:16

Heart Valves

The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...

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How to Build a Vacuum Spring-transport Package for Spinning Rotor Gauges
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[Knack and pitfall in valve replacement].

T Takano1, J Amano

  • 1Department of Cardiovascular Surgery, Shinshu University School of Medicine, Matsumoto, Japan.

Kyobu Geka. the Japanese Journal of Thoracic Surgery
|August 19, 2010
PubMed
Summary
This summary is machine-generated.

This study highlights key surgical techniques for heart valve replacement, emphasizing careful calcification removal and leaflet preservation. Intraoperative echocardiography aids in detecting complications, with low mortality and re-operation rates observed in 53 cases.

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Last Updated: Jun 10, 2026

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Standardized Technique of Aortic Valve Re-implantation for Valve-sparing Aortic Root Replacement
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Area of Science:

  • Cardiovascular Surgery
  • Cardiac Valve Repair and Replacement
  • Surgical Echocardiography

Context:

  • Adherence to American Heart Association/American College of Cardiology guidelines is crucial for selecting prosthetic or bioprosthetic valves.
  • Preserving the native valve annulus during aortic valve replacement requires meticulous removal of calcification, avoiding over-resection.
  • Mitral valve replacement in cases of a large mitral annulus involves preserving the posterior leaflet and basal chordae.

Purpose:

  • To detail critical surgical considerations and techniques in heart valve replacement procedures.
  • To underscore the importance of intraoperative transesophageal echocardiography in identifying potential complications.
  • To report the outcomes and complication rates of a series of heart valve replacement surgeries.

Summary:

  • Specific surgical techniques, including annulus preservation and leaflet management, are described for aortic and mitral valve replacements.
  • Suturing techniques are detailed to ensure secure prosthetic valve implantation and annulus attachment.
  • Intraoperative transesophageal echocardiography is utilized for real-time detection of stack valves, perivalvular leakage, and air embolism.

Impact:

  • The study reports a low mortality rate of 1.9% and a re-operation rate of 3.8% for infective endocarditis in 53 valve replacement cases.
  • Findings suggest that careful surgical technique and intraoperative monitoring contribute to favorable outcomes in heart valve replacement.
  • This work provides valuable insights for cardiac surgeons performing valve replacement procedures, aiming to minimize complications and improve patient results.