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Related Concept Videos

Thevinin's Theorem01:15

Thevinin's Theorem

Thévenin's theorem plays a pivotal role in electrical circuit analysis, offering a solution to the challenges posed by variable loads within a circuit. In practical applications, it is common to encounter circuits where certain elements remain fixed while others fluctuate, often referred to as the "load." A typical household electrical outlet serves as a prime example of a variable load, as it can be connected to a variety of appliances, each with its own unique electrical characteristics.
Crossing over01:34

Crossing over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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Crossing Over01:30

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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Crossing Over01:34

Crossing Over

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Maximum Deflection01:13

Maximum Deflection

When analyzing beams under unsymmetrical loads, such as a train moving on a bridge, it is crucial to accurately determine the points of maximum stress and deflection. The process involves identifying the maximum deflection of the beam, which may not always occur at its midpoint due to the uneven distribution of the load.
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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.

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[When the throug is reached].

Alexander J Turk1, Erich W Russi

  • 1Klinik für Pneumologie, Departement Innere Medizin, Universitätsspital Zürich, Zürich.

Therapeutische Umschau. Revue Therapeutique
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

For severe chronic obstructive pulmonary disease (COPD), lung-volume-reduction surgery (LVRS) can offer significant improvement even when standard treatments fail. This case highlights potential benefits of LVRS in desperate situations beyond current evidence.

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Area of Science:

  • Pulmonology
  • Thoracic Surgery
  • Medical Case Reports

Context:

  • Severe chronic obstructive pulmonary disease (COPD) significantly impacts quality of life, limiting daily activities.
  • Standard medical therapies, including oxygen, are often insufficient for end-stage COPD.
  • Lung transplantation and lung-volume-reduction surgery (LVRS) are established options for select patients.

Purpose:

  • To report a case of unilateral LVRS in a patient with end-stage COPD who did not meet standard criteria.
  • To illustrate the potential for therapeutic decisions outside established evidence in critical situations.
  • To highlight the importance of clinical reasoning and experience in managing complex respiratory diseases.

Summary:

  • A patient with far-advanced COPD, severely debilitated and unresponsive to maximal therapy, underwent unilateral LVRS.
  • The decision was based on clinical judgment rather than strict adherence to evidence-based criteria for LVRS.
  • The patient experienced substantial subjective and objective improvement post-surgery with an uncomplicated recovery.

Impact:

  • This case suggests that carefully considered LVRS may benefit carefully selected patients with end-stage COPD, even in the absence of definitive scientific evidence.
  • It underscores the potential value of individualized therapeutic approaches in critical care settings.
  • Highlights the need for further research into expanded indications for LVRS in severe COPD.