Friday, December 10, 2010

Fantastic Video about Auditory Transduction

This 7-minute video by Brandon Pletsch takes viewers on a step-by-step voyage through the inside of the ear, to the acoustic accompaniment of classical music.

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Characteristic Shape of Erythema Gyratum Repens and underlying malignancy

A 83 years old man was evaluated for a 1 year history of a pruritic, progressively worsening migratory rash, with associated weakness and a 5 kilograms weight loss. He had a history of 30 pack year smoking; he had stopped smoking 45 years earlier.

On examination, he had erythematous skin lesions that Characterised by concentric, raised, serpiginous bands, with desquamation (Panel A). The rash affected mainly the trunk and proximal extremities. A clinical diagnosis of erythema gyratum repens was made.

A C.T. scan revealed a pulmonary mass measuring 59 by 43 mm (Panel B). Bronchoscopy with biopsy revealed squamous-cell carcinoma of the lung.

Erythema gyratum repens is a rare syndrome typically associated with an underlying malignant condition. It occurs most frequently in conjunction with lung cancer and next most frequently with esophageal and breast cancers. It may regress with treatment of the cancer.
Treatment with gemcitabine was initiated for this patient, but he died 3 months after diagnosis, after only one infusion; the rash had not resolved.

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Extraglottis Devices

ABC of Medical Law(For Both Doctors and Lawyers)

Lorraine Corfield, Ingrid Granne, William Latimer-Sayer - ABC of Medical Law
BMJ Books | ISBN: 1405176288 | 2009-07-20 | File type: PDF | 64 pages | 1.11 mb

An understanding of medical law is increasingly important for all health professionals and this new ABC provides a basic introduction to the legal issues faced in health care that is accessible to anyone without any legal knowledge. The ABC of Medical Law provides ideal guidance to the practicing physician - covering just what you need to know without becoming embroiled in complicated legal discussion.

The ABC of Medical Law has up-to-date coverage of the legal issues to be found in daily medical practice, including confidentiality, research, consent, negligence, organ donation and human rights, as well as more contentious issues such as tissue retention and withholding/withdrawing treatment. Well illustrated and presented in a user-friendly format, chapters include summaries and cases to help clarify the points made.

Written by practising clinicians with expertise in medical law and a medical barrister, the ABC of Medical Law will help keep a practice within the constraints of the law and is ideal for GPs, junior doctors and medical students, and anyone wanting to understand the broad basics of medical law.

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Simple identification of Giant cell tumor in X-ray

Lytic lesion in the end of a long bone of a young adult after epiphyseal closure. Usually asymptomatic, but may be associated with intermittent dull pain and a palpable tender mass and predispose to pathologic fracture. Approximately 20% are malignant (best seen as tumor extension through the cortex and an associated soft-tissue mass on CT). There is much overlap in the radiographic appearance of benign and malignant lesions.

Imaging Findings :
Eccentric lucent metaphyseal lesion that may extend to the immediate subarticular cortex of a bone but does not involve the joint. Expansion toward the shaft produces a well-demarcated lucency, often with cortical expansion but without a sclerotic shell or border. Typically involves the distal femur, proximal tibia, distal radius, or ulna.
Giant cell tumor of the distal femur. Typical eccentric lucent lesion in the metaphysis extends to the immediate subarticular cortex. The surrounding cortex, though thinned, remains intact.

Malignant giant cell tumor. The tumor has caused cortical disruption, extends outside the host bone, and has an illdefined margin.

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Compensatory mechanisms that 'save' organ blood flow

Effects of inadequate perfusion on cell function.

Heart compensatory mechanisms that 'save' organ blood flow during shock is collected in "Heart SAVER":
  • Symphatoadrenal system activation
  • Atrial natriuretic factor release
  • Vasopressin release
  • Endogenous digitalis-like factor release
  • Renin-angiotensin-aldosterone system activation

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Diagnostic Algorithm for Evaluation of Acute Myelopathies and Myelitis.

Click on photo for enlargment

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Highest oxygen content in Fetal blood

Fetal blood from the placenta is about 80% oxygenated. However, mixture with unoxygenated blood at various points reduces the oxygen content.Which of the following fetal vessels contains blood with the highest oxygen content?
  • a.Abdominal aorta
  • b.Common carotid arteries
  • c.Ductus arteriosus..................

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