Category Archives: Cardiovascular

Muscular Artery

Muscular artery. Van Gieson’s Stain is a mixture of Picric Acid and Acid Fuchsin. It is the simplest method of differential staining of Collagen and other Connective Tissue.

Image from I-heart-histology (link)

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Miguel Servet stamp

This 2011 stamp from Spain honors the 500th anniversary of the birth of Miguel Servet and schematically depicts the systemic and pulmonary circulatory systems. Servet is also known as Michael Servetus and Michel de Villeneuve. He was born in 1511 in Villaneuve de Sijena, Spain, and was a famous Spanish theologian, physician, cartographer, and humanist. He was educated in Paris and Montpellier, receiving his MD in 1539. He is considered the first European to describe the function of the pulmonary circulation.

2011 Spanish stamp honoring the 500th anniversary of the birth of Miguel Servet, first European to describe the function of the pulmonary circulation. Image courtesy of Stanford T. Shulman, MD. 


In the 13th Century, an Arab physician, Ibn al-Nafis, had correctly described the pulmonary circulation, but it appears that Servetus independently made his discovery that in the lungs the blood meets air, changes from dark red to bright red, returns to the left ventricle and then to the body. Servetus buried his discovery within a theologic treatise he wrote in 1553, but he unwisely sent a copy to John Calvin, leader of the Protestant Reformation, located in Geneva.

Calvin denounced Servetus as a heretic and arranged for him (and his books) to be burned at the stake in 1553. Servetus is widely honored in Spain, as evidenced by this stamp and by the many streets, squares, parks, and at least one hospital named for him. (reblogged from pediatric annals (link)  )

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Hemifacial flushing

Hemifacial flushing developed in a 48-year-old man after he underwent laparoscopic cholecystectomy and pancreatic necrosectomy.

Image from NEJM (link). Image from Peter Keogh, MB, B.Ch.

After the induction of general anesthesia, a central venous catheter had been inserted into his left internal jugular vein under ultrasonographic guidance, without the use of local anesthetic infiltration. Hemifacial flushing was noted within 4 hours after the insertion of the central venous catheter. No additional findings suggestive of the harlequin syndrome or Horner’s syndrome were identified. The flushing was probably due to obstruction of venous outflow by a thrombus surrounding the newly inserted central venous catheter, as observed by means of bedside ultrasonography. After removal of the central venous catheter, the hemifacial flushing promptly resolved. (reblogged from NEJM)

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Hydrocephalus skull

Hydrocephalus, also known as “water on the brain,” is a medical condition in which there is an abnormal accumulation of cerebrospinal fluid (CSF) in the ventricles, or cavities, of the brain. This may cause increased intracranial pressure inside the skull and progressive enlargement of the head, convulsion, tunnel vision, and mental disability. Hydrocephalus can also cause death. (adapted from wikipedia)

Image source (sutured infection. tumblr ).  Joseph Vimont and Engelman – Skull of a Hydrocephalic Child, from Traité de Phrénologie Humaine et Comparée, 1832

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