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  2. Roemheld syndrome - Wikipedia

    en.wikipedia.org/wiki/Roemheld_syndrome

    In the absence of heart abnormalities, the diagnosis is often made on the basis of symptoms. A gastroenterologist will perform a colonoscopy, endoscopy, and abdominal ultrasound to locate or rule out problems in the abdomen. Determining the cause of Roemheld syndrome is still not an exact science.

  3. Premature ventricular contraction - Wikipedia

    en.wikipedia.org/wiki/Premature_ventricular...

    A premature ventricular contraction (PVC) is a common event where the heartbeat is initiated by Purkinje fibers in the ventricles rather than by the sinoatrial node. PVCs may cause no symptoms or may be perceived as a "skipped beat" or felt as palpitations in the chest. PVCs do not usually pose any danger. [1]

  4. Complications: A Surgeon's Notes on an Imperfect Science

    en.wikipedia.org/wiki/Complications:_A_Surgeon's...

    The book is divided into three sections: Fallibility, Mystery, and Uncertainty, all going in depth into the problems physicians may face when practicing a variety of procedures in medicine. [2] Each of these sections puts forth different challenges doctors must face that make them imperfect and errant, resulting in the inevitable occurrence of ...

  5. Concealed conduction - Wikipedia

    en.wikipedia.org/wiki/Concealed_conduction

    A common example would be an interpolated PVC (a type of premature ventricular contraction) during normal sinus rhythm; the PVC does not cause an atrial contraction, because the retrograde impulse from the PVC does not completely penetrate the AV node. However, this AV node stimulation can cause a delay in subsequent AV conduction by modifying ...

  6. Vinyl chloride - Wikipedia

    en.wikipedia.org/wiki/Vinyl_chloride

    It is an important industrial chemical chiefly used to produce the polymer polyvinyl chloride (PVC). Vinyl chloride is a colourless flammable gas that has a sweet odor and is carcinogenic . Vinyl chloride monomer is among the top twenty largest petrochemicals ( petroleum -derived chemicals) in world production. [ 2 ]

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Polyvinylidene chloride - Wikipedia

    en.wikipedia.org/wiki/Polyvinylidene_chloride

    It is a remarkable barrier against water, oxygen, and aromas. It has a superior chemical resistance to alkalis and acids, is insoluble in oil and organic solvents, has a very low moisture regain and is impervious to mold, bacteria, and insects.

  9. PVC superphylum - Wikipedia

    en.wikipedia.org/wiki/PVC_superphylum

    The PVC superphylum is a superphylum of bacteria named after its three important members, Planctomycetota, Verrucomicrobiota, and Chlamydiota. [ 2 ] [ 3 ] Cavalier-Smith postulated that the PVC bacteria probably lost or reduced their peptidoglycan cell wall twice. [ 4 ]

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