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Early use of antivirals key in H1N1 flu: WHO

in.reuters.com

Early use of antivirals key in H1N1 flu: WHO

Early use of antivirals is effective in treating H1N1 flu and health authorities must be vigilant for signs of drug resistance, the World Health Organisation said on Friday.

Drug-resistant pandemic flu viruses have appeared infrequently so far and there is no evidence they are spreading, but further cases are likely, the WHO said on its website.

Growing international experience showed the importance of the early use of oseltamivir, manufactured as Tamiflu by Roche Holding and Gilead Sciences, or zanamivir, an inhaled medicine produced as Relenza by GlaxoSmithKline in swine flu cases,” the WHO said.

“The experience of clinicians, including those who have treated severe cases of pandemic influenza, and national authorities, suggests that prompt administration of these drugs following symptom onset reduces the risk of complications and can also improve clinical outcome in patients with severe disease,” the Geneva-based U.N. agency said.

“This experience further underscores the need to protect the effectiveness of these drugs by minimizing the occurrence and impact of drug resistance,” it said.

Most people who contract pandemic influenza suffer only mild symptoms before recovery without treatment, but children, pregnant women and those with some existing health conditions are vulnerable to a more severe attack or even death.

The WHO, which declared H1N1 a global pandemic in June, says one third of the world’s population of nearly seven billion people could catch it.

The risk of resistance is higher in patients who suffer from weak immune systems and have already been treated with oseltamivir, it said.

It is also high in people who are treated with the antivirals as a prophylactic — as a precaution after exposure to someone with influenza, but nevertheless develop the disease.

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Brain Tumor Surgery

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Brain Tumor Surgery

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A brain tumor is an abnormal growth of cells within the brain or inside the skull, which can be cancerous or non-cancerous (benign).

It is defined as any intracranial tumor created by abnormal and uncontrolled cell division, normally either in the brain itself (neurons, glial cells (astrocytes, oligodendrocytes, ependymal cells), lymphatic tissue, blood vessels), in the cranial nerves (myelin-producing Schwann cells), in the brain envelopes (meninges), skull, pituitary and pineal gland, or spread from cancers primarily located in other organs (metastatic tumors).

Primary (true) brain tumors are commonly located in the posterior cranial fossa in children and in the anterior two-thirds of the cerebral hemispheres in adults, although they can affect any part of the brain.

Signs and symptoms

Symptoms of brain tumors may depend on two factors: tumor size (volume) and tumor location. The time point of symptom onset in the course of disease correlates in many cases with the nature of the tumor (“benign”, i.e. slow-growing/late symptom onset, or malignant, fast growing/early symptom onset) is a frequent reason for seeking medical attention in brain tumor cases.

Large tumors or tumors with extensive perifocal swelling edema inevitably lead to elevated intracranial pressure (intracranial hypertension), which translates clinically into headaches, vomiting (sometimes without nausea), altered state of consciousness (somnolence, coma), dilatation of the pupil on the side of the lesion (anisocoria), papilledema (prominent optic disc at the funduscopic examination). However, even small tumors obstructing the passage of cerebrospinal fluid (CSF) may cause early signs of increased intracranial pressure. Increased intracranial pressure may result in herniation (i.e. displacement) of certain parts of the brain, such as the cerebellar tonsils or the temporal uncus, resulting in lethal brainstem compression. In young children, elevated intracranial pressure may cause an increase in the diameter of the skull and bulging of the fontanelles.

A bilateral temporal visual field defect (bitemporal hemianopia—due to compression of the optic chiasm), often associated with endocrine disfunction—either hypopituitarism or hyperproduction of pituitary hormones and hyperprolactinemia is suggestive of a pituitary tumor.

Treatment and prognosis

Many meningiomas, with the exception of some tumors located at the skull base, can be successfully removed surgically. In more difficult cases, stereotactic radiosurgery, such as Gamma knife, Cyberknife or Novalis Tx radiosurgery, remains a viable option.

Most pituitary adenomas can be removed surgically, often using a minimally invasive approach through the nasal cavity and skull base (trans-nasal, trans-sphenoidal approach). Large pituitary adenomas require a craniotomy (opening of the skull) for their removal. Radiotherapy, including stereotactic approaches, is reserved for the inoperable cases.

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