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Medicine

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Neurology

Question
24 out of 27
 

Water shed infract is most commonly seen in which organ?

(NEET 2013)



A Heart
B Lungs

C Brain
D Kidney

Ans. C

Brain

A watershed stroke is defined as an ischemia, or blood flow blockage, that is localized to the border zones between the territories of two major arteries in the brain. The term “watershed” refers to those areas of the brain that receive dual blood supply from the branching ends of two large arteries.

1). Watershed locations are those border-zone regions in the brain supplied by the major cerebral arteries where blood supply is decreased.

2). Watershed strokes are localized to two primary regions of the brain, and are termed cortical watersheds (CWS) and internal watersheds (IWS).

a. Cortical watershed strokes (CWS), or outer brain infarcts, are located between the cortical territories of the anterior cerebral artery (ACA),middle cerebral artery (MCA), and posterior cerebral artery (PCA).

b. Internal watershed strokes (IWS), or subcortical brain infarcts, are located in the white matter along and slightly above the lateral ventricle, between the deep and the superficial arterial systems of the MCA, or between the superficial systems of the MCA and ACA.

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