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Explain the term of measurement of height in veous pressure?

Measurement of Height: Measurement of height of venous pressure is done from the sternal angle of Louis vertically by a ruler in centimetres. Normally it is 4.5 cm or so. If it is too high it is expressed as beyond ear lobes. In case of low venous pressure patient is made to lie flat and abdominojugular reflux manoeuvre is done. At bedside if a ruler is not available it can be roughly measured by finger breaths. Roughly at mid phalanx the width is 2 cm in an adult.

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