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Chapter 15 ANALGESICA AND ANESTHESIA - page 36 / 52

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SPINAL (SUBARACHNOID) BLOCK

Vasodilatation from sympathetic blockade + obstructed venous return from Ut compression of the vena cava & adjacent large veins

Supine position : absence of maternal hypotension measured in brachial a. → pl blood flow may still be significantly reduced

Prevention : 1000ml Ringer lactate infused over 20min before spinal injection and 5mg bolus of ephedrine as needed to maintain blood pressure

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