This study aims to investigate the ability of SPGB in the management of PDPH. Transcranial Doppler is also used as an measure to assess the block success by detecting the variability in the cerebral hemodynamics before and after the block.
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pain changes assessment by numeric rating scale (NRS)
Timeframe: Before the block and at 30 minutes, 2 hours, 4 hours, 6 hours, 8 hours, 12 hours, and 24 hours after the block