Post-dural Puncture Headache: Pathophysiology, Risk Stratification, Prevention, and Evidence-Based Management for Practicing Anesthesiologists.

Post-dural puncture headache (PDPH) is a well-recognized secondary headache disorder resulting from persistent cerebrospinal fluid (CSF) leakage following iatrogenic dural disruption during neuraxial procedures, including spinal anesthesia, diagnostic lumbar puncture, dural puncture epidural (DPE), and unintentional dural puncture (UDP). The syndrome reflects a complex interaction between CSF hydrodynamics, craniospinal compliance, vascular compensation, and nociceptive sensitization. Reduction in CSF volume produces intracranial hypotension and compensatory venous dilation in accordance with the Monro-Kellie doctrine, while loss of CSF buoyancy permits caudal displacement of intracranial structures, resulting in traction on pain-sensitive meninges and cranial nerves and generating the characteristic orthostatic headache. Procedural variables, particularly needle gauge and tip geometry, represent the most important modifiable determinants of PDPH risk. Incidence varies from less than 3% following spinal anesthesia with small-gauge atraumatic needles to 50-85% after UDP with large-bore Tuohy needles, whereas DPE techniques demonstrate comparatively low incidence (approximately 0.5-2%). Management ranges from conservative therapy with hydration, analgesics, and caffeine to targeted pharmacologic therapies and epidural blood patch, which remains the gold-standard intervention with success rates approaching 70-90%. Emerging evidence implicating glymphatic dysfunction, neuroinflammatory mechanisms, and advanced imaging-based leak localization may facilitate improved risk stratification and individualized therapeutic strategies.