178 CHAPTER 8 Figure 1B. Drooling Quotient (DQ) and Visual Analogue Scale (VAS) at baseline, 8- and 32 weeks followup, after parotid duct ligation (PDL) as a re-intervention. DISCUSSION Surgery is the accepted “last resort” when conservative treatment options are no longer sufficient and the patient suffers from severe persistent drooling.14-16 Several studies have assessed the efficacy of surgical procedures for drooling, with a variability in results. The reason for the differences in success after surgical interventions are unclear, theories vary from surgical failure to heterogeneity of the patient population, insufficient oral-motor control, and underestimation of
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