Evaluation of PR, RR, QT Intervals and QT Dispersion Following Stellate Ganglion Block in Chronic Shoulder-Hand Pain Patients

: Right stellate ganglion block (SGB) can increase QT interval, rate‐corrected QT interval (QTc), QT dispersion (QTD), rate‐corrected QTD (QTcD), and RR interval while left SGB can decrease these intervals in healthy volunteers. No such studies have been conducted in patients with chronic pain, hence this study was designed to investigate the effects of left and right SGB on these variables in chronic shoulder–hand pain patients. In this study, 28 patients with chronic shoulder–hand pain of at least 6 months duration were given right or left SGB depending on the shoulder affected. A 12‐lead electrocardiogram (ECG) was recorded before the block, 30 minutes and 60 minutes after the block. PR interval, RR interval, QT interval were recorded in all 12 leads while QTc, QTD, and QTcD were calculated. Right SGB was performed in 21 patients. A significant decrease (P