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A new systematic review of randomized controlled trials has found evidence that non-invasive brain stimulation may reduce smoking frequency (number of cigarettes per day) in nicotine-dependent smokers.
Because nicotine can produce neuroadaptations in the brain that make it hard to quit smoking, researchers have sought ways to treat nicotine dependence with non-invasive brain stimulation (NIBS) techniques that counteract abnormal brain activity associated with chronic nicotine exposure.
This review, published by the scientific journal Addiction, looked at twelve randomized controlled trials of NIBS methods on a combined total of 710 participants with nicotine dependence. It used a network meta-analysis technique to compare the benefits and safety of various types of NIBS. Several NIBS techniques showed promising results, but the best results came from high-frequency repetitive transcranial magnetic stimulation (rTMS) of the left dorsolateral prefrontal cortex (DLPFC), which was associated with the greatest reduction in smoking frequency.
Interestingly, none of the investigated NIBS appeared to reduce the severity of either craving or nicotine dependence, compared with the control groups. It may be that enhancement of DLPFC activity increases dopamine release, counterbalances the reward system, and helps patients cope with unaffected craving and withdrawal symptoms.
None of the investigated NIBS was associated with dropout rates significantly different from those of the control groups, alternatives to synthroid suggesting that these kinds of treatments are well-tolerated.
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