Methadone maintenance treatment (MMT) and protracted abstinence (PA) effectively reduce the craving for heroin among individuals with heroin use disorder (HUD). However, the difference in their effects on brain function, especially the coupling among the large-scale brain networks (default mode [DMN], salience [SN], and executive control [ECN] networks), remains unclear. This study analyzed the effects of the MMT and PA on these networks and the predictive value of the bilateral resource allocation index (RAI) for craving for heroin.

Twenty-five individuals undergoing the MMT, 22 undergoing the PA, and 51 healthy controls underwent resting-state functional magnetic resonance imaging (rs-fMRI). Independent component analysis identified the ECN, DMN, and SN. The SN-ECN and SN-DMN connectivity and the bilateral RAI were evaluated. The relationships between network coupling and clinical and psychological characteristics were analyzed. The multiple linear regression model identified significant variables for predicting craving scores.

The MMT group showed significantly stronger SN-left ECN (lECN) coupling and left RAI than the PA group. In the MMT group, SN-lECN connectivity and bilateral RAI were positively correlated with the total methadone dose. In both treatment groups, SN-right ECN (rECN) connectivity and right RAI were negatively correlated with craving. The models revealed that the bilateral RAI and the MMT and PA were associated with the craving.

The MMT enhances SN-lECN coupling and the left RAI more than the PA, possibly due to higher control modulation. The RAI could help predict heroin craving in individuals with HUD undergoing either treatment program.

Protracted abstinence syndrome represent group of attenuated psyc that lead to a persistant sense of discomfort among misuse patients after detoxification and may last for some months.Poor sleep in terms of duration and quality is one of the major symptoms of protracted abstinence syndrome

To assess polysomnography parameters as potential risk for relapse over six months

60 male patients with heroin misuse according to DSM V have been recruited immediately after detoxification phase, they were not receiving other psychactive substances or medications, polysomnography was done in the second week after detoxification to allow washout of medications used during detoxification and then a monthly sleep assessment through sleep diary and daytime sleepiness using visual analogue scale. Relapse was prooved through urine test.

Sample contained 60 male patients with heroin misuse disorder, detoxified successfully with a mean age 35.47±7.32 and addiction severity index total score 3.21±0.22, polysomnography was done to all sample patients one week after detoxification, 20% relapsed by the third month, rising to 30% by the six month. NREM stages I and II, both limb movement and arousal indices showed significant differnce between relapsed and non-relapsed patients.

Sleep disturbance is common among detoxified heroin misuse patients. Polysomnographic parameters such as percentage of NREM I and I, arousal index and limb mouvement index can potentially predict future relpase over six month follow up period.