The Efficacy of Non-invasive Brain Stimulation (NIBS) on Cognitive Functions in Patients With Chronic Obstructive Pulmonary Disease (COPD)

The goal of this clinical trial is to examine if non-invasive brain stimulation (NIBS) can enhance cognitive function with chronic obstructive pulmonary disease (COPD) population. The main questions it aims to answer are: * What is the possibility effect of using the NIBS on cognitive functions as well as the cardiopulmonary parameters in COPD population? * What is the relation between cognitive function parameters and cardiopulmonary parameters in COPD population who suffer from cognitive impairment (CI)? Researchers will compare NIBS to a sham-NIBS to see if NIBS works to improve cognitive function in COPD population. Participants will: Receive NIBS or a sham-NIBS 3 sessions/week for 3 weeks for 20 min each session. Visit the clinic at the beginning for baseline assessment then after the completion of the 3 weeks to reassess them. Outcome measures for cognitive parameters and pulmonary parameters will be taken pre and post NIBS intervention

Inclusion Criteria: * Adult age from 18 years old to 70 years old. * Patients with confirmed chronic obstructive pulmonary disease (COPD) via pulmonologist * All stages of COPD severity will be included * Stable patients, which means they were not admitted to the hospital in the last 3 months * Patients with COPD with confirmed cognitive impairment by Montreal Cognitive Assessment (MoCA) test. * All MoCA stages will be included. Exclusion Criteria: * Patients without COPD * Unstable patients with several admission in the last 3 months * Patients with COPD but without cognitive impairment. * COPD patients who suffered from any neurological problems * COPD patients who are contraindicated for using brain stimulation like psychiatric disorders.