According to studies by the Cleveland Clinic, it is common for patients to suffer depression after open heart surgery. Up to 20% of CABG patients suffer from severe depression following surgery. Depression has also been linked to increase death rates in patients post surgery, as well as significantly slowing recovery and healing. Due to the much accelerated recovery time with minimally invasive heart surgery, depression rates post operation seem to be directly linked to the quick return to normal activities. Studies in this area are ongoing, as minimally invasive procedures become more common.