In the steady state, cardiac output equals. venous return. Factors that cause hypereffective heart. Sympathetic stimulation can increase the effectiveness of the heart via: (2) increasing the strength of heart contraction. Factors that can cause a hypoeffective heart: (1) coronary artery blockage.
Thursday, March 19, 2015 - 11:09. Ed Sheeran has added yet another amazing accolade to his collection with the news that his global smash hit sophomore album X has hit the 2 million sales mark, joining a select band of chosen superstars to hit the same achievement.
Singer-songwriter Ed Sheeran performs in concert during his X World Tour 2014 in Philadelphia. Photograph: Owen Sweeney/Invision/AP Ed Sheeranâs latest album X has been named the biggest selling artist album of 2014 so far, in a year where British artists have dominated the album charts.