Positive<unk>  causes an increase in cardiac output due to the increased force of contraction of heart muscles. This phenomenon is usually absent or even reversed (negative<unk>  in heart failure and other diseases of heart, such as cardiomyopathy and coronary artery disease. This is termed as the null or inverse staircase phenomenon. The probable cause for this<unk>  is attributed to mutations in SERCA2a.
Bowditch effect
Bouba/kiki effect
Baskerville effect
Windkessel effect
Eagle effect
Martha Mitchell effect
Bystander effect 
Ceiling effect 