Term
|
Definition
| approximately 1/10th of a second delay, ensures that the atria has a chance to contract before the ventricles |
|
|
Term
|
Definition
|
|
Term
|
Definition
| ventricular depolarization |
|
|
Term
|
Definition
| ventricular repolarization |
|
|
Term
|
Definition
| from the beginning of the p wave to the beginning of the qrs complex, variances in duration indicate different conditions of "heart block" or pre-excitation syndrome |
|
|
Term
|
Definition
| normal rhythm where the sino-atrial node is leading the pulse rate |
|
|
Term
|
Definition
| umbrella term for a group of arrhythmias associated with a malfunctioning SA node |
|
|
Term
|
Definition
| group of excitable cells, sometimes able to outcompete the SA node for being the dominant rhythm, usually causing tachycardia |
|
|
Term
|
Definition
| sometimes called premature systole, caused by ectopic stimulation |
|
|
Term
|
Definition
| circus rhythm, caused when excitation re-stimulates a section of cardiac tissue that was recently stimulated, but no longer refractory |
|
|
Term
|
Definition
| condition of extreme tachycardia, usually leads to fibrilation |
|
|
Term
|
Definition
condition of disorganized, uncoordinated electrical activity
ventricular fibrillation is a major cause of cardiac arrest without defibrillation usually leads to sudden cardiac death |
|
|
Term
|
Definition
| amount of blood expelled in a single beat |
|
|
Term
|
Definition
| amount of blood within the chamber after relaxation |
|
|
Term
|
Definition
percentage of blood ejected from the ventricle in relation to starting volume
EF = stroke volume / end diastolic volume |
|
|
Term
|
Definition
| amount of blood in a ventricle at the end of systole |
|
|
Term
|
Definition
| intrinsic ability of the myocardium to contract |
|
|
Term
|
Definition
| the initial stretching of the myofibrils at the end of diastole |
|
|
Term
|
Definition
| the tension or stress exerted on the wall of the ventricle during ejection |
|
|
Term
|
Definition
| systemic or pulmonary vascular resistance is the force that the heart must overcome in order to eject blood into the arteries |
|
|
Term
|
Definition
| stroke volume x heart rate |
|
|
Term
|
Definition
| the inability of the heart to produce adequate pumping action to meet the needs of the body |
|
|
Term
|
Definition
| tissue death due to localized lack of oxygen due to obstruction of the tissue's blood supply |
|
|
Term
|
Definition
| pain in the chest due to low oxygen supply to the heart muscle, commonly due to obstruction or spasm of the coronary arteries |
|
|
Term
|
Definition
| hardening of the arteries, due to plaque build up within the blood vessels |
|
|
Term
|
Definition
|
|
Term
|
Definition
| any detached travelling mass within the vasculature which may cause obstruction |
|
|
Term
|
Definition
| complex of proteins that adheres cells to one another |
|
|
Term
|
Definition
| longer than normal P-R interval caused by a cardiac conduction system disease |
|
|
Term
|
Definition
| disease of the conduction system, one or more (but not all) impulses fail to conduct to the ventricles |
|
|
Term
|
Definition
| disease of the cardiac conduction system, complete heart block, no impulses are able to be conducted to the ventricles, leads to an "escape rhythm" where a lower accessory pacemaker will overtake function |
|
|
Term
| 4 factors determining cardiac output |
|
Definition
| preload, afterload, contractility, and heart rate |
|
|
Term
|
Definition
| stroke volume increases with increased end diastolic volume, all other factors being equal, muscle stretch causes greater force applied |
|
|
