Heart rate and ventricular wall tension
Yes.
Increased myocardial contractility increases the oxygen demand for the myocardial cells. If the demand of oxygen exceeds the supply, death of myocardial tissue can occur.
YES
Myocardial Oxygen demand
When the heart beats too rapidly, it pumps less efficiently and blood flow to the rest of the body, including the heart itself is reduced. The higher-than-normal heartbeat means there is an increase in demand for oxygen by the myocardium (heart muscle) - if this persists it can lead to myocardial infarction (heart attack), caused by the dying off of oxygen-starved myocardial cells.
increased demand for oxygen
Oxygen diffusion increases as the need increases. It is a matter of supply and demand.
There is an increase in the breathing rate, this is due to the demand for oxygen from the working muscles. •The Respiratory Volume increases, this is due to the increase of Tidal Volume and breathing rate whilst meeting the demand of oxygen for the working muscles.
Rate-pressure product is a good estimate of myocardial oxygen demand. RPP = Heart Rate X Systolic Blood Pressure. When using the RPP with patients with Coronary Artery Disease and with angina symptoms, it can indicate the oxygen demand at which Angina initially occurs (angina threshold).
Coronary artery
The circulatory system and heart are vessels that carry oxygen to myocardial cells. They help send blood throughout the entire body each time a person's heart beats.
Myocardial ischemia results from the temporary lack of oxygen; if ischemia is prolonged, it could result in permanent damage to the heart muscle. This condition is called myocardial infarction, commonly known as a heart attack.ischemia