What is cardiac creep?
First let me define Cardiac Creep. It is HR inflation INITIALLY caused when your “radiator” kicks in as you heat up. To dissipate the heat building up in your working muscles, the heart pumps more blood to the skin where sweating will cause it to cool down.
What causes artifact on a stress test?
“Attenuation artifact” observed in a nuclear stress test is due to the reduction in the intensity / strength of signal when it travels through various body tissues of different densities, such as breast tissues, chest wall, and organs under the diaphragm.
What does abnormal myocardial perfusion study mean?
Abnormal results may mean your heart isn’t pumping as well as it should. This might happen when you have heart damage or heart disease. Myocardial perfusion scans help us diagnose: Coronary artery disease. Heart failure.
What causes cardiac drift?
Cardiovascular drift is mostly caused by the natural increase in core body temperature when running. This increase in core body temperature elevates heart rate the same way running in hot conditions does.
What is a good cardiac drift?
It has been suggested that cardiovascular drift (after ~15 min of exercise) is primarily due to increased heart rate rather than a progressive increase in cutaneous blood flow, because the progressive decline in stroke volume persists even when cutaneous blood flow reaches a plateau after ~15 min [11], [17].
What is an artifact in your heart?
Electrocardiographic artifacts are defined as electrocardiographic alterations, not related to cardiac electrical activity. As a result of artifacts, the components of the electrocardiogram (ECG) such as the baseline and waves can be distorted. Motion artifacts are due to shaking with rhythmic movement.
How accurate is a myocardial perfusion scan?
A mycocardial perfusion scan is an imaging study that shows how well blood flows through the heart muscle. The sensitivity, specificity and accuracy of cardiac imaging with single-photon emission computed tomography (SPECT) is between 44 percent and 70 percent depending on the blood vessels involved.
What happens during cardiac drift?
Cardiovascular drift, the progressive increase in heart rate and decrease in stroke volume that begins after approximately 10 min of prolonged moderate-intensity exercise, is associated with decreased maximal oxygen uptake, particularly during heat stress.
How do you mitigate a cardiac drift?
Studies show ways to reduce cardiovascular drift are staying hydrated and biking at a lower pedal cadence. Cardiovascular drift is the term that describes the physiological changes in heart function during prolonged exercise. During prolonged exercise, stroke volume steadily drops as the heart rate increases.
What causes artifacts on ECG?
Causes of electrical artifacts on ECGs are manifold. External artifacts are usually caused by line current, which has a frequency of 50 Hz or 60 Hz. Internal electrical artifacts can be caused by tremors, muscle shivering, hiccups or, as in the present case, medical devices.