What does the R wave indicate?
the R wave reflects depolarization of the main mass of the ventricles –hence it is the largest wave. the S wave signifies the final depolarization of the ventricles, at the base of the heart.
What is a gated MRI?
Cardiac gating or cardiac triggering refers to the gain of information about specific time points and their use for image acquisition during the cardiac cycle.
What is EKG gating?
The process of synchronizing data acquisition with the ECG waveform of the patient is known as ECG gating.
What affects R wave?
The amplitude and direction of the R wave depends on the “electrical picture” the recording electrodes “see” as current spreads through the ventricular conduction system. The closer the mean QRS axis is to the electrical axis of Lead II, the larger the amplitude of the R wave.
Is the R wave ventricular contraction?
The QRS complex refers to the combination of the Q, R, and S waves, and indicates ventricular depolarization and contraction (ventricular systole). The Q and S waves are downward waves while the R wave, an upward wave, is the most prominent feature of an ECG.
What is anterior myocardial infarction?
Anterior myocardial infarction is associated with a decrease in blood supply to the anterior wall of the heart. Classification of anterior myocardial infarction is based on EKG findings as follows: Anteroseptal – ST-segment elevation in leads V1 to V4. Anteroapical (or mid-anterior) – ST-segment elevation in leads V3- …
What is a gated CT?
The term ‘gated’ simply means that your heart rate will be monitored during the scan to ensure the scanner takes pictures of your heart and chest between your heart beats. WHAT TO EXPECT. Prior to arrival: • You will be asked to not eat any solids for 4 hours before your scan. Clear liquids are encouraged, if able.
What is a cardiac MRI with contrast?
Contrast-enhanced MRI is often used to assess scars to the heart tissue and detect cardiac ischemia, a condition of reduced blood flow to the heart resulting from blockage of the coronary arteries. Contrast-enhanced cardiac MRI is also frequently used to evaluate diseases like cardiomyopathy and myocarditis.
What is a gated chest CT?
WHAT DOES GATED MEAN? The term ‘gated’ simply means that your heart rate will be monitored during the scan to ensure the scanner takes pictures of your heart and chest between your heart beats.
What is a gated cardiac CT?
Cardiac gating or ECG gated angiography in CT is an acquisition technique that triggers a scan during a specific portion of the cardiac cycle. Often this technique is conveyed to obtain high-quality scans void of pulsation artefact.
What is the amplitude of R wave?
R wave amplitude (millimeter) was measured as the vertical distance from the peak of the R wave to the baseline (as defined by two consecutive PR intervals). The sum of R wave amplitudes for anterior wall (V2 through V5) was calculated.
Why is the R wave the largest amplitude?
The wall of the ventricles are very thick due to the amount of work they have to do and, consequently, more voltage is required. This is why the R wave is by far the biggest wave generated during normal conduction.