Translation of "Herzzyklus" in English

The impedance Z exhibits relatively major variations during a cardiac cycle.

With that, the RT interval of the subsequent cardiac cycle can be determined.

Preferably a typical heart cycle for each different SP is used for assessment.

This phase of the heart's activity is called "diastole.''

Comparison of a 2D dynamic MR acquisition showing the heart during the cardiac cycle.

For this purpose, the signal recording is synchronized to a defined moment of the heart cycle.

Furthermore, the measurement provides information on the contraction of the heart during a cardiac cycle.

This occurs, for example, in the repolarization of the cardiac atria in the P-Q interval of the heart cycle.

The system thus equipped then makes it possible to perform ventilation with positive pressure in synchronization with the heart cycle.

The peaks upward correspond to (dP/dt) max in each cardiac cycle.

The combination of contraction (systole) and relaxation (diastole) is called the cardiac cycle.

With increasing heart rate, in one or more embodiments, temporal proportion of the left-ventricular systole in relation to a total cardiac cycle also rises.

In order to ensure comparability, the RF pulse should always be generated in the same phase of the cardiac cycle.

Right: normal LV wall velocities during cardiac cycle, here a color coded display.

Myocardial function during the whole cardiac cycle is more complex, due to myocardial architecture.

During a single cardiac cycle the tissues of the heart experience complex patterns of tensile, compressive and, in particular, shear deformation.

Other than a pacemaker, which delivers an electrical signal with the intention to result in cardiac contraction, the Cardiac contractility modulation treatment applies the NES, adjusted to and synchronized with the electrical action in the cardiac cycle.

In this phase of the cardiac cycle, electrical signals cannot trigger new cardiac muscle contractions, hence this type of stimulation is known as a non-excitatory stimulation.

If the complete heart cycle is to be entered into the second image memory 9, so that a very precise superposition can be achieved, the memory 9 must have a storage capacity of about 50 through 60 fields.

The storage capacity may be reduced, however, if only every second or third field is stored, which results in images of the heart cycle which are sufficiently precise for many applications.

In this type of computer tomography apparatus, a very fast movement of the focus around the circular anode is possible, so that the registration of heart phases is possible during a single heart cycle.

Because the heart cycles are not always identical, for example an extra systole may appear, the control device 18 has means in the form of an arithmetic unit 18C for determining the length of an average typical heart cycle before entry of the mask cycle into the second image memory 9.

In this pacemaker, the time integral of the impedance over a predetermined portion of the heart cycle is determined as a primary impedance variable and used for rate adaptation.

This compression is based on the condition that the EKG signal is constant (lies near the zero line) for the majority of a cardiac cycle, so no signal value needs to be stored for these times.

The slope of the impedance signal at a fixed point during a heart cycle is determined as a suitable parameter to construct the time series from a signal curve.

In practice, however, a sliding x-out of y-counting procedure with rejection of the ‘respective ‘oldest’ cardiac cycle based on the FIFO-principle will be more desirable. as it permits a faster reaction on the part of the pacemaker.

A cardiac pacemaker as set forth in claim 4 wherein the modulation device for producing a modulated rate control signal for evaluating the influence on the calibration signal of the second measuring and processing device implements modulation with a time constant which approximately corresponds to either a cardiac cycle or stimulation interval.