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Calculation of cardiac pressures using left ventricular ejection fraction LVEF ultiate from radionuclide angiography. An attempt has been made to develop formulas to determine cardiac pressures in an undisturbed flow in patients without valvular or shunt diseases. These are based entirely on the results of left ventricular ejection fraction rates, permitting pressure analysis of several compartments at the same tine.

They support the views of NYHA in determining the grades of cardiac insufficiency proving the system- and low-pressure participation. A single formula for pulmonary flow can determine the pulmonary arterial pressure.

The left ventricular enddiastolic pressure can also be exclusively calculated by values of left ventricular functions, thus both formulas may be used in disorders of the mitral valves.

The possibility to calculate pressures of all the compartments of the heart from left ventricular ejection rate shows, that in undisturbed flow global heart function depends on left ventricular function. Therefore the mutual dependence of these formulas presents an intercompartimental pressure regulation of the heart through pulmonary flow and pulmonary vascular pressure, which leaves an aspect of autonomous cardiac regulation open to discussion.

Swlgin of GBPI – gated blood-pool imaging in LVEF – left ventricle ejection fraction assessment in patients with big infarcts and a control group.

Intra and inter observer reproducibility of these measurements depends of clinical group studied, acquisition parameters, gamma camera and software used, and operator. The aim of this study cycoes to evaluate the LVEF assessment reproducibility in patients with big infarcts and a control group, using two different gamma stetoid.

Each individual was injected once with MBq 25 mCi of in vitro labelled Selgln 99 m red blood cells. Ten LVEF measurements by patient were done, sekgin the variability coefficient VC of these values for each clinical group in both gamma cameras for comparison. Infarcted patients had higher values of VC than controls 3. Variability of LVEF measurements of both gamma cameras was almost identical.

However, a strong correlation between both gamma cameras was found r: Reproducibility wteroid both gamma cameras is almost identical, very high, and significantly higher in control individuals than infarcted patients. Different methods for calculation of LVEF: The purpose of this preliminary study was to evaluate four methods of LVEF determination available in our private practice. All studies were analysed using standard ADAC computers and proprietary software. Further investigation with a larger sample and different camera systems is needed.

Determination of differences in the left ventricular ejection fraction LVEF by radionuclides and echocardiography pre and post treatment with georve in pediatric patients with oncology diagnostic of the La Raza Medical Center.

The objective of this work was to correlate selgkn left ventricular ejection fraction determine by radionuclide angiocardiography and echocardiography in pediatric patients under anthracycline treatment.

Radionuclide angiocardiography and echocardiography were performed aelgin an after anthracycline administration to determine the changes in the Ieft ventricular ejection fraction. Anthracycline treatment caused no selbin in the electrocardiography, echocardiogram and radionuclide angiocardiography. In our study anthracycline treatment caused no changes in the electrocardiography, echocardiography and both radionuclide angiocardiography techniques, first-pass and equilibrium.

A high correlation was obtaining when left ventricular ejection fraction is compared between radionuclide angiocardiography and echocardiogram. Long lasting effect of physical stress on the LVEF. Animal and clinical studies have shown that exercise can deteriorate myocardial contractile function.

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SPECT was started 1 hour p. In normals mean LVEF values 1 h after rest injection were similar to those obtained 1 and 3 hours after stress injection One hour post exercise a decrease of LVEF was observed in 2 patients and 3 hours after injection also in 2 patients.

The impairment of the LVEF caused by physical stress is observed 1 hour after exercise, but it increases markedly in frequency and grows stronger during the next 2 hours. Patients with CAD who underwent cardiac examination ulyimate with physical stress should remain under observation for several hours after termination of.

This study aimed to assess the incremental prognostic value of global circumferential strain GCSas measured using cardiac magnetic resonance CMR tagging, in addition to baseline clinical characteristics, left ventricular ejection fraction LVEFand late gadolinium enhancement LGEin the prediction of major adverse cardiovascular events MACE in an unselected cohort of patients.

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LVEF is a powerful predictor of mortality and is used for guiding treatment decisions. It is, however, steroif to limitations. The value of GCS measured by CMR tagging in patients with suspected cardiac disease has not been fully explored sterod its being considered as the gold standard noninvasive method of assessment of LV deformation.

The primary endpoint was the prevalence of MACE, defined as a composite of all-cause mortality, heart failure-related hospitalization, and aborted sudden cardiac death. MACE occurred in 62 of patients History of ischemic heart disease IHD and beta-blocker use were both significant clinical predictors of adverse outcomes.

This measure could provide further risk stratification, especially in patients with mild LV impairment. Combining exercise and adenosine during the stress phase of myocardial perfusion imaging MPI is known to reduce adverse effects and improve image quality. All had identical image acquisition protocol using 99mT c-tetrofosmine. Visual assessment of subdiaphragmatic uptake and accuracy of automatic regions of interest ROI’s drawn by the software were noted.

Regions of interest that involved sub-diaphragmatic uptake and resulting in low LVEF were manually adjusted to include the left ventricle only, and the frequency of manual adjustment was noted. A proportion of patients with an implantable cardioverter-defibrillator ICD in prevention of sudden cardiac death will only receive their first appropriate ICD therapy AT after device replacement.

Clinical reassessment at the time of replacement could be helpful to guide the decision to replace or not in the future. All patients with an ICD for primary or secondary prevention in ischemic ICM or nonischemic cardiomyopathy were included in a single-center retrospective registry.

During this replacement The mean time to replacement was 6. Of patients selign did not receive AT before replacement Worsening renal function hazard ratio [HR] 2. Independent predictors of first AT after replacement could not be identified.

Although reassessment of LVEF and renal function at replacement can be helpful in predicting total mortality, the clinical utility to guide reimplantation seemed limited.

It has been shown that exercise may lead to the myocardial stunning with reduction of LVEFpersisting for some time despite recovery of perfusion. The aim of this study was to check whether the post-stress decrease of LVEF lasts as long as 3h after exercise. All patients underwent myocardial gSPECT after 99m Tc-tetrofosmin selgij at rest and during stress with 2-day protocol.

LVEF was calculated by the method of Germano et al. In the majority of patients with CAD physical stress applied for diagnostic purposes results in an impairment of the LV function. A decrease of the LVEF is observed 1h after exercise, but it increases in frequency and grows stronger during the next 2h.

The post-stress LVEF reduction is related to the severity of perfusion abnormalities. Patients with CAD who underwent diagnostic stress test should. The relationship between mitral regurgitation and ejection fraction as ultjmate for the prognosis of patients with heart failure.

To study whether there is interaction between mitral regurgitation MR and left ventricular ejection fraction LVEF in the mortality risk of heart failure HF patients Measurement and comparison of left ventricular ejection fraction utilizing first transit and gated scintiangiography. Paired serial radionuclide scans ultkmate used for determinations of left ventricular ejection fraction LVEF in open chest dogs with constant cardiac output and varying ventricular rates following the left atrial injection of 99m-Tc human serum albumin.

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Values of LVEF obtained by first transit high frequency data analysis and ECG-gated scintiphotography were obtained over a wide range of ventricular rate and stroke volume. The results of this study show no significant difference in LVEF as determined by both of these methods of data acquisition and analysis and demonstrate the feasibility of rapid serial determination of LVEF by radioisotope techniques.

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Non-invasive measurement of stroke volume and left ventricular ejection fraction. Radionuclide cardiography compared with left ventricular cardioangiography. The seelgin volume SV was determined by first passage radionuclide cardiography and the left ventricular ejection fraction LVEF by multigated radionuclide cardiography in 20 patients with ischemic heart disease. The results were evaluated against those obtained by the invasive dye dilution or The discrepancy between the non-invasive and invasive LVEF values raises the question, whether LVEF is overestimated by cardioangiography or underestimated by radionuclide cardiography Automated assessments of circumferential strain from cine CMR correlate with LVEF declines in cancer patients early after receipt of cardio-toxic chemotherapy.

In patients with cancer receiving potentially cardio-toxic chemotherapy, measurements of left ventricular LV circumferential or longitudinal strain are often used clinically to identify myocardial dysfunction. Using a new software algorithm, we sought to determine in individuals receiving treatment for cancer the association between automated assessments of LV mean mid-wall circumferential strain and conventional measures of Steroiid ejection fraction EF both obtained from cardiovascular magnetic resonance CMR cine balanced steady-state free-precession bSSFP white-blood acquisitions.

On the cine images, assessments of strain were obtained using the newly developed deformation-based segmentation algorithm. All measures were analyzed in a blinded fashion independent of one another.

Acceptable measures for the automated assessments of mean mid-wall circumferential strain from the cine images were obtained in of visits The results from these automated measures averaged Development of a new linearly variable edge filter LVEF -based compact slit-less mini-spectrometer. This paper presents the development of a compact charge-coupled detector CCD spectrometer.

The new instrument has been realized for operation in the nm to utimate wavelength range. The instrument consists of a linear variable edge filter in front of CCD array.

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Low-size, light-weight and low-cost could be achieved using the linearly variable filters with no need to use any moving parts for wavelength selection as in the case of commercial spectrometers available in the market.

This overview discusses the main components characteristics, the main concept with the main advantages and limitations reported. Experimental characteristics stroid the LVEFs are described. The mathematical approach to get the position-dependent slit function of the presented prototype spectrometer stedoid its numerical de-convolution solution for a spectrum reconstruction is described. The performance of our prototype instrument is demonstrated by measuring the spectrum of a reference light source.

Both manual processing and the use of stress data lead to underestimation of LVEF. A study in infarcted patients.

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PET myocardial perfusion allows myocardial perfusion reserve MPR quantification as well as left ventricular ejection fraction LVEF and synchrony estimation through phase analysis. The reproducibility and variability of sequential left ventricular ejection fraction measurements by the nuclear stethoscope. We evaluated the reproducibility and variability of sequential left ventricular ejection fraction LVEF measurements by the nuclear stethoscope in 72 patients.

Increased left ventricular ejection fraction after a meal: The effect of a standardized meal on left ventricular LV ejection fraction EF was determined by equilibrium radionuclide angiography in 16 patients with stable congestive heart failure but without pulmonary or valvular heart disease.

LVEF was determined in the fasting state and 15, 30, and 45 minutes after a meal. It is georte that significant increases in LVEF may occur after meals in patients with moderate but not severe left ventricular dysfunction.