Biomedical subjects

R Unterberg

Publications and source records attributed to R Unterberg.

14 recordsLinked to original sources

PubMed1992

[Function of the right ventricle in patients with dilated cardiomyopathy].

To analyze right-ventricular size and function and their relationship to left-ventricular dimensions in patients with dilated cardiomyopathy (DCM), biplane cineventriculography was performed in 57 patients. The results were compared to 15 normals (N). In patients dilatation of the right ventricle (RVEDVI: DCM: 126.5 +/- 41.4 ml/m2, N: 90.5 +/- 9.2 ml/m2, 2 p < 0.05) was less pronounced than dilatation of the left ventricle (LVEDVI: DCM: 136.0 +/- 45.8 ml/m2, N: 76.7 +/- 7.9 ml/m2, 2 p < 0.05). Left-ventricular ejection fraction (LVEF: DCM: 36.1 +/- 10.2%, N: 64.4 +/- 3.8%, 2 p < 0.05) was more reduced than right-ventricular ejection fraction (RVEF: DCM: 39.7 +/- 11.5%, N: 58.3 +/- 3.3%, 2 p < 0.05). Concerning the individual patient, a good correlation was found between right- and left-ventricular stroke volume (r = 0.74), whereas ejection fraction (r = 0.58), enddiastolic (r = 0.52) and endsystolic volume (r = 0.55) of the left and right ventricle correlated only moderately. Twenty-three of the 57 patients showed pronounced differences between right- and left-ventricular ejection fraction. The difference RVEF-LVEF was < = -10% in six patients, i.e., right-ventricular ejection fraction was markedly more reduced than left-ventricular ejection fraction. Right-ventricular myocardial biopsy was performed in five of these six patients with histologic evidence of dilated cardiomyopathy and, also, no signs of right-ventricular dysplasia (no lipomatous tissue replacement).(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMed1989

Quantification of myocardial ischemia and infarction with single photon emission computed tomography.

To evaluate the feasibility of 201Tl single photon emission computed tomography (SPECT) for quantitative detection of myocardial infarction and ischemia, scintigraphic studies were related to angiographic findings. In study A infarct sizes with SPECT were compared with the angiographic infarct sizes of 30 patients. A linear correlation was found for the % infarct of the left ventricular circumference between both methods (r = 0.73; P less than 0.001; mean infarct size 20.7% +/- 10.5% (angio) vs 19.8% +/- 12.9% (SPECT), mean +/- SD). Furthermore, a significant inverse correlation between scintigraphic infarct size and left ventricular ejection fraction (r = -0.87, P less than 0.001) was obtained. In study B exercise/rest 201Tl SPECT was used for quantification of myocardial ischemia. Forty-three patients underwent both stress 201Tl SPECT and biplane exercise left ventriculography. Ischemia was expressed as % defect size of the left ventricular circumference. Sensitivity and specificity for detection of ischemia were 96% and 100% respectively with stress SPECT. Extent of myocardial ischemia correlated significantly with both methods (r = 0.63; SPECT defect = 1.0 angiographic ischemia +2%; P less than 0.001). The regression followed the line of identity and the mean sizes of ischemia were identical (SPECT 12.2 +/- 7.6% vs 14.6 +/- 12.4% ventriculography, mean +/- SD) demonstrating the agreement of both methods. However, there was some intraindividual variance between the scintigraphic and the angiographic study. The sensitivity and specificity in single regions with SPECT were lower compared to the global test results.(ABSTRACT TRUNCATED AT 250 WORDS)

Angiography↗

PubMed1989

[Determination of the right ventricular ejection fraction from the exponential decrease in the thermodilution curve--a comparison with biplanar cineventriculography].

Using the exponential downslope of the thermodilution curve right ventricular ejection fraction and volumes can be calculated. To evaluate the accuracy of this method for clinical application thermodilution measurements were compared to the results of biplane cineventriculography in 40 patients. Mean right ventricular ejection fraction was 52 +/- 9% determined by thermodilution (Th), and 53 +/- 8% determined by angiography (A). Mean enddiastolic volume was 189 +/- 74 ml (Th) and 162 +/- 42 ml (A) and mean endsystolic volume 92 +/- 42 ml (Th) and 75 +/- 20 ml (A). Ejection fraction of thermodilution measurements correlated with the results of angiography (r = 0.59; SEE = 7%; % SEE = 13 rel. %; p less than 0.001). The correlation for endsystolic volume was: r = 0.50; SEE = 36 ml; % SEE = 48%; p less than 0.001, and for enddiastolic volume: r = 0.36; SEE = 70 ml; % SEE = 43%; p less than 0.05. The differences in ejection fraction calculated by the two different methods were especially high (up to 25%) in patients (n = 10) with low (less than 110 ml) or high (greater than or equal to 200 ml) enddiastolic volume. For the other 30 patients the correlation for right ventricular ejection fraction was: r = 0.82; SEE = 5%; % SEE = 9 rel. %; p less than 0.001. Thus, the thermodilution method allows an approximative assessment of right ventricular ejection fraction only in patients with a normal right ventricle. Since right ventricular ejection fraction cannot be determined with sufficient accuracy in patients with right ventricular dilatation, the clinical application of this method is limited.

Cardiac Output↗

PubMed1989

[Incidence and concomitant factors of tricuspid valve insufficiency in patients with aortic and mitral valve diseases].

Invasive data about the frequency and associated factors of tricuspid regurgitation in normals and in patients with aortic and mitral valve disease are still rare. Thus, right ventricular biplane angiograms (RAO/LAO projection), the mean pulmonary artery pressure and the presence of atrial fibrillation were analyzed with regard to tricuspid regurgitation in 30 normals and 165 patients with pure mitral regurgitation, mitral stenosis, aortic regurgitation, aortic stenosis, combined mitral valve disease or combined aortic valve disease. Patients with tricuspid stenosis or coronary artery disease were excluded. In 52 of the 195 patients tricuspid regurgitation was present. Tricuspid regurgitation occurred statistically more often in patients with mitral stenosis (33%), mitral regurgitation (48%) or combined mitral valve disease (68%) than in patients with aortic regurgitation (4%) or combined aortic valve disease (3%). In patients with aortic stenosis and in normals tricuspid regurgitation was not present. In patients with combined mitral valve disease, tricuspid regurgitation was more often present than in patients with pure mitral stenosis (p less than 0.002), despite comparable values of the mean pulmonary artery pressure, the right ventricular enddiastolic and endsystolic volume indexes, the right ventricular ejection fraction and the frequency of atrial fibrillation. Only in patients with pure mitral regurgitation tricuspid regurgitation was associated with an elevated mean pulmonary artery pressure (p less than 0.02). Differences in the right ventricular size and function did not occur between normals and patients with mitral or aortic valve disease. Therefore, the mean pulmonary artery pressure, atrial fibrillation and the size and function of the right ventricle are not major determinants for the occurrence of tricuspid regurgitation.(ABSTRACT TRUNCATED AT 250 WORDS)

Aortic Valve↗

PubMed1989

[Function of the right ventricle in patients with mitral valve diseases].

To investigate right ventricular function in mitral valve disease, biplane cineventriculograms of the right and left ventricle were performed in 96 patients-35 with mitral stenosis, 26 with mitral regurgitation, 12 with combined mitral valve disease, 14 with mitral stenosis and tricuspid regurgitation, and nine with mitral regurgitation and tricuspid regurgitation, compared to 18 normals (N). Right ventricular enddiastolic volume index was moderately elevated in patients with mitral stenosis and concomitant tricuspid regurgitation (111.6 +/- 35.3 ml/m2, no significance compared to N: 95.9 +/- 21.8 ml/m2) and with mitral regurgitation and tricuspid regurgitation (107.9 +/- 45.1 ml/m2, no significance compared to N). A reduced right ventricular ejection fraction (RVEF less than or equal to 50%) was found in 40 of the 96 patients. Right ventricular ejection fraction was frequently reduced in patients with mitral regurgitation and tricuspid regurgitation (46.7% +/- 15.1%) and significantly reduced in patients with combined mitral valve disease (45.0 +/- 17.6%, compared to N: 58.0 +/- 7.1%, p less than 0.01). No significant correlations were found between right ventricular ejection fraction and left ventricular enddiastolic volume or left ventricular ejection fraction in patients with mitral valve disease. Moreover, right ventricular ejection fraction did not correlate with systolic pulmonary artery pressure, mean pulmonary artery pressure or mean pulmonary capillary wedge pressure. Local wall motion (mean systolic shortening) was determined for the anterior, anteroapical, and inferior segment in the RAO-projection and for the right ventricular free wall in the LAO-projection. 63% of the patients (n = 25) with reduced right ventricular function (RVEF less than of equal to 50%) showed local wall motion abnormalities, preferably in the anterior segment of the RAO- projection (48%) and the right ventricular free wall (30%).(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗

PubMed1988

[Interobserver comparison of quantitative analysis of local wall function of the left ventricle in stress cineventriculography].

During diagnostic heart catheterization biplane cineventriculograms of 46 patients at rest and directly after bicycle ergometry (72.8 +/- 27.8 W) were performed. The aim of the study was to determine the value of local wall motion analysis under physical exercise. Therefore two observers independently analyzed global and local left ventricular parameters. 38 patients had coronary artery disease, 23 with a history of myocardial infarction. Enddiastolic (EDV) and endsystolic volume (ESV) were evaluated and ejection fraction (EF) was calculated. Local wall motion was analyzed using a radial model with 60 radii in the 30 degrees RAO- and 60 degrees LAO-Projektion. A systolic segmental shortening was determined for the anterobasal (AB), anterolateral (AL), apical (AP), diaphragmatic (DP), posterobasal (PB) (30 degrees-RAO), septal (SE) and posterolateral (PL) area (60 degrees-LAO). Global functional parameters (EDV, ESV, EF) revealed good correlations between both observers with correlation coefficients (r) varying from 0.83 to 0.92. Local wall motion had sufficient correlations (r) at rest and during exercise (data in brackets) in the RAO-projektion: AB: 0.88 (0.73), AL: 0.69 (0.72), AP: 0.82 (0.78), DP: 0.77 (0.75), PB: 0.78 (0.78) and in the septal segment (LAO-projection): 0.69 (0.71). Less sufficient correlations were found in the posterolateral segment (LAO, especially at rest: 0.50 (0.69). Thus, global ventricular parameters can be determined at rest and during exercise independently of the observer. Local wall motion, too, can be quantified with sufficient accuracy with exception of the posterolateral area in the LAO-projektion.

Cardiac Output↗

PubMed1988

[Value of 2-D echocardiography in the detection of stress-induced wall-motion abnormalities in coronary heart disease--a comparison with biplane cineventriculography].

To determine the accuracy of echocardiography in assessment of exercise-induced wall motion abnormalities, the results of stress-echocardiography were compared with exercise-cineventriculography. In 56 consecutive patients biplane cineventriculography at rest and immediately after supine bicycle exercise was performed. Cross-sectional echocardiography was obtained using the apical 2- and 4-chamber view for LV imaging under identical exercise conditions. In 6 of the 56 patients 2-D echo, in 8 patients LV-angio, and in 2 patients both methods were of inadequate quality during exercise. Thus, in 40 patients (34 patients had coronary artery disease) local wall motion of 360 wall segments was analysed. 49 segments (14%) of 24 patients showed exercise-induced ischemic wall motion abnormalities during cineventriculography. Only 24 of these 49 asynergics (49%) were also detected by 2-D-echo. Using cross-sectional echocardiography, ischemia related wall motion abnormalities were best detected laterally and septaly, whereas apical asynergies were identified in 3 of 12 segments only. Thus, the clinical value of exercise 2-D echo as a screening method in patients suspected to have coronary artery disease is limited and restricted to patients with excellent visualization of the left ventricular endocardium.

Cineangiography↗

PubMed1988

Determination of right ventricular ejection fraction by thermodilution technique--a comparison to biplane cineventriculography.

Determination of right ventricular ejection fraction (RVEF) provides information about global right ventricular function, which may be important for the management of patients with various heart diseases. Right ventricular ejection fraction can be determined by new thermodilution techniques using fast-response thermistors. To evaluate the validity of these methods, thermodilution measurements were compared with biplane cineventriculography in 22 patients undergoing cardiac catheterization. In all patients standard deviation of RVEF was below 5%. Mean RVEF, determined by thermodilution, was 52% +/- 9%, ranging from 32% to 71% and correlated significantly with the results of angiography (RVEF: 52% +/- 9%) (r = 0.80, SEE +/- 5%, n = 22, p less than 0.001). Correlation was good especially in patients with small right ventricles (less than 160 ml) (r = 0.91, SEE +/- 5%, n = 13, p less than 0.001), lower heart rates (less than 65/min) (r = 0.84, SEE = +/- 6%, n = 12, p less than 0.001) and cardiac output below 5.51/min (r = 0.88, SEE +/- 6%, n = 11, p less than 0.001). Thus, if valid catheter placement is possible, right ventricular ejection fraction can be determined by thermodilution technique with good reproducibility and sufficient accuracy compared to biplane angio. Validation of this method in larger patient populations with various heart diseases is necessary.

Aged↗

PubMed1988

[Effect of tricuspid annuloplasty in mitral/aortic valve replacement on the clinical aspects and global function of the right heart chamber].

The clinical improvement after mitral or aortic valve surgery is primarily due to the correction of the aortic/mitral valve function and the subsequent decrease of pulmonary artery pressure. The hemodynamic effect of an additional tricuspid annuloplasty, however, is still unclear. To assess the influence of a tricuspid annuloplasty using DeVega- or Carpentier-technique on the clinical outcome, hemodynamics, and right ventricular function in patients with moderate to severe tricuspid insufficiency, 38 patients were studied pre- and 11 +/- 4 months postoperatively. The clinical degree of left heart failure was graded according to the criteria of the NYHA. The extent of right heart failure (RHF) was determined using a clinical score from 0 (no signs) to 3 (severe RHF with pleural effusion/ascites). Mean pulmonary artery pressure (PAPm), end-diastolic volume index (RVEDVI), and ejection fraction (RVEF) of the right ventricle using biplane cineventriculography, as well as the angiographic and dopplerechocardiographic degree of tricuspid insufficiency were determined. The patients were assigned to three groups: gr.I (n = 12): preoperatively no tricuspid insufficiency (TI), gr. II (n = 12): with preop. TI and without tricuspid annuloplasty (TA), gr. III (n = 14): with preop. TI and TA. The patients of all three groups improved postoperatively from NYHA functional class III to class II (p less than 0.001). The clinical score of RHF decreased from 0.8 +/- 0.5 to 0.3 +/- 0.5 in gr. I, from 1.4 +/- 1.1 to 0.6 +/- 0.7 in gr. II, and from 1.7 +/- 1.0 to 0.8 +/- 0.8 in gr. III (p less than 0.02).(ABSTRACT TRUNCATED AT 250 WORDS)

Aortic Valve↗

PubMed1988

[Post-traumatic aneurysm of the right ventricular outflow tract with concomitant tricuspid valve insufficiency].

Right ventricular aneurysms of different etiology are rare findings. Aneurysms of traumatic origin after penetrating accidents are reported. After nonpenetrating traumas formation of a right ventricular aneurysm, however, has not yet been reported. This case report deals with a 25-year-old patient who developed an aneurysm of the right ventricular outflow tract and tricuspid regurgitation after a nonpenetrating chest trauma. Clinical, hemodynamic, and echocardiographic findings with a follow up for 18 months demonstrate excellent adaptation to the traumatic changes. Therapeutic consequences are discussed with respect to the literature and prognosis.

Adult↗

PubMed1988

[Detection of ischemia with thallium-201 single photon emission computerized tomography (SPECT) and radionuclide ventriculography in comparison with stress cineventriculography].

The accuracy of radionuclide techniques for detection of exercise-induced myocardial ischemia was analyzed with TL-201 single-photon emission computer tomography (SPECT) and gated blood pool ventriculography in 31 patients. Reversible and persistent perfusion defects in the biphasic SPECT studies, parametric phase and amplitude images and global indices of left ventricular function were evaluated and compared to the results of exercise cineventriculography. Out of 25 patients with coronary heart disease, 20 had exercise-induced ischemia and 17 patients had a prior myocardial infarction. SPECT detected ischemia with a sensitivity of 85% and a specificity of 100%, gated blood pool ventriculography had a sensitivity of 60% and a specificity of 91%. Both scintigraphic methods were comparable in the detection of myocardial infarcts (SPECT/gated blood pool ventriculography: sensitivity 88%/82%; specificity 100%/93%; positive predictive value 100%/93%). A difference in detection of ischemia between both methods was found in patients with myocardial infarct and additional ischemia: all patients with additional ischemia were detected by SPECT, whereas gated blood pool ventriculography failed to identify the additional ischemia in 1/4 of these patients (p less than 0.05).

Cardiac Output↗

PubMed1988

[Quantitative segmental analysis of wall function of the right ventricle in probands with healthy hearts].

To investigate and determine the local wall motion of normal right ventricles, biplane angiograms from 14 normal subjects were analyzed. In all patients, organic heart disease was excluded by angiography and right heart catheterization under exercise. Using a radial model, segmental systolic area shortening was determined for the anterior, anteroapical and inferior segment in the RAO-projection and the inferior, anteroapical and anterior (free wall) segment in the LAO-projection. The highest segmental shortening was found for the anterior wall in the RAO-projection (45.6 +/- 7.8%) and for the free wall in the LAO-projection with 42.7 +/- 11.3% (RAO: anteroapical 28.1 +/- 6.3%; inferior: 26.5 +/- 7.8%. LAO: anteroapical: 34.7 +/- 18.8%; inferior: 30.6 +/- 21.6%). Corresponding to these different segment shortenings, right ventricular contraction seems to have a disharmonic pattern in comparison to the left ventricle. Normal local wall motion of segmental area shortening was predicted by the means-2SD (95.5%) confidence interval. The confidence interval of the inferior (-12.6%) and anteroapical (-2.9%) segment in the LAO-projection was poor compared to the other segments (RAO: anterior 30.0%; anteroapical 15.5%; inferior: 10.9%; LAO: free wall: 20.1%). For the LAO-inferior and LAO-anteroapical segment, even akinesia was within the 95.5% confidence interval. In conclusion, quantification of local wall motion seems possible with reasonable confidence for RAO segments and the free wall in the LAO-projection only.

Aged↗

PubMed1987

[Effect of volume load of the left ventricle in aortic and mitral insufficiency on the geometry and function of the right ventricle].

To investigate the effect of chronic left ventricular enlargement on right ventricular geometry and function, biplane cineventriculograms were analyzed in 23 patients with aortic regurgitation (AR) and in 17 patients with mitral regurgitation (MR). Left ventricular end-diastolic volume indices (LVEDVI) were elevated and significantly (p less than 0.05) different in patients with aortic regurgitation (AR) (190.2 +/- 65.2 ml/m2) and mitral regurgitation (MR) (148.7 +/- 40.1 ml/m2). Right ventricular end-diastolic volume indices (RVEDVI), however, were comparable and within the normal range (AR: 96.6 +/- 18.3 ml/m2, MR: 100.2 +/- 33.7 ml/m2). Mean pulmonary artery pressure was significantly (p less than 0.05) higher in patients with mitral regurgitation with 24.7 +/- 12.8 mm Hg (AR: 17.5 +/- 6.6 mm Hg). Six patients with mitral insufficiency had concomitant tricuspid valve insufficiency. In five out of six patients with tricuspid insufficiency, right ventricular afterload was significantly elevated. Only in patients with mitral regurgitation was a significant correlation (r) between left and right ventricular end-diastolic volume index found (RVEDVI = 0.7 X LVEDVI +1, r = 0.80). Moreover, in patients with MR, left ventricular end-diastolic volume index correlated with right ventricular end-systolic volume index (RVESVI = 0.4 X LVEDVI -8, r = 0.73). Right ventricular ejection fraction was significantly different (p less than 0.05) between patients with aortic and mitral insufficiency (AR: 53.7 +/- 8.9%, MR: 46.7 +/- 10.7%). Particularly in patients with normal left ventricular ejection fraction (greater than 50%) and mitral regurgitation, the incidence of a reduced right ventricular ejection fraction (less than 50%) was significantly higher (p less than 0.01) compared to patients with aortic regurgitation.(ABSTRACT TRUNCATED AT 250 WORDS)

Aortic Valve Insufficiency↗

PubMed1986

[Bicoronary-pulmonary fistula with aneurysms of the left coronary artery].

Bicoronary-pulmonary fistulae are extremely rare cardiac malformations with only ten cases reported. We describe the case of a 46-year-old woman who was referred to our hospital because of a continuum of subfebrile temperature between 37 and 39 degrees C. On chest X-ray there were no signs of right ventricular volume overload or pulmonary congestion, the electrocardiogram showed no abnormalities. Auscultation revealed a 3/6 systolic-diastolic murmur with maximal intensity in the second and third intercostal space at the left parasternal border. At catheterization a coronary-pulmonary fistula of the left coronary artery at the end of the proximal third of the anterior descending branch with an aneurysm of the left main coronary artery and the proximal part of the anterior descending artery was found. Additionally an abnormal conal branch of the right coronary artery was found draining into a venous convolute around the pulmonary artery stem. A left-to-right shunt of 15 percent was calculated. To our knowledge this is the first case report of such a combination of a bicoronary-pulmonary fistula.

Aneurysm↗