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Biomedical subjects

A Aigner

Publications and source records attributed to A Aigner.

At least 55 records · Page 3Linked to original sources
PubMed1978

[Echocardiographic determination of left ventricular function during isometric muscle exertion and the Valsalva maneuver].

Left ventricular dimensions and function were estimated in 11 healthy volunteers by means of echocardiography during isometric exercise and the Valsalva manoeuvre. Isometric exercise induces a rise of heart rate and Vcf by 14% and of cardiac output as well as of the cardiac index by 12%. Stroke volume remains unchanged. During Valsalva's manoeuvre a marked decrease in left ventricular dimensions is observed. A reduction of the stroke volume by 29% was not compensated by increasing heart rate. However, cardiac output and cardiac index is found 10% below control values.

Adult↗
PubMed1977

[Contoursonagraphic analysis of heart sound phenomena and sounds produced by various heart valve prostheses].

The normal heart sounds, murmurs, opening and closing sounds of aortic and mitral valve prostheses were recorded on a tape and analyzed in terms of contour sonagrams in order to obtain the highest frequencies which were recordable on the chest wall. The peak frequencies showed a broad range, the maximum beeing reached at about 8000 c.p.s. in the case of the sounds of prosthetic valves. Furthermore, sound level examinations of the normal first and second heart sound, as well as of the opening and closing sounds of the aortic valve prostheses were performed. The highest sound level of all of these sounds was found to lie within the low frequency range of 40 to 100 c.p.s.

Aortic Valve Insufficiency↗
PubMed1977

[Myocardial performance during therapeutic starvation in obese subjects].

The effect was studied of therapeutic total starvation of two weeks' duration on myocardial performance in 12 obeses patients. Half of these subjects were trained for 10 minutes daily on a bicycle ergometer, whilst the other half had no training. After two weeks of total fasting no significant changes were observed either inter- or intracollectively with regard to systolic time intervals, ejection fraction and the index of myocardial contractility, nor in respect to serum electrolytes. Physical training had no influence on the systolic time intervals and the other noninvasive parameters of left ventricular performance. The inclusion of previous data obtained in a similar investigation enabled the establishment of a correlation between the serum potassium level and the ejection franction.

Adult↗
PubMed1976

[Left ventricular function at rest and during dynamic load before and after aortocoronary bypass. Preliminary report].

17 patients with coronary artery disease were studied before and 10 +/- 3 months (mean +/- 1 SD) after aortocoronary bypass surgery. Left ventricular performance was analyzed at rest and in 12 cases during dynamic exercise (work load 59 +/- 22 watts) with tip manometer pressure measurements. The degree of coronary artery obstruction was estimated pre- and postoperatively by vascularization index (VaI). Patients were separated into 2 groups (group A: 8 patients with postoperatively improved VaI, and group B: 9 patients with unchanged or worsened VaI). Apart from a significant fall in LVEDP (p less than 0.025) in group A, there was no significant change in left ventricular dynamics in either group at rest, while a significant improvement in mean LVEDP (p less than 0.05), max dP/dt (p less than 0.05), Vpm (p less than 0.005) and Vmax (p less than 0.005) during dynamic exercise was observed in group A, but no significant change in these terms in group B, after surgery.

Coronary Artery Bypass↗
PubMed1976

[Haemodynamics at rest and exercise capacity of patients treated by intermittent haemodialysis (author's transl)].

The haemodynamics at rest of 10 patients (mean age 42.6 years) with terminal renal failure treated by intermittent haemodialysis were studied over a period of 8 to 22 months by non-invasive methods. Additionally bicycle exercise testing was performed. After 13 months there was a reduction in cardiac index from 3.37 +/- 0.75 L/Min./m2 to 2.94 +/- 0.51 L/Min./m2 (p less than 0.05) and of the left ventricular minute work index from 6.21 +/- 1.60 mkp/Min./m2 to 5.71 +/- 1.36 mkp/Min./m2 (p less than 0.02). The blood pressure, index of peripheral resistance, systolic time intervals, arm-ear time and the ejection fraction showed no significant variations. Left ventricular failure was not detectable at rest, but the work capacity on exercise testing was reduced during the entire period of investigation without significant variation.

Adult↗
PubMed1976

[Sound spectrographic investigations of heart sounds and murmurs and of the sounds produced by artificial valves (author's transl)].

The normal heart sounds, murmurs, opening and closing sounds of aortic and mitral valve prostheses were recorded on a tape in order to obtain the highest frequencies which were recordable on the chest wall. Sections of these tapes were analyzed in terms of contour sonagrams. For this purpose six groups were formed and investigated: group I comprised persons without cardiovascular diseases, group II patients with mitral valve failure, group III patients with aortic valve failure, group IV patients with congenital heart disease, group V patients with Starr-Edwards aortic valve prostheses (model 1260) and group VI patients with various mitral valve prostheses. In each of these groups the highest recordable frequencies were measured. The peak frequencies varied widely in regard to frequency range in a comparison of the six groups. The maximum was reached at about 8000 c.p.s. in the case of the sounds of prosthetic valves. Furthermore, sound level examinations of the normal first and second heart sounds, as well as of the opening and closing sounds of the aortic valve prostheses were performed. The highest sound level of all of these sounds was found to lie within the low frequency range of 40 to 100 c.p.s. The results of both the measurements of the peak frequencies and of the maximal sound level were discussed on the basis of the presently accepted theories on the mechanism of heart sounds and murmurs.

Aortic Valve↗
PubMed1975

[Proceedings: Clinical findings and coronary morphology before and after aorto-coronary venous bypass].

37 patients (mean age 51+/-8 years) were clinically and angiographically investigated before and 11+/-5 months after implantation of an aortocoronary vein graft. The rate of bypass patency was 78%. Postoperatively 57% of the patients were free of symptoms, 35% were improved and 8% unimproved or worse. The reduced incidence of angina pectoris during exercise testing appears to be correlated with graft patency, an improved vascularization index and probably the absence of preoperative myocardial infarction. The systolic time intervals and the lung-ear time at rest are of no value for differentiation of improved and unimproved patients.

Adult↗
PubMed1975

[Clinical observations and angiographic findings before and after aortocoronary benous bypass grafting (author's transl)].

37 patients (mean age 51 +/- 8 years) were investigated clinically, mechanocardiographically and angiocardiographically before and 336 +/- 166 days after implantation of an aortocoronary vein graft. The bypass patency rate was 78%. Postoperatively 57% of the patients were free of symptoms, 35% were improved and 8% unimproved or worse. The postoperative incidence of angina pectoris during exercise testing was significantly lower in the groups with an improved vascularization-index, open vein grafts and a lack of preoperative myocardial infarction. For separating the patients only the vascularization-index and the bypass patency seem to be of value.

Adult↗