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Biomedical subjects

H Dalichau

Publications and source records attributed to H Dalichau.

At least 127 records · Page 7Linked to original sources
PubMed1976

[Performance of the Lillehei-Kaster-prosthesis. A critical haemodynamic study (author's transl)].

11 patients were studied 6 to 12 months after aortic valve replacement with Lillehei-Kaster-prosthesis (LKP). We found pressure gradients (deltaP) at rest of 31 mmHg (7 to 52 mmHg), 37 mmHg (8 to 69 mmHg during exercise and 8 mmHg during ventricular pacing delta P was influenced by stroke volume and valve size, but not by the width of the aorta. The opening angle alpha of the disc was only 62degrees and depended on stroke volume and on the orientation of the value within the aorta. The blood passed the valve ring only through the larger part of the orifice, the opening area was only 50% of the given area. Thus in practice the LKP does not perform to manufacturers specification.

Aortic Valve↗
PubMed1976

[Clinical and hemodynamic evaluation on the functional performance of the Starr-Edwards low profile valve prosthese in mitral position (author's transl)].

205 patients with isolated mitral valve replacement using the Starr-Edwards low profile valve prostheses (model 6520 and 6550) were followed 3 to 67 months (mean of 30,4 months) after surgery. While these prostheses seems to reliable substitutes with regard to functional performance and to mechanical dysfunction, postoperative hemodynamic investigation revealed significant diastolic pressure gradients across the valve as well as reduction in functional mitral valve area relative to pulse and stroke volume. The incidence of thromboembolism was comparable to other artificial valves.

Blood Pressure↗
PubMed1976

[Indications for surgery of the coronaries and its results (author's transl)].

In chronic angina pectoris surgery is indicated for all patients with bridgeable central stenoses, suitable distal vessels and patent peripheral coronary circulation, if function of the ventricle is not critically reduced. when more than one vessel is diseased and with isolated stenoses of the anterior interventricular branch of the left coronary a., it does hardly latter whether the angina pectoris can be treated conservatively or not. An absolute indication for revasculariation exists when stenoses of the main branches of the left coronary artery can be shown. Pre-infarct angina (unstable or crescendo-angina, threatened infarction) should, in younger patients, always lead to immediate diagnostic ascertainment. Where severe anatomic coronary changes are present, immediate surgery is indicated, although the real danger of infarction in such patients cannot be reliably predicated as yet. Post-infarct ventricular aneurysmus should be operated on when leftsided insufficiency increases or arrythmias cannot be controlled satisfactorily any more. Surgery can be undertaken with an acceptable risk, if patients are carefully selected. As far as we know from published statistics, the quality of life of such patients can be improved for some time. But their expectation of life after surgery cannot as yet be reliably predicted, because prospective observations of comparable groups of patients treated conservatively or surgically do not yet exist. From a prospective study of McNeer (22) it appears that in 2 randomized groups there was no significant difference in time of survival after 2 years. Neither the size of the material nor the period of follow-up are sufficient for definite evaluation.

Acute Disease↗
PubMed1975

[Heart valve surgery in bacterial endocarditis (author's transl)].

Bacterial endocarditis was the cause of heart valve destruction in 23 patients. Additional 5 patients were reoperated because of an infected valve prothesis. 13 were operated upon during the inactive stage. Nevertheless infection recurred after operation at least in one patient. 10 patients underwent operation during the active stage, 6 of these with stable cardiac function, 4 in cardiogenic shock. Hospital mortality was 2/6 and 1/4 respectively. One patient died after three months of persisting infection. Three of five patients with infected valve prosthesis survived reoperation. An attempt is made to define the indication for valve surgery in bacterial endocarditis.

Adolescent↗
PubMed1975

Complications of permanent transvenous cardiac pacing.

Clinical experience with permanent transvenous pacing during a 6 year period at Hannover Medical School is presented. A total of 1,376 pacemaker operations were performed in 799 patients, with a mortality rate of 1.1 per cent. The most common complications were premature battery failure, dislocation of endocardial electrodes, infections of the generator and/or electrodes, and skin ulcerations. In our cumulative follow-up period of 1,225 years, a complication necessitating a reoperation is to be expected after an average function-time of 31 months. Including normal battery exhaustion in this calculation will make reoperation necessary every 21.9 months.

Adult↗