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Biomedical subjects

D Durrer

Publications and source records attributed to D Durrer.

At least 19 recordsLinked to original sources
PubMed2005

Healthy diet in primary care: views of general practitioners and nurses from Europe.

BACKGROUND: Most of the national colleges of general practitioners (GPs) do not have their own dietary/nutritional tools, and GPs and nurses do not have the time, knowledge, or skills to advise their patients about desirable dietary practices. OBJECTIVE: To assess the usefulness of a simple and practical guide on healthy diet to be used by European GPs and nurses. DESIGN: A postal survey was mailed to 171 GPs and nurses from 12 European countries to obtain information about the usefulness of a guide on healthy diet developed by EUROPREV. RESULTS: The perception of health professionals is that the main source of information on healthy diet for the population was the media. In all, 95% of GPs and nurses reported that the guide was useful; 93, 95, and 82% reported that the concepts were concise, easy to understand, and realistic, respectively. Also, 77% reported that the type of counselling recommended was feasible and could be applied, 94% reported that the implementation measures proposed could be effective and 88% reported that the Traditional Mediterranean Diet Pyramid is useful, but some concerns about the content were mentioned. CONCLUSIONS: GPs and nurses from Europe think that a practical guide on healthy diet developed by EUROPREV could be used to advise patients in primary care, although the Traditional Mediterranean Diet Pyramid should be modified.

Adult↗
PubMed2002

A new accelerometric method to assess the daily walking practice.

OBJECTIVE: To describe a method to obtain a profile of the duration and intensity (speed) of walking periods over 24 hours in women under free-living conditions. DESIGN: A new method based on accelerometry was designed for analyzing walking activity. In order to take into account inter-individual variability of acceleration, an individual calibration process was used. Different experiments were performed to highlight the variability of acceleration vs walking speed relationship, to analyze the speed prediction accuracy of the method, and to test the assessment of walking distance and duration over 24-h. SUBJECTS: Twenty-eight women were studied (mean+/-s.d.) age: 39.3+/-8.9 y; body mass: 79.7+/-11.1 kg; body height: 162.9+/-5.4 cm; and body mass index (BMI) 30.0+/-3.8 kg/m(2). RESULTS: Accelerometer output was significantly correlated with speed during treadmill walking (r=0.95, P<0.01), and short unconstrained walks (r=0.86, P<0.01), although with a large inter-individual variation of the regression parameters. By using individual calibration, it was possible to predict walking speed on a standard urban circuit (predicted vs measured r=0.93, P<0.01, s.e.e.=0.51 km/h). In the free-living experiment, women spent on average 79.9+/-36.0 (range: 31.7-168.2) min/day in displacement activities, from which discontinuous short walking activities represented about 2/3 and continuous ones 1/3. Total walking distance averaged 2.1+/-1.2 (range: 0.4-4.7) km/day. It was performed at an average speed of 5.0+/-0.5 (range: 4.1-6.0) km/h. CONCLUSION: An accelerometer measuring the anteroposterior acceleration of the body can estimate walking speed together with the pattern, intensity and duration of daily walking activity.

Acceleration↗
PubMed1986

[Disease (Lyme disease) in pediatric patients in Switzerland caused by spirochetes (Borrelia burgdorferi) of Ixodes ricinus].

Lyme disease in children is studied in the light of questionnaires sent out twice to departments and divisions of pediatrics in Switzerland. Thirty-six serologically proven cases were collected. The 48 clinical signs attributed to Lyme disease involved the skin in 40%, the nervous system in 40%, and the joints in 20%. They were erythema chronicum migrans (13), lymphocytoma (4), acrodermatitis chronica atrophicans (2), peripheral facial palsy (14), sensomotor radiculoneuritis (2), meningoencephalitis (3) and arthritis (10, 7 of which were monoarthritic). Only half the patients had a history of tick-bite. Antibiotic therapy, usually with penicillin, reduced both the duration of symptoms and frequency of secondary disease. Cardiac involvement and chronic stages with residua were not observed in this series.

Adolescent↗
PubMed1985

Effects of unilateral stellate ganglion stimulation and ablation on electrophysiologic changes induced by acute myocardial ischemia in dogs.

We recorded direct-current extracellular electrograms simultaneously from 60 left ventricular epicardial sites in 38 alpha-chloralose-anesthetized dogs during repeated, 5 min coronary arterial occlusions. In each dog recordings made during control occlusions were compared with those made in occlusions after, or during, the following interventions on the sympathetic nervous system: left stellate ganglion stimulation, left stellectomy, right stellectomy, and clamping the abdominal aorta with intact sympathetic nerves to induce a rise of blood pressure equal to that present during left stellate stimulation. Heart rate was kept constant. Measurements included determination of TQ segment potentials and times of local activation. After 2 min of ischemia, the degree of TQ segment depression was increased by left stellate ganglion stimulation and was decreased by both left stellectomy and clamping the aorta. Also, the area showing negative TQ potentials, indicating decreased resting membrane potentials, was enlarged by both left stellate stimulation and right stellectomy and reduced by left stellectomy. No differences were found in the results of experiments in which the left anterior descending coronary artery was occluded and those in which the circumflex branch was occluded. Left stellate stimulation significantly improved conduction within the ischemic zone. No evidence was found to suggest that the arrhythmogenic effects of left stellate stimulation and of right stellectomy, confirmed in the present study, resulted from an increased likelihood for reentry in the subepicardium of the ischemic zone.

Animals↗
PubMed1984

Combined effects of hypoxia, hyperkalemia and acidosis on membrane action potential and excitability of guinea-pig ventricular muscle.

The effects of hypoxia (with and without acidosis) on membrane action potentials and recovery kinetics of their upstroke velocity (Vmax) were studied in isolated guinea-pig papillary muscles at various extracellular K+ concentrations. At 5 mM [K+]0, hypoxia (hypoxic and glucose-free perfusate) at pH 7.4 caused a progressive shortening of action potential duration and a slight decrease in Vmax and resting potential. The recovery kinetics of Vmax assessed by premature stimuli were not affected by hypoxia. At high [K+]0 of 10 or 12 mM, hypoxia caused a marked decrease in Vmax, while the shortening of the action potential and the decrease in resting potential were similar to those at 5 mM [K+]0. However, the recovery kinetics of Vmax were markedly slowed by hypoxia. When hypoxia was added in the presence of mild acidosis (pH 6.8), the shortening of the action potential due to hypoxia was appreciably less. However, other hypoxia-induced changes in action potential and in recovery kinetics of Vmax under normal and high [K+]0 were not influenced by the concomitant acidosis. These results show that the depressant effect of hypoxia on the action potential upstroke and on the recovery of excitability of ventricular myocardium is increased when the muscles are partly depolarized at high K+. Slight differences in extracellular K+ in the presence of hypoxia have a marked effect on the time course of recovery of excitability. This inhomogeneity in refractoriness could be important for the occurrence of re-entrant arrhythmias in ischemic myocardium.

Acidosis↗
PubMed1984

Early two-dimensional echocardiographic measurement of left ventricular ejection fraction in acute myocardial infarction.

Left ventricular volume and ejection fraction were measured by 2-dimensional echocardiography from 2 orthogonal apical long axis views in 90 patients admitted with acute transmural myocardial infarction. Results were correlated with worst Killip class during hospital stay, enzymatic infarct size (peak CK-MB) and mortality. We used two algorithms, a biplane area-length algorithm and a modification of Simpson's rule. Both algorithms yielded essentially the same results: there were statistically significant trends towards higher end-diastolic and end-systolic volumes and lower ejection fraction with higher Killip -class. Ejection fraction was lower (P less than 0.01) in the 6 patients dying from cardiogenic shock (28.0 +/- 7.8% v. 46.6 +/- 10.1% in survivors with the area--length algorithm; 28.1 +/- 6.2% v. 48.1 +/- 10.2% with modified Simpson's rule). In 5 patients dying from other causes ejection fraction was 46.0 +/- 14.9% with the area-length method or 46.2 +/- 14.5% with Simpson's rule (not different from survivors). Correlation with peak CK-MB was only modest, though statistically significant: the regression equation was: y = -0. 39x + 54 (r = -0.35; P less than 0.01) with the area-length method; and y = -0. 41x + 55 (r = -0.37; P less than 0.01) with Simpson's rule. Left ventricular ejection fraction measured at the bedside in patients with acute myocardial infarction, can provide useful clinical information. Patients likely to develop shock can be identified shortly after admission.

Aged↗
PubMed1984

Serial left ventricular ejection fraction in acute myocardial infarction by cross-sectional echocardiography: correlation of changing ejection fraction with clinical course.

Left ventricular volume and ejection fraction were measured in 22 survivors of acute myocardial infarction by means of two-dimensional echocardiography and using a Simpson's rule algorithm. Ten of the 22 patients experienced complications. For the group as a whole, there were no significant trends in left ventricular volume and ejection fraction between the first and third days and the third month after infarction. In the subgroups with uncomplicated and complicated infarction, there were trends towards increasing and decreasing ejection fractions, respectively, which failed to attain statistical significance, however. The difference in ejection fraction between both subgroups had become significant at 3 months; 55.2 +/- 11.1% in uncomplicated v. 41.3 +/- 6.9% in complicated cases (P less than 0.01). Individual changes in ejection fraction falling outside the limits of reproducibility of the method as assessed previously were observed between day 1 and day 3 in only 2 patients with uncomplicated and in 2 patients with complicated infarction. Between day 1 and 3 months such changes occurred in 8 patients with uncomplicated infarction (upward in 5 and downward in 3), and in 8 patients with complicated infarcts (upward in 3 and downward in 5). We conclude that changes in ejection fraction as measured by two-dimensional echocardiography tend to correlate with complications.

Aged↗
PubMed1984

Measurement of left ventricular ejection fraction after acute myocardial infarction. A serial cross sectional echocardiographic study.

Left ventricular ejection fraction was assessed by biplane cross sectional echocardiography in 65 patients with a first acute myocardial infarction on the first day. In 30 patients (group 1) measurements were repeated on the third day and in another 35 patients (group 2) at three months. Changes in ejection fraction of 0.05 or less were arbitrarily called insignificant. In group 1 only two patients showed a decrease of more than 0.1 between days 1 and 3, and both had an enzymatically confirmed infarct extension. The remaining patients had no complications. In group two 11 patients had decreases of more than 0.1 between day 1 and three months: three of them had an enzymatically confirmed reinfarction (perioperative in one) and four a possible reinfarction, and in two an angiographically confirmed left ventricular aneurysm developed. In two no complications occurred. The other complications that occurred were an enzymatically confirmed but small reinfarction, an angiographically confirmed but circumscript aneurysm, and an uncomplicated bypass operation in one patient each. These three patients had a small increase (between 0.05 and 0.1) in ejection fraction. Reproducibility of the method of measuring the ejection fraction was assessed concurrently in 20 outpatients with a previous myocardial infarction who were studied twice on the same day (with a 30 minute interval) by two different observers. The mean absolute difference in ejection fraction between the paired observations was 0.036 +/- 0.023 with a range of 0 to 0.07. Thus only changes in ejection fraction of more than 0.1 correlate with clinically recognised complications. Changes between 0.05 and 0.1 may be due to spontaneous variability or to the limited reproducibility of the method.

Adult↗
PubMed1984

Amiodarone pneumonitis: three further cases with a review of published reports.

Three further patients are presented who developed evidence of a parenchymal pulmonary disturbance in the course of treatment with amiodarone. In one case the progress of the condition was rapid and ended fatally. Histological examination of the lungs showed evidence of diffuse alveolar damage. The concentration of amiodarone was from four to seven times higher in the lungs than in other organs studied. The concentration of the metabolite desethylamiodarone in the lungs was even higher in relation to other organs studied. The remaining two patients showed a more insidious onset and improvement after withdrawal of amiodarone and treatment with corticosteroids. Gallium 67 scintigraphy appeared to be a sensitive indicator of this adverse effect. Review of published reports revealed 35 cases of amiodarone pneumonitis, including the cases reported in this study. In 11 instances the dose of amiodarone was 400 mg or less. The onset was either insidious or rapidly progressive. Exertional dyspnoea was always present and a nonproductive cough, hypoxaemia, a raised erythrocyte sedimentation rate and diminished carbon monoxide diffusing capacity (transfer factor) were usually noted. Chest radiographs showed either a reticular pattern or diffuse patchy alveolar infiltrates. Discontinuation of amiodarone and an institution of corticosteroid treatment was usually followed by improvement or resolution.

Adult↗
PubMed1984

Long-term follow-up of left ventricular thrombus after acute myocardial infarction. A two-dimensional echocardiographic study in 96 patients.

To determine the incidence, natural history, and relation to anticoagulant therapy of left ventricular thrombus (LVT) following acute myocardial infarction (MI), we performed two-dimensional echocardiography in 96 consecutive patients with isolated MI during the acute episode and after four and 12 months. Only patients with anterior MI received oral anticoagulant therapy on admission and throughout the study period. The LVT was identified in 21/65 patients with anterior and in 1/31 patients with inferior MI. The large majority of LVT cases were seen for the first time during the acute phase of MI. LVT was associated with a significantly higher peak value of CK-MB (118 +/- 24 vs 76 +/- 35, p less than 0.001) and Killip class (2.5 +/- 0.8 vs. 1.5 +/- 0.7, p less than 0.002). Patients with anterior MI and LVT more frequently had segmental dyskinesia during acute MI than patients without LVT (86 percent vs 18 percent, p less than 0.001). In four patients LVT resolved during the study period. Discontinuation of anticoagulant therapy in four patients with an aneurysm led to LVT formation in three. Two patients suffered a clinically recognized embolic event; one never had LVT demonstrated by echocardiography. Thus, LVT usually develops in the early days following large anterior MI, complicated by pump failure and segmental dyskinesia, even when patients receive oral anticoagulant therapy. Surprisingly, the incidence of embolic events was low (1/22) in our LVT patients.

Administration, Oral↗
PubMed1983

Effects of cardiac rehabilitation after myocardial infarction: changes in coronary risk factors and long-term prognosis.

Prognosis during 5 years of follow-up after first myocardial infarction (MI) in a group of men (aged 40 to 55 years) was related to risk factors determined at the time of MI. Progression of coronary artery disease (CAD) was measured by the occurrence of severe angina pectoris, recurrent myocardial infarction, and cardiac death. Only smoking and serum cholesterol level influenced prognosis. It was possible to identify a subgroup (patients smoking less than 20 cigarettes/day and having a cholesterol level of less than 7.0 mmoles/L) with low risk for progression of CAD. A randomly applied 6-week rehabilitation program shortly after MI was associated with a 50% decrease in progressive CAD when compared to the control group. Since only a slight decrease in cholesterol levels was found in the rehabilitation group, a direct effect of the rehabilitation program could thus not be excluded because the second important risk factor, smoking, did not show differences between the two groups. The smoking habits at the time of MI determined the continuation of cigarette smoking and rehabilitation did not influence smoking habits.

Adult↗
PubMed1983

Comparison of two-dimensional echocardiography with radionuclide angiography during dynamic exercise for the detection of coronary artery disease.

Two-dimensional echocardiography (2DE) was performed during 30-degree left lateral decubitus bicycle exercise in 52 patients who underwent cardiac catheterization for suspected coronary artery disease (CAD). Adequate echocardiograms were obtained in 39 patients (75%). Thirty-five of these patients underwent radionuclide angiography (RNA) with the same exercise protocol as for echocardiography. Exercise-induced or increased initial asynergy was considered to be a positive test by both 2DE and RNA. Echocardiographic, scintigraphic, and coronary angiographic data were compared to each other. Significant CAD (greater than 50% luminal obstruction) was present in 26 patients (66%). One of 15 patients with exercise-induced asynergy by 2DE had no CAD. Six 2DE and two RNA studies during exercise were falsely negative, sensitivity 76% versus 91%. Inclusion of RNA ejection fraction data would increase the sensitivity but decrease the specificity of RNA. Exercise-induced septal asynergy was far more frequently present by 2DE than by RNA (11 versus 6) in the 17 patients who had exercise-induced anterior asynergy by both methods. We conclude that it was possible to perform exercise 2DE in 75% of our patients. Exercise-induced asynergy on 2DE was specific (92%) for CAD. The sensitivity of 2DE in detecting CAD was less than that of RNA.

Adult↗
PubMed1983

Thallium-201 scanning to decide CCU admission in patients with non-diagnostic electrocardiograms.

To determine the value of thallium-201 scintigraphy as a decisive factor in admission policy for patients with acute chest pain and nondiagnostic electrocardiograms, we undertook a prospective study in 149 such patients. The interval between pain and scan never exceeded 12 hr. Of 57 patients in whom a defect was seen, 34 had an acute infarction, 7 developed infarction within 2 months, and in 11 coronary heart disease was proven by angiography or strongly suggested by stress tests (ECG and thallium-201 scan). In 13 patients with an equivocal scan, coronary heart disease was proven or strongly suggested in 5. Of 79 patients with a normal scan, only 1 had acute infarction, and stress tests were positive in 6 and negative in 72. In these 72 no cardiac event occurred during a 1-year follow-up. Thallium-201 scintigraphy can help to select those patients with acute chest pain and nondiagnostic electrocardiograms who need observation in a CCU.

Electrocardiography↗
PubMed1983

Endocardial mapping by simultaneous recording of endocardial electrograms during cardiac surgery for ventricular aneurysm.

A technique was developed for the simultaneous recording of 30 endocardial electrograms during cardiac surgery in patients undergoing aneurysmectomy or endocardial resection, or both, for medically intractable ventricular tachycardia. An inflatable balloon covered with 30 terminals at distances of 1.5 to 2 cm was used to record from the entire endocardial surface; a smaller silicone rubber sheet with 30 terminals at distances of 0.7 cm was used to obtain a better spatial resolution. The multielectrodes were inserted into the left ventricular cavity by way of an incision in the aneurysm. A transportable minicomputer was used for the acquisition and analysis of the signals. After initiation of ventricular tachycardia by programmed stimulation, signals of a 1.5 second period were stored and analyzed. The earliest activated terminal could be determined within 2 to 5 minutes. The technique was applied in 32 patients and proved especially useful in those patients in whom sustained tachycardia could not be evoked and in whom conventional mapping with a roving electrode would have been impossible or very time consuming. In all patients, the isochronic maps showed that the ectopic impulses originated from a rather localized area and no evidence was found for large endocardial circus movements, thereby excluding these as a mechanism underlying the tachycardia. Isochronic maps, depicting activation sequences during consecutive ectopic beats with the same QRS morphologic features, showed the same site of origin in all but six patients.(ABSTRACT TRUNCATED AT 250 WORDS)

Cardiac Catheterization↗