PubMed Health⌕ Search

Biomedical subjects

A Naszlady

Publications and source records attributed to A Naszlady.

16 recordsLinked to original sources
PubMed1997

[The use of adenosine in the diagnosis and treatment of cardiac arrhythmias].

The authors investigated the effect of adenosine or ATP on narrow QRS tachycardia in 56 pts, 3 pts with wide QRS tachycardia 9 pts with suspected latent preexcitation and 10 pts with PVC suspected to be ventricular parasystole. After the bolus iv. administration of adenosine or ATP every SVT was stopped related to AV node (44 pts), but in the rest twelve related to atrial origin of SVT only one automatic atrial tachycardia could be stopped. From the 9 patient suspected to have concealed WPW 2 pts had delta wave during the effect of adenosine, and in four pts parasystole was demonstrated among the pts had varying coupling interval PVC. None of the pts who had wide QRS tachycardia was the tachycardia stopped, but in two cases the supraventricular origin--atrial flutter and tachycardia--was discovered. The authors emphasize the favourable effect of adenosine in narrow complex tachycardia and suggest that it can given safely in wide QRS tachycardia of unknown origin either. The diagnostic effect of adenosine can be used in sinus rhythm too if latent preexcitation or ventricular parasystole is suspected.

Adenosine Triphosphate↗
PubMed1995

Computer-models for management of a cardiopulmonary clinic.

To optimize the transition of a cardiopulmonary ward management from a centrally directed (so called "socialist") healthcare system to a free market oriented one, the authors constructed two computer-models: one for the simulation of distribution of the financing and another for the simulation of interventional pathways in an operational flow chart. For parameter estimation specificity, sensitivity, and diagnosis probability, function curves have been defined. After using these models, the effectiveness of ward performance and the quality of care have improved.

Computer Simulation↗
PubMed1994

Relation between tonic sympathetic and vagal control of human sinus node function.

BACKGROUND: Clinical conditions, such as heart failure or myocardial infarction are associated with enhanced sympathetic and reduced parasympathetic activity as compared to normal controls. The reciprocal alteration in cardiac autonomic tone likely contributes to the electrical instability of the myocardium. Little information is available on the relation between sympathetic and vagal cardiac control in healthy human subjects. METHODS AND RESULTS: Heart period changes in response to autonomic blockades were measured in 16 young, healthy human subjects. Adrenergic and cholinergic blockades were induced by i.v. propranolol (0.2 mg/kg) and atropine (0.04 mg/kg) in two opposite orders on two occasions; interindividual correlations were performed between the R-R interval responses to propranolol and to atropine obtained under the various blockade conditions, and the magnitude of the responses were compared by a drug x order two factorial ANOVA design. It was found, that previous adrenergic blockade did not reduce the extent of cardioacceleration produced by subsequent cholinergic blockade and that the R-R interval responses to atropine and to subsequently given propranolol did not share significant variance across subjects (r = 0.22, P = 0.234). Also, no interindividual correlation was found between the R-R interval responses to propranolol and to atropine, with the influence of the other, respective, autonomic division already blocked (r = 0.42, P = 0.114). CONCLUSIONS: Under resting conditions, activity levels of cardiac vagal and sympathetic outflows are not related across young, healthy human subjects and peripheral interaction is not manifest between the autonomic divisions.

Adrenergic Fibers↗
PubMed1994

Relation between baroreflex sensitivity and cardiac vagal tone in humans.

The extent of dependence of cardiac vagal tone on arterial baroreceptor input has been studied in 12 healthy, young adult subjects. Cardiac vagal tone was defined as the chang in R-R interval after complete cholinergic blockade by atropine. Baroreflex sensitivity was determined with the "Oxford-method": R-R interval was regressed against systolic pressure. The interindividual correlation between cardiac vagal tone and baroreflex sensitivity for falling pressures was found to be significant, but not close (R = 0.81, P = 0.002). In each subject, the baroreflex regression line for falling pressures was extrapolated to the post-atropine R-R interval level; 50 mmHg was considered as minimum and 80 mmHg as maximum threshold level for the integrated baroreflex. From the relation between the individual regression lines and the minimum and maximum threshold levels, it was concluded that cardiac vagal tone could be generated by both baroreflex-dependent and -independent mechanisms, the ratio of which varies in different individuals, with the baroreflex-dependent mechanism being the dominant factor.

Adult↗
PubMed1993

[Pathogenic role of a pacemaker in occult infection].

A case of seronegative pacemaker lead infection is presented. The diagnosis based on patient history and echocardiography was proved by removing the infected leads from the beating heart through surgery.

Echocardiography↗
PubMed1992

[Rhabdomyoma of unusual manifestation].

According to our knowledge in adult pericardial effusion has never been reported to be present in cases of cardiac rhabdomyoma. We present the history of an adult patient with pericardial effusion due to cardiac rhabdomyoma.

Adult↗
PubMed1991

[Prinzmetal angina and syncope].

Authors report an unusual case of variant angina associated with unconsciousness. They were able to prove by coronary angiography the vasospasm of the circumflexus artery which was responsible for the morning attacks of the 35 year old patient with unconsciousness, ST segment elevation and high degree AV block. Unconsciousness was the first and earliest sign of the coronary vasospasm.

Adult↗
PubMed1984

Evaluation problems of a long-term study on evolving pulmonary arterial hypertension in chronic non specific lung disease.

After having collected a sufficient number of standardized data checked for reliability from patients with chronic non specific lung disease, the following subgroups of pulmonary arterial mean pressure were defined: A = PAP less than 2.7 kPa [= 20 mmHg]; B = 2.7 less than PAP less than 4 kPa; C = PAP greater than 4 kPa [= 30 mmHg]. Within these subgroups a diagnostic classification was also carried out: chronic obstructive lung disease, thrombo-embolic lung disease, diffuse interstitial lung disease. The aims of data processing were: clustering correctly individual cases in one of the I-II-III subgroups based on non-invasive variables only; To define equations predictive of quantitative values of pulmonary arterial mean pressure from non-invasive data; To find regularity of evolution of elevated pulmonary arterial mean pressure in chronic non specific lung disease and detect risk factors and/or beneficial interventions if such exist at all. Two different statistical methods were applied: conditional probability (Bayes theorem) and discriminant analysis. The predictive power of each depends mainly on the seriousness of signs and symptoms denoted by the medical user. Three probability-functions have been defined between severity of single variables and their specificity, sensitivity and probability of pulmonary hypertension. By application of these functions the user can select different quantitative values of variables which determine the proportion of false/true, positive/negative cases. After having chosen the desired values of these proportions, multivariate equations are defined by stepwise regression analysis optimized for predictive power.(ABSTRACT TRUNCATED AT 250 WORDS)

Bayes Theorem↗