László Rudas

Determinants of Spontaneous Baroreflex Sensitivity in a Healthy Working Population

Baroreflex sensitivity (BRS) by the spontaneous sequence technique has been widely used as a cardiac autonomic index for a variety of pathological conditions. However, little information is available on determinants of the variability of spontaneous BRS and on age-related reference values of this measurement in a healthy population. We evaluated BRS as the slope of spontaneous changes in systolic blood pressure (BP) and pulse interval from 10 minutes BP (Finapres) and ECG recordings in 1134 healthy volunteers 18 to 60 years of age. Measurement of BRS could be obtained in 90% of subjects. Those with unmeasurable spontaneous BRS had a slightly lower heart rate but were otherwise not different from the rest of the population. BRS was inversely related to age (lnBRS, 3.24−0.03×age;r2=0.23;P <0.0001) in both genders. In addition, univariate analysis revealed a significant inverse correlation between BRS and heart rate, body mass index, and BP. Sedentary lifestyle and regular alcohol consumption were also associated with lower BRS. However, only age, heart rate, systolic and diastolic BP, body mass index, smoking, and gender were independent predictors of BRS in a multivariate model, accounting for 47% of the variance of BRS. The present study provides reference values for spontaneous BRS in a healthy white population. Only approximately half of the variability of BRS could be explained by anthropometric variables and common risk factors, which suggests that a significant proportion of interindividual differences may reflect genetic heterogeneity.

Epidemiology of congenital coronary artery anomalies: A coronary arteriography study on a Central European population

The anatomical patterns and frequency of occurrence of congenital coronary anomalies (CCA) in a Central European cohort has not yet been studied. The angiographic data of 7,694 consecutive patients undergoing coronary arteriography at the Albert Szent-Györgyi Medical University, Szeged, Hungary, from 1984 to 1994 were analyzed. CCA were found in 103 patients (1.34% incidence). Ninety-eight of them (95.2%) had anomalies of origin and distribution, and five (4.8%) had coronary artery fistulae. The incidence was the highest for the separate origin of left descending artery and left circumflex from the left sinus of Valsalva (52.42%). Anomalous origin of the left circumflex coronary artery from the right coronary was 8.7% while from the right sinus of Valsalva 18.4%. CCA, which may be associated with potentially serious events, such as ectopic coronary origin from the opposite aortic sinus (1.9%) and single coronary arteries (3.88%), were not frequent. The incidence of CCA in the Central European cohort under study was similar to that of the largest North American study. The anatomic classification presented can be useful from both clinical and surgical standpoints.

Depressed baroreflex sensitivity in patients with Alzheimer’s and Parkinson’s disease

Parkinsons disease (PD) and Alzheimers dementia (AD) are often associated with an autonomic neuropathy. The extent of autonomic involvement, however is poorly defined and unpredictable. In order to assess the autonomic cardiovascular regulation baroreflex sensitivity (BRS) was determined non-invasively in 23 patients (age: 65 +/- 9.3 years) with PD and 24 patients with AD (age: 72.3 +/- 7.2 years). The results were compared with those on 22 healthy age- and sex-matched volunteers. Patients with PD and AD exhibited marked abnormalities in cardiovascular autonomic reflex regulation showed by markedly depressed BRS. The possible predictive value of centrally based depression of baroreflex sensitivity necessitates further studies.

Effect of postural changes on arterial baroreflex sensitivity assessed by the spontaneous sequence method and Valsalva manoeuvre in healthy subjects.

The objective of this study was to compare the baroreflex sensitivity (BRS) assessed by the new, non-invasive, spontaneous sequence method (BRS-sequence) with the Valsalva manoeuvrebased BRS. Fourteen healthy volunteers were studied in the supine position, during 60° head-up tilt (HUT) and during −30° head-down tilt (HDT). Blood pressure and R-R intervals were continuously and non-invasively recorded using a Finapres device. The BRS-sequence was assessed by analysing the slopes of spontaneously occurring sequences of three or more consecutive beats in which systolic blood pressure and R-R interval of the following beat increased or decreased in the same direction in a linear fashion; it was compared with data obtained during the Valsalva manoeuvre in each position. The time and frequency domain indices of R-R interval variability were also evaluated. The mean difference of BRS between the two non-invasive methods was 3.86 ms/mmHg with a standard deviation of 9.14 ms/mmHg. BRS was decreased during HUT and increased during HDT as assessed by both techniques. The changes in BRS were associated with vagal withdrawal and sympathetic activation during HUT and enhancement in the cardiac vagal tone and reduction in the sympathetic activity during HDT. We conclude that the BRS-sequence technique provides a reliable method to study the neural control of the circulation, although the body position in consecutive measurements needs to be standardized.

Effect of axillary brachial plexus blockade on baroreflex-induced skin vasomotor responses: assessing the effectiveness of sympathetic blockade

Background: The combination of laser Doppler flowmetry and non‐invasive blood pressure monitoring allows the continuous observation of cutaneous vascular resistance (CVR). Continuous recording of unmodulated skin blood flow (SBF) is very sensitive to artefacts, rendering the method unreliable. In contrast, intermittent short lasting challenges of the CVR by cardiovascular autonomic reflexes may provide information about the responsiveness of the sympathetic nervous system in the skin.

[Coronary artery dissection in the postpartum period--a case study].

Coronary artery dissection in the postpartum period ‐ a case study. Spontaneous coronary dissection is a rare condi tion occuring more often in women, with a higher frequency during the peripartum period. No specific aetiology has been defined to this uncommon, but often fatal disease. We describe the case of a young woman admitted to our intensive care unit with ECG-findings of acute anterior myocardial infarction presented oneweek after delivery. The acute coronary an giography didn’t show significant stenoses or occlusion, therefore angioplasty was not done. Cardiogenic shock developed, which could be reverted by mechanical circulatory support and the condition of our patient stabilized. Later, new-onset cardiac ischemic signs presented warranting a repeated coronary angiography, which detected dissection on the distal part of the left main coronary artery with signs of flow-limiting even in the circumflex artery. Therefore, urgent coronary by pass surgery was performed with good results. Spontaneous coronary dissection must be considered when evaluating a pa tient in the peripartum period with signs of acute coronary syndrome, given its high overall mortality. The treatment holds specific points of consideration.Spontaneous coronary dissection is a rare condition occurring more often in women, with a higher frequency during the peripartum period. No specific aetiology has been defined to this uncommon, but often fatal disease. We describe the case of a young woman admitted to our intensive care unit with ECG-findings of acute anterior myocardial infarction presented one week after delivery. The acute coronary angiography didnt show significant stenoses or occlusion, therefore angioplasty was not done. Cardiogenic shock developed, which could be reverted by mechanical circulatory support and the condition of our patient stabilized. Later, new-onset cardiac ischemic signs presented warranting a repeated coronary angiography, which detected dissection on the distal part of the left main coronary artery with signs of flow-limiting even in the circumflex artery. Therefore, urgent coronary bypass surgery was performed with good results. Spontaneous coronary dissection must be considered when evaluating a patient in the peripartum period with signs of acute coronary syndrome, given its high overall mortality. The treatment holds specific points of consideration.

Orthostaticus tachycardia szokatlan esete@@@Unusual case of orthostatic tachycardia

Orthostatic intolerance and postural tachycardia are common complaints, often caused by hypovolemia, antihypertensive medications, diuretics or alcohol. These symptoms could also be related to autonomic failure. Although upright posture renders patients more susceptible to provocation of supraventricular tachyarrhythmias in the electrophysiologic laboratory, orthostasis by itself seldom enough for the induction of such arrhythmias. The authors hereby present a patient, whose AV nodal reentry tachycardia could be provoked by head-upright tilting. Vagal maneuvers could terminate the tachycardia by decreasing the conduction in the slow anterograde pathway, however these maneuvers were successful only after assuming supine posture. The authors report illustrates the role of autonomic influences, and the mechanism of vagal maneuvers in terminating this common arrhythmia.

Extrasystolic stimulation with bi-ventricular pacing: an acute haemodynamic evaluation.

AIMSnCardiac resynchronization therapy (CRT) by means of biventricular pacing (BiVP) is well established as a treatment for patients with heart failure (HF). Post-extrasystolic potentiation, (PESP) which involves a transient increase in myocardial contractility following a ventricular extrasystole, can be achieved using extrasystolic stimulation (ESS). On this basis, ESS has been proposed as a therapeutic. We assessed acute haemodynamic effects of ESS in the context of BiVP.nnnMETHODS AND RESULTSnPatients (n = 15, left ventricular ejection fraction < 40%, QRS ≥ 125 ms) with HF, received BiVP in combination with right ventricular (RV) ESS (single stimulus or pulse train). Left ventricular (LV) and peripheral arterial pressures were recorded and dP/dt was monitored. Addition of RV ESS to BiVP pacing led to a 21% increase in maximum (max) dP/dt (P < 0.001) and an 8.5 mm Hg increase in a systolic arterial pressure (P < 0.001). The modest fall in end-diastolic pressure (3.3 mmHg, P < 0.001) observed during ESS and BiVP was prevented by maintaining baseline sinus rate. Varying ESS modes or pacing outputs was not associated with differences in haemodynamic parameters.nnnCONCLUSIONSnBiventricular pacing in combination with ESS, with maintenance of sinus rate, improves myocardial contractility in patients undergoing CRT.

Postpartum coronaria dissectio esete@@@Coronary artery dissection in the postpartum period – a case study

Coronary artery dissection in the postpartum period ‐ a case study. Spontaneous coronary dissection is a rare condi tion occuring more often in women, with a higher frequency during the peripartum period. No specific aetiology has been defined to this uncommon, but often fatal disease. We describe the case of a young woman admitted to our intensive care unit with ECG-findings of acute anterior myocardial infarction presented oneweek after delivery. The acute coronary an giography didn’t show significant stenoses or occlusion, therefore angioplasty was not done. Cardiogenic shock developed, which could be reverted by mechanical circulatory support and the condition of our patient stabilized. Later, new-onset cardiac ischemic signs presented warranting a repeated coronary angiography, which detected dissection on the distal part of the left main coronary artery with signs of flow-limiting even in the circumflex artery. Therefore, urgent coronary by pass surgery was performed with good results. Spontaneous coronary dissection must be considered when evaluating a pa tient in the peripartum period with signs of acute coronary syndrome, given its high overall mortality. The treatment holds specific points of consideration.Spontaneous coronary dissection is a rare condition occurring more often in women, with a higher frequency during the peripartum period. No specific aetiology has been defined to this uncommon, but often fatal disease. We describe the case of a young woman admitted to our intensive care unit with ECG-findings of acute anterior myocardial infarction presented one week after delivery. The acute coronary angiography didnt show significant stenoses or occlusion, therefore angioplasty was not done. Cardiogenic shock developed, which could be reverted by mechanical circulatory support and the condition of our patient stabilized. Later, new-onset cardiac ischemic signs presented warranting a repeated coronary angiography, which detected dissection on the distal part of the left main coronary artery with signs of flow-limiting even in the circumflex artery. Therefore, urgent coronary bypass surgery was performed with good results. Spontaneous coronary dissection must be considered when evaluating a patient in the peripartum period with signs of acute coronary syndrome, given its high overall mortality. The treatment holds specific points of consideration.

Álsyncope és álgörcsroham@@@Pseudosyncope and pseudoseizure

Syncope is a frequent complaint which imposes a considerable burden on the health care systems. Although our diagnostic tools have improved during the last decades, the exact cause of syncope still remains unknown in a small fraction of cases. In the heterogenous group of syncope with unknown origin there are a few cases of pseudosyncope. Unlike the true episodes of syncope, the episodes of pseudosyncope are not associated with compromised cerebral circulation. The pseudosyncope in reality is a manifestation of conversion disorder, and as such shares many features with pseudoseizure. The latter is also characterized by the lack of typical neurological and EEG manifestations at the time of attacks. We present a case of a 57-year-old female with a 30 year history of attacks corresponding either to pseudosyncope or pseudoseizure. A brief overview of literature of pseudosyncope is also given, and the importance of an interdisciplinary diagnostic approach is emphasized.