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PubMed1993

Early nocturnal blood pressure changes in diabetic autonomic neuropathy assessed by Fourier series.

The 24 h periodic pattern of blood pressure was studied in 44 patients with diabetes mellitus (14 type 1, 30 type 2; mean duration of disease 6.5 +/- 1.8 years) in good metabolic control but with abnormal cardiovascular reflex responses; of these 21 were normotensive and 23 hypertensive. All had abnormal responses to at least two out of four tests: deep breathing, lying to standing, Valsalva manoeuvre and postural hypotension. Two sex- and age-matched groups, consisting of 20 normotensive and 20 hypertensive diabetic patients without dysautonomia, were studied as controls. Each patient underwent ambulatory blood pressure monitoring for at least 24 h, using an auscultatory automatic device. Data were analysed using the sum of three periodic functions (Fourier partial sum). In the diabetic normotensive groups, the absolute blood pressure fell to its night-time minimum more rapidly, and increased to its morning maximum more slowly, in those with abnormal cardiovascular reflexes than in the controls (nightly blood pressure decrease -5.8/-4.7 vs. -3.8/-4.0 mmHg/h; increase 4.7/3.6 vs. 5.9/6.1 mmHg/h). The same behaviour was found in both hypertensive groups but the amplitude of the differences was more marked (blood pressure nocturnal decrease -7.7/-7.1 vs. -4.3/-3.9 mmHg/h; increase 3.2/2.1 vs. 5.8/4.3 mmHg/h). This analysis of 24 h ambulatory blood pressure data may be of value in diagnosis and evaluation of autonomic deficits.

Adult↗
PubMed1975

The clinical significance of systolic murmurs in the elderly.

A group of 278 patients, over the age of 60 years, and representative of geriatric and general medical admissions to the District General Hospital in Banbury, Oxforshire, was studied to correlate the prevalence of systolic murmurs to age, sex, cardiac failure, ischaemic heart disease, dysrrhythmias, hypertension, peripherial vascular disease and anaemia. The object was to establish the clinical significance of these murmurs and test a postulate that they could not be dismissed as benign. Seventy-five per cent of the murmurs were judged to be aortic and 12 per cent mitral in origin. The prevalence of systolic murmurs increased with age from 32 per cent at 60-64 years to 57 per cent over 85 years, and was greater in females (44 per cent) than in males (34 per cent). The presence of systolic murmurs was related to the presence of cardiac failure, ischaemic heart disease, dysrrhythmias, hypertension, peripheral vascular disease and anemia. Only 8 per cent of patients with systolic murmurs had none of the above-mentioned six cardiovascular abnormalities compared with 36 per cent of patients without such a murmur, while multiple cardiovascular abnormalities were also commoner in the former group. The mortality rate in hospital was similar for patients with or without a systolic murmur.

Age Factors↗
PubMedDate not supplied

Cardiovascular effects of type 1 diabetes mellitus in children.

Previous studies have shown that type 1 diabetes mellitus (DM) is associated with cardiovascular abnormalities. Early detection and treatment of these abnormalities may help to prevent the natural progression of the disease. The present study was undertaken to define early cardiovascular abnormalities in children with type 1 DM. Simultaneous evaluation of multiple cardiovascular parameters was performed in 14 children with type 1 DM and 14 age-and gender-matched normal subjects. Measurements of carotid artery intima-media thickness (cIMT, echocardiography), carotid and aortic (ascending and abdominal) distensibility (echocardiography, brachial artery blood pressure), aortic pulse wave velocity (carotid to femoral artery, Doppler), and left ventricular dimensions, mass, and function (echocardiography) were performed. Diabetic children demonstrated a greater cIMT (0.36 +/- 0.04 mm vs 0.31 +/- 0.03 mm, p = 0.002) and decreased carotid artery distensibility (4.4 +/- 1.6 cm(2) . dynes(-1) . 10(-6) vs 6.0 +/- 1.9 cm(2) . dynes(-1) .10(-6), p < 0.01) compared to control. Aortic pulse wave velocity was increased in DM (6.70 +/- 0.39 vs 6.30 +/- 0.31, p = 0.02) compared to control. Left ventricular diameters, mass, and systolic and diastolic function did not differ between the 2 groups. Simultaneous assessment of multiple cardiovascular parameters in children with type 1 DM revealed impaired carotid artery structure and function, and decreased elastic properties of the aorta, before demonstrable changes in left ventricular structure and function could be detected.

Adolescent↗
PubMed1978

Cardiovascular status and blood pressure in a population sample in Ghana--the Mamprobi survey.

In a medical survey of an urban population in Ghana, abnormal cardiovascular findings were present in 25% of the population aged from 15 to 64 years. This was largely due to hypertension and to cardiomegaly of obscure origin. The prevalence of valvular heart disease was comparatively low. Abnormal cardiovascular findings were commonest in the lowest third of the socio-economic stratum and next most frequent in the highest third. Abnormal findings were not related to smoking or drinking habits; these seem to be only marginally important in the population at present.

Adolescent↗
PubMed1995

[Cardiovascular evaluation in athletic children].

Although rare, sports related sudden cardiac deaths in children and adolescents justify the search for risk factors in any child or adolescent who wishes to practice sports. Each time that history and careful clinical cardiovascular examination point to a possible cardiovascular abnormality, an electrocardiogram and an echocardiography must be performed. Exercise testing is useful to appreciate the cardiovascular tolerance, either in normal subjects or in subjects with a cardiovascular abnormality; its interpretation requires good knowledge and understanding of hemodynamic responses to exercise. Indications, risks and procedures of exercise testing are discussed with reference to exercise physiology.

Cardiovascular Diseases↗
PubMed1989

Are lipid abnormalities reliable cardiovascular risk factors in dialysis patients?

Patients on chronic hemodialysis often present both hyperlipidemia and a high incidence of cardiovascular disease (CVD). Uremic hyperlipidemia has usually been regarded as one of the most important cardiovascular risk factors (CVRF) in these patients. In order to study whether the "uremia-induced" lipid abnormalities are actually associated with evidence of uremic CVD, and consequently may be considered reliable CVRF, 123 patients on chronic dialysis were reviewed for the presence of CVD and, at the same time, examined for their lipoprotein pattern and other clinical and biochemical variables. Lipids and lipoproteins did not prove helpful in our study in identifying patients with CVD. Despite the fact that they had been on dialysis for a shorter time, CVD patients were significantly older and had higher blood pressure than patients without CVD. Our data suggest that the uremia-induced lipid abnormalities are not reliable markers of CVD in dialysis patients, and support the hypothesis that dialysis per se does not accelerate the atherosclerotic process in uremic patients.

Aged↗
PubMed2002

Effect of coexisting cardiovascular disease on the long-term efficacy and safety of the implantable atrial defibrillator.

The long-term efficacy and safety of implantable atrial defibrillator (IAD) therapy in patients with AF and cardiovascular disease is unclear. The aim of this study was to evaluate the efficacy and safety of IAD therapy in patients with and without coexisting cardiovascular disease. In 115 patients implanted with an IAD, 85 patients had cardiovascular disease: 41 (48%) patients had 1 cardiovascular abnormality, 29 (35%) patients had 2, 13 (15%) patients had 3, and 2 (2%) patients had 4 different cardiovascular abnormalities. The device was programmed into a rhythm monitoring mode for the first 3-month postimplant period. All defibrillation therapy was performed under physician supervision to monitor safety and efficacy. After this initial monitoring period, patients were allowed to activate their device away from the hospital or clinic. A total of 357 spontaneous AF episodes occurred in 83 (72%) patients during observed operation and the mean shock efficacy was 93.5+/-20.3% (lower 95% confidence interval [CI] 89.8%). As of the lastfollow-up, 58 (55%) patients had transition to receive nonphysician observed therapy. Forty-two (72%) patients had experienced 332 episodes of AF for which theyhad received device therapy away from the hospital/clinic (mean shock efficacy 90.5+/-39.7%). The presence of hypertension, valvular heart disease, and ischemic heart disease did not affect the shock efficacy of the IAD during physician observed and nonobserved therapy (P > 0.05). However, the presence of congestive heart failure was associated with a lower clinical efficacy during observed and nonobserved therapy (P < 0.05). Overall, 5,262 shocks have been delivered with the IAD without any episode of proarrhythmia. The observed proarrhythmic risk was 0%, with an estimated maximum proarrhythmic risk of 0.06% per shock (95% upper CI). A stand-alone IAD appears to be safe in the presence of cardiovascular disease. The lower clinical efficacy for AF associated with congestive heart failure might be related to a higher rate of early reinitiation of AF after defibrillation.

Adult↗
PubMed2003

Cardiovascular reactivity score for the assessment of dysautonomia in familial Mediterranean fever.

OBJECTIVE: The aim of this study was to assess the presence of dysautonomia, as manifested in abnormal cardiovascular reactivity, in patients with familial Mediterranean fever (FMF). METHODS: Fifty-five consecutive patients with FMF and 23 age- and sex-matched healthy controls were evaluated. Cardiovascular reactivity was studied: (1) using recordings of blood pressure (BP) and heart rate (HR) during 10 min of recumbence and 30 min of head-up tilt test to identify clinical endpoints and (2) during tilt-test, identifying parameters acting as independent predictors of FMF reactivity and enabling computation of a cardiovascular reactivity score (CVRS). RESULTS: Clinically, vasovagal reaction, postural tachycardia syndrome, and/or orthostatic hypotension were observed in ten patients (18.1%). Utilizing a derived equation, the group average CVRS in FMF was 5.83+/-1.78 (healthy group -7.60+/-5.41) ( P=<0.0001). A CVRS of >3.25 was associated with FMF, with 98% sensitivity and 100% specificity. CONCLUSION: A very high percentage of FMF patients exhibit abnormal cardiovascular reactivity which is clinically occult but can be detected on autonomic challenge and application of the CVRS.

Adult↗
PubMed1988

Hemodynamic characteristics in neural crest cell-excised chick embryo.

Damage to premigratory cranial neural crest cells results in cardiovascular anomalies of so-called conotruncal anomaly. In one report, it was suggested that hemodynamic alteration would precede abnormal cardiovascular morphogenesis. We repeated this hemodynamic study in neural crest cell-excised chick embryos and found that there was no difference in heart rate and blood pressure between the treated embryos (n = 11; 164 +/- 3 beats per min (BPM) and 0.75 +/- 0.03 mmHg, respectively) and control embryos (n = 7; 160 +/- 6 BPM and 0.72 +/- 0.07 mmHg, respectively). The response of heart rate to acetylcholine was less (P less than 0.05) in the treated embryos (-13% +/- 2%) than in the control (-20% +/- 2%). Thus, the present data do not support the hypothesis that alterations in blood pressure and heart rate are causally related to abnormal cardiovascular morphogenesis. The developmental significance of subtle functional changes in neural crest-extirpated embryos in response to cholinergic challenge is unclear.

Animals↗
PubMed1986

[Use of functional electrocardiographic tests for detecting and evaluating disorders of cardiac rhythm in young people].

Ten-minute-long resting electrocardiograms and functional tests (respiratory arrest, hyperventilation, orthostatic and exercise tests) under continuous cardiac rhythm monitoring were conducted in 239 young subjects between 10 and 35 years of age (153 skilled athletes, 62 apparently normal individuals and 24 young unskilled athletes). Arrthythmias were detected in 124 (51.9%) of those. Complex arrthythmias were particularly common in skilled athletes, as compared to normal subjects and young unskilled athletes (58.2, 45.2 and 29.2%, respectively). Cardiovascular abnormalities were found in 30.7% of skilled athletes and 9.7% of normal subjects. Electrocardiographic functional tests allow timely identification of athletes with cardiovascular abnormalities and the choice of correct therapeutic strategy in terms of stress exposure.

Adolescent↗
PubMed2004

Prenatal and postnatal imaging of thoracopagus conjoined twins with a shared six-chamber heart.

Management of thoracopagus conjoined twins is predominantly determined by the associated complex cardiovascular abnormalities seen in the majority of these cases. Magnetic resonance imaging (MRI), including three-dimensional contrast-enhanced magnetic resonance angiography (MRA) provides a useful complement to conventional cardiac echocardiography or catheterization for detailed evaluation of the extra-cardiac anatomy. We report a pair of female thoracopagus conjoined twins with a shared six-chambered heart. The MRA findings are highlighted.

Abnormalities, Multiple↗
PubMed1999

Relationship between insulin resistance and nonmodulating hypertension: linkage of metabolic abnormalities and cardiovascular risk.

Insulin resistance is a feature common to patients with diabetes and to some with hypertension. It is assumed that this feature confers the increased metabolic risk in hypertension. However, the state of the renin-angiotensin system might contribute to cardiovascular risk, although there is no clear mechanistic explanation. Our recent observation that insulin levels are increased in a specific subset of patients with normal/high-renin hypertension, the nonmodulators, provided the background for the current hypothesis: to ascertain whether abnormalities in lipid and carbohydrate metabolism are observed in the same patients in whom alterations in sodium transport, sodium homeostasis, and the renin-aniotensin system response have been identified. Exploration of a family history of cardiovascular risk was a secondary goal. Insulin sensitivity (assessed by a 75-g oral glucose load), lipid levels, and two defects in the renin-angiotensin system were assessed in 62 hypertensive and 14 normotensive subjects placed on a high (210 mmol/l) and a low (10 mmol/l) sodium intake for 2 weeks, to classify them as low-renin, nonmodulator, or modulating hypertensive subjects. Only in nonmodulators were the following cardiovascular risk factors significantly increased: fasting insulin (P < 0.01); increment in post-glucose load insulin (P < 0.01); total, LDL, and VLDL cholesterol and triglyceride levels (P < 0.05); and erythrocyte Na+/Li+ countertransport activity (P < 0.001). Both nonmodulators and low-renin hypertensive subjects had a significantly (P < 0.01) increased frequency of a family history of hypertension by questionnaire compared with subjects with intact modulation. However, only nonmodulators had a significantly (P < 0.02) higher frequency of a family history of myocardial infarction. Thus, there is a clustering of metabolic abnormalities in a discrete subset of the essential hypertensive population with a specific dysregulation of the renin-angiotensin system--nonmodulation. The absence of this cluster in low-renin hypertensive subjects may explain their relatively diminished cardiovascular risk. Its presence in nonmodulators likely contributes to the increased cardiovascular risk observed in normal/high-renin hypertension.

Adult↗
PubMed1988

[Limitations of two-dimensional echocardiography in infants under one month of age].

One hundred and thirty-three children less than one month of age and presenting with congenital heart disease were investigated using two-dimensional echocardiography (TD echo). In these children, 234 cardiovascular abnormalities had been proven by hemodynamic and angiographic investigations (n = 103), post-mortem examinations (n = 15) or operative findings (n = 12). TD echo identified 201 cardiovascular abnormalities with 33 false negatives (sensitivity 86%) and 12 false positives (specificity 94%). Diagnosis after TD echo was correct in 100 children (75%), incomplete in 18 (13.5%), imprecise in 11 (8.3%) and false in 4 (3%). The most frequently unrecognized lesions were: anomalous systemic venous drainage (5/8), persistent ductus arteriosus (5/12), pulmonary stenosis (3/8), ventricular septal defect (5/27), coarctation (2/18). The lesions difficult to characterize concerned mostly the pulmonary valve and the aspect of the aortic arch. On the other hand, TD echo allowed to correctly identify major intracardiac abnormalities, malpositions of the great vessels and to well appreciate the dimensions of the trunk and branches of the pulmonary artery. These results allow to refrain from diagnostic endocavitary investigations in most of the heart defects revealed in the neonatal period and to perform curative or palliative closed heart surgery without preoperative catheterization. However, clinical, angiographic and hemodynamic investigations keep an important place in the preoperative evaluation of defects that may benefit from open heart surgery.

Cardiac Catheterization↗
PubMedDate not supplied

[Electrocardiographic abnormalities and cardiovascular risk factors for ischemic heart disease in an adult population from São Paulo, Brazil].

OBJECTIVE: Ischemic heart disease is associated with high rates of mortality and it is the most prevalent among cardiovascular diseases. It is a multifactorial disease, and its prevention depends on control of risk factors. Resting electrocardiogram can be used to detect manifestations of ischemic heart disease, since some electrocardiographic abnormalities are indicative of coronary disease in asymptomatic subjects. The aim of the study was to analyze the relationship between electrocardiographic abnormalities and risk factors for ischemic heart disease in an adult population from the metropolitan area of São Paulo. METHODS: A cross-sectional study was carried out in an adult population (age 20 years and over) from Cotia, near São Paulo, southeastern of Brazil. The study population comprised 1067 subjects. The subjects were interviewed using a questionnaire. The variables studied were: gender, age, smoking behaviour, physical activity, body mass index, waist-to-hip ratio, blood pressure, diabetes mellitus, blood lipids (total cholesterol, LDL-cholesterol, HDL-cholesterol and triglycerides) and electrocardiographic abnormalities. Electrocardiographic abnormalities were grouped according to the classification: ST-T changes, left ventricular hypertrophy and abnormalities non related to ischemic myocardial disease or without abnormalities. RESULTS: The population was relatively -young (79% younger than 50 years, mean age 39.8 +/- 13.2 years old), and 59.3% were female. The resting electrocardiogram showed ST-T changes in 9.5% of the subjects and left ventricular hypertrophy in 3.3%. Female gender, age over 65 years for women and 55 years for men, diabetes, hypertension, total cholesterol >/= 200 mg/dl, LDL-cholesterol >/=130 mg/dl, Triglycerides >/=200 mg/dl, body mass index >/= 25 Kg/m2 and abnormal waist-to-hip ratio, were positively related to ST-T changes. Male gender, diabetes, hypertension and smoking behaviour were positively related to left ventricular hypertrophy. In the presence of ST-T changes on the ECG, we observed an odds ratio of 3.54 for the diagnosis of systolic hypertension an of 1.83 for total cholesterol >/= 200 mg/dl. In the presence of left ventricular hypertrophy on the ECG, we found an odds ratio of 5.92 for systolic hypertension diagnosis. Among the three most important risk factors correlated to electrocardiographic abnormalities indicative of myocardial ischemia, two can be controlled by nutritional intervention (hypertension and total cholesterol >/= 200 mg/dl). This findings suggest the importance of its early detection. Future studies should determine the predictive value of the electrocardiogram, a simple and inexpensive method, suggesting the presence of cardiovascular risk factors in epidemiological and nutritional studies.

Adult↗
PubMed2001

Relation of various degrees of body mass index in patients with systemic hypertension to left ventricular mass, cardiac output, and peripheral resistance (The Hypertension Genetic Epidemiology Network Study).

The impact of different methods of indexation of left ventricular (LV) mass and systemic hemodynamic variables on prevalences and correlates of cardiovascular abnormalities in relation to level of obesity in populations remains unclear. We evaluated 1,672 participants in the Hypertension Genetic Epidemiology Network Study to investigate the relations of overweight and level of obesity to LV mass and prevalences of LV hypertrophy, abnormal cardiac output, and peripheral resistance detected using different indexations for body size. In our study population, 1,577 subjects were clinically healthy nondiabetic hypertensive and 95 were normotensive normal-weight nondiabetic reference subjects. Fat-free mass (FFM) did not differ between the reference group and the normal-weight hypertensive subjects, and increased with overweight. In hypertensive subjects, LV mass and cardiac output increased and total peripheral resistance decreased with overweight. Indexation of LV mass for FFM or body surface area (BSA) resulted in no difference or even lower prevalence of LV hypertrophy in severely obese compared with normal-weight hypertensive subjects. In contrast, indexation of LV mass for height(2.7) identified an increased prevalence of LV hypertrophy with overweight and obesity. Absolute cardiac output increased and total peripheral resistance decreased with overweight. Prevalence of elevated cardiac output indexed for height(1.83) increased and for elevated total peripheral resistance-height(1.83) index decreased with greater overweight, whereas opposite trends were seen when cardiac output and total peripheral resistance were indexed for BSA or FFM. Thus, in hypertensive subjects, FFM increases with overweight and is directly related to LV mass, stroke volume, and cardiac output, and inversely related to total peripheral resistance. Indexations of LV mass and systemic hemodynamics for FFM or BSA obscured associations of LV hypertrophy and abnormal cardiac and total peripheral resistance indexes with overweight, whereas LV mass/height(2,7), cardiac output/height(1.83), and total peripheral resistance-height(1.83) detected significant preclinical cardiovascular abnormalities with obesity.

Body Mass Index↗
PubMed1996

Sudden death in young competitive athletes. Clinical, demographic, and pathological profiles.

OBJECTIVE: To develop clinical, demographic, and pathological profiles of young competitive athletes who died suddenly. DESIGN: Systematic evaluation of clinical information and circumstances associated with sudden deaths; interviews with family members, witnesses, and coaches; and analyses of postmortem anatomic, microscopic, and toxicologic data. PARTICIPANTS AND SETTING: A total of 158 sudden deaths that occurred in trained athletes throughout the United States from 1985 through 1995 were analyzed. MAIN OUTCOME MEASURES--Characteristics and probable cause of death. RESULTS: Of 158 sudden deaths among athletes, 24 (15%) were explained by noncardiovascular causes. Among the 134 athletes who had cardiovascular causes of sudden death, the median age was 17 years (range, 12-40 years), 120 (90%) were male, 70 (52%) were white, and 59 (44%) were black. The most common competitive sports involved were basketball (47 cases) and football (45 cases), together accounting for 68% of sudden deaths. A total of 121 athletes (90%) collapsed during or immediately after a training session (78 cases) or a formal athletic contest (43 cases), with 80 deaths (63%) occurring between 3 PM and 9 PM. The most common structural cardiovascular diseases identified at autopsy as the primary cause of death were hypertrophic cardiomyopathy (48 athletes [36%]), which was disproportionately prevalent in black athletes compared with white athletes (48% vs 26% of deaths; P = .01), and malformations involving anomalous coronary artery origin (17 athletes [13%]). Of 115 athletes who had a standard preparticipation medical evaluation, only 4 (3%) were suspected of having cardiovascular disease, and the cardiovascular abnormality responsible for sudden death was correctly identified in only 1 athlete (0.9%). CONCLUSIONS: Sudden death in young competitive athletes usually is precipitated by physical activity and may be due to a heterogeneous spectrum of cardiovascular disease, most commonly hypertrophic cardiomyopathy. Preparticipation screening appeared to be of limited value in identification of underlying cardiovascular abnormalities.

Adolescent↗
PubMed1995

Cardiac abnormalities associated with hydrops fetalis.

Cardiovascular abnormalities are associated with hydrops fetalis in 26% of cases reported in the modern era. These include not only structural abnormalities, but also cardiac arrhythmias, failure, tumors, myopathy, infection, inflammation, infarction, and arterial calcification. Cardiac structural abnormalities may be causative or seen only in association with hydrops fetalis. Structural lesions that result in right atrial pressure or volume overload seem to be most commonly associated with hydrops fetalis. Fetal cardiac tumors, cardiomyopathy, myocarditis, myocardial infarction, and arterial calcification probably result in hydrops fetalis by a similar mechanism. Fetal tachyarrhythmia has been shown to result in elevation of atrial pressure and atrial natriuretic peptide. Fetal tachyarrhythmias are the most treatable of cardiac causes of hydrops fetalis. Fetal bradyarrhythmias are less easily treatable and less certainly a causative mechanism of hydrops fetalis.

Bradycardia↗