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Biomedical subjects

F Magrini

Publications and source records attributed to F Magrini.

At least 37 records · Page 2Linked to original sources
PubMed2001

Effects of thyroid hormones on cardiac structure: a tissue characterization study in patients with thyroid disorders before and after treatment.

Experimental evidence suggests an involvement of thyroid hormones in myocardial nonmyocyte component growth. We evaluated the possible role of thyroid hormones in myocardial remodeling by ultrasonic tissue characterization (videodensitometry) in 8 hyperthyroid patients, in 10 hypothyroid patients, and in 2 patients with thyroid hormone resistance syndrome (RTH), before, 60, and 120 days after treatment (T0, T60, T120), and in 10 age-matched euthyroids. According to a previously described procedure, the derived collagen volume fraction (dCVF%, an echocardiographic index estimating the collagen content) was predicted from the pixel-level frequency distribution width (broadband, Bb) of the selected echocardiographic images. Thyrotropin (TSH), free thyroxine (FT4), and free triiodothyronine (FT3) were assessed by immunometric method. QT interval dispersion (QTd) on basal electrocardiogram was measured as a marker of dyshomogeneous ventricular repolarization. At T0, Bb and dCVF% were normal in hyperthyroid and euthyroid patients, and slightly increased in RTH patients, whereas significantly higher values were found in hypothyroids. At T60, a significant reduction in Bb was observed in hypothyroids, with nearly normal dCVF% values. This trend was confirmed at T120 with complete normalization of echoreflectivity. No echoreflectivity changes were observed in hyperthyroid and RTH patients during treatment. QTd was significantly increased in hypothyroids at T0, while no significant differences were found among groups at T60 and T120. Because the different videodeonsitometric myocardial properties observed in hypothyroid versus hyperthyroid patients correspond to an increase of dCVF%, this study suggests that thyroid hormones exert an inhibitory effect on myocardial collagen synthesis in humans.

Adult↗
PubMed2001

Target organ damage and non-dipping pattern defined by two sessions of ambulatory blood pressure monitoring in recently diagnosed essential hypertensive patients.

OBJECTIVE: To evaluate in a selected population of patients with a recent diagnosis of hypertension whether a reduced nocturnal fall in blood pressure, confirmed by two 24 h ambulatory blood pressure monitoring (ABPM) sessions is associated with more prominent target organ damage (TOD). METHODS: The study was structured in two phases: in the first, 141 consecutive, recently diagnosed, never-treated essential hypertensives underwent 24 h ABPM twice within 3 weeks; in the second phase, 118 of these patients showing reproducible dipping or non-dipping patterns underwent the following procedures: (1) routine blood chemistry, (2) 24 h urinary collection for microalbuminuria, (3) amydriatic photography of ocular fundi, (4) echocardiography and (5) carotid ultrasonography. RESULTS: The 92 patients with (>10%) night-time fall in systolic blood pressure (SBP) and diastolic blood pressure (DBP) (dippers) in both monitoring sessions were similar for age, gender, body surface area, smoking habit, clinic BP, 24 h and 48 h BP to the 26 patients with a < or = 10% nocturnal fall (non-dippers) in both sessions. The prevalence of left ventricular hypertrophy (LVH) (defined by two criteria: (1) LV mass index > or = 125 g/m2 in both genders; (2) LV mass index > or = 120 and 100 g/m2 in men and women, respectively) and that of carotid intima-media (IM) thickening (IM thickness > or = 0.8 mm) were significantly higher in non-dippers than in dippers (23 versus 5%, P < 0.01; 50 versus 22%, P < 0.05; and 38 versus 18%, P < 0.05, respectively). There were no differences among the two groups in the prevalence of retinal changes and microalbuminuria. The strength of the association of LV mass index with night-time BP was slightly but significantly greater than that with daytime BP. CONCLUSIONS: This study suggests that a blunted reduction in nocturnal BP, persisting over time, may play a pivotal role in the development of some expressions of TOD, such as LVH and IM thickening, during the early phase of essential hypertension, despite similar clinic BP, 24 h and 48 h BP levels observed in non-dippers and dippers.

Adult↗
PubMed2001

High prevalence of cardiac and extracardiac target organ damage in refractory hypertension.

OBJECTIVE: Target organ damage (TOD) in chronically treated hypertensives is related to effective blood pressure (BP) control. The aim of this study was to evaluate the prevalence of cardiac and extracardiac TOD in patients with refractory hypertension (RH) compared with well-controlled treated hypertensives (C). METHODS: Fifty-four consecutive patients with RH (57 +/- 10 years), selected according to WHO/ISH guidelines definition, and 51 essential hypertensives (55 +/- 10 years) with satisfactory BP control obtained by association therapy, underwent the following procedures: (1) clinic BP measurement; (2) blood sampling for routine chemistry examinations; (3) 24 h urine collection for microalbuminuria; (4) non-mydriatic retinography; (5) echocardiogram; (6) carotid ultrasonogram. In order to exclude 'office resistance' (defined as clinic BP > 140/90 mmHg and average 24 h BP </= 125/79 mmHg), all patients with RH were subjected to 24-hour ambulatory BP monitoring. RESULTS: Both groups were similar for age, gender, body surface area, smoking habit and duration of hypertension, glucose, creatinine and lipid levels. By definition, clinic BP was significantly higher in RH than C (161 +/- 19/96 +/- 9 versus 127 +/- 6/80 +/- 5 mmHg, respectively, P < 0.01). The increased prevalence of left ventricular hypertrophy (LVH) and carotid intima-media (IM) thickening (40 versus 12%, P < 0.01, according to a non-gender-specific partition value of 125 g/m2; and 36 versus 14%, P < 0.01, according to IM thickness > or =1.0 mm, respectively); a higher prevalence of carotid plaques (65 versus 32%, P < 0.05), a more advanced retinal involvement (grade II and III, 73 and 5% versus 38 and 0%, P < 0.01) and a greater albumin urinary excretion (22 +/- 32 mg/24 h versus 11 +/- 13 mg/24 h, P < 0.01) were found in RH compared to C. CONCLUSIONS: Our study suggests that RH is a clinical condition associated with a high prevalence of TOD at cardiac, macro- and microvascular level and consequently with high absolute cardiovascular risk, which needs a particularly intensive therapeutic approach aimed to normalize BP levels and to induce TOD regression.

Albuminuria↗
PubMed2001

Evaluation of target organ damage in arterial hypertension: which role for qualitative funduscopic examination?

BACKGROUND: The objective of this study was to compare the prevalence of quantitative markers of target organ damage, such as echocardiographically documented left ventricular hypertrophy (LVH), carotid structural changes and microalbuminuria with that of retinal abnormalities detected by qualitative funduscopic examination in a large selected population of patients with essential hypertension. METHODS: Eight hundred consecutive untreated (n = 232) and treated (n = 568) hypertensive patients (386 men, 414 women, mean age 52.7 +/- 11.8 years) referred for the first time to our out-patient clinic were included in the study. In order to search for target organ damage, they were submitted to the following procedures: 1) amydriatic retinography, 2) 24-hour urine collection for microalbuminuria, 3) echocardiography, and 4) carotid ultrasonography. Retinal changes were evaluated according to the Keith, Wagener and Barker (KWB) classification by two physicians, who had no knowledge of the patients' characteristics. Microalbuminuria was defined as a urinary albumin excretion > 30 and < 300 mg/24 hours, LVH as a left ventricular mass index > or = 134 g/m2 in men and > or = 110 g/m2 in women; finally carotid plaque was defined as a focal thickening > 1.3 mm. RESULTS: Hypertensive retinopathy was the most frequent (KWB grade I 46%, II 32%, III-IV < 2%) marker of target organ damage, followed by carotid plaques (43%), LVH (22 %, eccentric LVH was the prevalent type and was 1.8 times as frequent as the concentric one) and microalbuminuria (14%). CONCLUSIONS: At variance with the markers of cardiac, macrovascular and renal damage, an extremely high prevalence of retinal abnormalities (narrowings and initial arterio-venous crossings) were found in our population. If, as suggested by the WHO/ISH guidelines, these retinal abnormalities were considered as a reliable marker of target organ damage, then almost all patients would be affected by hypertensive vascular disease. Based on this evidence it is suggested that retinal abnormalities included in funduscopic grades I and II of the KWB classification should not be considered among the criteria for the quantitative detection of target organ damage.

Adult↗
PubMed2000

Teledermoscopy--results of a multicentre study on 43 pigmented skin lesions.

We performed a multicentre study to evaluate the agreement between the direct clinical diagnosis and the telediagnosis of 43 cutaneous pigmented lesions. Digital clinical and dermoscopic images of the 43 pigmented skin lesions (11 melanomas, 23 melanocytic naevi, three basal cell carcinomas, three lentigines, two seborrhoeic keratoses and one angiokeratoma) were sent by email to 11 colleagues (six dermatologists, two residents in dermatology, one oncologist, one specialist in internal medicine and one general practitioner) in 10 centres. These 11 colleagues had different degrees of experience in dermoscopy. With histopathology as the gold standard, an average of 85% of the telediagnoses were correct, with results varying from 77% to 95%, whereas face-to-face diagnosis by an expert dermatologist was correct in 91% of cases. The kappa value for all participants ranged from 0.35 to 0.87. The results confirm that teledermoscopy can be a reliable technique for the diagnosis of pigmented skin lesions but one that will depend on the expertise of the observer.

Adolescent↗
PubMed2000

Vascular network changes in the retina during ageing in normal subjects: a computerized quantitative analysis.

BACKGROUND: Direct ophthalmoscopic examination of fundus oculi is widely used for the qualitative evaluation of target organ damage in several pathological conditions. At present, there are no reliable techniques available to quantify retinal vascular damage. The aim of this study was to develop a computerized technique for the quantitative analysis of fundus oculi. METHODS: We studied 68 non-smoking, normotensive normal subjects, with a visual acuity > 8/10. From each subject retinal images were taken using a non-mydriatic ophthalmoscope and digitized onto a personal computer. In each image the area of analysis was set to a circular selection, corresponding to 25% of the whole fundus oculi, concentric with the optic disc. From each selection arterial and venous area and mean arteriolar bifurcation angle were obtained. Measurements were taken in a blinded way by two operators and, by the same operator, twice at different times. Parameters were correlated with age and body surface area. RESULTS: Retinal arterial density (arteries 7.44 +/- 1.25%; bifurcation angle 75 +/- 16 degrees) was significantly correlated with age, but not with body surface area. Intra- and interobserver coefficient of variation resulted 2.5 and 3.2%, respectively. CONCLUSIONS: Computerized analysis of the fundus oculi with the evaluation of vascular density indexes represents a simple and reproducible technique that could be useful in identifying changes in retinal vascular network during ageing.

Adolescent↗
PubMed2000

Short and long-term impact of a structured educational program on the patient's knowledge of hypertension.

BACKGROUND: It has been generally accepted that educational programs can be beneficial in the treatment of a number of chronic diseases such as diabetes mellitus as well as of cardiovascular risk factors and hypertension. We organized a structured educational intervention aimed at 1) assessing the patient's baseline knowledge of hypertension, 2) verifying the short and long-term impact of this initiative on patient's education. METHODS: We invited 174 consecutive patients referred to our hypertension outpatient clinic to participate in an educational meeting on hypertension. For organizational reasons, patients were divided into two groups, each attending a single meeting. Each meeting included four sessions: 1) in the first session a multiple choice questionnaire (nine questions, with answers collected by an interactive electronic system) was administered in order to evaluate patients' baseline knowledge of hypertension, 2) a traditional teaching session, 3) an interactive phase aimed at assessing the improvement of knowledge in which the same questions as in the first session were assessed again, 4) a general discussion session. At the end of the meeting a booklet on principal issues related to hypertension was given to each patient. In order to evaluate the long-term impact of this initiative on the patient's knowledge, 6 months later we invited the patients to answer to the same questions in a questionnaire sent to their home address. RESULTS: One hundred thirty-three patients of the 174 invited attended the meeting and 111 (57 males, 54 females, mean age 53 +/- 13 years) completed the questionnaire after 6 months. The answers to the questions in the initial session were correct in a percentage ranging from 60 to 80% (mean 68%) and immediately after the teaching session this rate increased significantly (range 75-98%, mean 90%, p < 0.05 at least, in all questions). A similar good level of knowledge was maintained in the long term (percentage of exact answers ranging from 78 to 97%, mean 88%, p < 0.05 or p < 0.01 compared to baseline). CONCLUSIONS: The findings of the present study show a positive short and long-term impact of a structured educational intervention on the patient's knowledge of issues related to arterial hypertension. The beneficial role on clinical outcomes such as blood pressure control and cardiovascular events will need future controlled trials.

Adult↗
PubMed1999

Blood pressure-independent cardiac hypertrophy in acromegalic patients.

OBJECTIVE: Acromegaly is frequently associated with an increase in left ventricular mass, even in the absence of systemic hypertension. Pathological studies on acromegalic hearts have shown an extensive interstitial fibrosis, suggesting the existence of a specific acromegalic cardiomyopathy. The aim of this study was to assess left ventricular wall structure in acromegaly by ultrasonic tissue characterization. DESIGN AND METHODS: We studied 10 untreated acromegalic patients and 10 age-matched healthy control subjects. The echo patterns of two-dimensional long-axis end-diastolic echocardiograms were assessed by colour-scale analysis of the interventricular septum, with estimates of the mean colour scale value, the broad band (Bb) and the derived collagen volume fraction (dCVF). We also measured electrocardiographic QT interval dispersion (QTd) as a marker of dyshomogeneous ventricular repolarization. RESULTS: Seven patients had left ventricular hypertrophy according to the sex-independent criteria; of these, two had arterial hypertension. None of our patients had echocardiographic evidence of diastolic or systolic dysfunction. All patients showed significantly increased myocardial echoreflectivity (Bb = 106.4+/-12.1 versus 79.3+/-6.5; dCVF% = 2.78+/-0.53 versus 1.58+/-0.29; P < 0.0001) and QTd (66+/-13 ms versus 54+/-8 ms, P < 0.05). A significant correlation was found between dCVF and the duration of acromegaly (r = 0.80; P = 0.005). CONCLUSIONS: Left ventricular remodelling observed in acromegaly is not related to the presence of arterial hypertension; we hypothesize that the increased echoreflectivity and QTd are long-term consequences of cardiac hypertrophy and prolonged exposure to high levels of growth hormone and insulin-like growth factor-I.

Acromegaly↗
PubMed1998

An improved method for coronary sinus blood flow monitoring by intravascular Doppler technique.

In order to obtain accurate measurements of coronary sinus blood flow (CSBF), a new catheter (7 French) with a radiopaque, flexible, and basket-shaped tip was developed for guiding a standard 3 Fr Doppler catheter in the coronary sinus (CS) in man. The radiopaque "basket" tip of the catheter allows the operator to stabilize the position of the Doppler transducer in the center of the CS and to accurately measure the CS internal diameter radiologically. CSBF was calculated as the product of CS cross-sectional area by mean CSBF velocity. Doppler-derived CSBF values at rest and during handgrip were compared with those obtained by the local thermodilution technique in 16 patients undergoing diagnostic coronary angiography. During handgrip, mean CSBF increased from 154+/-23 (rest) to 299+/-34 mL/min by the Doppler method and from 148+/-22 to 288+/-32 mL/min by the thermodilution technique. A good correlation (r = 0.86) between the CSBF values with the two techniques was observed. The authors conclude that the intravascular Doppler technique associated with the use of the basket guide catheter provides an accurate and simple tool for monitoring CSBF in patients.

Blood Flow Velocity↗
PubMed1998

[A multimedia echocardiographic archive].

The widespread diffusion of echocardiography requires to rationalize clinical examination archives; the recent improvement in computer processing speed and the addition of image processing capabilities on standard personal computer by using multimedia technology provide a low-cost solution to improve video digital acquisition and base management. Furthermore, the diffusion of computer networks supports the possibility of sending images in digital format from a work station to another. In this study we describe the setting-up of a system for echocardiographic image acquisition, storage, base management and analysis based on a standard multimedia Macintosh personal computer using readily available not-dedicated software. We tested the overall efficiency of this system in terms of time required to perform hardware and software procedures, storage capacity of the archive and possibility to exchange information with other wire-linked computer work-stations or via modem. This system has proven to require an acceptable time to perform all the procedures showing a high level of connectivity with other standard personal computer work-stations; however, some limitations with regard to time required in sending via modem long movie files need to be pointed out. In conclusion, in our experience new multimedia personal computer could offer to every physician with a minimum informatic knowledge the well known advantages of digital-video, at a reasonable cost.

Archives↗
PubMed1997

Analysis of microsatellite instability and loss of heterozygosity in keratoacanthoma.

We analyzed microsatellite instability (MSI) and loss of heterozygosity (LOH) at 17 microsatellite markers located on chromosomes 2p, 3p, 5q, 6q, 9p, 9q, 17p and 18q in 19 randomly selected keratoacantomas (KAS), in one cutaneous lesion that histologically could not unequivocally be differentiated from squamous cell carcinoma, and in one patient with multiple KAs of longstanding duration. The goals of our study were to determine whether, in a similar manner to some visceral carcinomas, genomic instability could be detected in KAs and to clarify whether molecular analysis might be useful to further characterize KA. MSI was observed in 2 of 21 cases (9.5%) at 5 of 17 loci examined. In one patient with a solitary KA, the presence of MSI and a family history of visceral malignant tumours suggested that the patient might have belonged to a family with Muir-Torre syndrome. In one other MSI+ KA, a definite differential diagnosis in relation to squamous cell carcinoma could not be established. In addition, one sample displayed LOH at 2 of 17 loci analysed whereas in the patient with multiple KAs, LOH at one locus was the only alteration found. In conclusion, the low frequency of MSI and LOH detected in our study suggests that these genetic events are uncommon in KA unless it is associated with a familial disease (e.g. Muir-Torre syndrome) or it has more aggressive histological features.

Aged↗
PubMed1997

Widespread microsatellite instability in sebaceous tumours of patients with the Muir-Torre syndrome.

Muir-Torre syndrome (MTS) is an autosomal dominant disorder characterized by the presence of at least one sebaceous gland tumour and a minimum of one visceral malignant tumour. Recently, microsatellite instability (MSI) has been detected in the tumours of patients with MTS and germline mutations of the hMSH2 and hMLH1 mismatch repair genes have been detected in some patients with this syndrome. To determine if the tumours of patients with MTS have widespread genomic instability and whether loss of heterozygosity (LOH) in the chromosomal regions containing hMSH2 and hMLH1 is detectable, MSI and LOH were examined at 10 dinucleotide repeats on chromosomes 2p, 3p, 5q, 9p, 17p and 18q. Data were obtained from six sebaceous gland tumours and two adenocarcinomas of the colon from three patients of two Muir-Torre families. MSI was detected at more than half of the loci tested in all sebaceous tumours examined. In addition, there was LOH at D2S119 in one sebaceoma and one sebaceous carcinoma from one patient. The colon carcinomas from two patients showed MSI at five of the 10 loci analysed. These results show that widespread MSI is a feature of tumours in patients with MTS. In addition, the finding of LOH at D2S119, a marker located in the vicinity of hMSH2, in sebaceous tumours of one patient indicates that this gene may have a pathogenetic role in this patient.

Adult↗
PubMed1995

Coronary blood flow and myocardial ischaemia in hypertension.

The aim of this investigation was to study the coronary pressure-flow relationship in 60 patients with chronic arterial hypertension of diverse aetiologies and in 14 normotensive subjects (control group). The hypertensive cohort included 6 patients with isolated systolic hypertension (ISH), 7 renovascular hypertensive patients with abnormally elevated angiotensin II plasma levels but without electrocardiographic and/or echocardiographic evidence of left ventricular hypertrophy (LVH) and 47 subjects with essential hypertension (EH), 21 of whom had LVH by electrocardiogram and/or echocardiogram. In the hypertensive cohort a Frank-Starling-like curve was found to describe the coronary pressure-flow relationship when the baseline values for coronary sinus blood flow (CBF, intravascular Doppler technique) were plotted against mean aortic pressure (intra-arterial blood pressure). In particular, the descending limb of such a curve represented a critical region where CBF was "inappropriately" low with respect to perfusion pressure. It was thus concluded that this inability of the heart to adapt CBF to its needs might account for the higher propensity to develop myocardial ischaemia encountered in severe essential hypertensive subjects with concomitant LVH and renovascular hypertensive patients.

Adult↗
PubMed1993

Coronary blood flow in renovascular hypertension.

We assessed the acute effects of 2.5 mg oral cilazapril on systemic and coronary hemodynamics in seven renovascular hypertensive patients with a chronically overactive renin-angiotensin system (RAS), but with no electrocardiographic or echocardiographic signs of left ventricular hypertrophy. Cilazapril resulted in a significant decrease in mean arterial pressure and coronary vascular resistance, together with a prolonged increase in coronary sinus blood flow (CSBF). Post-cilazapril handgrip resulted in larger increases in CSBF in response to a given increase in myocardial oxygen requirements. It is concluded that the chronic activation of the RAS exerts an adverse influence on the control mechanisms of CSBF and that converting enzyme inhibition reverses the effects of angiotensin II on coronary hemodynamics. Converting enzyme inhibitors may have a cardioprotective role in renovascular hypertension.

Adult↗
PubMed1993

Coronary hemodynamics and the renin angiotensin system.

Coronary hemodynamics were investigated invasively at rest and during handgrip exercise in two groups of mild essential hypertensive subjects and in one group of renovascular hypertensive patients. The former subjects received either furosemide (50 mg/day for one week) to ensure activation of the renin-angiotensin system or an intravenous infusion of angiotensin II (AngII) at a subpressor dose (3 ng/kg/min for 15 minutes) and at a pressor dose (13 ng/kg/min for 15 minutes). Furosemide induced a significant reduction in coronary blood flow (CBF), a significant increase in coronary vascular resistance (CVR) and also blunted the increase in CBF during handgrip exercise. Captopril restored CBF and CVR to pretreatment values. Infusion of the subpressor dose of AngII decreased myocardial oxygen supply, both at rest and during exercise; the pressor dose increased myocardial oxygen supply at rest and blunted the expected increase in myocardial oxygen supply during exercise. Converting-enzyme inhibition in renovascular hypertension caused mean arterial pressure to decrease and CBF to increase significantly. The performance of handgrip exercise after cilazapril resulted in higher increases in CBF for a given increase in myocardial oxygen requirements. These data suggest that there is a negative interference by abnormally high plasma levels AngII with myocardial perfusion and that the AngII-induced effects on coronary hemodynamics are reversed by converting enzyme inhibition.

Adult↗
PubMed1992

Coronary haemodynamic effects of angiotensin II in mild essential hypertension in man.

1. The present investigation was carried out to elucidate the possible role of the renin-angiotensin system in modulating coronary vasomotor responses in eight patients with uncomplicated mild essential hypertension with no electrocardiographic-echocardiographic evidence of left ventricular hypertrophy. 2. Systemic and coronary haemodynamics were monitored at baseline and during intravenous infusion of angiotensin II at a subpressor dose (3 ng min-1 kg-1 for 15 min) and at a pressor dose (13 ng min-1 kg-1 for 15 min) both at rest and during handgrip exercise. Infusion of the subpressor dose of angiotensin II decreased coronary sinus blood flow at rest (207 +/- 10 versus 182 +/- 9 ml/min, P less than 0.05) without a significant change in mean arterial pressure, heart rate or mean right atrial pressure. The performance of handgrip at baseline and during infusion of the subpressor dose of angiotensin II resulted in 55% (321 +/- 13 versus 207 +/- 10 ml/min) and 44% (263 +/- 16 versus 182 +/- 9 ml/min) increases in coronary sinus blood flow, respectively, in response to comparable increments in the rate-pressure product. At rest, infusion of the pressor dose of angiotensin II increased both coronary sinus blood flow (235 +/- 11 versus 207 +/- 10 ml/min, P less than 0.01) and the rate-pressure product (134 +/- 5 versus 111 +/- 8 mmHg beats/min, P less than 0.01). The increase in coronary sinus blood flow during isometric exercise was less than control (309 +/- 18 versus 321 +/- 13 ml/min, P less than 0.01). 3. It is thus concluded that (1) the opposite effects of angiotensin II on coronary blood flow are dose-dependent, and that (2) angiotensin II competes with the ability of the coronary arteries to dilate during handgrip exercise.

Adult↗