Neutralization of EP217609, a new dual-action FIIa/FXa anticoagulant, by its specific antidote avidin: a phase I study.

INTRODUCTION: EP217609 is a representative of a new class of synthetic parenteral anticoagulants with a dual mechanism of action. It combines in a single molecule a direct thrombin inhibitor and an indirect factor Xa inhibitor. EP217609 can be neutralized by a specific antidote avidin, which binds to the biotin moiety of EP217609. PURPOSE: The primary objective was to assess the neutralization of EP217609 by avidin in healthy subjects. Secondary objectives were to define the optimal avidin monomer/EP217609 molar ratio to achieve an adequate neutralization of EP217609 and to assess the safety and tolerability of EP217609 and avidin. METHODS: Healthy subjects (n = 36) were randomized to a 3 by 3 replicated Latin square design between 3 EP217609 doses (4, 8, 12 mg) and 3 avidin monomer/EP217609 molar ratios (1:1; 2:1; 3:1). EP217609 was administered as a single intravenous bolus, and avidin as a 30-min intravenous infusion, starting 90 min after EP217609 administration. RESULTS: Overall, EP217609 and avidin were well tolerated. One subject experienced a benign and transient typical pseudo-allergic reaction. The administration of EP217609 resulted in dose-dependent increases in pharmacodynamic markers. Avidin triggered a rapid and irreversible neutralization of EP217609 without rebound effect. Adequate neutralization of the anticoagulant activity was achieved with both 2:1 and 3:1 avidin monomer/EP217609 molar ratios. All safety parameters did not show any treatment-emergent clinically relevant changes or abnormalities in any dose group. CONCLUSIONS: These results will allow further investigation in patients requiring a neutralizable anticoagulant as those undergoing cardiac surgery. STUDY REGISTRATION: EudraCT number 2010-020216-10.

Attitudes of Hospital Healthcare Workers towards Influenza Vaccination in a Tertiary Hospital Setting.

The rate of uptake of seasonal influenza vaccination worldwide by healthcare workers (HCWs) has been suboptimal. Nationally, uptake among hospital HCWs was less than 20% prior to 2014. Indeed in our hospital following the 2010/2011 influenza season, a significant number of staff chose to have their vaccinations after the usual campaign period. The Occupational Health Department (OHD) undertook a questionnaire survey to determine the reason(s) for their late presentation. This was not anonymised, with a 21.7% participation rate (119 replied out of 548). We found 86(72.3%) HCWs believed influenza to be a serious illness, 84(70.6%) wanted to protect their family members and friends, and 64(53.8%) their patients from the infection. Nevertheless, 77(64.7%) were influenced by the recent media attention on the H1N1 influenza pandemic. We conclude external factors such as the arrival of the H1N1 pandemic continue to play an important role in influencing HCWs' attitudes towards receiving the vaccine.

Impact of multidisciplinary team meetings on the management of venous thromboembolism. A clinical study of 142 cases.

OBJECTIVE: Numerous guidelines have been published on the management of venous thromboembolism (VTE). However, therapeutic decision-making may prove challenging in routine clinical practice. With this in mind, multidisciplinary team (MDT) meetings have been set up in Rennes University Hospital, France. This study sought to describe the situations discussed during MDT meetings and to assess whether the meetings bring about changes in the management of these patients. MATERIALS AND METHODS: A retrospective single-center study conducted at the Rennes University Hospital included cases presented from the beginning of the MDT meetings (February 2015) up to May 2017. RESULTS: In total, 142 cases were presented in 15 MDT meetings, corresponding to a mean of 10±4 cases per meeting. Of these, 129 related to VTE patients: 33 provoked VTEs, 22 unprovoked VTEs, 49 cancer-related VTEs, and 25 unspecified VTEs. MDT meetings led to significant changes in the anticoagulation type (therapeutic, prophylactic, or discontinuation) and duration, but not in the anticoagulant choice (direct oral anticoagulants, vitamin K antagonists, heparins, etc.). CONCLUSION: Requests for MDT meetings are made for all VTE types, and these meetings have an impact on VTE management.

[Recommendations for training in cross-sectional cardiac imaging]. / Recommandations pour la formation en imagerie en coupes du coeur et des vaisseaux.

The recent and future advancements that are known in the field of cardiac imaging imply an optimal training of the operators. This training concerns medical specialists whether originating from radiology or cardiology. The training of the medical specialists in cardiac imaging entitles 3 main essential steps: The basic training taking place within each specialty, allowing the fellow to get acquainted with the clinical and technical basics. The specialized training, delivered principally in post-residency. This training must include an upgrading of each specialty in the domain that does not concern it (a technical base for the cardiologist, a physio-pathological and clinical base for the radiologist). It must include a specific theoretical training covering all aspects of cardiac imaging as well as practical training in a certified training centre. The continuous medical training and maintenance of skills that allow a sustained activity in the field and the obligation to regularly participate in the actions of specific validated training. The different aspects of these rules are exposed in this chapter.

[Prolongation of anti vitamin K treatment for 18 months versus placebo after 6 months treatment of a first episode of ideopathic pulmonary embolism: a mutlicentre, randomised double blind trail. The PADIS-EP Trial]. / Prolongation d'un traitement par antivitamine K pendant dix-huit mois versus placebo au décours d'un premier épisode d'embolie pulmonaire idiopathique traité six mois: un essai randomisé multicentrique en double aveugle. Essai "PADIS-EP".

BACKGROUND: After stopping a 3 to 6 months course of oral anticoagulation for a first episode of idiopathic venous thromboembolism (VTE), the risk of recurrent VTE is high (10% per year). In this setting, international guidelines recommend at least 6 months treatment. However, this recommendation is not satisfactory for the following reasons: (1) no randomized trial has compared 6 months to extended duration (2 years) anticoagulation; and (2), even though the frequency of recurrent VTE is similar after pulmonary embolism (PE) and deep vein thrombosis (DVT), the fatality rate of recurrent VTE after PE is higher than that after DVT. METHODS: A French multicentre double blind randomized trial. The main objective is to demonstrate, after a first episode of symptomatic idiopathic PE treated for 6 months using a vitamin K antagonist, that extended anticoagulation for 18 months (INR between 2 and 3) is associated with an increased benefit / risk ratio (recurrent VTE and severe anticoagulant-related bleeding) compared to placebo. The double blind evaluation is ensured using by active warfarin and placebo, and blinded INR. The protocol was approved by the ethics board of the Brest Hospital on the 7th of March 2006. For an alpha risk of 5% and a beta risk of 20%, the estimated sample size is 374 patients. EXPECTED RESULTS: This study has the potential to: (1) demonstrate that the benefit / risk ratio of extended anticoagulation for 18 months is higher than that observed with placebo in patients with a first episode of idiopathic PE initially treated for 6 months, during and after the treatment period; and (2) to validate or invalidate the contribution of isotope lung scans, lower limb Doppler ultrasound and D-Dimer at 6 months of treatment as predictors of recurrent VTE (medico-economic analysis included).

Prospective evaluation of the '4Ts' score and particle gel immunoassay specific to heparin/PF4 for the diagnosis of heparin-induced thrombocytopenia.

BACKGROUND: Heparin-induced thrombocytopenia (HIT) is a severe disease that is often difficult to diagnose. A clinical scoring system, the '4Ts' score, has been proposed to estimate its probability before laboratory testing, and a particle gel immunoassay (H/PF4 PaGIA) has also been developed for rapid detection of HIT antibodies. AIM: To evaluate the performance of both methods when HIT is suspected clinically. METHODS: Two hundred thirteen consecutive patients were included in four centers. The probability of HIT was evaluated using the 4Ts score blind to antibody test results. HIT was confirmed only when the serotonin release assay (SRA) was positive. RESULTS: The risk of HIT was evaluated by the 4Ts score as low (LowR), intermediate (IR) or high (HR) in 34.7%, 60.6% and 4.7% of patients, respectively. The negative predictive value (NPV) of the 4Ts score was 100%, as the SRA was negative in all LowR patients. PaGIA was negative in 176 patients without HIT (99.4%, NPV) and the negative likelihood ratio (LR-) was 0.05. PaGIA was positive in 37 patients, including 21 with HIT (positive predictive value = 56.8%), with a positive LR of 11.4. A negative PaGIA result decreased the probability of HIT in IR patients from 10.9% before assay to 0.6%, whereas a positive result did not substantially increase the likelihood for HIT. CONCLUSION: The use of the 4Ts score with PaGIA appears to be a reliable strategy to rule out HIT.

[Evaluation of left ventricular function: echocardiography, MRI or CT?]. / Evaluation de la fonction ventriculaire gauche: échocardiographie, IRM ou scanner?

The objective of this article is to clarify the advantages and limits of echocardiography, MRI, and CT for the determination of left ventricular (LV) function, emphasising the importance of evaluating global ventricular function. MRI is the reference technique, owing to its precision, reproducibility, and innocuous nature. However, echography is performed much more frequently because it is more widely available and easier to carry out. It is our reference technique in everyday practice. More recently, synchronised multi-slice tomodensitometry has provided dynamic reconstructed images of the left ventricle throughout the cardiac cycle, offering a succession of short axis views covering the entire volume of the ventricle. These acquisitions, in addition to non-invasive coronary angiography, allow the LV ejection fraction to be determined. With MRI, study of the LV function does not require any contrast medium to be injected and makes use of effective semi-automatic segmentation programs.

High risk hypertensives: pre-hospital management of acute myocardial infarction--results from the French nationwide registry USIC 2000.

OBJECTIVE: To assess the use of mobile coronary care units (MCU) in hypertensive patients previously treated for cardiovascular diseases in comparison with those with no history of cardiovascular disease and to estimate the influence of the use of MCU on cardiovascular outcome in this population. PATIENTS: We used a nationwide prospective registry of all patients admitted for AMI in French intensive care units in 2000. Patients without history of hypertension or patients admitted with pulmonary oedema or cardiogenic shock were excluded. Men (N = 514) and women (N = 291) were analysed separately. RESULTS: The proportion of patients with history of myocardial infarction, peripheral artery disease and stroke was not significantly higher in subjects who used physician-staffed MCU as compared with patients with no history of myocardial infarction, peripheral artery disease or stroke. In each sex, revascularization (pre hospital fibrinolysis, in hospital fibrinolysis or coronary angioplasty) were more frequent in patients who used MCU. Also, one year cardiovascular mortality was lower in men who used MCU. CONCLUSION: Known high risk hypertensive patients did not use physician-staffed MCU more than subjects free of such condition. Education of hypertensive patients at risk during routine visits is required to increase of the use of physician-staffed MCU in case of symptoms suggestive of AMI.

[Hereditary thrombophilia testing and its therapeutic impact on venous thromboembolism disease: Results from a retrospective single-center study of 162 patients]. / La recherche de thrombophilie héréditaire et son impact thérapeutique dans la maladie thromboembolique veineuse : résultats d'une étude monocentrique rétrospective sur 162 patients.

INTRODUCTION: Venous thromboembolic disease is a multifactorial, frequently recurrent pathology, whose treatment is based on anticoagulation. As part of the etiological investigation, screening for an inherited thrombophilia is framed by French guidelines published in 2009. The aim of the study is to assess the contribution of inherited thrombophilias testing in common practice. METHOD: This is a retrospective single-center observational study. Over a period of a year, all records of patients who were screened for a hereditary thrombophilia were analyzed. The conformity of the indication of hereditary thrombophilia workup in balance with the guidelines, its completeness and therapeutic impact were studied. RESULTS: Of the 494 records analyzed, 225 were related to venous thromboembolism. Among them, there were 162 pulmonary embolisms or deep vein thrombosis of the lower limbs. In this subgroup, 57 % of records complied with guidelines and 69 % were complete. Thirty-four thrombophilias were highlighted: 4 protein S deficiencies, 1 protein C deficiency, 4 combined deficiencies, 17 factor V Leiden mutations and 8 factor II G20210A mutations. For one patient, hereditary thrombophilia diagnosis had profoundly changed the curative therapeutic approach. CONCLUSION: Adherence to French guidelines remains limited. In clinical practice, diagnosis of hereditary thrombophilia has little impact on the curative therapeutic approach in venous thromboembolic disease.

The coronary calcium score is a more accurate predictor of significant coronary stenosis than conventional risk factors in symptomatic patients: Euro-CCAD study.

AIMS: In this retrospective study we assessed the predictive value of the coronary calcium score for significant (>50%) stenosis relative to conventional risk factors. METHODS AND RESULTS: We investigated 5515 symptomatic patients from Denmark, France, Germany, Italy, Spain and the USA. All had risk factor assessment, computed tomographic coronary angiogram (CTCA) or conventional angiography and a CT scan for coronary artery calcium (CAC) scoring. 1539 (27.9%) patients had significant stenosis, 5.5% of whom had zero CAC. In 5074 patients, multiple binary regression showed the most important predictor of significant stenosis to be male gender (B=1.07) followed by diabetes mellitus (B=0.70) smoking, hypercholesterolaemia, hypertension, family history of CAD and age but not obesity. When the log transformed CAC score was included, it became the most powerful predictor (B=1.25), followed by male gender (B=0.48), diabetes, smoking, family history and age but hypercholesterolaemia and hypertension lost significance. The CAC score is a more accurate predictor of >50% stenosis than risk factors regardless of the means of assessment of stenosis. The sensitivity of risk factors, CAC score and the combination for prediction of >50% stenosis when measured by conventional angiogram was considerably higher than when assessed by CTCA but the specificity was considerably higher when assessed by CTCA. The accuracy of CTCA for predicting >50% stenosis using the CAC score alone was higher (AUC=0.85) than using a combination of the CAC score and risk factors with conventional angiography (AUC=0.81). CONCLUSION: In symptomatic patients, the CAC score is a more accurate predictor of significant coronary stenosis than conventional risk factors.

Gender and age effects on risk factor-based prediction of coronary artery calcium in symptomatic patients: A Euro-CCAD study.

BACKGROUND AND AIMS: The influence of gender and age on risk factor prediction of coronary artery calcification (CAC) in symptomatic patients is unclear. METHODS: From the European Calcific Coronary Artery Disease (EURO-CCAD) cohort, we retrospectively investigated 6309 symptomatic patients, 62% male, from Denmark, France, Germany, Italy, Spain and USA. All of them underwent risk factor assessment and CT scanning for CAC scoring. RESULTS: The prevalence of CAC among females was lower than among males in all age groups. Using multivariate logistic regression, age, dyslipidaemia, hypertension, diabetes and smoking were independently predictive of CAC presence in both genders. In addition to a progressive increase in CAC with age, the most important predictors of CAC presence were dyslipidaemia and diabetes (ß = 0.64 and 0.63, respectively) in males and diabetes (ß = 1.08) followed by smoking (ß = 0.68) in females; these same risk factors were also important in predicting increasing CAC scores. There was no difference in the predictive ability of diabetes, hypertension and dyslipidaemia in either gender for CAC presence in patients aged <50 and 50-70 years. However, in patients aged >70, only dyslipidaemia predicted CAC presence in males and only smoking and diabetes were predictive in females. CONCLUSIONS: In symptomatic patients, there are significant differences in the ability of conventional risk factors to predict CAC presence between genders and between patients aged <70 and ≥70, indicating the important role of age in predicting CAC presence.

Quantitative two-dimensional echocardiography in massive pulmonary embolism: emphasis on ventricular interdependence and leftward septal displacement.

In 14 patients requiring aggressive therapy for circulatory failure resulting from massive pulmonary embolism, hemodynamic and two-dimensional echocardiographic data were obtained at bedside (acute phase) and again after circulatory improvement (intermediate phase) and during recovery. The acute stage was characterized by a low cardiac output state despite inotropic support (cardiac index 1.9 +/- 0.6 liters/min per m2) associated with increased right atrial pressure (12.4 +/- 4.2 mm Hg), increased right ventricular end-systolic and end-diastolic area (12.4 +/- 3.4 and 15.4 +/- 4.1 cm2/m2, respectively) and reduced right ventricular fractional area contraction (20.1 +/- 8.6%). Two-dimensional echocardiography also revealed interventricular septal flattening at both end-systole and end-diastole and markedly decreased left ventricular end-diastolic dimensions. Left ventricular fractional area contraction remained normal. Hemodynamic improvement occurred during the intermediate phase as shown by restoration of cardiac index (3.3 +/- 0.6 liters/min per m2), decrease in right atrial pressure (8.3 +/- 4.8 mm Hg), reduction in right ventricular end-systolic area (9.0 +/- 3.6 cm2/m2 at the intermediate stage and 6.1 +/- 1.8 cm2/m2 at recovery) and end-diastolic area (10.5 +/- 3.6 cm2/m2 at the intermediate stage and 8.9 +/- 2.9 cm2/m2 at recovery) and improvement in right ventricular fractional area contraction (31.5 +/- 16.4%). The interventricular septum progressively returned to a more normal configuration at both end-systole and end-diastole, and left ventricular diastolic dimension steadily increased. It is concluded that circulatory failure secondary to massive pulmonary embolism was mediated through a profound decrease in left ventricular preload, resulting from both pulmonary outflow obstruction and reduced left ventricular diastolic compliance.(ABSTRACT TRUNCATED AT 250 WORDS)

Aneurysms of sinus of Valsalva: two-dimensional echocardiographic diagnosis and recognition of rupture into the right heart cavities.

The aim of this study was to evaluate the role of echocardiography in the diagnosis of sinus of Valsalva aneurysms projecting toward the right heart cavities. Three patients who had a ruptured aneurysm of a sinus of Valsalva diagnosed by echocardiography and confirmed by catheterization underwent cardiac surgery. In two patients, the aneurysm originated from the right coronary sinus and had perforated into either the inflow or outflow tract of the right ventricle. In the third patient, the aneurysm, which originated from the noncoronary sinus, ruptured into the atrium. A fourth patient was also investigated and had an unruptured aneurysm of the right coronary sinus projecting into the right ventricular outflow tract. M-mode, two-dimensional and contrast echocardiographic studies were performed before cardiac catheterization in all patients and after surgery in three patients. M-mode echocardiography was useful only when the aneurysm had an anterior projection, whether or not the aneurysm was ruptured. Conversely, two-dimensional echocardiography was always able to identify the aneurysmal sac which appeared as an abnormal circular thin-walled structure protruding into the right heart cavities. By using multiple views, it was possible to investigate the whole abnormal structure and locate the sinus from which the aneurysm originated. The use of the echo contrast technique allowed more precise definition of the aneurysmal sac and diagnosis of a left to right shunt by demonstrating a negative contrast image in the right cavities. On the other hand, no negative contrast image was recorded in the patient with an unruptured aneurysm or in the two instances of a successful surgically reconstructed aorta.

Aortic stenosis with severe left ventricular dysfunction and low transvalvular pressure gradients: risk stratification by low-dose dobutamine echocardiography.

OBJECTIVES: We sought to assess risk stratification by using dobutamine stress echocardiography (DSE) in patients with aortic stenosis (AS) and severe left ventricular (LV) dysfunction. BACKGROUND: Few data are available on risk stratification for valve replacement in patients with AS, LV dysfunction and low transvalvular gradients. METHODS: Low-dose DSE was performed in 45 patients (16 women and 29 men; median [quartile range] age in years: 75 [69 to 79]; left ventricular ejection fraction: 0.29 [0.23 to 0.32]; aortic valve area [cm2]: 0.7 [0.5 to 0.8]; mean transaortic gradient [mm Hg]: 26 [21 to 33]). Patients were classified into two groups: group I (n = 32, LV contractile reserve on DSE) and group II (n = 13, no contractile reserve). Valve replacement was performed in 24 and 6 patients in groups I and II, respectively. RESULTS: Perioperative mortality was 8% in group I and 50% in group II (p = 0.014). Survival at five years after the operation was 88% in group I. Compared with medical therapy, valve surgery was associated with better long-term survival in group I (hazard ratio for death [HR-D] 0.13, 95% confidence interval [CI] 0.002 to 0.49) and reduced survival in group II (HR-D 19.6, 95% CI 2.7 to 142). The effect of valve surgery on survival remained significant in both groups after adjustment for age, diabetes, respiratory disease and hypertension. Medical therapy had the same effect in both groups. CONCLUSIONS: In patients with AS, LV dysfunction and low transvalvular gradients, contractile reserve on DSE is associated with a low operative risk and good long-term prognosis after valve surgery. In contrast, operative mortality remains high in the absence of contractile reserve.

Effects of full-dose heparin anticoagulation on the development of left ventricular thrombosis in acute transmural myocardial infarction.

The incidence of left ventricular thrombosis after acute transmural myocardial infarction has been evaluated with two-dimensional echocardiography. To assess the preventive action of early anticoagulation with full-dose heparin, 90 patients, admitted within 5.2 +/- 4.6 hours after the onset of symptoms of their first episode of acute myocardial infarction (46 anterior and 44 inferior), were prospectively studied. Patients were randomly assigned either to therapeutic anticoagulation with heparin or to no anticoagulant therapy. Serial two-dimensional echocardiograms were recorded on the day of admission, the next day, days 4 to 7 and days 20 to 50 to detect left ventricular thrombus and to assess global left ventricular performance. On the first echocardiogram (10.3 +/- 8.0 hours after the onset of symptoms) no thrombus was visualized. In 44 patients with inferior myocardial infarction (23 receiving heparin and 21 not receiving heparin) no further left ventricular thrombus developed. In 46 patients with anterior myocardial infarction, 21 additional thrombi developed (45.6%) within 4.3 +/- 3.0 days after the acute event. Thrombus developed in 8 (38%) of 21 patients receiving heparin, compared with 13 (52%) of 25 patients not receiving heparin. This difference in ventricular thrombosis was not statistically significant (chi-square with the Yates correction = 0.76; NS). No difference was found between the subgroups in terms of clinical variables, infarct size, hemodynamic impairment, intensity of the inflammatory process and quantitative two-dimensional echocardiographic and cineangiographic left ventricular function. It is concluded that early anticoagulation with heparin reduced by 27% the incidence of left ventricular thrombus formation in anterior acute transmural myocardial infarction, and this relative risk reduction was not statistically significant when compared with findings in the untreated group.

Contrast echocardiographic visualization of cough-induced right to left shunt through a patent foramen ovale.

In a series of 24 consecutive patients referred to the echocardiography laboratory because of suspected patent foramen ovale, contrast two-dimensional and M-mode echocardiographic studies were performed during normal breathing and during two provocative tests: the Valsalva maneuver and cough. A right to left shunt was visualized in 8 patients during normal breathing, in 11 patients during the Valsalva maneuver and in 17 patients during the cough test. Cardiac catheterization performed in all 24 patients and postmortem examination available in 3 patients confirmed the patency of the foramen ovale in only 15 patients. In these 15 patients, echo contrast appeared in the left heart cavities in early systole and almost simultaneously with complete right heart opacification. In contrast, for the two false positive results during the cough test, ultrasound contrast appeared at any time of the cardiac cycle when the right heart cavities had been partially cleared of contrast material. Right and left atrial pressures were simultaneously measured in four patients, and the normal interatrial pressure gradient was reversed during the Valsalva maneuver and the cough test. Echocardiography during both provocative tests showed that the interatrial septum flattened or became convex toward the left atrium. The cough test appears to be more reliable and easier to perform in critically ill patients than the Valsalva maneuver for the detection of right to left shunting through a patent foramen ovale.

Endogenous sodium-potassium-chloride cotransport inhibitor in congestive heart failure.

OBJECTIVES: This study sought to evaluate the relation, if any, between fluid overload in congestive heart failure (CHF) and a newly discovered endogenous natriuretic factor acting like loop diuretic drugs: cotransport inhibitory factor (CIF). BACKGROUND: The humoral mechanisms regulating volume overload in CHF are not fully understood. Therefore, we investigated whether there is a role for CIF in this pathologic condition. METHODS: Plasma and urinary CIF levels were investigated in 23 patients with chronic CHF and compared with changes in plasma atrial natriuretic peptide (ANP). Twelve patients without CHF served as control subjects. RESULTS: CHF was associated with a highly significant threefold increase in both plasma CIF levels (mean +/- SD 7.10 +/- 3.01 vs. 2.28 +/- 0.92 U/ml, p < 0.0001) and urinary CIF excretion (7,849 +/- 3,600 vs. 2,351 +/- 1,297 U/day, p < 0.0001) with respect to patients without CHF. CIF increased as a function of impairment in left ventricular ejection fraction (r = -0.703, p < 0.0001) and the severity of clinical status. Plasma ANP was also increased in patients with CHF, although to a lesser extent (68%, p = 0.0501) than plasma CIF, and was also significantly correlated with left ventricular ejection fraction (r = -0.552, p = 0.0004). CONCLUSIONS: Plasma and urinary CIF activities were strongly and very significantly increased in chronic CHF. In addition to ANP, this long-term natriuretic agent may be of potential importance in reducing fluid overload in CHF.

Alteration of left ventricular diastolic function during coronary angioplasty-induced ischemia: a color M-mode Doppler study.

OBJECTIVES: The aim of this study was to assess the effects of ischemia on diastolic function by analyzing flow propagation velocity with color M-mode Doppler echocardigraphy. BACKGROUND: Color M-mode Doppler echocardiography has been proposed as a method of assessing left ventricular filling. METHODS: Color M-mode Doppler echocardiography and measurement of hemodynamic data were performed simultaneously at baseline and during angioplasty-induced ischemia. Tau was compared with flow propagation velocity. Late diastolic indexes, left ventricular pressure and flow cessation time were also investigated. RESULTS: During ischemia, left ventricular relaxation rate (tau) increased, whereas flow propagation velocity decreased, from (mean +/- SD) 46.8 +/- 10 ms to 72.6 +/- 18.3 ms and from 59.8 +/- 15.8 cm/s to 30 +/- 8 cm/s, respectively (all p < 0.0001). The maximal slowing of flow propagation velocity was observed 20 to 30 s after the beginning of the inflation, coexisting with a notch on the ascending limb of the negative rate of rise of the left ventricular pressure (dP/dt) curve. Flow propagation velocity was correlated with tau both at baseline (r = 0.53, p < 0.05) and during inflation (r = 0.53, p < 0.03). Left ventricular end-diastolic pressure increased during ischemia from 13.5 +/- 8 mm Hg at baseline to 27.5 +/- 7 mm Hg, while a premature cessation of the entering flow occurred -13.8 +/- 23 ms before the next Q wave onset, compared with 4.5 +/- 19.6 ms after the Q wave onset at baseline (all p < 0.0001). CONCLUSIONS: The analysis of flow propagation velocity showed that early filling is highly dependent on left ventricular relaxation rate, particularly through the phenomenon of asynchrony. During ischemia, the premature cessation of late filling is associated with increased diastolic pressures.

Prediction of functional recovery of viable myocardium after delayed revascularization in postinfarction patients: accuracy of dobutamine stress echocardiography and influence of long-term vessel patency.

OBJECTIVES: We sought to evaluate dobutamine stress echocardiography (DSE) for predicting recovery of viable myocardium after revascularization with cineangiography as a gold standard for left ventricular (LV) function. We studied the influence of late vessel reocclusion on regional LV function. BACKGROUND: Dobutamine stress echocardiography is a well established evaluation method for myocardial viability assessment. In previous studies the reference method for assessing LV recovery was echocardiography, long-term vessel patency has not been systematically addressed. METHODS: Sixty-eight patients with a first acute myocardial infarction (AMI) and residual stenosis of the infarct related artery (IRA) underwent DSE (mean +/- standard deviation) 21 +/- 12 days after AMI to evaluate myocardial viability. Revascularization of the IRA was performed in 54 patients by angioplasty (n = 43) or bypass grafting (n = 11). Coronary angiography and LV cineangiography were repeated at four months to assess LV function and IRA patency. RESULTS: Sensitivity and specificity of DSE for predicting myocardial recovery after revascularization were 83% and 82%. In the case of late IRA patency, specificity increased to 95%, whereas sensitivity remained unchanged. In the 16 patients with myocardial viability and late IRA patency, echocardiographic wall motion score index decreased after revascularization from 1.83 +/- 0.15 to 1.36 +/- 0.17 (p = 0.0001), and left ventricular ejection fraction (LVEF) increased from 0.52 +/- 0.06 to 0.57 +/- 0.06 (p = 0.0004), whereas in five patients, reocclusion of the IRA prevented improvement of segmental or global LV function despite initially viable myocardium. CONCLUSIONS: Dobutamine stress echocardiography is reliable to predict recovery of viable myocardium after revascularization in postinfarction patients. Late reocclusion of the IRA may prevent LV recovery and influence the accuracy of DSE.

[Echocardiography and mechanical complications of recent myocardial infarction]. / Echocardiographie et complications mécaniques de l'infarctus du myocarde récent.

The constantly advancing technology of echocardiography and its widespread usage in the intensive care unit has made it a routine examination in patients with acute myocardial infarction. It has become the reference method for diagnosis and monitoring of certain complications such as pericardial effusion, intra-ventricular thrombosis, ventricular aneurysm and mitral regurgitation. The echocardiographic description of these complications dates back to the 1980s during which prospective studies accurately described the principal abnormalities. These descriptions have not been much improved upon with the advent of new technology. On the other hand, the frequency of these complications assessed in an era when reperfusion by thrombolysis or primary angioplasty was much less common than today, has considerably decreased.