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Biomedical subjects

D G Blanchard

Publications and source records attributed to D G Blanchard.

At least 19 recordsLinked to original sources
PubMed2001

Dilation of the coronary sinus on echocardiogram: prevalence and significance in patients with chronic pulmonary hypertension.

BACKGROUND: Although rarely seen in healthy patients, the coronary sinus (CS) is often visualized on echocardiography in patients with right-sided heart disease. However, the prevalence of this finding and its relation to right-sided heart structure and pressure remains undefined. METHODS: We examined the transthoracic echocardiograms of 43 consecutive patients referred for the evaluation of pulmonary hypertension (26 men, 17 women) with a mean age of 53 +/- 15 years (range 21 to 82 years). Structural abnormalities of the tricuspid valve were absent. All patients underwent right heart catheterization within 48 hours of their echocardiogram, which revealed the following pressures: mean pulmonary artery (50 mm Hg, range 31 to 84 mm Hg) and right atrial (RA) (mean 10, range 1 to 24 mm Hg). Echocardiograms were analyzed for CS size (identified as the smallest diameter of a circular structure in the left atrioventricular groove in the parasternal long-axis view), as well as RA and right ventricular (RV) sizes. The presence and severity (grades 1 through 3) of tricuspid regurgitation (TR) were also recorded. RESULTS: The CS was visualized in 35 (81%) of 43 patients, and measurements ranged from 0.4 to 1.6 cm (mean 0.8 cm). No difference in RA size, RV size, TR grade, RA pressure (RAP), RV pressure (RVP), mean pulmonary artery pressure (PAP), or pulmonary vascular resistance (PVR) was observed between patients with a visualized and nonvisualized CS. Coronary sinus size correlated significantly with RA size (r = 0.60, P <.001) and pressure (r = 0.59, P <.001), but not with RV size, degree of TR, RVP, PAP, or PVR. Nineteen of 35 patients with a visualized CS underwent pulmonary artery thromboendarterectomy (PTE), and their CS size and RAP were unchanged (0.8 cm and 12 mm Hg, respectively, preand post-PTE; both P = NS [not significant]), though a decrease was observed in other measurements: RA size (4.2 versus 4.8 cm, P =.02), RV size (4.2 versus 5.1 cm, P =.0004), mean PAP (37 versus 72 mm Hg, P <.0001), and PVR (230 versus 899 mm Hg, P <.0001). CONCLUSIONS: Coronary sinus dilation was observed in 81% of a selected group of patients with pulmonary hypertension in the absence of structural disease of the tricuspid valve. Coronary sinus dilation is related to RAP and RA size, but not to RV size, degree of TR, RVP, PA pressure, or PVR. Once dilated, CS size does not change shortly after decreases of RA size, RV size, or PA pressure produced by PTE.

Adult↗
PubMed2001

Eustachian valve endocarditis: a case series and analysis of the literature.

Eustachian valve endocarditis (EVE) is a syndrome characterized by clinical signs and symptoms of right-sided infective endocarditis in association with an infective vegetation on the eustachian valve. EVE usually occurs without associated involvement of any other cardiac valves, and it is difficult to diagnose accurately by transthoracic echocardiography. Transesophageal echocardiography appears to be a more sensitive tool for the diagnosis of EVE, and it is recommended when a patient with typical signs of right-sided endocarditis has normal results on a transthoracic echocardiography study. In general, EVE responds well to conventional antibiotic therapy.

Adult↗
PubMed2001

Aortic intramural hematoma: an increasingly recognized and potentially fatal entity.

Aortic intramural hematoma (IMH) is related to but is pathologically distinct from aortic dissection. In this potentially lethal entity, there is hemorrhage into the aortic media in the absence of an intimal tear. Although intimal disruption is not present, the prognosis is similar to that of classic aortic dissection; therefore, early diagnosis is critical. In this review, symptoms and prognosis of aortic IMH are discussed, as well as current diagnostic techniques and therapy.

Aortic Dissection↗
PubMed1998

Infrahepatic interruption of the inferior vena cava with azygos continuation: a potential mimicker of aortic pathology.

Infrahepatic interruption of the inferior vena cava (IVC) with azygos or hemiazygos continuation is a rare finding. In this anatomic entity, the intrahepatic segment of the IVC is absent, and the hepatic veins empty directly into the right atrium. Venous blood flow from the lower body is directed from the IVC into the azygos system at the level of the renal veins, with resultant dilation of the azygos and/or hemiazygos veins. Because these enlarged vessels lie parallel to the descending thoracic aorta, they may be mistaken for aortic pathology (dissection, aneurysm, or rupture) during transesophageal echocardiography (TEE). We describe a case of azygos continuation of the IVC initially misdiagnosed by TEE as partial aortic rupture. Repeat TEE with intravenous agitated saline injection correctly identified the condition, and the echocardiographic features are described.

Aorta, Thoracic↗
PubMed1997

Eustachian valve endocarditis: detection with multiplane transesophageal echocardiography.

Right-sided involvement is fairly common in infective endocarditis, but involvement of the eustachian valve is distinctly rare. We present the case of a 36-year-old intravenous drug user with staphylococcal bacteremia and septic pulmonary emboli. Transthoracic echocardiography was normal, but transesophageal echocardiography revealed a large eustachian valve vegetation. This case illustrates the utility of multiplane transesophageal echocardiography in the evaluation of eustachian valve pathology.

Adult↗
PubMed1997

Diagnosis and management of patients with peripheral macroemboli from thoracic aortic pathology.

Transesophageal echocardiography (TEE) has improved the detection of thoracic aortic pathology and further elucidated its role as a source of peripheral arterial emboli. Since 1993 we have used TEE to evaluate the thoracic aorta in patients with peripheral emboli without identifiable cardiac sources. Five patients suffered a total of eight embolic events originating from thoracic aortic mural thrombus (TAMT). The four females and one male ranged in age from 56 to 82 years. Emboli occurred to the upper extremities in four instances, lower extremities in three instances, and the visceral vessels in a single instance. Thromboembolectomy was performed in each case except for a patient who initially underwent aortobifemoral bypass. He was discovered to have TAMT after a subsequent embolic event. All patients were anticoagulated after TAMT was identified but in one case anticoagulants were discontinued after an intraabdominal hemorrhage. All patients are alive without limb loss while one patient has experienced recurrent embolization despite anticoagulation. TEE is a sensitive and useful diagnostic modality in patients with "cryptogenic" arterial embolization. Whether surgical management or anticoagulation for the primary lesion is optimal therapy remains a question. However, anticoagulation appears effective in this small experience.

Aged↗
PubMed1997

Gonococcal endocarditis: assessment by transesophageal echocardiography.

Gonococcal endocarditis is a rare but aggressive infection that has an alarming rate of perivalvular abscess and mortality. We present a case of gonococcal endocarditis with intracardiac abscess and fistula diagnosed by transesophageal echocardiography. Given the often acute nature of gonococcal endocarditis and its propensity toward abscess formation, transesophageal echocardiography should be considered early in the course of this infection.

Abscess↗
PubMed1994

Transesophageal echocardiography of the aorta.

Transesophageal echocardiography (TEE) has become a widely used imaging technique for evaluating cardiac structure, function, and valvular anatomy. Transesophageal echocardiography has also provided a new perspective on the thoracic aorta, and there is growing evidence that the technique contributes valuable and sometimes unique information about aortic structure and pathology. Recently introduced multiplane transesophageal probes have improved visualization of the proximal and transverse aorta, but few comprehensive discussions of TEE's application in aortic disease exist. Therefore, we have reviewed the published literature and our institutional experience in transesophageal aortic ultrasonography. The available evidence strongly supports the use of TEE in aortic dissection and atherosclerosis and suggests potential utility in additional diseases of the aorta such as aneurysm, ulceration, trauma, and congenital or inherited malformation.

Aortic Dissection↗
PubMed1994

Cardiac structure and function in chronic thromboembolic pulmonary hypertension.

The observations made on patients with chronic TE-PH conform with the work of others who have shown marked right-sided cardiac chamber enlargement and abnormal left-sided diastolic function in patients with other forms of PH and RV pressure overload. The unique results from our patient population are a consequence of the reversal of these structural and functional abnormalities early after surgical treatment of the PH. The reversal of these abnormalities, including normalization of RV function, is extremely important when considering forms of therapy such as isolated lung transplantation, where a failure of RV function to normalize would be catastrophic. Although echocardiography is currently limited by its data acquisition in two dimensions, the results concerning measurements of area and length, rather than volume, are convincing. It is anticipated that future application with techniques such as three-dimensional reconstruction of echocardiographic images will allow an even more thorough evaluation of the cardiac structural and functional changes in patients with thromboembolic pulmonary hypertension.

Chronic Disease↗
PubMed1993

Acute anuric renal failure: a complication of combined thrombolytic and antithrombotic therapy.

Thrombolytic agents are routinely given to patients with acute myocardial infarction, often in combination with heparin. Genitourinary hemorrhage is an uncommon adverse effect of systemic thrombolysis, and acute azotemic complications are distinctly rare. We describe a case of genitourinary hemorrhage after combined thrombolytic and antithrombotic therapy leading to acute bilateral ureteral obstruction and then briefly review renal complications of systemic thrombolysis.

Acute Kidney Injury↗
PubMed1992

Pericardial adaptation in severe chronic pulmonary hypertension. An intraoperative transesophageal echocardiographic study.

BACKGROUND: The pericardium both limits cardiac distension and accentuates ventricular interdependence. Although this effect appears minimal under normal circumstances, the pericardium markedly restricts acute cardiac enlargement. Animal studies have demonstrated gradual pericardial adaptation and expansion in chronic volume overload and cardiomegaly, but the pericardial response in humans with cardiac hypertrophy and enlargement has not been examined fully. To investigate this further, 14 patients with right ventricular hypertrophy and cardiomegaly secondary to chronic pulmonary thromboembolic disease and severe pulmonary hypertension were studied during pulmonary thromboendarterectomy. METHODS AND RESULTS: Simultaneous intraoperative transesophageal Doppler echocardiography and direct biventricular hemodynamic measurements were performed at steady state immediately before and after pericardiotomy. All hemodynamic variables showed no significant change before and after pericardiotomy, including heart rate (76 +/- 16 versus 75 +/- 15 beats per minute), mean pulmonary arterial pressure (46.3 +/- 11.1 versus 45.5 +/- 11.7 mm Hg), cardiac index (1.8 +/- 0.5 versus 2.0 +/- 0.6 l/min/m2), left ventricular end-diastolic pressure (5.9 +/- 5.7 versus 7.1 +/- 5.0 mm Hg), and right ventricular end-diastolic pressure (7.9 +/- 6.6 versus 8.0 +/- 6.7 mm Hg). Similarly, there were no significant changes in all Doppler echocardiographic parameters, including right ventricular end-diastolic area (23.2 +/- 5.7 versus 22.6 +/- 5.4 cm2), left ventricular end-diastolic area (15.3 +/- 5.9 versus 15.5 +/- 4.4 cm2), the position of the interventricular septum, and the Doppler-derived mitral inflow measures of diastolic function. CONCLUSIONS: The pericardium appears to have little influence on the marked cardiac and septal deformations seen in patients with chronic, severe right ventricular pressure overload and cardiomegaly. This study confirms that the human pericardium is capable of adapting over time to changes in cardiac size and geometry.

Adaptation, Physiological↗
PubMed1992

Nonbacterial thrombotic endocarditis. Assessment by transesophageal echocardiography.

Nonbacterial thrombotic endocarditis (NBTE) is difficult to detect antemortem and is often not suspected until embolic events occur. Transthoracic echocardiography is useful in diagnosing NBTE, but it may be limited by suboptimal imaging and resolution. Herein we describe the first reported case of NBTE diagnosed by transesophageal echocardiography. As early detection and treatment may avert significant embolic complications, transesophageal echocardiography should be strongly considered if other techniques are nondiagnostic and clinical suspicion of NBTE remains high.

Echocardiography↗
PubMed1992

Transesophageal echocardiography.

The Council on Scientific Affairs of the California Medical Association presents the following inventory of items of progress in anesthesiology. Each item, in the judgment of a panel of knowledgeable physicians, has recently become reasonably firmly established, both as to scientific fact and important clinical significance. The items are presented in simple epitome, and an authoritative reference, both to the item itself and to the subject as a whole, is generally given for those who may be unfamiliar with a particular item. The purpose is to assist busy practitioners, students, researchers, and scholars to stay abreast of these items of progress in anesthesiology, that have recently achieved a substantial degree of authoritative acceptance, whether in their own field of special interest or another. The items of progress listed below were selected by the Advisory Panel to the Section on Anesthesiology of the California Medical Association, and the summaries were prepared under its direction.

Echocardiography↗
PubMed1991

Hypertrophic cardiomyopathy: prognosis with medical or surgical therapy.

Over the past 30 years, knowledge of the natural history and effects of therapy in patients with hypertrophic cardiomyopathy has expanded greatly, but progress has been hampered by its variable patterns of expression. Many but not all patients show symptomatic improvement with medical treatment. Chronic beta blockage does not appear to affect long-term survival, whereas results with calcium channel blockade by verapamil have been encouraging; however, they await confirmation, and verapamil may be hazardous in some patients with severe left ventricular (LV) outflow tract obstruction and elevated LV end-diastolic pressure. Reported beneficial effects of amiodarone on survival also require further study. Surgical therapy has become the treatment of choice for medically refractory patients with proven outflow tract obstruction. In several centers, the operative risk is low, and long-term follow-up demonstrates prolonged symptomatic relief. It is hoped that work currently underway will provide more definitive information on the long-term effects of the role of calcium channel blockers, antiarrhythmic medications, and the long-term effects of surgical therapy on survival of patients with this disorder.

Adrenergic beta-Antagonists↗
PubMed1991

Reversibility of cardiac abnormalities in human immunodeficiency virus (HIV)-infected individuals: a serial echocardiographic study.

Seventy adults who tested positive for human immunodeficiency virus (HIV) were prospectively studied with serial echocardiography to better define the prevalence and progression of cardiac disease in such patients. Fifty outpatients (Group A), including 44 with acquired immunodeficiency syndrome (AIDS) and 6 with AIDS-related complex, and 20 additional patients (Group B) with asymptomatic HIV infection had baseline echocardiographic studies at a time when no patient had symptomatic heart disease. Follow-up studies were performed at 9 +/- 3 months in 52 patients (74%) and again at 15 +/- 3 months after baseline studies in 29 patients (41%). During the study, 22 patients (44%) in Group A and 1 patient (5%) in Group B died. Cardiac abnormalities were noted in 26 patients (52%) in Group A and 8 patients (40%) in Group B (p = NS) on initial or follow-up study. An abnormal left ventricular ejection fraction (less than 45%) or fractional shortening (less than 28%) was seen in seven patients in Group A; of these, three had normal left ventricular function on a later echocardiogram. One patient in Group B had persistent left ventricular dysfunction. All patients in Group A with left ventricular dysfunction on two serial studies died within 1 year after the initial echocardiogram. Ejection fraction did not change between baseline and two follow-up studies in either group (A: 52 +/- 9 vs. 56 +/- 9 vs. 55 +/- 5%, p = NS; B: 58 +/- 6 vs. 58 +/- 5 vs. 59 +/- 6%, p = NS). Right-sided cardiac enlargement resolved in 18 patients (44%), including 5 of 10 in Group A and 3 of 8 in Group B.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗