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Biomedical subjects

B R Fang

Publications and source records attributed to B R Fang.

28 records · Page 2Linked to original sources
PubMed1988

Doppler and two-dimensional echocardiographic features of sinus of Valsalva aneurysm.

Doppler, contrast, and two-dimensional echocardiograms of 12 aneurysms of the sinus of Valsalva in 10 consecutive patients were analyzed in order to highlight the diagnostic features. The diagnosis were confirmed by surgical and/or catheterization findings. The aneurysms had ruptured in 7 of 12 (58%). Two-dimensional echocardiography prior to the contrast studies was able to delineate the aneurysms in 7 of 12 (58%). The contrast studies outlined two additional aneurysms. The right aneurysms directed anteriorly and caudally. The noncoronary aneurysms formed an extraneous lumen at the posterior part of the aortic root, mimicking aortic dissection. Doppler examinations showed systolic and diastolic turbulence in five of six (83%) of the right aneurysms rupturing into the right ventricular outflow tract. Color Doppler echocardiography showed a left ventricular diastolic turbulence emanating from the aneurysm in a case with a noncoronary aneurysm rupturing into the left ventricle. It is concluded that the principal Doppler, contrast, and two-dimensional echocardiographic features usually allow a rapid correct diagnosis of sinus of Valsalva aneurysm.

Adult↗
PubMed1987

Diagnostic accuracy of two-dimensional echocardiography for detection of left atrial thrombus in patients with mitral stenosis.

Two-dimensional echocardiograms of 56 patients with mitral stenosis, who subsequently underwent operation, were analyzed to evaluate the accuracy for the detection of left atrial thrombi. From left parasternal, apical, and subcostal cardiac windows, multiple planes (including standard planes and their derived scanning planes) were assessed for the presence or absence of mass echoes in the left atrium. The results showed 63% sensitivity, 95% specificity, 87% positive predictive value, 84% negative predictive value, and 83% overall diagnostic accuracy. Most of the false-negative cases had their thrombi confined to the left atrial appendage. We conclude that in patients with mitral stenosis, two-dimensional echocardiography is promising for the diagnosis of left atrial thrombi, particularly when they locate or extend to the main left atrial cavity (not confined to atrial appendage).

Adult↗
PubMed1986

Importance of adequate gas-mixing in contrast echocardiography.

Microbubble formation has been accepted as the mechanism producing contrast echoes. Comparisons of the contrast effects of various agents have been studied extensively, but the importance of gas-mixing has been less appreciated. To test the hypothesis that good gas-mixing, by facilitating microbubble formation, would enhance contrast effect, this study compared the contrast echocardiograms of ten adult patients before and after mixing carbon dioxide with various contrast agents. Contrast agents tested included a 5 percent glucose in water, vitamin B complex, vitamin C, and Cardiogreen solutions. First, we recorded echocardiograms by injecting each diluted contrast solution alone, then repeated the examinations using 10 ml of each diluted solution with 1 ml of carbon dioxide (CO2), mixed by means of a four-way stopcock. Satisfactory or excellent results were obtained in seven of ten, ten of ten, ten of ten, and ten of ten tests, respectively, after thorough gas-mixing, vs one of ten, seven of ten, eight of ten, and six of ten, respectively, before gas-mixing. We conclude that the addition of sufficient amounts of gas, followed by thorough mixing, is of great importance in contrast echocardiography. Consistently good results can be achieved with vitamin C, vitamin B or Cardiogreen solutions by this simple and safe method.

Adolescent↗
PubMedDate not supplied

Echocardiographic detection of reversible right ventricular strain in patients with acute pulmonary embolism: report of 2 cases.

This report presents serial echocardiographic changes recorded before and after anticoagulant therapy was administered to 2 patients with acute pulmonary embolism. Dilatation of the right ventricle, abnormal motion of the interventricular septum and mild tricuspid regurgitation were noted in both patients. The results of the echocardiogram suggested that the patients had right ventricular pressure overload resulting from pulmonary hypertension caused by an acute pulmonary embolism. Echocardiograms performed after the patients had received anticoagulant therapy revealed a normalization of the echocardiographic parameters in both patients. The reversal of the right ventricular strain pattern revealed by an echocardiogram occurred as the result of the regression of pulmonary hypertension after anticoagulant therapy. In conclusion, echocardiographic detection of right ventricular strain in patients who present acute cardiopulmonary manifestations with no previous history of severe pulmonary disease may indicate the possibility of a pulmonary embolism.

Acute Disease↗
PubMedDate not supplied

Postoperative echocardiographic study of patients with symptomatic chronic aortic regurgitation.

Aortic valve replacement was performed in 31 patients with symptomatic chronic aortic regurgitation. The patients ranged in age from 13 to 66 (mean = 39) years and included 29 men and 2 women. They were followed up for a mean of 47 months. Perioperatively, 2 patients (6.5%) died, and 2 (6.5%) received a permanent pacemaker for complete heart block. Thirty patients received an M-mode echocardiographic examination both before, and 6 to 11 days after, the operation. In this early postoperative period, the end-diastolic dimension (EDD) and left ventricular end-diastolic radius/posterior wall thickness ratio (R/Th) decreased in all patients. This decrease in EDD could be predicted by preoperative ejection fraction (EF), but not by end-systolic dimension (ESD) or R/Th ratio. The ESD regressed only in patients with preoperative EF greater than 50%, or ESD less than 55mm, or R/Th less than 3.8. During the long-term follow-up, one each had mild tissue valve degeneration, stroke, infective endocarditis, and severe myocardial failure, but none died. Eighteen patients had repeated M-mode echocardiographic studies. There was no further regression of EDD and R/Th, while ESD showed significant decrease. The EF and fractional shortening (FS) did not change. Clinically, the patients who survived the operation improved or remained unchanged postoperatively in a functional status. However, those who had preoperative EF greater than 50% or ESD less than 55mm had a better postoperative functional class (1.2 +/- 0.4 vs 1.9 +/- 1.0, p less than 0.05, 1.2 +/- 0.4 vs 2.0 +/- 1.1, p less than 0.05, respectively). Thus, patients with symptomatic chronic aortic regurgitation can often benefit from valve replacement.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗