OBJECTIVES The purpose of this study is to evaluate the feasibility in detecting blood flow in the left anterior descending coronary artery (LAD) using transthoracic color Doppler (CD) imaging (in both second harmonic and fundamental mode) along with contrast enhancement and to verify if this new noninvasive method along with adenosine is safe, rapid and effective in assessing coronary flow res...

Principles of TDI Doppler echocardiography relies on detection of the shift in frequency of ultrasound signals reflected from moving objects. With this principle, conventional Doppler techniques assess the velocity of blood flow by measuring high-frequency, low-amplitude signals from small, fast-moving blood cells. In TDI, the same Doppler principles are used to quantify the higheramplitude, lo...

There are currently very few test objects suitable for high-frequency ultrasound scanners that can be rapidly manufactured, have appropriate acoustic characteristics and are suitably robust. Here we describe techniques for the creation of a wall-less flow phantom using a physically robust konjac and carrageenan-based tissue-mimicking material. Vessel dimensions equivalent to those of mouse and ...

We calculate the line shape and linewidths for electromagnetically induced transparency EIT in optically thick, Doppler broadened media buffer gasses are also considered . In generalizing the definition of the EIT linewidth to optically thick media, we find two different linewidth definitions apply depending on whether the experiment is pulsed or continuous wave cw . Using the cw definition for...

A 27-year-old man who was known to have hypereosinophilic syndrome (HES) underwent evaluation at our echocardiography laboratory for exertional dyspnea. Laboratory tests revealed leukocytosis (5.4  10/L) with marked eosinophilia (34.6%; normal range, 4%), in addition to an elevated level of tryptase (70 ng/mL; normal range, 13.5 ng/mL). Two-dimensional transthoracic echocardiography showed a...

We present the case of a 54-year-old patient with no history of heart disease who underwent transesophageal echocardiography (TEE) to rule out the presence of thrombus in the left atrial appendage (LAA) prior to programmed electrical cardioversion for common counterclockwise atrial flutter with 2:1 ventricular response at 150 bpm. The TEE confirmed good biventricular function, no thrombus in LA...

Twenty-four healthy subjects and 33 patients with left-sided valvular heart disease in atrial fibrillation were studied using a pulsed-wave Doppler ultrasound system connected to a 900 two-dimensional echocardiography device. Systolic turbulence in the right atrium (RAST) was studied, and the ratio of maximum systolic velocity to maximum diastolic velocity ratio (MSV:MDV) was determined in the ...

A 34-year-old gravida was diagnosed with hydrops fetalis, hydrothorax with cardiac compression, hygroma, ascites, and subcutaneous edema at 20 weeks of gestation. The peak systolic umbilical artery and middle cerebral artery velocities were 30 cm/sec and 28 cm/sec, respectively. The umbilical vein demonstrated a lowamplitude blunted waveform. The cerebral venous sinuses were imaged by color Dop...

Atrial fibrillation is the most common pathologic supraventricular tachycardia. It has many causes, is an expensive disease, impairs quality of life and leads to an increased risk of death. Atrial dissociation is characterised by the presence of two independent sets of P-waves. This peculiar abnormality may give rise to the scenario where one atrium is in atrial fibrillation while the other is ...