PubMed Health⌕ Search

Biomedical subjects

Randolph P Martin

Publications and source records attributed to Randolph P Martin.

9 recordsLinked to original sources
PubMed2006

Intracoronary stent visualized on transesophageal echocardiogram in a case of coronary dissection complicated by aortic dissection.

We present a case of a patient presenting with a myocardial infarction with subsequent coronary intervention resulting in a coronary dissection complicated by an aortic dissection. The coronary dissection was treated with coronary stents. Transesophageal echocardiogram visualized the intracoronary stent within the intimal flap of the aortic dissection. The aortic dissection was successfully managed conservatively.

Aortic Dissection↗
PubMed2006

The use of echocardiography for the evaluation of dyssynchrony.

Tissue Doppler imaging (TDI), is a new imaging tool that allows measurement of dyssynchrony. In several small studies, TDI predicted clinical response and reverse remodeling after cardiac resynchronization therapy (CRT). Moreover, it allowed detection of mechanical dyssynchrony in heart failure patients with narrow QRS. Using TDI, the selection criteria for CRT might be changed to include heart failure patients with narrow QRS. Furthermore, it will help predict responders to this therapy, hence decreasing the percentage of nonresponders and allowing a more cost-effective use of this new technology.

Arrhythmias, Cardiac↗
PubMed2005

Coronary artery vasospasm during dobutamine stress echocardiography.

Compared with the frequent occurrence of S-T segment depression, the development of S-T segment elevation during dobutamine stress echocardiography is a relatively rare finding, especially in the setting of nonobstructive coronary artery disease. We present two patients who developed chest discomfort with S-T segment elevation during dobutamine stress testing. Both patients had unremarkable baseline echocardiograms and no history suggestive of coronary vasospasm. Subsequent coronary angiography revealed nonobstructive disease. It is speculated that the likely presence of endothelial dysfunction coupled with mild coronary atherosclerosis caused an imbalance between the coronary vasodilatory and vasoconstrictive forces. The inhibition of the vasodilatory effects of beta-adrenergic receptor stimulation and flow-mediated dilation of dobutamine was overcome by the vasoconstrictive effects of dobutamine-stimulated alpha-1 receptor activation; thus, contributing to the development of coronary vasospasm. This condition is important to recognize and appreciate as the initial treatment for this condition favors the use of nitrates over beta-blockade.

Adult↗
PubMed2004

Usefulness of the peak velocity difference by tissue Doppler imaging technique as an effective predictor of response to cardiac resynchronization therapy.

Cardiac resynchronization therapy (CRT) improves symptoms and functional status in heart failure patients; however, current selection criteria need improvement. A novel tissue Doppler imaging parameter, the peak velocity difference (PVD), defined as the greatest difference in time to peak velocity between any of 6 left ventricular regions, may better select responders to CRT. Subjects were divided into 2 groups based on the PVD. Clinical and echocardiographic parameters significantly improved in subjects with dyssynchrony by the baseline PVD and had a better overall response to CRT.

Aged↗
PubMed2004

Contrast for vascular imaging.

This article discusses the use of standard contrast agents that, when coupled with high-resolution carotid ultrasound, offers the dramatic potential to improve measurement of intimal medial thickness, better defining luminal endothelial surface, improving the determination of plaque ulceration, and offering the dramatic capabilities to visualize directly neovasculature growth of the vasa vasorum. The technique may identify vulnerable plaques and may also show their alterations with therapeutic pharmacologic interventions. In the coronary circulation, use of contrast significantly enhances the ability to image the epicardial coronary arteries to obtain data on coronary flow reserve for the diagnosis of coronary artery disease.

Arteriosclerosis↗
PubMed2004

Timing of aortic valve surgery in chronic aortic stenosis and regurgitation.

The correct timing of aortic valve replacement in chronic aortic stenosis or regurgitation is a very important and sometimes difficult task for physicians caring for patients with aortic valve disease. In this review, we will present the current available literature regarding the appropriate management of these patients.

Aortic Valve↗
PubMed2002

Intraoperative echocardiography and minimally invasive cardiac surgery.

The term minimally invasive cardiac surgery encompasses a number of different techniques, each with its own rationale, origin, and development, but all focusing on limiting the physiologic trespass of cardiac surgery on the patient. In this article, we discuss the application of intraoperative echocardiography to three types of these procedures: Offpump coronary artery bypass graft (OPCABG) surgery, valvular surgery through limited thoracic incisions, and port-access heart surgery.

Adult↗