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Biomedical subjects

M L Robinson

Publications and source records attributed to M L Robinson.

At least 19 recordsLinked to original sources
PubMed1992

Duplex sonography of the carotid arteries.

Duplex sonography is the best noninvasive modality for investigation of possible carotid artery stenosis. By using the above described techniques, almost all significant stenoses can be detected and categorized correctly. Knowledge of common pitfalls in the performance and interpretation of the examination is essential to avoid misdiagnosis. Color imaging is a helpful addition to conventional duplex imaging, but is not essential to the performance of high-quality examinations.

Carotid Arteries↗
PubMed1992

Peripheral arterial Doppler ultrasonography: diagnostic criteria.

Fifty-one patients (86 legs) were studied from the aorta to the popliteal artery with both duplex ultrasonography and arteriography with the intention of establishing diagnostic ultrasonographic criteria for degrees of stenosis greater than 50% and determining the effect of multi-segment disease on the accuracy of these criteria. Receiver operator characteristic curves were used to determine diagnostic criteria for greater than 50%, greater than 70%, greater than 90% diameter stenoses or occlusions. A stenosis of greater than 70% was diagnosed either if the peak systolic velocity was more than 160 cm/sec (sensitivity 77%, specificity 90%) of if there was an increase in peak systolic velocity of 100% with respect to the arterial segment above the stenosis (sensitivity 80%, specificity 93%). Sequential stenoses were detected with lesser sensitivities. Ratio criteria were more accurate than peak systolic velocity for all degrees of stenosis. For detection of occlusion, duplex ultrasonography was 92% sensitive and 99% specific.

Arterial Occlusive Diseases↗
PubMed1992

Acute limb ischemia.

Acute ischemia of the extremity may be due to arterial occlusion from spontaneous thrombosis, embolus, arterial bypass graft thrombosis, trauma, or spasm. The presence of occlusion or stenosis can be determined noninvasively with the use of duplex Doppler ultrasonography. Most patients will require arteriography prior to thrombolytic or surgical therapy. New techniques, such as percutaneous aspiration thrombolectomy, expand the role of radiologic percutaneous therapy of the acutely ischemic limb. Prompt diagnosis and therapy are required to avoid limb loss or systemic metabolic complications from reperfusion of a dying limb.

Angioplasty, Balloon↗
PubMed1990

Evaluation of the peripheral arteries with duplex US after angioplasty.

Duplex ultrasound (US) was performed in 22 patients before and immediately after percutaneous transluminal balloon angioplasty (PTA) for peripheral artery stenoses or occlusions. Two patients underwent PTA on two occasions, and one patient underwent PTA of each lower extremity, resulting in 25 duplex US imaging pairs at a total of 40 PTA sites. The criterion for significant stenosis on duplex US studies was an increase in peak systolic velocity of at least 100% compared with the velocity in the arterial segment proximal to the lesion (velocity ratio, greater than or equal to 2.0). For 22 paired duplex US studies, pulse volume recordings or ankle-brachial indexes were obtained before and after PTA. After PTA, eight patients had residual high velocity ratios at 12 PTA sites. Only two of these patients had a residual hemodynamic stenosis as determined with post-PTA arteriography, pulse volume recordings, or ankle-brachial indexes. In this study, duplex US that was performed immediately after PTA for evaluation of residual stenosis was frequently misleading.

Angiography↗
PubMed1989

Report calls for fundamental health care reform.

The Joint Economic Committee in early October issued a report advocating reform of the financing and delivery of health care. Although this committee does not have authority over federal or state health programs, release of the committee's report adds impetus to calls for basic reforms.

Data Collection↗
PubMed1989

Turf battles rock radiology.

CEOs tell Hospitals magazine that imaging is a major area of expansion for their hospitals. But radiology is in a state of transition. Technological advances have made it possible to do more radiological procedures in the physician's office. This situation has created competition--and tension--between physicians in the same community, physicians and hospitals, and physicians on the same medical staff. How can you avoid costly turf wars at your hospital? Health care executives and directors of medical affairs say that the answer to this realignment of specialties is to create integrated teams of medical specialists.

Data Collection↗