Archive for the 'Myocardial Perfusion' Category

13 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: Conclusion

The extent of rest MIBI perfusion defects in 274 patients with acute MI was assessed quantitatively both at hospital presentation and shortly before discharge. A total of 237 patients (86%) underwent “reperfusion” therapy (thrombolysis, coronary angioplasty, and/or coronary artery bypass grafting). Two-year mortality was 7% when the predischarge study MIBI perfusion defect was > 12% of […]

12 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: Emergency Department Assessment of Chest Pain

These same investigators followed up 112 hospitalized patients who underwent resting MIBI tomography after presenting with chest pain and had no in-hospital adverse cardiac event. No subsequent cardiac events occurred within 90 days of testing in 87 patients with normal MIBI studies. Conversely, 2 of 25 patients with an abnormal MIBI study (8%; p = […]

11 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: Adenosine testing

Adenosine testing with dual-isotope tomography was used to assess risk of perioperative unstable angina, MI, and cardiac death in 43 patients undergoing major noncardiac surgery (vascular procedures in 26, nonvascular in 17). Perioperative cardiac events occurred in 4 of 15 patients with reversible defects and none of the 28 without a reversible defect (p = […]

10 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: Preoperative Cardiac Risk Stratification

Several studies have assessed the perioperative and long-term prognostic value of dipyridamole MIBI imaging in vascular surgery patients. A retrospective analysis of 31 patients failed to show that a reversible MIBI defect was able to predict perioperative risk. In another study, Stratmann et al evaluated 197 patients undergoing a vascular procedure < 3 months after dipyridamole […]

09 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: Risk Stratification After Acute MI

However, a later study did not confirm the prognostic value of an exercise-induced reversible MIBI defect following acute MI. Nonfatal MI (n = 15) or cardiac death (n = 15) occurred in 30 of 133 male patients (23%) with acute MI who underwent sub-maximal exercise MIBI tomography prior to hospital discharge and were followed up […]

07 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: MIBI tomography

This same group also reported their experience with a similar series of 126 men with unstable angina who underwent prehospital discharge exercise testing with MIBI SPECT. Over a mean follow-up period of 12 ± 7 months, 2% of patients with normal MIBI studies had nonfatal MI or cardiac death, compared with 14% of those with […]

06 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: Evaluation of Patients With Unstable Angina

Patients presenting with unstable angina can be stratified into low-, intermediate-, and high-risk groups based on clinical and ECG criteria. Low-risk and many intermediate-risk patients whose conditions can be stabilized with medical therapy can be further evaluated using stress testing to determine whether coronary angiography is indicated order birth control online. At present, few investigators […]

05 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: Testing With MIBI in Patients in Stable Condition

These investigators also found that left ventricular cavity dilation with dipyridamole MIBI testing was associated with increased risk. Transient left ventricular dilation was seen in 70 (14%) and fixed cavity dilation in 74 (14%) of their 512 patients. Cardiac death or nonfatal MI occurred in 1.9% of patients with normal left ventricular size, compared with […]

04 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: Prognostic Value of Pharmacologic

EBCT can be used to diagnose significant CAD by assessing the presence of and quantitating calcification in coronary arteries. Exercise EBCT can also be performed, with injection of nonionic contrast material at peak exercise. Changes in global ejection fraction and development of new left ventricular wall motion abnormalities indicating development of myocardial ischemia can be […]

03 Sep

Technetium Tc 99m Sestamibi Myocardial Perfusion Imaging: Stable angina

The prognostic value of exercise or pharmacologic MIBI SPECT was compared in 864 white and 222 African-American patients with stable angina pecto-ris. The latter had a greater incidence of cardiac events (2.3% vs 1.0%; not significant [NS]) and all-cause mortality (11.6% vs 4.2%; p < 0.05) than whites. Normal MIBI studies were seen in 36% of […]

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