ISSN:0275-1429    

出版商:OVID    

年代:1984

数据来源: OVID

摘要:

&NA;Prior studies of diagnostic exercise testing have used a wide selection of exercise electrocardiographic (ECG) lead systems and parameters for interpreting test results. Comparisons of current exercise ECG lead systems reveal differences in the sensitivity and specificity, depending on the different numbers and placement of leads. The present article reviews the results obtained from specific lead systems and provides a framework for the optimal lead system to maximize test results for routine diagnostic exercise testing. Analysis of newer parameters from exercise testing, such as deviations in the amplitude of the R wave, Q wave, and U wave and changes in the QX/QT and Q‐Tc intervals, are examined.

ISSN:0275-1429    

出版商:OVID    

年代:1984

数据来源: OVID

ISSN:0275-1429    

出版商:OVID    

年代:1984

数据来源: OVID

摘要:

&NA;More and more tests are being added to clinical practice, and the interpretation of these tests is becoming increasingly complicated. Multiple, even discordant, test results can be better interpreted using more sophisticated statistical methods that allow the physician to evaluate the cumulative effect of all available data. For example, a microcomputer program called CADENZA, which uses Bayes' theorem, was developed to aid in the diagnosis and prognosis of coronary artery disease. Our experience with this program correlates well with the prediction of angiographic disease prevalence, the discrimination of multivessel disease from single‐vessel disease, the incidence of coronary events (death and nonfatal infarction) in the year following testing, and the results of multivariate discriminant analysis.

ISSN:0275-1429    

出版商:OVID    

年代:1984

数据来源: OVID

摘要:

&NA;The recognition of coronary artery disease (CAD) in the asymptomatic, presumably healthy population is an ongoing medical problem. In an attempt to prevent untoward cardiovascular events in individuals who are at a relatively high risk for developing CAD and to modify changeable risks, the United States Army initiated a cardiovascular screening program for all active duty Army personnel over the age of 40 years. Criteria for primary cardiovascular screen failure include any one of the following abnormalities: (1) Framingham risk index ≥ 5%, (2) abnormal cardiovascular history or examination, (3) abnormal electrocardiogram, and (4) fasting blood sugar ≥ 115 mg/dl. Failure of the primary screen requires the taking of a secondary screening test, which includes an internal medicine or cardiology consultation and a maximum symptom‐limited exercise treadmill test and/or further sequential follow‐up. During the follow‐up, recommendations are made for risk factor modification and exercise programs. Between June 1981 and August 1983, 42,752 individuals have been screened. Of these, 23,428 (55%) have cleared the primary screen, 7,279 (17%) have cleared the secondary screen, and 1,040 (2.4%) have not passed the secondary screen.

ISSN:0275-1429    

出版商:OVID    

年代:1984

数据来源: OVID

ISSN:0275-1429    

出版商:OVID    

年代:1984

数据来源: OVID

摘要:

&NA;Oxygen uptake (V˙O2) during submaximal and maximal graded exercise testing (GXT) was measured in 25 patients at two, eight, and 24 weeks after coronary artery bypass graft surgery and in 12 healthy volunteers to determine whether V˙O2 submaxand V˙O2 maxcould be validly predicted from treadmill performance. Submaximal V˙O2was estimated from published equations by assuming that steady‐state V˙O2would be attained by the end of each submaximal stage and that V˙O2would increase linearly within each stage. Maximal V˙O2was estimated from several published equations relating V˙O2 maxto treadmill performance using the Bruce treadmill protocol. The results indicated that V˙O2 submaxdid not differ significantly from predicted values during the clearly submaximal portions of the test (>3 min from test termination). However, there was a clear plateauing of V˙O2as maximal exertion was approached even in patients eight weeks postoperatively. Maximal V˙O2was generally well correlated (r ˜ .84) with treadmill performance. However, use of equations developed for normal subjects to predict V˙O2 maxin cardiac patients resulted in consistent overprediction of V˙O2 max. It is concluded that accurate estimation of V˙O2 maxis critically dependent on choosing the appropriate population‐specific equation.

ISSN:0275-1429    

出版商:OVID    

年代:1984

数据来源: OVID

ISSN:0275-1429    

出版商:OVID    

年代:1984

数据来源: OVID