Exercise-induced myocardial ischaemia detected by cardiopulmonary exercise testing.
BACKGROUND
The objective of the study was to identify the parameter(s) of cardiopulmonary exercise testing (CPET) that can detect exercise-induced myocardial ischaemia (EIMI), and to determine its diagnostic accuracy for identifying patients with coronary artery disease (CAD).


RESULTS
We prospectively studied 202 consecutive patients (173 men, 29 women, mean age 55.7+/-10.8 years) with documented CAD. All patients underwent an incremental exercise stress testing (ECG-St) with breath-by-breath gas exchange analysis, followed by a 2-day stress/rest gated SPECT myocardial scintigraphy (GSMS) as the gold standard for ischaemia detection. ROC analysis selected a two-variable model-O(2)pulse flattening duration, calculated from the onset of myocardial ischaemia to peak exercise, and deltaVO(2)/deltawork rate slope-to predict EIMI by CPET. GSMS identified 140 patients with reversible myocardial defects, with a Summed Difference Score (SDS) of 9.7+/-2.8, and excluded EIMI in 62 (SDS 1.3+/-1.6). ECG-St had low sensitivity (46%) and specificity (66%) to diagnose EIMI as compared with CPET (87% and 74%, respectively).


CONCLUSIONS
The addition of gas exchange analysis improves the diagnostic accuracy of standard ECG stress testing in identifying EIMI. A two-variable model based on O(2)pulse flattening duration and deltaVO(2)/deltawork rate slope had the highest predictive ability to identify EIMI.
Belardinelli
Romualdo
R
Lancisi Heart Institute, Department of Cardiology and Cardiac Surgery, Ancona, Italy. r.belardinelli@fastnet.it
Lacalaprice
Francesca
F
Carle
Flavia
F
Minnucci
Adelaide
A
Cianci
Giovanni
G
Perna
GianPiero
G
D'Eusanio
Giuseppe
G
D000704:Analysis of Variance; D004562:Electrocardiography; D015444:Exercise; D005080:Exercise Test; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology; D015588:Observer Variation; D010101:Oxygen Consumption; D011446:Prospective Studies; D015899:Tomography, Emission-Computed, Single-Photon