Septal Q wave in exercise testing: Angiographic correlation

Morales-Ballejo, Hugo; Greenberg, Paul S.; Ellestad, Myrvin H.; Bible, Monte

doi:10.1016/0002-9149(81)90603-2

Cited by 43 publications

(4 citation statements)

References 16 publications

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“…Most patients demonstrated an increase in Q wave amplitude at peak exercise, as shown in previous studies (23,24). However, among 8 patients with ST-segment downsloping in lead V 5 , three demonstrated a diminished Q wave in lead V 5 at peak exercise.…”

Section: Discussionsupporting

confidence: 82%

Treadmill exercise testing of asymptomatic men and women without evidence of heart disease

Chalela¹,

Fukushima²,

Araújo³

et al. 2009

Braz J Med Biol Res

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The aim of this study was to test the hypothesis of differences in performance including differences in ST-T wave changes between healthy men and women submitted to an exercise stress test. Two hundred (45.4%) men and 241 (54.6%) women (mean age: 38.7 ± 11.0 years) were submitted to an exercise stress test. Physiologic and electrocardiographic variables were compared by the Student t-test and the chi-square test. To test the hypothesis of differences in ST-segment changes, data were ranked with functional models based on weighted least squares. To evaluate the influence of gender and age on the diagnosis of ST-segment abnormality, a logistic model was adjusted; P < 0.05 was considered to be significant. Rate-pressure product, duration of exercise and estimated functional capacity were higher in men (P < 0.05). Sixteen (6.7%) women and 9 (4.5%) men demonstrated ST-segment upslope ≥0.15 mV or downslope ≥0.10 mV; the difference was not statistically significant. Age increase of one year added 4% to the chance of upsloping of segment ST ≥0.15 mV or downsloping of segment ST ≥0.1 mV (P = 0.03; risk ratio = 1.040, 95% confidence interval (CI) = 1.002-1.080). Heart rate recovery was higher in women (P < 0.05). The chance of women showing an increase of systolic blood pressure ≤30 mmHg was 85% higher (P = 0.01; risk ratio = 1.85, 95%CI = 1.1-3.05). No significant difference in the frequency of ST-T wave changes was observed between men and women. Other differences may be related to different physical conditioning

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Section: Discussionsupporting

confidence: 82%

Treadmill exercise testing of asymptomatic men and women without evidence of heart disease

Chalela¹,

Fukushima²,

Araújo³

et al. 2009

Braz J Med Biol Res

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“…84 QRS duration in normal subjects generally decreases at higher exercise workloads. 85 Septal Q waves measured in lateral leads tend to increase in magnitude during exercise in normal subjects, 86,87 whereas R waves decrease and S waves tend to increase in inferior leads. 88 These separate findings can be incorporated into a QRS score for diagnostic purposes.…”

Section: Qrs Complexmentioning

confidence: 99%

Exercise Standards for Testing and Training

Fletcher¹,

Ades²,

Kligfield³

et al. 2013

Circulation

1,685

760

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“…8 The relatively low sensitivity and specificity of the standard exercise testing ischemic marker (STsegment deviation), led to studies that examined the alterations of the amplitudes of Q, R and S deflections during exercise testing-the relations of these changes to myocardial ischemia were addressed as well. 9,10 On the contrary, other investigators challenge the credibility of these findings. 11,12 However, a QRS index was proposed, 13 which is calculated based on Q, R, and S changes in leads aVR and V5 during exercise testing, and is independent of ST-segment changes.…”

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confidence: 99%