Diego Perez - Academia.edu (original) (raw)
Papers by Diego Perez
We study crises characterized by large adjustments of aggregate consumption through their microle... more We study crises characterized by large adjustments of aggregate consumption through their microlevel patterns. We show that leading theories designed to explain aggregate consumption dynamics differ markedly in their cross-sectional predictions. While theories based on financial frictions predict that rich households with liquid assets should be able to smooth consumption during bad times, neoclassical theories predict that these agents would optimally adjust their consumption if crises severely affect their permanent income. Using microlevel data on several episodes of large aggregate-consumption adjustment, we document that rich households significantly adjust consumption relative to their income, consistent with the permanent-income hypothesis of consumption during crises. We discuss our findings' implications for the effectiveness of stabilization policies that target consumption during crises. Rafael Guntin New York University rg3128@nyu.edu Pablo Ottonello Department of Ec...
Journal of the American Society of Echocardiography, 2007
Background: Although 3-dimensional echocardiography (3DE) has been applied during dobutamine echo... more Background: Although 3-dimensional echocardiography (3DE) has been applied during dobutamine echocardiography it has not been used during exercise echocardiography. We sought to compare feasibility and accuracy of 3DE and 2-dimensional echocardiography (2DE) during exercise echocardiography. Methods: 100 patients underwent peak and postexercise (PEx) 2DE and 3DE on separate days. Coronary artery disease was detected in 58 patients. A quality score was calculated by assigning 0 to 3 points to each wall (apicoseptal, posterolateral, anterior, inferior). Results: Feasibility of peak 2DE, peak 3DE, PEx 2DE, and PEx 3DE was 99%, 92%, 100%, and 95%, respectively (2DE at peak or PEx vs peak 3DE, P < .05). Agreement between 2DE and 3DE was 82% at peak (؍ 0.62) and 78% at PEx (؍ 0.55). Quality score less than 2 was seen in 4% of the walls with peak 2DE, in none with PEx 2DE, in 18% by peak 3DE, and in 14% by PEx 3DE. The mean quality score was lower with 3DE at peak and at PEx (2.4 ؎ 0.9 vs 2.9 ؎ 0.3; and 2.5 ؎ 0.8 vs 3.0 ؎ 0.1, both P < .0001). Acquisition time was shorter with 3DE at peak and PEx (22 ؎ 8 vs 43 ؎ 14 seconds; and 15 ؎ 5 vs 31 ؎ 14 seconds, both P < .0001). Sensitivity of peak 2DE, peak 3DE, PEx 2DE, and PEx 3DE was 84%, 78%, 71%, and 58%, respectively (P < .05 vs peak 3DE and peak 2DE). Specificity was 76%, 73%, 93%, and 88%, respectively. Accuracy for peak 2DE was 81% (area under the curve [AUC] 0.81, 95% confidence interval [CI] ؍ 0.71-0.91); for peak 3DE was 76% (AUC 0.76, 95% CI ؍ 0.65-0.86); for PEx 2DE was 80% (AUC 0.84, 95% CI ؍ 0.75-0.92); and for PEx 3DE was 71% (AUC 0.73, 95% CI ؍ 0.62-0.83). Conclusions: Three-dimensional echocardiography during exercise is comparable with 2DE in terms of sensitivity and specificity but feasibility is lower.
We study crises characterized by large adjustments of aggregate consumption through their microle... more We study crises characterized by large adjustments of aggregate consumption through their microlevel patterns. We show that leading theories designed to explain aggregate consumption dynamics differ markedly in their cross-sectional predictions. While theories based on financial frictions predict that rich households with liquid assets should be able to smooth consumption during bad times, neoclassical theories predict that these agents would optimally adjust their consumption if crises severely affect their permanent income. Using microlevel data on several episodes of large aggregate-consumption adjustment, we document that rich households significantly adjust consumption relative to their income, consistent with the permanent-income hypothesis of consumption during crises. We discuss our findings' implications for the effectiveness of stabilization policies that target consumption during crises. Rafael Guntin New York University rg3128@nyu.edu Pablo Ottonello Department of Ec...
Journal of the American Society of Echocardiography, 2007
Background: Although 3-dimensional echocardiography (3DE) has been applied during dobutamine echo... more Background: Although 3-dimensional echocardiography (3DE) has been applied during dobutamine echocardiography it has not been used during exercise echocardiography. We sought to compare feasibility and accuracy of 3DE and 2-dimensional echocardiography (2DE) during exercise echocardiography. Methods: 100 patients underwent peak and postexercise (PEx) 2DE and 3DE on separate days. Coronary artery disease was detected in 58 patients. A quality score was calculated by assigning 0 to 3 points to each wall (apicoseptal, posterolateral, anterior, inferior). Results: Feasibility of peak 2DE, peak 3DE, PEx 2DE, and PEx 3DE was 99%, 92%, 100%, and 95%, respectively (2DE at peak or PEx vs peak 3DE, P < .05). Agreement between 2DE and 3DE was 82% at peak (؍ 0.62) and 78% at PEx (؍ 0.55). Quality score less than 2 was seen in 4% of the walls with peak 2DE, in none with PEx 2DE, in 18% by peak 3DE, and in 14% by PEx 3DE. The mean quality score was lower with 3DE at peak and at PEx (2.4 ؎ 0.9 vs 2.9 ؎ 0.3; and 2.5 ؎ 0.8 vs 3.0 ؎ 0.1, both P < .0001). Acquisition time was shorter with 3DE at peak and PEx (22 ؎ 8 vs 43 ؎ 14 seconds; and 15 ؎ 5 vs 31 ؎ 14 seconds, both P < .0001). Sensitivity of peak 2DE, peak 3DE, PEx 2DE, and PEx 3DE was 84%, 78%, 71%, and 58%, respectively (P < .05 vs peak 3DE and peak 2DE). Specificity was 76%, 73%, 93%, and 88%, respectively. Accuracy for peak 2DE was 81% (area under the curve [AUC] 0.81, 95% confidence interval [CI] ؍ 0.71-0.91); for peak 3DE was 76% (AUC 0.76, 95% CI ؍ 0.65-0.86); for PEx 2DE was 80% (AUC 0.84, 95% CI ؍ 0.75-0.92); and for PEx 3DE was 71% (AUC 0.73, 95% CI ؍ 0.62-0.83). Conclusions: Three-dimensional echocardiography during exercise is comparable with 2DE in terms of sensitivity and specificity but feasibility is lower.