Successful Peritoneal Dialysis for the Treatment of Inotrope-Dependent End-Stage Heart Failure.

Extra- and/or intracorporeal renal replacement therapy can improve the cardiorenal hemodynamics in patients with advanced heart failure (HF) refractory to medical therapy and renal failure. Here, we report the case of a 51-year-old woman with inotrope-dependent end-stage HF and chronic renal failure due to anthracycline-induced cardiomyopathy, in whom the induction of hemodiafiltration and subsequent chronic peritoneal dialysis (PD) provided a dramatic improvement of her cardiac hemodynamics from restrictive to almost normal physiology assessed by echocardiography and cardiac catheterization. The patient returned to office work with New York Heart Association functional class I-II symptoms for at least 3 years with continuous ambulatory PD after hospital discharge.

Effect of Anemia on Cardiovascular Hemodynamics, Therapeutic Strategy and Clinical Outcomes in Patients With Heart Failure and Hemodynamic Congestion.

BACKGROUND: We investigated the effect of anemia on cardiovascular hemodynamics, therapeutic strategies and clinical outcomes in heart failure (HF) patients.Methods and Results:We divided 198 consecutive HF patients who underwent right heart catheterization before in-hospital HF treatment into 2 groups according to the presence or absence of hemodynamic congestion (HC: mean pulmonary capillary wedge pressure ≥15 mmHg and/or mean right atrial pressure ≥10 mmHg). The hemoglobin level correlated with the cardiac index (CI) and systemic vascular resistance index (SVRI) (r=-0.34 and 0.42, P<0.05, respectively), and was the strongest contributor of SVRI only in the HC group. Anemic patients more frequently required intravenous inotropic support despite having higher CI and lower SVRI than non-anemic patients in the HC group. The novel hemodynamic subsets based on mean right atrial pressure and estimated left ventricular stroke work index but not Forrester subsets appropriately predicted the need for intravenous inotropic support. The probability of hospitalization for worsening HF during 2-year follow-up period was significantly higher in anemic patients than in non-anemic patients in the HC group. CONCLUSIONS: Anemia had a direct effect on cardiovascular hemodynamics and thus can confound therapeutic planning in HF patients with HC. The novel hemodynamic subsets can be applied in daily clinical practice regardless of the presence or absence of anemia.

A Survival Case of Fulminant Right-Side Dominant Eosinophilic Myocarditis.

A 59-year-old Japanese woman was admitted to a nearby hospital with dyspnea and general malaise. Transthoracic echocardiography revealed right ventricular (RV) dilatation with severely reduced systolic function and leftward shift of the intraventricular septum. She was initially diagnosed with acute right heart failure, and fell into cardiogenic shock requiring an intra-aortic balloon pump and inotropic agents. An endomyocardial biopsy (EMB) demonstrated extensive interstitial edema, infiltration of inflammatory cells including numerous eosinophils, and myocytolysis with eosinophil degranulation. She was histologically diagnosed with eosinophilic myocarditis. Steroid pulse therapy was initiated, and her hemodynamic status improved along with dramatic recovery of the RV function. EMB 6 days after the initiation of steroid pulse therapy showed the disappearance of infiltration and degranulation of eosinophils, although lymphocytic infiltration still remained. Positron emission tomography-computed tomography (PET/CT) 23 days after steroid pulse therapy showed an increased 18F-FDG uptake in the intraventricular septum and left ventricle, suggesting persistent myocardial inflammation. She was then treated with a maintenance dose of prednisolone. She became free of symptoms and follow-up echocardiography showed normal cardiac function 3 months after the initiation of corticosteroid treatment. In addition, EMB and PET/CT showed no inflammation. This is the first case report of fulminant and right-sided dominant eosinophilic myocarditis successfully treated with corticosteroid.

Combination of Urinary Sodium/Creatinine Ratio and Plasma Brain Natriuretic Peptide Level Predicts Successful Tolvaptan Therapy in Patients With Heart Failure and Volume Overload.

To evaluate the short-term clinical and hemodynamic effects of tolvaptan therapy and to identify predictors of the therapeutic outcomes, we retrospectively recruited 60 consecutive hospitalized heart failure (HF) patients (70 ± 11 years) with volume overload. The subjects were divided into two groups on the basis of the changes in HF symptom scores and hemodynamic status assessed by right heart catheterization after tolvaptan therapy (median: 7 days). The majority of patients were successfully treated (group 1). However, 22% of patients (group 2) were unsuccessfully treated, in whom 1) the HF symptom score worsened or 2) there was a stationary HF symptom score ≥ 6 points, and mean PCWP > 18 mmHg and mean RAP > 10 mmHg, after tolvaptan therapy. HF symptom scores, hemodynamic parameters, and plasma brain natriuretic peptide (BNP) level improved in group 1, but all of these parameters remained unchanged in group 2. Lower urine sodium/creatinine ratio (UNa/UCr) and higher BNP level at baseline were independently associated with unsuccessful tolvaptan therapy, and UNa/UCr best predicts unsuccessful tolvaptan therapy with a cut-off value of 46.5 mEq/g·Cr (AUC 0.847, 95% CI: 0.718-0.976, sensitivity 77%, specificity 81%, P < 0.01). Double-positive results of UNa/UCr < 46.5 mEq/g·Cr and plasma BNP level > 778 pg/mL predicted unsuccessful tolvaptan therapy with high diagnostic accuracy (sensitivity 54%, specificity 100%, positive predictive value 100%, negative predictive value 89%, and accuracy 90%). In summary, short-term tolvaptan therapy ameliorated HF symptoms and provided hemodynamic improvement in the majority of patients, and UNa/UCr and BNP level strongly predicted the therapeutic outcomes.

Renal resistive index as an indicator of the presence and severity of anemia and its future development in patients with hypertension.

BACKGROUND: We examined whether renal resistive index (RI), a simple index of renal vascular resistance, is associated with the presence and severity of anemia, and can predict the future development of anemia in patients with hypertension. METHODS: We retrospectively examined 175 patients with hypertension (mean age 67 ± 11 years, 32-85 years, 134 males) who underwent renal ultrasonography. Anemia was defined as a reduction in the concentration of hemoglobin <13.0 g/dL for men and <12.0 g/dL for women. Renal RI was measured in the interlobar arteries. RESULTS: Anemia was present in 37% of men and 34% of women. The mean estimated glomerular filtration rate (eGFR) was 58 ± 23 ml/min/1.73 m(2) (median: 56 ml/min/1.73 m(2), range: 16-168 ml/min/1.73 m(2)) and the mean renal RI was 0.70 ± 0.09 (median: 0.70, range: 0.45-0.92). Proteinuria was present in 29% of patients. Both eGFR and renal RI correlated significantly with hemoglobin levels. In the stepwise multivariate linear regression analysis, renal RI was associated with hemoglobin levels independently of potential confounders including eGFR. During the follow-up period (median: 959 days, range: 7-3595 days), Kaplan-Meier curves demonstrated that patients with renal RI above the median value had a higher incidence of the future development of anemia than other patients. Cox regression analysis showed that renal RI (hazard ratio 1.18, 95% CI 1.02-1.37 per 0.05 rises in renal RI, p =0.03) and the presence of proteinuria were (hazard ratio 1.80, 95% CI 1.08-3.01, p =0.03) were independently associated with the future development of anemia after correcting for confounding factors. CONCLUSIONS: Measurement of renal RI can be useful for elucidating the pathogenesis of anemia and for inferring its potential risk in patients with hypertension.

Management of pulmonary hemodynamics prior to delivery in a pregnant woman with development of decompensated pulmonary arterial hypertension.

Prompt termination of pregnancy in patients with decompensated pulmonary arterial hypertension (PAH) is imperative for improvement of maternal hemodynamics, but such termination may also result in maternal death due to further deterioration of PAH immediately after delivery. However, there have been limited reports on whether implementation of PAH therapy with continuation of pregnancy improves the maternal outcome, especially in treatment-naïve patients with PAH. A 24-year-old woman was admitted to our hospital with a chief complaint of dyspnea (WHO functional class IV) at 22 weeks and 3 days of gestation. She was diagnosed with PAH accompanied by right heart failure and low cardiac output. Intensive treatment was initiated with inotropic agents, oxygen therapy, and PAH therapy, resulting in improvement of her hemodynamics. A caesarean section was performed at 23 weeks and 3 days. Although her pulmonary arterial pressure transiently increased with oxygenation deteriorating immediately after delivery, worsening PAH improved without mechanical circulatory support. She continued receiving pulmonary vasodilators without relapse of pulmonary hypertension for three years. The improvement of pulmonary hemodynamics prior to delivery with PAH therapy led to a favorable outcome after delivery. Learning objective: Pulmonary hemodynamics in pregnant patients with pulmonary arterial hypertension (PAH) can deteriorate with the continuation of pregnancy, while termination can also cause PAH surge immediately after delivery. In treatment-naïve patients with PAH, who are most likely to benefit from PAH therapy, implementation of PAH therapy with continuation, even with a decompensated status, may improve the hemodynamics prior to delivery, resulting in a favorable outcome after delivery.

Quantifying longitudinal right ventricular dysfunction in patients with old myocardial infarction by using speckle-tracking strain echocardiography.

BACKGROUND: We investigated longitudinal right ventricular (RV) function assessed using speckle-tracking strain echocardiography in patient with myocardial infarction (MI), and identified the contributing factors for RV dysfunction. METHODS: We retrospectively studied 71 patients with old MI (the OMI group) and 45 normal subjects (the Control group) who underwent a transthoracic echocardiography. Global and free wall RV peak systolic strains (PSSs) in the longitudinal direction were measured by using speckle-tracking strain echocardiography. Left ventricular (LV) PSSs were measured in the longitudinal, radial and circumferential directions. Cardiac hemodynamics including peak systolic pulmonary artery pressure was also assessed non-invasively. Plasma brain natriuretic peptide (BNP) levels were measured in all patients. RESULTS: In the OMI group, 73% of the patients had a normal estimated peak systolic pulmonary artery pressure of less than 35 mmHg. Global and free wall RV PSS were impaired in the OMI group compared with the Control group, and these RV systolic indices were significantly associated with heart rate, logarithmic transformed plasma BNP, greater than 1 year after onset of MI, Doppler-derived estimated pulmonary vascular resistance, LV systolic indices, LV mass index, infarcted segments within a territory of the left circumflex artery and residual total occlusion in the culprit right coronary artery. Multivariable linear regression analysis indicated that reduced longitudinal LV PSS in the 4-chamber view and BNP levels ≥500 pg/ml were independently associated with reduced global and free wall RV PSS. Moreover, when patients were divided into 3 groups according to plasma BNP levels (BNP <100 pg/ml; n = 31, 100 ≤BNP <500 pg/ml; n = 24, and BNP ≥500 pg/ml; n = 16), only patients with BNP ≥500 pg/ml had a strong correlation between RV PSS and longitudinal LV PSS in the 4-chamber view (r = 0.78 for global RV PSS and r = 0.71 for free wall RV PSS, p <0.05). CONCLUSION: Longitudinal RV systolic strain depends significantly on longitudinal LV systolic strain especially in patients with high plasma BNP levels, but not on estimated peak systolic pulmonary artery pressure. These results indicate that process of RV myocardial dysfunction following MI may be governed by neurohormonal activation which causing ventricular remodeling rather than increased RV afterload.

The cardiac computed tomography-derived extracellular volume fraction predicts patient outcomes and left ventricular mass reductions after transcatheter aortic valve implantation for aortic stenosis.

BACKGROUND: Transcatheter aortic valve implantation (TAVI) improved outcome of patients with severe aortic valve stenosis (AS). Myocardial fibrosis is associated with AS-related pathological left ventricular (LV) remodeling and predicts cardiovascular mortality after TAVI. The present study aimed to investigate the impact of preoperative extracellular volume (ECV) assessed by computed tomography (CT) on left ventricular mass (LVM) regression and clinical outcomes in severe AS patients after TAVI. METHODS: We examined 71 consecutive severe AS patients who underwent CT with ECV determination before TAVI. ECV was calculated as the ratio of the change in Hounsfield units in the myocardium and LV blood before and after contrast administration, multiplied by (1-hematocrit). Delayed scan was performed at 5 min after contrast injection. Echocardiography was performed before and 6 months after TAVI. The primary endpoint was heart failure (HF) hospitalization after TAVI. Patients were divided into two subgroups according to the median value of global ECV with 32 % (Low-ECV group: n = 35, and High-ECV group: n = 36). RESULTS: No significant differences were observed in background characteristics between the 2 groups. However, the preoperative LV ejection fraction and LVM index were similar between the 2 groups, the Low-ECV group had greater LVM index reduction than the High-CV group after 6 months (p < 0.001). Kaplan-Meier curves demonstrated that the High-ECV group had significantly higher rate of HF hospitalization than the Low-ECV group (p = 0.016). In addition, multivariate analyses identified high global ECV as an independent predictor of HF hospitalization (HR 10.8, 95 % confidence interval 1.36 to 84.8, p = 0.024). CONCLUSION: The low preoperative ECV assessed by CT is associated with the greater LVM regression, and predict better outcome in AS patients after TAVI.

Role of haemodialytic therapy on left ventricular mechanical dyssynchrony in patients with end-stage renal disease quantified by speckle-tracking strain imaging.

BACKGROUND: Abnormal myocardial loading can contribute to left ventricular (LV) mechanical dyssynchrony in patients with end-stage renal disease (ESRD). The aims of this study were to characterize and quantify LV function and mechanical dyssynchrony in patients with ESRD, and to elucidate the impact of haemodialytic (HD) therapy on these parameters by speckle-tracking strain imaging. METHODS: Twenty-three patients with ESRD (63 ± 11 years) before (pre-dialysis group) and after HD therapy (post-dialysis group) and 28 normal subjects (control group; 60 ± 10 years) were examined by echocardiography. Global and segmental LV peak systolic strain (PSS) were analysed, and LV mechanical dyssynchrony was assessed by calculating the standard deviation of the segmental time-to-PSS over longitudinal, circumferential or radial regions, respectively. RESULTS: Global PSS and LV ejection fraction in the pre-dialysis group were similar to those in the control group, and were not altered by HD therapy. LV mechanical dyssynchronies in the longitudinal and radial directions, but not in the circumferential direction, were significantly greater in the pre-dialysis group than those in the control group [longitudinal direction: 63 ± 15 (P < 0.05 vs. the control group) vs. 49 ± 15 ms, circumferential direction: 44 ± 24 vs. 41 ± 23 ms, and radial direction: 47 ± 29 (P < 0.05 vs. the control group) vs. 16 ± 18 ms]. HD therapy dramatically improved only the radial LV dyssynchrony in the post-dialysis group (23 ± 24 ms, P < 0.05 vs. the pre-dialysis group). CONCLUSIONS: The presence of ESRD was associated with longitudinal and radial LV dyssynchronies. In addition, HD therapy dramatically improved radial LV dyssynchrony, which strongly indicates that only radial LV dyssynchrony is preload dependent among the three LV systolic directions.

Comparison of haemodynamic response to muscle reflex in heart failure with reduced vs. preserved ejection fraction.

AIMS: Isometric handgrip (IHG) training reduces the blood pressure in patients with hypertension. It is unclear how IHG exercise affects the haemodynamics and cardiovascular function through the muscle reflex in patients with heart failure (HF) with reduced (HFrEF) and preserved ejection fraction (HFpEF). METHODS AND RESULTS: Twenty patients (HFrEF: n = 10, HFpEF: n = 10) underwent left ventricular (LV) pressure-volume assessments using a conductance catheter and microtip manometer to evaluate haemodynamics, LV and arterial function, and LV-arterial coupling during 3 min of IHG at 30% of maximal voluntary contraction (MVC), followed by 3 min of post-exercise circulatory arrest (PECA). Three minutes of IHG exercise produced significant and modest increases in the heart rate (HR) and LV end-systolic pressure (LVESP), respectively, in both HFpEF and HFrEF groups. In HFrEF, the increase in LVESP was caused by the variable increase in effective arterial elastance (Ea), which was counterbalanced by the increase in LV end-systolic elastance (Ees), resulting in a maintained Ees/Ea. In HFpEF, the increase in LVESP was not accompanied by changes in Ea, Ees, Ees/Ea, or LV end-diastolic pressure. LVESP during PECA was not maintained in HFpEF, suggesting smaller metabo-reflex activity in HFpEF. CONCLUSIONS: The IHG exercise used in this study may increase the LVESP and LVEDP without detrimental effects on cardiac function or ventricular-arterial coupling, especially in HFpEF patients. The effects of IHG exercise on haemodynamics and ventricular-arterial coupling may be affected by the patient background and the type and intensity of the exercise.

Successful percutaneous treatment of recurrent post-infarction ventricular septal rupture using an Amplatzer duct occluder.

A 78-year-old woman was brought to our hospital for chest pain with shock status. An electrocardiogram showed ST elevation in the precordial leads. Echocardiography showed an anteroseptal wall motion abnormality with left-to-right shunt at the apex. Emergency coronary angiography revealed occlusion in the mid portion of the left anterior descending artery, and left ventriculography showed ventricular septal rupture (VSR). Despite successful emergency surgical VSR repair, the VSR recurred 10 days after surgery, and the patient required intra-aortic balloon pumping and mechanical ventilation. Although reoperation for VSR closure was attempted 33 days after admission, open heart surgery was not completed due to severe tissue adhesions from the prior cardiac surgery. The patient ultimately underwent transcatheter closure for VSR using an Amplatzer duct occluder 56 days after hospital admission, and her hemodynamics markedly improved. She was transferred to a regional hospital for rehabilitation without oxygen therapy or intravenous treatments 81 days after the percutaneous intervention. In conclusion, percutaneous device closure of post-infarction VSR may be an alternative treatment to surgical repair for inoperable cases. .

Postdischarge Light-Intensity Physical Activity Predicts Rehospitalization of Older Japanese Patients With Heart Failure.

PURPOSE: Regular physical activity (PA) is recommended for patients with heart failure (HF). However, the clinical and social characteristics of older HF patients with low-level PA and the impact of light-intensity PA on 6-mo postdischarge adverse cardiovascular events are still unclear. METHODS: Forty-one older patients who had been admitted because of decompensated HF (American College of Cardiology [ACC]/American Heart Association [AHA] HF classification stage C/D: 76 ± 5 y) were prospectively enrolled. Light-intensity (1.5-2.9 metabolic equivalents [METs]) and moderate-intensity (≥3 METs) PAs were determined by triaxial accelerometry for at least 7 d postdischarge. Six-min walk distance and 36-item Short Form questionnaire (SF-36) score were evaluated at discharge. HF patients were stratified into either the HFPA-high or HFPA-low group according to median daily PA. Twenty-nine older ACC/AHA stage A/B outpatients (HF-risk), who were at risk for HF but no symptoms of HF had developed, also completed these assessments. Clinical predictors for 6-mo postdischarge HF rehospitalization were assessed. RESULTS: HF patients were anemic and less active. HFPA-low patients were less likely to engage in household work, took fewer steps, and had less light and moderate-intensity PA than HFPA-high patients. There were no differences in 6-min walk distance, SF-36 score, or left ventricular ejection fraction between HFPA-low and HFPA-high patients. Postdischarge PA, especially light-intensity PA, was independently associated with HF rehospitalization. CONCLUSION: Low volume of PA postdischarge, especially at 1.5 to 2.9 METs, predicts 6-mo postdischarge HF rehospitalization in older HF patients.

Utility of strain-echocardiography in current clinical practice.

Myocardial strain measurement with two-dimensional speckle-tracking echocardiography (2D-STE) is of paramount importance in the early detection of subclinical left ventricular (LV) systolic dysfunction and the prediction of patient outcomes in various types of heart disease, especially when assessed with global longitudinal strain (GLS). The routine application of myocardial strain parameters requires the definition of normal values and an understanding of their reliabilities. One of the most important potential limitations to widespread clinical application of this technique is inter-vendor differences in normal strain values. Recent clinical reports indicate that the smallest differences were noted in GLS measurements among three orthogonal directions. Because the contribution of circumferential fibers to LV myocardial thickening is greater than that of longitudinal fibers, patients who have a reduced LV ejection fraction can have impaired global circumferential strain (GCS), which reflects more advanced intrinsic myocardial systolic dysfunction and is thus closely related to a poor prognosis. Since STE-derived strain analysis allows us to define the timing of the regional myocardial peak systolic deformation, it permits the assessment of LV mechanical dyssynchrony. The severity of LV mechanical dyssynchrony in the short axis plane, i.e., radial and/or circumferential strain imaging, is favorable for predicting the clinical response to cardiac resynchronization therapy. GLS in the right ventricular (RV) four-chamber view has recently been used as a surrogate for global RV function because longitudinal shortening is the major contributor to overall RV performance. Finally, 2D-STE can be used to quantify and characterize RV mechanical dyssynchrony in various diseases including acute pulmonary thromboembolism and chronic pulmonary hypertension.

Interrelationship between haemodynamic state and serum intact parathyroid hormone levels in patients with chronic heart failure.

OBJECTIVE: To assess the impact of serum intact parathyroid hormone (PTH) levels on haemodynamic state and their relations by comparing plasma B-type natriuretic peptide (BNP) levels. DESIGN: Cross-sectional study in molecular epidemiology. SETTING: Mie University Hospital, Tsu, Japan. PATIENTS: Consecutive 105 patients with chronic heart failure (CHF). MAIN OUTCOME MEASURES: Serum intact PTH and plasma BNP levels were assessed simultaneously with right heart catheterisation. RESULTS: Although serum intact PTH levels (46±25 pg/ml) were within the normal range (<65 pg/ml) in 87% of patients, log-transformed intact PTH levels significantly correlated with pulmonary capillary wedge pressure (PCWP: 15±9 mm Hg, r=0.55, p<0.05) and heart rate (73±14/min, r=0.40, p<0.05), whereas log-transformed intact PTH levels were inversely correlated with stroke volume index (SVI: 38±11 ml/m(2), r=-0.52, p<0.05) and cardiac index (2.6±0.7 l/min/m(2), r=-0.41, p<0.05) in all patients. PCWP and SVI were independent determinants of log-transformed intact PTH levels (ß=0.40 and -0.37, p<0.05, respectively) after adjusting for variables associated with PTH. Conversely, after adjusting for variables associated with CHF, log-transformed intact PTH levels were an independent determinant of PCWP, SVI, heart rate and cardiac index (ß=0.38, -0.33, 0.32, and -0.25, p<0.05, respectively), and might be defined as a superior determinant of SVI and cardiac index compared with log-transformed BNP levels using stepwise multivariate regression analyses. CONCLUSIONS: Increased PCWP and decreased SVI independently contribute to elevated intact PTH in patients with CHF.

Echocardiographic estimation of pulmonary capillary wedge pressure using the combination of diastolic annular and mitral inflow velocities.

BACKGROUND: We aimed to identify the clinical utility of a simple echocardiographic approach for estimating the pulmonary capillary wedge pressure (PCWP) on the basis of the combined assessment of mitral inflow and tissue Doppler mitral annular velocities. METHODS: We retrospectively enrolled 165 patients who underwent both echocardiographic examination and right heart catheterization, and determined the diagnostic accuracy of echocardiography-derived parameters for estimating PCWP >18 mmHg. RESULTS: Eighty-three patients had preserved left ventricular (LV) ejection fraction ≥50% (the PEF group) and 82 patients had reduced LVEF <50% (the REF group). The PEF group had higher peak early mitral annular velocity (E') compared with the REF group. Eight patients in the PEF group but none in the REF group had normal LV diastolic function, represented as E' >8 cm/s, and all of these patients had normal inflow pattern. The mean PCWP had the strongest correlation with the ratio of the peak early mitral inflow velocity (E) to the peak late diastolic mitral inflow velocity during atrial contraction (E/A) in both groups, followed by the left atrial diameter and E/E' in both patient groups. Receiver operating characteristic (ROC) analysis demonstrated that the combination of abnormal E' ≤8 and elevated E/A had high diagnostic accuracy compared with E/E' in both patient groups with different cutoff values of E/A (1.81 in the PEF group and 1.16 in the REF group) for predicting mean PCWP >18 mmHg. CONCLUSION: After excluding patients with normal diastolic function using E', conventional E/A is a reliable marker for predicting high PCWP and is superior to E/E'.

Ventricular function and dyssynchrony quantified by speckle-tracking echocardiography in patients with acute and chronic right ventricular pressure overload.

BACKGROUND: The aim of this study was to noninvasively investigate right ventricular and left ventricular (LV) adaptation to right ventricular pressure overload in patients with acute pulmonary thromboembolism (APTE) and chronic pulmonary artery hypertension (CPAH). METHODS: Thirty-seven patients with APTE, 36 patients with CPAH, and 33 controls were retrospectively enrolled. Myocardial deformation and wall motion were analyzed using speckle-tracking strain and displacement imaging echocardiography in the right and left ventricles. The standard deviation of the heart rate-corrected intervals from QRS onset to peak systolic strain and peak systolic displacement (PSD) for the six segments was used to quantify right ventricular and LV mechanical dyssynchrony (peak systolic strain dyssynchrony and PSD dyssynchrony). The myocardial performance index in both ventricles was also evaluated. RESULTS: The APTE and CPAH groups had reduced ventricular performance (LV myocardial performance index, 0.40 ± 0.10, 0.66 ± 0.18 [P < .05 vs controls], and 0.58 ± 0.19 [P < .05 vs controls] in the control, APTE, and CPAH groups, respectively) and large mechanical dyssynchrony (LV longitudinal PSD dyssynchrony, 58 ± 41 msec, 119 ± 49 msec [P < .05 vs controls], and 83 ± 37 msec [P < .05 vs controls and the APTE group] in the control, APTE, and CPAH groups, respectively) in both ventricles. Multiple regression analysis indicated that LV longitudinal PSD dyssynchrony in the APTE group and the LV eccentricity index in the CPAH group were independent determinants of LV myocardial performance index. CONCLUSIONS: Pathophysiologic mechanisms that regulate ventricular performance vary depending on whether the ventricles are exposed to acute or chronic right ventricular pressure overload.