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Results for “Ventricular Dysfunction, Right”

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At least 1,369 records · Page 76Linked to original sources
PubMed1992

[Diastolic function of the right ventricle in patients with lung diseases as evidenced by Doppler echocardiography].

The study was undertaken to examine the most informative Doppler echocardiographic parameters to determine right ventricular diastolic function in 46 pulmonological patients with pulmonary hypertension and right ventricular failure and 11 healthy individuals. The patients exhibited the highest blood velocity in the rapid filling phase, as compared to the healthy persons. They also demonstrated increased maximum blood velocities in the rapid filling phase on atrial systole and prolonged late blood flow in the rapid filling phase. Thus, Doppler echocardiography may be useful in the non-invasive diagnosis of right ventricular diastolic dysfunctions.

Adult↗
PubMed2006

Right heart function in scleroderma: insights from myocardial Doppler tissue imaging.

To use Doppler tissue imaging to evaluate heart function and to predict rehospitalization rate in progressive systemic sclerosis, we studied 40 patients (limited in 24 patients, diffuse in 16 patients) with chest roentgenography, pulmonary function test, routine echocardiography, and myocardial Doppler tissue. Another 45 volunteers without any sign of heart failure served as the control group. Significant difference of echocardiographic parameters was found in peak transmitral early diastolic velocity, right ventricular (RV) ejection fraction (EF) (RVEF), pulmonary artery systolic pressure, and Doppler tissue parameters of the RV and septum (peak transmitral early diastolic velocity, P = .012; RVEF, P < .0001; pulmonary artery systolic pressure, P < .0001). The parameters derived by pulsed wave Doppler tissue decreased in RV, including peak systolic myocardial velocity (Sm), early diastolic velocity, late diastolic velocity, and myocardial performance index. RVEF and left ventricular EF were estimated by Simpson's method. RV-Sm could be used to identify RV failure. Receiver operating characteristic area under the curve for RV-Sm was 0.935. RV-Sm less than 11 cm/s indicted RVEF less than 40% with sensitivity of 87% and specificity of 86%. Contrary to expectation, pulmonary artery systolic pressure was not so well correlated with RV function. The frequency of admission was reverse correlated with decrement of RV-Sm in patients with RV-Sm less than 12 cm/s. We conclude that in progressive systemic sclerosis, RV systolic dysfunction is common and appears to be a result of pulmonary hypertension, disturbance of myocardial microcirculation, and myocardial fibrosis. Pulmonary hypertension was not well correlated with RV dysfunction; it suggested pulmonary hypertension was not the only cause of RV failure. Primary right heart involvement was the other possible cause. By myocardial Doppler tissue imaging, we can predict the frequency of hospitalization; it suggests simultaneous involvement of heart, skin, lung, and other organs. RV-Sm more than 12 cm/s predicted a decreased likelihood of readmission to the hospital.

Adult↗
PubMed1997

[Radiofrequency ablation in ventricular extrasystole of the right ventricular outflow tract].

The series of five patients with symptomatic isolated right ventricular outflow tract ectopy and no structural heart disease which were successfully treated with radiofrequency ablation of the ectopic focus are reported in order to discuss radio-frequency ablation as an alternative treatment in patients with right ventricular outflow tract ectopy without ventricular tachycardia.

Cardiac Complexes, Premature↗
PubMed1996

Arrhythmogenic right ventricular dysplasia.

Right ventricular dysplasia is a primary disorder of the right ventricular myocardium characterised by a progressive replacement by adipose or fibrous tissue, proceeding from the epicardium towards the endocardium. Right ventricular dysplasia with the predominant clinical manifestation of an arrhythmia of right ventricular origin is defined as arrhythmogenic right ventricular dysplasia. There is, however, a wide spectrum of clinical presentation and physical findings owing to the polymorphism of the condition. The aetiology of right ventricular dysplasia remains unknown. Right ventricular angiography is currently regarded as the gold standard for the clinical diagnosis of right ventricular dysplasia Ventricular endomyocardial biopsy can be useful in confirming the diagnosis but a negative biopsy does not exclude the diagnosis of right ventricular dysplasia. There have been few electrophysiological studies and these, in general, have failed to help in risk stratification. Treatment is focused on the prevention of potentially lethal right ventricular electrical instability.

Adipose Tissue↗
PubMed2004

Bidirectional cavopulmonary shunt for acute right ventricular failure in an adult patient.

Right ventricular failure due to right coronary occlusion is an uncommon but serious complication of acute aortic dissection. We report a patient with right coronary occlusion from acute type A aortic dissection who developed right ventricular failure that persisted after proximal aortic repair, rendering weaning from extracorporeal circulation unsuccessful. With a bidirectional cavopulmonary shunt and the use of an intraaortic balloon, the patient could be weaned successfully from cardiopulmonary bypass. This procedure may be an alternative to a right ventricular assist device in selected candidates.

Adult↗
PubMed2003

Clinical and electrophysiological differences between patients with arrhythmogenic right ventricular dysplasia and right ventricular outflow tract tachycardia.

AIMS: Radiofrequency catheter ablation is considered first line treatment for symptomatic patients with right ventricular outflow tract tachycardia (RVOT). The role of ablation in arrhythmogenic right ventricular dysplasia (ARVD) is more limited. As such, differentiating between the two conditions is essential. METHODS AND RESULTS: This study compared non-invasive findings, magnetic resonance images (MRI), invasive electrophysiological characteristics, results of ablation and long-term outcome in 50 consecutive patients with RVOT (33) or ARVD (17). Structural abnormalities were uniform in the ARVD group; in addition 18 (54%) of the RVOT tachycardia group had MRI abnormalities. At electrophysiological study the tachycardia in the ARVD group displayed features of re-entry in over 80%, but behaved with a triggered automatic basis in 97% with RVOT. Ablation was complete or partial success in 12 (71%) patients with ARVD and ventricular tachycardia (VT) recurred in eight (48%). In the RVOT patients, ablation was a complete success in 97% with recurrent VT in 6%. Long-term success in the RVOT patients was 95% in both patients with and without MRI abnormalities. CONCLUSIONS: Electrophysiological characterization can differentiate ARVD from RVOT. The finding of abnormalities on MRI does not have any bearing on arrhythmia mechanism, acute or long-term success of RFA.

Adolescent↗
PubMed2004

[Right ventricular function in ARDS and mechanical respiration].

The right ventricle is the stepchild of intensive care medicine. In diseases of the lung mainly when the relationship between ventilation and perfusion is disturbed, assisted respiration with positive end-expiratory pressure (PEEP) is essential to improve oxygenation. The serious damage to the lung parenchyma as seen in adult (acute) respiratory distress syndrome (ARDS) and pneumonia has considerable consequences for cardiac function. Whereas left ventricular function remains almost completely unaffected well into late stages of the disease, the right ventricle is subjected early to stress from the underlying disease and mechanical ventilation. The effects of therapeutic measures aimed at maintaining oxygenation and ventilation partially have negative consequences for right ventricular function and encourage the development of acute cor pulmonale. They can be the cause of right-sided heart failure.

Heart Failure↗
PubMed2002

When should we consider right ventricular support?

Ventricular assist systems have become an important tool in the surgical management of acute and chronic heart failure. While indications for left ventricular support ar e well established, criteria for right ventricular support are much less defined. This report summarizes current knowledge on the implantation of right ventricular support in clinical settings of isolated right heart failure, biventricular failure, postcardiotomy failure and post-LVAD right heart failure.

Cardiac Output, Low↗
PubMed2001

Prognostic implications of right atrial ischemic dysfunction in patients with biventricular inferior infarction: transesophageal echocardiographic analysis.

In order to determine the effect of right atrial dysfunction on clinical outcome, six patients with inferior myocardial infarction with extension to right ventricle and right atrium involving only obstructions of the right coronary artery were examined with transesophageal echocardiography (TEE) at the time of the event. Five of the patients were reexamined 15 to 55 months later. Two patients underwent thrombolysis and maintained ratios of right-to-left ventricular diameters of less than 1, as well as normal convexity of the interatrial septum. One patient had spontaneous reperfusion of the right coronary artery, reduction in right ventricular diameter, and normalization of interatrial septum. Another patient underwent delayed angioplasty and manifested a diminished wall movement score (WMS) in the follow-up echocardiogram. One patient died during his first hospitalization with significant right ventricular dilatation, inverted convexity of the interatrial septum, and right atrial thrombosis. The last patient died during follow-up with right ventricular dilatation, increased WMS, right atrial akinesis, and inverted interatrial convexity. Serial TEE examination of patients with infarction of the left ventricular inferior wall is a safe technique for determining the degree of the extension of the ischemic process to the right chambers.

Adult↗
PubMed1996

Efficacy and safety of a percutaneous right ventricular assist system.

BACKGROUND: Mechanical right ventricular assistance is necessary in the management of profound right ventricular failure resistant to medical therapy. Conventional right ventricular assistance requires a thoracotomy. We developed a technique for assisting the failing right ventricle without thoracotomy. METHODS: We implanted the percutaneous right ventricular assist system in animals to test its feasibility and safety. A feasibility study was performed in a right ventricular failure model using 12 open chest dogs, and we examined the effects of the system hemodynamically. Next, the system was implanted into 6 goats and driven for 2 to 8 days. RESULTS: Institution of the percutaneous right ventricular assist system revealed overall hemodynamic improvement on right ventricular failure in dogs. In the goat experiment, no animal died from cannula-related complications. No damage to the intracardiac structures and no pulmonary edema were seen. Plasma free hemoglobin concentration did not exceed 10 mg/dL. CONCLUSIONS: The percutaneous right ventricular assist system is safe and effective in the management of right ventricular failure.

Animals↗