Structural and Mechanical Adaptations of Right Ventricle Free Wall Myocardium to Pressure Overload

Abstract Aims Venous thromboembolism represents frequent complication of patients with severe COVID-19 disease. Several reports about atypical thrombosis are described, rarely it has been described a right venticular thrombus during the course of infection. We report a case of right endoventricular thrombosis in a patient with SARS-Cov-2 pneumonia. Methods and results A 58-year-old man was admitted to our ward for severe respiratory failure in interstitial pneumonia. The nasopharyngeal swab for COVID-19 resulted positive. Steroids and prophylaxis with LMWH were started, associated to CPAP to maintain good gas exchange. During hospitalization a venous ECD was performed with evidence of left popliteal thrombosis despite the therapy. d-Dimer was 4463 ng/ml. A new onset AF was documented at the telemetry, without troponin elevation. A cardiac ultrasound was performed showing a right endoventricular lesion of 1.8 cm adhering to the free wall of the right ventricle. A CT-pulmonary angiogram (CTPA) resulted negative for pulmonary embolism and confirmed suspected right ventricular thrombus. Treatment with fondaparinux 7.5 mg was started. After 10 days, cardiac ultrasound shown complete resolution of thrombosis, and CT confirmed the disappearing of the mass. Dabigatran 150 mg twice/day was started. Patient clinically improved and he was discharged after 20 days of hospitalization. Conclusions SARS-CoV-2 infection may cause inflammation with cytokine storm and hypercoagulability leading to venous thromboembolism. Atypical thrombus formation was reported, including right-ventricle free wall. Early caridac ultrasound was critical to make diagnosis and starting prompt treatment, therefore routine cardiac ultrasound is mandatory in severe COVID-19 patients.

Download Full-text

In vivo 31P-NMR spectroscopy of right ventricle in pigs

AJP Heart and Circulatory Physiology ◽

10.1152/ajpheart.1992.262.6.h1950 ◽

1992 ◽

Vol 262 (6) ◽

pp. H1950-H1954 ◽

Cited By ~ 2

Author(s):

G. G. Schwartz ◽

S. K. Steinman ◽

M. W. Weiner ◽

G. B. Matson

Keyword(s):

Energy Metabolism ◽

Nmr Spectroscopy ◽

Right Ventricle ◽

Signal To Noise Ratio ◽

Pressure Overload ◽

High Sensitivity ◽

Surface Coil ◽

31P Nmr Spectroscopy ◽

Free Wall

The energy metabolism of the right ventricle (RV) in vivo has been largely unexplored. The goal of this study was to develop and implement techniques for in vivo 31P nuclear magnetic resonance (NMR) spectroscopy of the RV free wall. A two-turn, crossover-design elliptical surface coil was constructed to provide high sensitivity across the thin RV wall but minimal sensitivity in the blood-filled RV cavity. In 36 open-chest, anesthetized pigs, 31P spectroscopy of the RV free wall was performed with this coil at a field strength of 2 Tesla. Spectra were obtained from 800 acquisitions in 24 min with an average signal-to-noise ratio of 13.2 for phosphocreatine (PCr). The PCr-to-ATP (PCr/ATP) ratio of porcine RV was 1.42 +/- 0.05 (mean +/- SE), uncorrected for saturation at a repetition time of 1.8 s. With the use of literature values of the time constant of longitudinal relaxation (T1) to correct for partial saturation, the RV PCr/ATP was estimated to lie between 1.7 and 2.3. Decreased RV PCr/ATP was observed during RV ischemia and pressure overload. Thus in vivo 31P spectroscopy of the RV is readily accomplished with an appropriate surface coil and can provide new information about RV energy metabolism.

Download Full-text

Can changes between days 1 and 3 in cardiac work and right ventricle free wall strain predict 30-day mortality in critical care patients presenting with sepsis?

http://isrctn.com/ ◽

10.1186/isrctn23174569 ◽

2021 ◽

Author(s):

Theophilus Samuels

Keyword(s):

Critical Care ◽

Right Ventricle ◽

Free Wall ◽

Cardiac Work ◽

Right Ventricle Free Wall ◽

Critical Care Patients

Download Full-text

Prognostic Value of Complementary Echocardiography and Magnetic Resonance Imaging Quantitative Evaluation for Isolated Tricuspid Regurgitation

Circulation Cardiovascular Imaging ◽

10.1161/circimaging.120.012211 ◽

2021 ◽

Author(s):

Tom Kai Ming Wang ◽

Kevser Akyuz ◽

Reza Reyaldeen ◽

Brian P. Griffin ◽

Zoran B. Popovic ◽

...

Keyword(s):

Right Ventricle ◽

Prognostic Value ◽

Longitudinal Strain ◽

Valve Surgery ◽

Free Wall ◽

Resonance Imaging ◽

Regurgitant Fraction ◽

Tricuspid Valve Surgery ◽

Right Ventricle Free Wall

Background: Isolated tricuspid regurgitation (TR) remains a management dilemma with poor outcomes. Echocardiography and cardiac magnetic resonance imaging (CMR) are valuable tools for evaluating TR, but their prognostic utility has rarely been studied together in this setting. We aimed to determine the prognostic value and thresholds for echocardiography and CMR parameters for isolated severe TR. Methods: Consecutive patients with isolated severe TR by echocardiography and undergoing CMR during January 2007 to June 2019 were studied. Echocardiography and CMR-derived quantitative parameters were analyzed for independent associations with and thresholds for predicting the primary end point of all-cause mortality during follow-up. Results: Among 262 patients studied, mean age was 62.8±15.6 years, 156 (59.5%) were females, 207 (79.0%) had secondary TR, and 87 (33.2%) underwent tricuspid valve surgery after CMR. There were 68 (26.0%) deaths during a mean follow-up of 2.5 years. Both CMR-derived tricuspid regurgitant fraction (per 5% increase) and right ventricle free wall longitudinal strain (per 1% decrease in magnitude) were independently associated with worse survival, with hazard ratios (95% CIs) of 1.15 (1.05–1.25) and 1.10 (1.04–1.17), respectively, along with right heart failure symptoms of 2.03 (1.14–3.60), while tricuspid valve surgery was borderline protective with 0.55 (0.31–0.997). Regurgitant fraction ≥30%, regurgitant volume ≥35 mL and right ventricle free wall longitudinal strain ≥−11% (by velocity vector imaging technique, which yields lower magnitude values than other conventional strain techniques) were the optimal thresholds for mortality during follow-up. Conclusions: TR quantification by CMR and right ventricle free wall longitudinal strain by echocardiography were the key imaging parameters independently associated with reduced survival in isolated TR, incremental to conventional clinical factors. Clinically significant thresholds for these parameters were determined and may help guide decision-making for TR management.

Download Full-text