Hfss calculator

In the heart failure population, risk prediction is more challenging, with the severity of the heart failure having much more impact on expected survival than simple patient status as younger versus older. Multivariate risk scores are generated by combining a selection of these individual markers, generally using a logistic regression or Cox proportional hazard model.

Overall, they provide a powerful means of predicting the likelihood of outcomes in heart failure patients, making them quite valuable in selecting patients for advanced therapies and in helping patients and their families plan for the future. This chapter will focus on a selection of the more commonly used risk models and their clinical applications.

Many of the individual risk factors that predict patient outcomes are intuitive. Ejection fraction has not, however, been as predictive of outcomes in hospitalized cohorts.

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Abnormalities of many biomarkers predict worsened outcomes. High-sensitivity troponins have shown predictive power, as have newer markers such as ST2 or gal The most widely validated lab marker is B-type natriuretic peptide BNPwith a doubling of mortality risk seen for normal versus abnormal range BNP.

BNP also correlates with other important clinical outcomes, such as increased risk of hospitalization with progressively more abnormal values. Some clinical data points show a reverse epidemiology, with lower body mass index BMI and cholesterol levels serving as favorable prognostic markers in the general population, but as unfavorable prognostic markers in the heart failure population. The SHFM was developed as a predictor of life expectancy and 1- 2- and 5- year mortality in heart failure patients.

There is also a downloadable application that is available for Windows, Macintosh, and several portable platforms. The risk score was developed via Cox proportional hazards modeling. It is scored as a continuous variable that can be converted to a percentage chance of survival at various time points.

A screenshot of the Windows version of the web calculator is shown in Figure 1. Assessing prognosis can be quite challenging. Some patients are clearly floridly decompensated, barely ambulatory, and in need of inpatient management for acute exacerbation of their heart failure. Others have minimal functional decline or evidence of laboratory or hemodynamic dysfunction and have a much better prognosis. Multiple studies have shown that neither patients nor providers are particularly good at providing accurate assessments of expected mortality.

The value of the SHFM is in allowing more accurate risk stratification than allowed by holistic clinician assessment.

hfss calculator

The value of the SHFM in lower risk patients is both in providing more knowledge for patients and providers about likely prognosis, and in allowing a more clear understanding of the survival changes that can occur with starting new heart failure medications or placing life-saving devices, such as implantable cardiac defibrillators or cardiac resynchronization therapy. Peak consumption of oxygen with maximal exertion has long been used as a criterion for listing for heart transplantation.

The HFSS was developed to integrate additional clinical information and provide more accurate risk stratification. It divides patients into high- intermediate- and low-risk strata. The HFSS is calculated using seven clinical variables.

The score is calculated as 0. Scores less than 7. Use of the HFSS is limited by the requirement for peak consumption of oxygen with maximal exertion to calculate the score. Patients in the medium- and high-risk category are appropriate for consideration of listing for heart transplantation or placement of ventricular assist device, while low-risk patients are appropriately deferred for consideration of these advanced heart failure therapies.Just enter the given values for trace thickness, substrate heights, trace width and substrate dielectric in the calculator above and press the "calculate" button.

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The default units for all given values, except the substrate dielectric, is in mil. Microwave antennas and couplers, as well as some filters, can be created using the microstrip. However, microstrips cannot handle power levels as high as waveguides can. Microstrips also have issues in power loss, cross-talk and unintentional radiation because they are not enclosed like the waveguide.

Aside from microwave applications, microstrips also find themselves in high-speed digital PCB design. Don't have an AAC account? Create one now. Forgot your password? Click here. Latest Projects Education. Tools Microstrip Impedance Calculator. Home Tools Microstrip Impedance Calculator.

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Microstrip Impedance Calculator This calculator helps you compute the characteristic impedance of a microstrip. Inputs Trace Thickness. Substrate Height. Trace Width. Substrate Dielectric.

Impedance Z :. You May Also Like. Log in to comment. Sign In Stay logged in Or sign in with. Continue to site.Is there any compilation of examples using the field calculator? The online help is very weak in this area Thanks for this information, the Cookbook has some useful examples indeed, except for Xform.

I've experimented with this feature and cannot deduce its utility. However, I couldn't access the transformed components without getting an "type mismatch" error. I found these components using cartesian coordinates, just thought there may be an easier way with Xform! Then wondered what else I might be missing without a good example set. Home Leaderboard Activity Badges. You must enable JavaScript to be able to use this site in full.

Physics Simulation Electromagnetics Field calculator examples? TomE posted this 17 March Kind regards.

Assessing Prognosis Using Risk Scores

Permalink 0 0 0. Order By: Standard Newest Votes. Peter Serano posted this 18 March TomE posted this 18 March Search in Post Topic. Popular Tags fluent ansys udf workbench cfd asc mesh fluid-dynamics error mechanical apdl cfx meshing structural-mechanics maxwell hfss static-structural general transient student This Weeks High Earners peteroznewman 99 pblarsen 49 kkanade 43 abenhadj 42 Aniket 28 rwoolhou 27 pnisc 20 tsiriaks 13 PippoLomi 13 ekostson Recent Activity mecdesign is a new member in the forum.The Heart Failure Risk Calculator presents 1 and 3 year all-cause mortality estimates for people with heart failure, as developed and presented in Pocock et al.

The intended audience for the Risk Calculator is health care professionals knowledgeable in cardiology and the management of people with heart failure.

The model was constructed from research data collected from and may not be indicative of current or future trends in heart failure management. The variability in risk between studies and cohorts is greater than that explained by known risk factors.

True risk within any centre may be higher or lower than the stated estimates for 1 and 3 year mortality. This may affect a comparison of the current result to risk assessments before this date. Patient Information Return to terms and conditions Patient Reference. Gender Female Male. Diabetes Yes No. Heart failure diagnosed within the last 18 months Yes No. Current smoker Yes No. NYHA Class 1 2 3 4. Receives beta blockers Yes No. Systolic blood pressure mmHg.Patient has any history of a cerebral vascular accident excluding reversible ischemic neurological deficit RIND and transient ischemic attack TIA.

The technical report may be accessed here: QualityNet.

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Send comments to heart. Demographics Age of patient in years. Sex of patient. Presentation Patient suffered cardiac arrest during current hospital stay. Patient was unable to walk or was unable to walk without assistance. History Patient has any history of hypertension excluding pulmonary hypertension. Patient has any history of diabetes excluding diabetes insipidus or gestational diabetes. Patient has any history or current finding of congestive heart failure.

hfss calculator

Patient had prior percutaneous coronary intervention PCI. The patient had prior coronary artery bypass graft CABG surgery. Patient has any history or current finding of moderate or severe aortic stenosis.

Physical Exam on admission Patient's systolic blood pressure on admission. Patient's diastolic blood pressure on admission. Patient's heart rate on admission. Diagnostics on admission Patient's sodium on admission. Patient's potassium on admission.

Patient's blood urea nitrogen on admission. Patient's creatinine on admission. Patient's white blood cell count on admission. Click here to access our Readmission Risk Calculators.Remember Me? Please help me.

Similarly for other ports. Obviously the S11 parameter must be insterted 'dimensionless'. Hope this helps. Re: hfss input impedance. Input impedance is quite simple to be evaluated. How does the HFSS calculate the impedance of a lumped port? How to know the input impedance in HFSS? How to calculate the input impedance from FDTD simulation?

hfss calculator

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Heart Failure Risk Calculator

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