Systolic Strain Abnormalities to Predict Hospital Readmission in Patients With Heart Failure and Normal Ejection
Steven M Borer1, Aravind Kokkirala1, David M O'Sullivan1
1Henry Low Heart Center, Hartford Hospital, Hartford, CT, USA.
Insights
Subtle systolic abnormalities in heart failure with normal ejection fraction (HFNEF) do not predict readmission. However, elevated E/e' measurements are a significant predictor of hospital readmission in HFNEF patients.
Area of Science:
- Cardiology
- Echocardiography
- Heart Failure Research
Background:
- The pathogenesis of heart failure with normal ejection fraction (HFNEF) remains incompletely understood.
- Subtle systolic function abnormalities are hypothesized to contribute to HFNEF.
- Investigating systolic strain and strain rate as potential markers for adverse outcomes in HFNEF.
Purpose of the Study:
- To evaluate the role of systolic strain and strain rate in predicting hospital readmission for HFNEF.
- To identify echocardiographic markers associated with adverse outcomes in HFNEF patients.
Main Methods:
- Analysis of 100 consecutive patients with new-onset HFNEF (left ventricular ejection fraction > 50%).
- Exclusion of patients with myocardial infarction, severe valvular disease, or severe left ventricular hypertrophy.
- Measurement of average peak systolic strain and strain rate using off-line grey scale imaging.
- Comparison of systolic parameters and E/e' between readmitted and readmission-free patient groups.
Main Results:
- Systolic strain and strain rates were reduced in HFNEF patients compared to controls, but did not differ significantly between readmitted and readmission-free groups.
- Readmitted patients showed significantly higher E/e' ratios compared to those free from readmission (14.5 vs. 11.0, P=0.013).
- Elevated E/e' was identified as an independent predictor of HFNEF readmission (OR 1.189, P=0.021).
Conclusions:
- Reduced systolic strain and strain rates in HFNEF patients do not predict hospital readmission.
- Elevated E/e' is a significant independent predictor of readmission in patients with HFNEF.
- E/e' may serve as a valuable prognostic marker for HFNEF management and risk stratification.
Background:
Despite intensive investigation, the pathogenesis of heart failure with normal ejection fraction (HFNEF) remains unclear. We hypothesized that subtle abnormalities of systolic function might play a role, and that abnormal systolic strain and strain rate would provide a marker for adverse outcomes.
Methods:
Patients of new CHF and left ventricular ejection fraction > 50% were included. Exclusion criteria were recent myocardial infarction, severe valvular heart disease, severe left ventricular hypertrophy (septum >1.8 cm), or a technically insufficient echocardiogram. Average peak systolic strain and strain rate were measured using an off-line grey scale imaging technique. Systolic strain and strain rate for readmitted patients were compared with those who remained readmission-free.
Results:
One hundred consecutive patients with a 1st admission for HFNEF from January 1, 2004 through December 31, 2007, inclusive, were analyzed. Fifty two patients were readmitted with a primary diagnosis of heart failure. Systolic strain and strain rates were reduced in both study groups compared to controls. However, systolic strain did not differ significantly between the two groups (-11.7% for those readmitted compared with -12.9% for those free from readmission, P = 0.198) and systolic strain rates also were similar (-1.05 s-1 versus -1.09 s-1, P = 0.545). E/e' was significantly higher in readmitted patients compared with those who remained free from readmission (14.5 versus 11.0, P = 0.013). E/e' (OR 1.189, 95% CI 1.026-1.378; P = 0.021) was found to be an independent predictor for HFNEF readmission.
Conclusions:
Among patients with new onset HFNEF, SS and SR rates are reduced compared with patients free of HFNEF, but do not predict hospital readmission. Elevated E/e' is a predictor of readmission in these patients.
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