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The diagnosis of heart failure in general practice: implications for the UK National Service Framework
Nigel Sparrow1, David Adlam, Alan Cowley
1Newthorpe Medical Practice, Chewton Street, Eastwood, Nottingham NG16 3HB, UK. nigelsparrow@aol.com
Insights
Clinical diagnosis of left ventricular systolic dysfunction in primary care is often inaccurate. Echocardiography is recommended for patients on loop diuretics due to poor predictive value of clinical features.
Area of Science:
- Cardiology
- Primary Care Medicine
- Diagnostic Accuracy
Background:
- UK National Service Framework guidelines recommend echocardiography for suspected heart failure.
- Accurate patient selection for echocardiography in primary care is challenging.
- Identifying reliable clinical predictors for left ventricular systolic dysfunction (LVSD) is unclear.
Purpose of the Study:
- To assess the accuracy of primary care LVSD diagnosis using echocardiography.
- To evaluate the sensitivity, specificity, and predictive values of clinical features for LVSD.
Main Methods:
- Cross-sectional study of 621 patients on loop diuretics across 7 general practices.
- Extracted clinical diagnoses from general practice records.
- Assessed symptoms, signs, ECG, BNP levels, and echocardiographic findings in a research clinic.
Main Results:
- LVSD (ejection fraction <40%) was found in 50% of patients prescribed loop diuretics.
- Primary care diagnoses exhibited high false positive rates.
- Clinical features, individually or combined, did not reliably predict LVSD.
Conclusions:
- Clinical diagnosis of LVSD in this population is unreliable.
- General practitioners should maintain a low threshold for referring patients on loop diuretics for echocardiography.
- Increased availability of open-access echocardiography services is necessary.
Background:
The UK National Service Framework recommends patients with suspected heart failure undergo echocardiography. Selection of patients for this investigation in primary care is difficult. It is not clear which clinical features best identify patients with left ventricular systolic dysfunction.
Aim:
Using echocardiography, to establish the accuracy of primary care diagnosis of left ventricular systolic dysfunction. To investigate the sensitivity, specificity and predictive values of clinical features in the diagnosis of left ventricular systolic dysfunction.
Study:
A cross-sectional study of 621 patients from a population prescribed loop diuretics in 7 general practices.
Method:
Clinical diagnoses were extracted from general practice records. Symptoms, clinical signs, ECG features, brain natriuretic peptide levels and echocardiographic findings were studied in a research clinic.
Results:
Left ventricular systolic dysfunction (ejection fraction <40%) was present in 50% of 621 patients prescribed loop diuretics in primary care. General practice diagnoses showed high false positive rates. Individual or combinations of clinical features did not accurately predict left ventricular systolic dysfunction.
Conclusion:
These results suggest the clinical diagnosis of left ventricular systolic dysfunction is inaccurate in this population. General practitioners should have a low threshold for referring patients prescribed loop diuretics for echocardiography. Increased open access echocardiography facilities will be needed.
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