Diagnosis and Evaluation of Heart Failure



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Heart failure is a common clinical syndrome characterized by dyspnea, fatigue, and signs of volume overload, which may include peripheral edema and pulmonary rales. Heart failure has high morbidity and mortality rates, especially in older persons. Many conditions, such as coronary artery disease, hypertension, valvular heart disease, and diabetes mellitus, can cause or lead to decompensation of chronic heart failure. Up to 40 to 50 percent of patients with heart failure have diastolic heart failure with preserved left ventricular function, and the overall mortality is similar to that of systolic heart failure. The initial evaluation includes a history and physical examination, chest radiography, electrocardiography, and laboratory assessment to identify causes or precipitating factors. A displaced cardiac apex, a third heart sound, and chest radiography findings of venous congestion or interstitial edema are useful in identifying heart failure. Systolic heart failure is unlikely when the Framingham criteria are not met or when B-type natriuretic peptide level is normal. Echocardiography is the diagnostic standard to confirm systolic or diastolic heart failure through assessment of left ventricular ejection fraction. Evaluation for ischemic heart disease is warranted in patients with heart failure, especially if angina is present, given that coronary artery disease is the most common cause of heart failure.

Heart failure is a common clinical syndrome characterized by dyspnea, fatigue, and signs of volume overload, which may include peripheral edema and pulmonary rales. There is no single diagnostic test for heart failure; therefore, it remains a clinical diagnosis requiring a history, physical examination, and laboratory testing. Symptoms of heart failure can be caused by systolic or diastolic dysfunction. Appropriate diagnosis and therapy for heart failure are important given the poor prognosis. Survival is 89.6 percent at one month from diagnosis, 78 percent at one year, and only 57.7 percent at five years.1

Heart failure has an estimated overall prevalence of 2.6 percent.2 It is becoming more common in adults older than 65 years because of increased survival after acute myocardial infarction and improved treatment of coronary artery disease (CAD), valvular disease, and hypertension.

SORT: KEY RECOMMENDATIONS FOR PRACTICE

Clinical recommendation Evidence rating References

The initial evaluation of patients with suspected heart failure should include a history and physical examination, laboratory assessment, chest radiography, and electrocardiography. Echocardiography can confirm the diagnosis.

C

3

A displaced cardiac apex, a third heart sound, and chest radiography findings of pulmonary venous congestion or interstitial edema are good predictors to rule in the diagnosis of heart failure.

C

21, 23

Systolic heart failure can be effectively ruled out with a normal B-type natriuretic peptide or N-terminal pro–B-type natriuretic peptide level.

C

2123, 25, 27, 28

Systolic heart failure can be effectively ruled out when the Framingham criteria are not met.

C

17, 29


A = consistent, good-quality patient-oriented evidence; B = inconsistent or limited-quality patient-oriented evidence; C = consensus, disease-oriented evidence, usual practice, expert opinion, or case series. For information about the SORT evidence rating system, go to http://www.aafp.org/afpsort.xml.

SORT: KEY RECOMMENDATIONS FOR PRACTICE

View Table

SORT: KEY RECOMMENDATIONS FOR PRACTICE

Clinical recommendation Evidence rating References

The initial evaluation of patients with suspected heart failure should include a history and physical examination, laboratory assessment, chest radiography, and electrocardiography. Echocardiography can confirm the diagnosis.

C

3

A displaced cardiac apex, a third heart sound, and chest radiography findings of pulmonary venous congestion or interstitial edema are good predictors to rule in the diagnosis of heart failure.

C

21, 23

Systolic heart failure can be effectively ruled out with a normal B-type natriuretic peptide or N-terminal pro–B-type natriuretic peptide level.

C

2123, 25, 27, 28

Systolic heart failure can be effectively ruled out when the Framingham criteria are not met.

C

17, 29


A = consistent, good-quality patient-oriented evidence; B = inconsistent or limited-quality patient-oriented evidence; C = consensus, disease-oriented evidence, usual practice, expert opinion, or case series. For information about the SORT evidence rating system, go to http://www.aafp.org/afpsort.xml.

Causes

Heart failure is defined by the American Heart Association and American College of Cardiology as “a complex clinical syndrome that can result from any structural or functional cardiac disorder that impairs the ability of the ventricle to fill with or eject blood.”3 As cardiac output decreases because of stresses placed on the myocardium, activation of the sympathetic nervous and renin-angiotensin-aldosterone systems increases blood pressure (for tissue perfusion) and blood volume (enhancing preload, stroke volume, and cardiac output by the Frank-Starling mechanism). These compensatory mechanisms can also lead to further myocardial deterioration and worsening myocardial contractility. In systolic heart failure, cardiac output is decreased directly through reduced left ventricular function. In diastolic heart failure, cardiac output is compromised by poor ventricular compliance, impaired relaxation, and worsened end-diastolic pressure.3,4

CAD is the underlying etiology in up to 60 to 70 percent of patients with systolic heart failure,5,6 and a predictor for progression from asymptomatic to symptomatic left ventricular systolic dysfunction. Hypertension and valvular heart disease are significant risk factors for heart failure, with relative risks of 1.4 and 1.46, respectively.6 Diabetes mellitus increases the risk of heart failure twofold by directly leading to cardiomyopathy and significantly contributing to CAD. Diabetes is one of the strongest risk factors for heart failure in women with CAD.7 Smoking, physical inactivity, obesity, and lower socioeconomic status are often overlooked risk factors.6  Numerous conditions can cause heart failure, either acutely without an underlying cardiac disorder or through decompensation of chronic heart failure (Table 1).3,4,8 As a result, alternative causes should be promptly recognized, treated, and monitored to determine if the heart failure is reversible.8

Table 1.

Causes of Heart Failure, Volume Overload, and Heart Failure Decompensation

Heart failure

Common

Coronary artery disease

Hypertension

Idiopathic cardiomyopathy

Valvular heart disease

Less common

Arrhythmia (e.g., tachycardia, bradycardia, heart block)

Collagen vascular disease (e.g., systemic lupus erythematosus, scleroderma)

Endocrine/metabolic disorders (e.g., thyroid disease, diabetes mellitus, pheochromocytoma, other genetic disorders)

Hypertrophic cardiomyopathy

Myocarditis

Pericarditis

Postpartum cardiomyopathy

Restrictive cardiomyopathies (e.g., amyloidosis, hemochromatosis, sarcoidosis, other genetic disorders)

Toxic cardiomyopathy (e.g., alcohol, cocaine, radiation)

Volume overload or heart failure decompensation

Anemia

Atrial fibrillation or other arrhythmias

Fluid overload (e.g., salt intake, water intake, medication compliance)

Fluid retention from drugs (e.g., chemotherapy, cyclooxygenase 1 and 2 inhibitors, excessive licorice, glitazones, glucocorticoids, androgens, estrogens)

Hyper- or hypothyroid disease

Pulmonary causes (e.g., cor pulmonale, pulmonary hypertension, pulmonary embolism)

Renal causes (e.g., renal failure, nephrotic syndrome, glomerulonephritis)

Sleep apnea

Systemic infection or septic shock


Information from references 3, 4, and 8.

Table 1.   Causes of Heart Failure, Volume Overload, and Heart Failure Decompensation

View Table

Table 1.

Causes of Heart Failure, Volume Overload, and Heart Failure Decompensation

Heart failure

Common

Coronary artery disease

Hypertension

Idiopathic cardiomyopathy

Valvular heart disease

Less common

Arrhythmia (e.g., tachycardia, bradycardia, heart block)

Collagen vascular disease (e.g., systemic lupus erythematosus, scleroderma)

Endocrine/metabolic disorders (e.g., thyroid disease, diabetes mellitus, pheochromocytoma, other genetic disorders)

Hypertrophic cardiomyopathy

Myocarditis

Pericarditis

Postpartum cardiomyopathy

Restrictive cardiomyopathies (e.g., amyloidosis, hemochromatosis, sarcoidosis, other genetic disorders)

Toxic cardiomyopathy (e.g., alcohol, cocaine, radiation)

Volume overload or heart failure decompensation

Anemia

Atrial fibrillation or other arrhythmias

Fluid overload (e.g., salt intake, water intake, medication compliance)

Fluid retention from drugs (e.g., chemotherapy, cyclooxygenase 1 and 2 inhibitors, excessive licorice, glitazones, glucocorticoids, androgens, estrogens)

Hyper- or hypothyroid disease

Pulmonary causes (e.g., cor pulmonale, pulmonary hypertension, pulmonary embolism)

Renal causes (e.g., renal failure, nephrotic syndrome, glomerulonephritis)

Sleep apnea

Systemic infection or septic shock


Information from references 3, 4, and 8.

Classification

The most important consideration when categorizing heart failure is whether left ventricular ejection fraction (LVEF) is preserved or reduced (less than 50 percent).3,8 A reduced LVEF in systolic heart failure is a powerful predictor of mortality.9 As many as 40 to 50 percent of patients with heart failure have diastolic heart failure with preserved left ventricular function.2,1016 Overall, there is no difference in survival between diastolic and systolic heart failure that cannot be attributed to ejection fraction.2,1016 Patients with diastolic heart failure are more likely to be women, to be older, and to have hypertension, atrial fibrillation, and left ventricular hypertrophy, but no history of CAD.1114,17,18 Compared with systolic heart failure, which has well-validated therapies, diastolic heart failure lacks evidence-based treatment recommendations.3,8,13

Heart failure symptoms can occur with preserved or reduced ejection fraction, (systolic or diastolic heart failure). The New York Heart Association classification system is the simplest and most widely used method to gauge symptom severity (Table 2).19 The classification system is a well-established predictor of mortality and can be used at diagnosis and to monitor treatment response.

Table 2.

New York Heart Association Functional Classification of Heart Failure

Class Description

I

No limitations of physical activity

No heart failure symptoms

II

Mild limitation of physical activity

Heart failure symptoms with significant exertion; comfortable at rest or with mild activity

III

Marked limitation of physical activity

Heart failure symptoms with mild exertion; only comfortable at rest

IV

Discomfort with any activity

Heart failure symptoms occur at rest


Adapted with permission from New York Heart Association Criteria Committee. Disease of the Heart and Blood Vessels. Nomenclature and Criteria for Diagnosis. 6th ed. Boston, Mass.: Little, Brown; 1964:112–113.

Table 2.   New York Heart Association Functional Classification of Heart Failure

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Table 2.

New York Heart Association Functional Classification of Heart Failure

Class Description

I

No limitations of physical activity

No heart failure symptoms

II

Mild limitation of physical activity

Heart failure symptoms with significant exertion; comfortable at rest or with mild activity

III

Marked limitation of physical activity

Heart failure symptoms with mild exertion; only comfortable at rest

IV

Discomfort with any activity

Heart failure symptoms occur at rest


Adapted with permission from New York Heart Association Criteria Committee. Disease of the Heart and Blood Vessels. Nomenclature and Criteria for Diagnosis. 6th ed. Boston, Mass.: Little, Brown; 1964:112–113.

Initial Clinical Evaluation

Although no single item on clinical history, sign, or symptom has been proven to be diagnostic, many are helpful in assessing the probability of heart failure. The initial clinical evaluation, detailed in Tables 1,3,4,8  3,3,8,20  and 4,3,8,20  is directed at confirming heart failure, determining potential causes, and identifying comorbid illnesses. Table 5 lists findings for the initial evaluation of suspected heart failure, including history, physical examination, chest radiography, electrocardiography, and B-type natriuretic peptide (BNP) testing.17,2123 Evaluation for ischemic heart disease is warranted in patients with heart failure, especially if angina is present, given that CAD is the most common cause of heart failure.

Table 3.

History and Physical Examination Findings for Heart Failure and Selected Alternative Causes

Heart failure

Symptoms

Abdominal swelling

Dyspnea on exertion

Edema

Exercise intolerance

Fatigue

Orthopnea

Paroxysmal nocturnal dyspnea

Recent weight gain

Physical examination findings

Abdomen: hepatojugular reflux, ascites

Extremities: cool, dependent edema

Heart: bradycardia/tachycardia, laterally displaced point of maximal impulse, third heart sound (gallop or murmur)

Lungs: labored breathing, rales

Neck: elevated jugular venous pressure

Skin: cyanosis, pallor

Alternative causes

Symptoms

Abdominal swelling (liver failure)

Anorexia, weight loss (sarcoidosis)

Chest pain (coronary artery disease)

Claudication (atherosclerotic disease)

Cough (pulmonary disease)

Diarrhea or skin lesions (amyloidosis)

Dyspnea on exertion (pulmonary disease, valvular disease)

Edema (liver or kidney failure)

Neurologic problems (sarcoidosis)

Palpitations (tachyarrhythmia)

Recent fevers, viral infection (endocarditis, myocarditis, infection)

Syncope (bradycardia, heart block)

Physical examination findings

Abdomen: distended, hepatosplenomegaly, tender, ascites (liver disease)

Extremities: joint inflammation/warmth (rheumatologic disease)

Heart: irregular rate or rhythm (arrhythmia)

Lungs: wheezing (pulmonary disease)

Neck: thyromegaly/nodule (thyroid disease)

Skin: cyanosis (anemia), jaundice (liver failure)


Information from references 3, 8, and 20.

Table 3.   History and Physical Examination Findings for Heart Failure and Selected Alternative Causes

View Table

Table 3.

History and Physical Examination Findings for Heart Failure and Selected Alternative Causes

Heart failure

Symptoms

Abdominal swelling

Dyspnea on exertion

Edema

Exercise intolerance

Fatigue

Orthopnea

Paroxysmal nocturnal dyspnea

Recent weight gain

Physical examination findings

Abdomen: hepatojugular reflux, ascites

Extremities: cool, dependent edema

Heart: bradycardia/tachycardia, laterally displaced point of maximal impulse, third heart sound (gallop or murmur)

Lungs: labored breathing, rales

Neck: elevated jugular venous pressure

Skin: cyanosis, pallor

Alternative causes

Symptoms

Abdominal swelling (liver failure)

Anorexia, weight loss (sarcoidosis)

Chest pain (coronary artery disease)

Claudication (atherosclerotic disease)

Cough (pulmonary disease)

Diarrhea or skin lesions (amyloidosis)

Dyspnea on exertion (pulmonary disease, valvular disease)

Edema (liver or kidney failure)

Neurologic problems (sarcoidosis)

Palpitations (tachyarrhythmia)

Recent fevers, viral infection (endocarditis, myocarditis, infection)

Syncope (bradycardia, heart block)

Physical examination findings

Abdomen: distended, hepatosplenomegaly, tender, ascites (liver disease)

Extremities: joint inflammation/warmth (rheumatologic disease)

Heart: irregular rate or rhythm (arrhythmia)

Lungs: wheezing (pulmonary disease)

Neck: thyromegaly/nodule (thyroid disease)

Skin: cyanosis (anemia), jaundice (liver failure)


Information from references 3, 8, and 20.

Table 4.

Laboratory Evaluation for Heart Failure and Selected Alternative Causes

Initial tests

B-type natriuretic peptide level

Calcium and magnesium levels (diuretics, cause of arrhythmia)

Complete blood count (anemia)

Liver function (hepatic congestion, volume overload)

Renal function (renal causes)

Serum electrolyte level (electrolyte imbalance)

Thyroid-stimulating hormone level (thyroid disorders)

Urinalysis (renal causes)

Other tests for alternative causes

Arterial blood gases (hypoxia, pulmonary disease)

Blood cultures (endocarditis, systemic infection)

Human immunodeficiency virus (cardiomyopathy)

Lyme serology (bradycardia/heart block)

Serum ferritin level, transferrin saturation (macrocytic anemia, hemochromatosis)

Thiamine level (deficiency, beriberi, alcoholism)

Troponin and creatine kinase-MB levels (myocardial infarction, myocardial injury)

Tests for comorbid conditions, risk management

A1C level (diabetes mellitus)

Lipid profile (hyperlipidemia)


Information from references 3, 8, and 20.

Table 4.   Laboratory Evaluation for Heart Failure and Selected Alternative Causes

View Table

Table 4.

Laboratory Evaluation for Heart Failure and Selected Alternative Causes

Initial tests

B-type natriuretic peptide level

Calcium and magnesium levels (diuretics, cause of arrhythmia)

Complete blood count (anemia)

Liver function (hepatic congestion, volume overload)

Renal function (renal causes)

Serum electrolyte level (electrolyte imbalance)

Thyroid-stimulating hormone level (thyroid disorders)

Urinalysis (renal causes)

Other tests for alternative causes

Arterial blood gases (hypoxia, pulmonary disease)

Blood cultures (endocarditis, systemic infection)

Human immunodeficiency virus (cardiomyopathy)

Lyme serology (bradycardia/heart block)

Serum ferritin level, transferrin saturation (macrocytic anemia, hemochromatosis)

Thiamine level (deficiency, beriberi, alcoholism)

Troponin and creatine kinase-MB levels (myocardial infarction, myocardial injury)

Tests for comorbid conditions, risk management

A1C level (diabetes mellitus)

Lipid profile (hyperlipidemia)


Information from references 3, 8, and 20.

Table 5.

Accuracy of Initial Evaluation Findings in Diagnosing Heart Failure

Ruling in heart failure

Finding has conclusive effect

Positive likelihood ratio > 10

Specificity


Displaced cardiac apex*

16

0.95

Third heart sound

11

0.99

Chest radiography: interstitial edema

12

0.97

Chest radiography: venous congestion

12

0.96

Finding has moderate effect

Positive likelihood ratio of 5 to 10

Specificity


History of heart failure

5.8

0.90

Hepatojugular reflex

6.4

0.96

Jugular venous distension

5.1

0.92

Finding has small effect

Positive likelihood ratio of 2 to 5

Specificity


Framingham criteria for systolic heart failure

4.57

0.79

Framingham criteria for heart failure

4.35

0.79

Framingham criteria for diastolic heart failure

4.21

0.79

Initial clinical judgment

4.4

0.86

History of myocardial infarction

3.1

0.87

Rales (crackles)

2.8

0.78

Murmur

2.6

0.90

Paroxysmal nocturnal dyspnea

2.6

0.84

Peripheral edema

2.3

0.78

Orthopnea

2.2

0.77

Elevated BNP level

2.92

0.66

Elevated N-terminal pro-BNP level

2.67

0.65

Chest radiography: cardiomegaly

3.3

0.78

Chest radiography: pleural effusion

3.2

0.92

ECG: atrial fibrillation

3.8

0.93

ECG: new T-wave change

3.0

0.92

ECG: any abnormality

2.2

0.78

Ruling out heart failure

Finding has conclusive effect

Negative likelihood ratio < 0.1

Sensitivity


Framingham criteria for systolic heart failure

0.04

0.97

Finding has moderate effect

Negative likelihood ratio of 0.1 to 0.2

Sensitivity


Framingham criteria for heart failure

0.1

0.92

Framingham criteria for diastolic heart failure

0.13

0.89

Reduced BNP level

0.1

0.94

Reduced N-terminal pro-BNP level

0.14

0.92

Finding has small effect

Negative likelihood ratio of 0.2 to 0.5

Sensitivity


Dyspnea on exertion

0.48

0.84

Chest radiography: cardiomegaly

0.33

0.97

Chest radiography: venous congestion

0.48

0.96

ECG: normal*

0.27

0.84


note: Items are listed by the following groups: clinical criteria, history, physical examination, laboratory tests, chest radiography, and electrocardiography. BNP = B-type natriuretic peptide; ECG = electrocardiography.

*—Findings from research evaluating only systolic heart failure.

Information from references 17, and 21 through 23.

Table 5.   Accuracy of Initial Evaluation Findings in Diagnosing Heart Failure

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Table 5.

Accuracy of Initial Evaluation Findings in Diagnosing Heart Failure

Ruling in heart failure

Finding has conclusive effect

Positive likelihood ratio > 10

Specificity


Displaced cardiac apex*

16

0.95

Third heart sound

11

0.99

Chest radiography: interstitial edema

12

0.97

Chest radiography: venous congestion

12

0.96

Finding has moderate effect

Positive likelihood ratio of 5 to 10

Specificity


History of heart failure

5.8

0.90

Hepatojugular reflex

6.4

0.96

Jugular venous distension

5.1

0.92

Finding has small effect

Positive likelihood ratio of 2 to 5

Specificity


Framingham criteria for systolic heart failure

4.57

0.79

Framingham criteria for heart failure

4.35

0.79

Framingham criteria for diastolic heart failure

4.21

0.79

Initial clinical judgment

4.4

0.86

History of myocardial infarction

3.1

0.87

Rales (crackles)

2.8

0.78

Murmur

2.6

0.90

Paroxysmal nocturnal dyspnea

2.6

0.84

Peripheral edema

2.3

0.78

Orthopnea

2.2

0.77

Elevated BNP level

2.92

0.66

Elevated N-terminal pro-BNP level

2.67

0.65

Chest radiography: cardiomegaly

3.3

0.78

Chest radiography: pleural effusion

3.2

0.92

ECG: atrial fibrillation

3.8

0.93

ECG: new T-wave change

3.0

0.92

ECG: any abnormality

2.2

0.78

Ruling out heart failure

Finding has conclusive effect

Negative likelihood ratio < 0.1

Sensitivity


Framingham criteria for systolic heart failure

0.04

0.97

Finding has moderate effect

Negative likelihood ratio of 0.1 to 0.2

Sensitivity


Framingham criteria for heart failure

0.1

0.92

Framingham criteria for diastolic heart failure

0.13

0.89

Reduced BNP level

0.1

0.94

Reduced N-terminal pro-BNP level

0.14

0.92

Finding has small effect

Negative likelihood ratio of 0.2 to 0.5

Sensitivity


Dyspnea on exertion

0.48

0.84

Chest radiography: cardiomegaly

0.33

0.97

Chest radiography: venous congestion

0.48

0.96

ECG: normal*

0.27

0.84


note: Items are listed by the following groups: clinical criteria, history, physical examination, laboratory tests, chest radiography, and electrocardiography. BNP = B-type natriuretic peptide; ECG = electrocardiography.

*—Findings from research evaluating only systolic heart failure.

Information from references 17, and 21 through 23.

History and Physical Examination

Patients with heart failure can have decreased exercise tolerance with dyspnea, fatigue, generalized weakness, and fluid retention, with peripheral or abdominal swelling and possibly orthopnea.3  Patient history and physical examination are useful to evaluate for alternative or reversible causes (Table 1).3,4,8 Nearly all patients with heart failure have dyspnea on exertion. However, heart failure accounts for only 30 percent of the causes of dyspnea in the primary care setting.24 The absence of dyspnea on exertion only slightly decreases the probability of systolic heart failure, and the presence of orthopnea or paroxysmal nocturnal dyspnea has a small effect in increasing the probability of heart failure (positive likelihood ratio [LR+] = 2.2 and 2.6).21,23

The presence of a third heart sound (ventricular filling gallop) is an indication of increased left ventricular end-diastolic pressure and a decreased LVEF. Despite being relatively uncommon findings, a third heart sound and displaced cardiac apex are good predictors of left ventricular dysfunction and effectively rule in the diagnosis of systolic heart failure (LR+ = 11 and 16).21,23

The presence of jugular venous distention, hepatojugular reflux, pulmonary rales, and pitting peripheral edema is indicative of volume overload and enhances the probability of a heart failure diagnosis. Jugular venous distention and hepatojugular reflex have a moderate effect (LR+ = 5.1 and 6.4), whereas the others, along with cardiac murmurs, have only a small effect on the diagnostic probability (LR+ = 2.3 to 2.8). The absence of any of these findings is of little help in ruling out heart failure.21

Laboratory Tests

Laboratory testing can help identify alternative and potentially reversible causes of heart failure. Table 4 lists laboratory tests appropriate for the initial evaluation of heart failure and other potential causes.3,8,20 Other laboratory tests should be performed based on physician discretion to evaluate further causes or identify comorbid conditions that require enhanced control.

BNP and N-terminal pro-BNP (the cleaved inactive N-terminal fragment of the BNP precursor) levels can be used to evaluate patients with dyspnea for heart failure. BNP is secreted by the atria and ventricles in response to stretching or increased wall tension.25 BNP levels increase with age, are higher in women and blacks, and can be elevated in patients with renal failure.21,26 BNP appears to have better reliability than N-terminal pro-BNP, especially in older populations.25,26 Multiple systematic reviews have concluded that BNP and N-terminal pro-BNP levels can effectively rule out a diagnosis of heart failure22,25,27,28 because of their negative predictive value (negative likelihood ratio [LR–] = 0.1 and 0.14).22 The average cutoff levels for heart failure were a BNP level of 95 pg per mL (95 ng per L) or a N-terminal pro-BNP level of 642 pg per mL (642 ng per L).22

As BNP levels increase, the specificity increases and thus the likelihood of a heart failure diagnosis.25 BNP levels are strong predictors of mortality at two to three months and cardiovascular events in acute heart failure, specifically when BNP level is greater than 200 pg per mL (200 ng per L) or N-terminal pro-BNP level is greater than 5,180 pg per mL (5,180 ng per L).22,25 Limited evidence supports monitoring reduction of BNP levels in the acute and outpatient settings. A 30 to 50 percent reduction in BNP level at hospital discharge showed improved survival and reduced rehospitalization rates. Optimizing management for outpatient targets of a BNP level less than 100 pg per mL (100 ng per L) and an N-terminal pro-BNP level less than 1,700 pg per mL (1,700 ng per L) showed improvement in decompensations, hospitalizations, and mortality events.22,25

Chest Radiography

Chest radiography should be performed initially to evaluate for heart failure because it can identify pulmonary causes of dyspnea (e.g., pneumonia, pneumothorax, mass). Pulmonary venous congestion and interstitial edema on chest radiography in a patient with dyspnea make the diagnosis of heart failure more likely (LR+ = 12). Other findings, such as pleural effusion or cardiomegaly, may slightly increase the likelihood of heart failure (LR+ = 3.2 and 3.3), but their absence is only slightly useful in decreasing the probability of heart failure (LR– = 0.33 to 0.48).21

Electrocardiography

Electrocardiography (ECG) is useful for identifying other causes in patients with suspected heart failure. Changes such as left bundle branch block, left ventricular hypertrophy, acute or previous myocardial infarction, or atrial fibrillation can be identified and may warrant further investigation by echocardiography, stress testing, or cardiology consultation. Normal findings (or minor abnormalities) on ECG make systolic heart failure only slightly less likely (LR– = 0.27).23 The presence of other findings such as atrial fibrillation, new T-wave changes, or any abnormality has a small effect on the diagnostic probability of heart failure (LR+ = 2.2 to 3.8).21

Clinical Decision Making

The definition of heart failure continues to be debated, but it remains a clinical diagnosis. Several groups have published diagnostic criteria, but the Framingham criteria are widely accepted and include the components of the initial evaluation, which enhances their accuracy (Table 6).17 A previous study validated the Framingham criteria for diagnosing systolic heart failure,29 and a more recent study analyzed them for systolic and diastolic heart failure.17 Both studies reported high sensitivity for systolic heart failure (97 percent compared with 89 percent for diastolic heart failure), which effectively rules out heart failure when the Framingham criteria are not met (LR– = 0.04).17,29 The Framingham criteria only have a small effect on confirming a diagnosis of heart failure (LR+ = 4.21 to 4.57), but have a moderate effect on ruling out heart failure in general and diastolic heart failure (LR– = 0.1 and 0.13).17

Table 6.

Framingham Diagnostic Criteria for Heart Failure*

Major criteria

Acute pulmonary edema

Cardiomegaly

Hepatojugular reflex

Neck vein distension

Paroxysmal nocturnal dyspnea or orthopnea

Rales

Third heart sound gallop

Minor criteria

Ankle edema

Dyspnea on exertion

Hepatomegaly

Nocturnal cough

Pleural effusion

Tachycardia (> 120 beats per minute)


*—Heart failure is diagnosed when two major criteria or one major and two minor criteria are met.

Adapted with permission from Maestre A, Gil V, Gallego J, Aznar J, Mora A, Martin-Hidalgo A. Diagnostic accuracy of clinical criteria for identifying systolic and diastolic heart failure: cross-sectional study. J Eval Clin Pract. 2009;15(1):60.

Table 6.   Framingham Diagnostic Criteria for Heart Failure*

View Table

Table 6.

Framingham Diagnostic Criteria for Heart Failure*

Major criteria

Acute pulmonary edema

Cardiomegaly

Hepatojugular reflex

Neck vein distension

Paroxysmal nocturnal dyspnea or orthopnea

Rales

Third heart sound gallop

Minor criteria

Ankle edema

Dyspnea on exertion

Hepatomegaly

Nocturnal cough

Pleural effusion

Tachycardia (> 120 beats per minute)


*—Heart failure is diagnosed when two major criteria or one major and two minor criteria are met.

Adapted with permission from Maestre A, Gil V, Gallego J, Aznar J, Mora A, Martin-Hidalgo A. Diagnostic accuracy of clinical criteria for identifying systolic and diastolic heart failure: cross-sectional study. J Eval Clin Pract. 2009;15(1):60.

Echocardiography is the most widely accepted and available method for identifying systolic dysfunction and should be performed after the initial evaluation to confirm the presence of heart failure.3 Two-dimensional echocardiography with Doppler flow studies can assess LVEF, left ventricular size, wall thickness, valve function, and the pericardium. Echocardiography can assist in diagnosing diastolic heart failure if elevated left atrial pressure, impaired left ventricular relaxation, and decreased compliance are present.2,3 Often, the diagnosis of diastolic heart failure is clinical without conclusive echocardiographic evidence. If echocardiography results are equivocal or inadequate, transesophageal echocardiography, radionuclide angiography, or cineangiography with contrast media (at catheterization) can be used to assess cardiac function.30

If angina or chest pain is present with heart failure, the American Heart Association and the American College of Cardiology recommend that the patient undergo coronary angiography, unless there is a contraindication to potential revascularization.3 Coronary angiography has been shown to improve symptoms and survival in patients with angina and reduced ejection fraction.3 It is important to evaluate for CAD because it is the cause of heart failure and low ejection fraction in approximately two-thirds of patients.4,5 Because wall motion abnormalities are common in nonischemic cardiomyopathy, noninvasive testing may not be adequate for assessing the presence of CAD, and cardiology consultation may be warranted.

Figure 1 is an algorithm for the evaluation and diagnosis of heart failure. When a patient presents with symptoms of heart failure, the initial evaluation is performed to identify alternative or reversible causes of heart failure and to confirm its presence. If the Framingham criteria are not met, or if the BNP level is normal, systolic heart failure is essentially ruled out. Echocardiography should be performed to assess LVEF when heart failure is suspected or if diastolic heart failure is still suspected when systolic heart failure is ruled out. Treatment options are guided by the final diagnosis and echocardiography results, with a consideration to evaluate for CAD.

Evaluation and Diagnosis of Heart Failure

Figure 1.

Algorithm for the evaluation and diagnosis of heart failure. (BNP = B-type natriuretic peptide.)

View Large

Evaluation and Diagnosis of Heart Failure


Figure 1.

Algorithm for the evaluation and diagnosis of heart failure. (BNP = B-type natriuretic peptide.)

Evaluation and Diagnosis of Heart Failure


Figure 1.

Algorithm for the evaluation and diagnosis of heart failure. (BNP = B-type natriuretic peptide.)

Data Sources: A PubMed search was completed in Clinical Queries using the following key words in various combinations under the search by clinical study category: heart failure, symptoms, causes, diagnosis, diagnostic criteria, diastolic, systolic, brain natriuretic peptide. The categories searched included etiology, diagnosis, clinical prediction rules, and systematic reviews. The articles consisted of meta-analyses, systematic reviews, randomized controlled trials, and cohort studies. The related citations feature was used to locate similar research once appropriate articles had been discovered. We also searched the Agency for Healthcare Research and Quality Evidence Reports, Bandolier, the Cochrane Database of Systematic Reviews, the Database of Abstracts of Reviews of Effects, the Institute for Clinical Systems Improvement, and the National Guideline Clearinghouse database. Search dates: April 5 through 16, 2010; May 24 through 28, 2010; selected newer articles January 1 and April 20, 2011.

The Authors

MICHAEL KING, MD, FAAFP, is an assistant professor and the residency program director in the Department of Family and Community Medicine at the University of Kentucky College of Medicine, Lexington.

JOE KINGERY, DO, is an assistant professor at the University of Kentucky College of Medicine, and an associate residency director of the East Kentucky Family Medicine Residency Program, Hazard.

BARETTA CASEY, MD, MPH, FAAFP, is a professor and the vice chair in the Department of Family and Community Medicine at the University of Kentucky College of Medicine, and the campus director of the East Kentucky campus at the University of Kentucky Center for Rural Health, Hazard.

Address correspondence to Michael King, MD, FAAFP, University of Kentucky College of Medicine, K302 Kentucky Clinic, Lexington, KY 40536 (e-mail: mrking02@uky.edu). Reprints are not available from the authors.

Author disclosure: No relevant financial affiliations to disclose.

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