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Assessment

1. What is acute heart failure (AHF)?

2. How does acute heart failure present?

3. Diagnosis of acute heart failure

1. What is acute heart failure (AHF)?

  • Heart failure (HF) is a syndrome that results from the structural or functional impairment of ventricular filling or ejection of blood.
  • Cardinal manifestations include dyspnea, fatigue, pulmonary and/or splanchnic congestion, peripheral edema.
  • Acute heart failure is a common condition that frequently results in poor outcomes or death.1 2
    • patients typically present to the emergency department (ED) with increased shortness of breath.
    • may be the first episode of HF (new onset) or, more frequently, be due to acute decompensation of chronic HF.
  • Diagnosis is primarily clinical assisted by selected investigations.3
Left ventricular ejection fraction (LVEF) in heart failure is classified as:
  • HF with preserved ejection fraction
(HFpEF)LVEF >50%
  • HF with mildly reduced ejection fraction
(HFmrEF)LVEF 41%-49%
  • HF with reduced ejection fraction
(HFrEF)LVEF <40%
  • HF with improved ejection fraction
(HFimpEF)compared to baseline

 

 

2. How does acute heart failure present?
There are four major clinical presentations with possible overlap:

(ADHF)
  • onset of dyspnea over days
  • pulmonary congestion, jugular venous distension, peripheral edema
  • the most common form, accounting for 50-70% of ED presentations
(aka “flash pulmonary edema”)
  • onset of dyspnea over hours
  • pulmonary congestion causes dyspnea with orthopnea, tachypnea, and hypoxia
  • caused by RV dysfunction, severe pulmonary hypertension, or severe tricuspid valve disease
  • symptoms often nonspecific: exertional dyspnea, fatigue, early satiety, symptoms of right-sided volume overload
  • physical findings include jugular venous distension, often with a prominent V wave and positive Kussmaul sign, ascites, leg edema
  • often poor outcomes
  • due to primary cardiac dysfunction that results inadequate cardiac output and life-threatening tissue hypoperfusion, which can lead to multiorgan failure and has >30% mortality
  • may be precipitated by acute events (e.g. myocardial infarction (MI), myocarditis) or acute decompensation of chronic left ventricular (LV) dysfunction
  • diagnosis is based on evidence of hypoperfusion:
    • signs: cold wet extremities, mottling, oliguria, mental confusion, narrow pulse pressure
    • blood pressure Is often low (SBP < 90mmHg) but may bepreserved by reflex vasoconstriction
    • low urine output
    • laboratory: metabolic acidosis with elevated serum lactate, creatinine, and/or liver enzymes

 

 

3. Diagnosis of acute heart failure
There are four major clinical presentations with possible overlap:

should be considered:
  • non-adherence with diet/sodium/water
  • non-adherence with or recent change in medication; chemotherapeutic agents
  • infections (pneumonia, influenza, endocarditis, myopericarditis)
  • arrhythmias (atrial fibrillation (AF), atrial flutter (AFL), bradycardia, ventricular tachycardia)
  • pulmonary embolism
  • MI, acute coronary syndrome (ACS)
  • hypertensive emergency
Tip:
Consider alternative or precipitating diagnoses for acute severe dyspnea:
  • myocardial infarction (MI)
  • pneumonia
  • pulmonary embolism
  • exacerbation of asthma/COPD
  • pericardial tamponade
  • pneumothorax
  • acute valve regurgitation
  • acute aortic syndrome
  • arrhythmias: VT, SVT, AF, AFL
focuses on:
  • worsening symptoms (dyspnea, orthopnea, paroxysmal nocturnal dyspnea)
  • recent weight gain
  • history of heart failure and echocardiography results
  • history of coronary artery disease
  • medications
focuses on impact of lung congestion:
  • agitation, somnolence, confusion
  • poor perfusion, cyanosis, diaphoresis
  • breathless speech
  • inability to lie supine
  • usually afebrile, tachypnea, low oxygen saturation, tachycardia
  • peripheral/sacral edema
  • jugular venous distension (JVD), hepatojugular reflux (HJR)
  • crackles, wheezing
  • extra heart sounds, murmurs
can rapidly assess:
  • lung congestion (pleural effusion, bilateral B-lines)
  • qualitative LV function
  • JVD
  • RV filling pressure estimation by measurement of inferior vena cava (IVC)
  • pericardial effusion
helps identify:
  • rhythm abnormalities (AF/AFL, heart block, bradycardia, ventricular tachycardia)
  • acute myocardial ischemia
  • RV, LV, or atrial hypertrophy or strain
  • myopericarditis
  • use 15-lead ECG for posterior ischemia, if shock
include hematology, chemistry, and troponin.
  • NT-proBNP strongly recommended:
    • <300 pg/ml – unlikely AHF
    • 300-900 pg/ml (age 50-75) or 300-1800 (age >75) – consider use of PRIDE HF Score
    • >900 pg/ml (age 50-75) or >1800 (age >75) – likely AHF
for cardiomegaly, lung congestion (redistribution, Kerley B lines, interstitial fluid), other conditions.
can can be helpful when the diagnosis is uncertain:4

PRIDE Acute Heart Failure Score4

PredictorScore
Interstitial edema on CXR2
Orthopnea2
Lack of fever2
On loop diuretic1
Age >75 years1
Crackles/rales on lung exam1
Lack of cough1
Elevated NT-proBNP4
  • > 450 pg/mL if age <50
  • > 900 pg/mL if age >50
Total


Likelihood of HF Total Score
Low0-5
Intermediate6-8
High9-14
Assessment

2. How does acute heart failure present?
There are four major clinical presentations with possible overlap:

(ADHF)
  • onset of dyspnea over days
  • pulmonary congestion, jugular venous distension, peripheral edema
  • the most common form, accounting for 50-70% of ED presentations
(aka “flash pulmonary edema”)
  • onset of dyspnea over days
  • pulmonary congestion, jugular venous distension, peripheral edema
  • the most common form, accounting for 50-70% of ED presentations
  • caused by RV dysfunction, severe pulmonary hypertension, or severe tricuspid valve disease
  • symptoms often nonspecific: exertional dyspnea, fatigue, early satiety, symptoms of right-sided volume overload
  • physical findings include jugular venous distension, often with a prominent V wave and positive Kussmaul sign, ascites, leg edema
  • often poor outcomes
  • due to primary cardiac dysfunction that results inadequate cardiac output and life-threatening tissue hypoperfusion, which can lead to multiorgan failure and has >30% mortality
  • may be precipitated by acute events (e.g. myocardial infarction (MI), myocarditis) or acute decompensation of chronic left ventricular (LV) dysfunction
  • diagnosis is based on evidence of hypoperfusion:
    • signs: cold wet extremities, mottling, oliguria, mental confusion, narrow pulse pressure
    • blood pressure Is often low (SBP < 90mmHg) but may bepreserved by reflex vasoconstriction
    • low urine output
    • laboratory: metabolic acidosis with elevated serum lactate, creatinine, and/or liver enzymes
Assessment

3. Diagnosis of acute heart failure
There are four major clinical presentations with possible overlap:

should be considered:
  • non-adherence with diet/sodium/water
  • non-adherence with or recent change in medication; chemotherapeutic agents
  • infections (pneumonia, influenza, endocarditis, myopericarditis)
  • arrhythmias (atrial fibrillation (AF), atrial flutter (AFL), bradycardia, ventricular tachycardia)
  • pulmonary embolism
  • MI, acute coronary syndrome (ACS)
  • hypertensive emergency
Tip:
Consider alternative or precipitating diagnoses for acute severe dyspnea:
  • myocardial infarction (MI)
  • pneumonia
  • pulmonary embolism
  • exacerbation of asthma/COPD
  • pericardial tamponade
  • pneumothorax
  • acute valve regurgitation
  • acute aortic syndrome
  • arrhythmias: VT, SVT, AF, AFL
focuses on:
  • worsening symptoms (dyspnea, orthopnea, paroxysmal nocturnal dyspnea)
  • recent weight gain
  • history of heart failure and echocardiography results
  • history of coronary artery disease
  • medications
focuses on impact of lung congestion:
  • agitation, somnolence, confusion
  • poor perfusion, cyanosis, diaphoresis
  • breathless speech
  • inability to lie supine
  • usually afebrile, tachypnea, low oxygen saturation, tachycardia
  • peripheral/sacral edema
  • jugular venous distension (JVD), hepatojugular reflux (HJR)
  • crackles, wheezing
  • extra heart sounds, murmurs
can rapidly assess:
  • lung congestion (pleural effusion, bilateral B-lines)
  • qualitative LV function
  • JVD
  • RV filling pressure estimation by measurement of inferior vena cava (IVC)
  • pericardial effusion
helps identify:
  • rhythm abnormalities (AF/AFL, heart block, bradycardia, ventricular tachycardia)
  • acute myocardial ischemia
  • RV, LV, or atrial hypertrophy or strain
  • myopericarditis
  • use 15-lead ECG for posterior ischemia, if shock
include hematology, chemistry, and troponin.
  • NT-proBNP strongly recommended:
    • <300 pg/ml – unlikely AHF
    • 300-900 pg/ml (age 50-75) or 300-1800 (age >75) – consider use of PRIDE HF Score
    • >900 pg/ml (age 50-75) or >1800 (age >75) – likely AHF
for cardiomegaly, lung congestion (redistribution, Kerley B lines, interstitial fluid), other conditions.
can can be helpful when the diagnosis is uncertain:4

PRIDE Acute Heart Failure Score4

PredictorScore
Interstitial edema on CXR2
Orthopnea2
Lack of fever2
On loop diuretic1
Age >75 years1
Crackles/rales on lung exam1
Lack of cough1
Elevated NT-proBNP4
  • > 450 pg/mL if age <50
  • > 900 pg/mL if age >50
Total


Likelihood of HF Total Score
Low0-5
Intermediate6-8
High9-14
Treatment

  • Treat underlying causes:
    • infections, arrhythmias, pulmonary embolism, ACS, hypertension.
  • Oxygen should be used cautiously in patients with normal oxygen saturation because of concerns of increasing systemic vascular resistance and reducing cardiac output.
    • give oxygen for patients who are hypoxemic, titrated to an oxygen saturation >90%.
  • Noninvasive ventilation (NIV) through BiPAP or CPAP should be considered for patients with a high respiratory rate (>25 breaths/min), respiratory fatigue, and persistent hypoxemia despite high-flow oxygen.
    • routine use of NIV is not advisable due to risk of worsening right HF, hypercapnia, aspiration, and pneumothorax.
    • NIV may be useful in hemodialysis patients with acute HF.
  • Endotracheal intubation should be used if less invasive modes of oxygen delivery and ventilation support fail.
    • order blood gases if ventilatory fatigue a concern.
  • IV diuretics remain the mainstay of therapy and should be administered as early as possible.
    • use bolus administration as no advantage to continuous infusion.5
    • start with an initial IV dose of furosemide:
      • if patient already taking diuretics, give 1-2 times the daily oral dose as the initial IV dose.
      • if patient not on oral diuretics, suggest:
        • 20 mg furosemide for eGFR >60
        • 40 mg furosemide for eGFR 30-60
        • 60-80 mg furosemide for eGFR <30
      • assess for satisfactory diuretic response:
        • urine output >100-150 mL/h during the first 6 hours.
        • urine sodium content >50-70 mEq/L at 2 hours.
    • if insufficient diuretic response: confirm diagnosis of AHF and then double the IV diuretic dose.
    • if response remains suboptimal patient may be in normotensive cardiogenic shock.
  • IV morphine should not be used as it increases morbidity and mortality.
  • Vasodilators and inotropic agents should only be used in selected patients (e.g. pulmonary edema, cardiogenic shock) as they do not improve outcomes in most patients.
  • Beta-blockers and calcium-channel blockers should be avoided in management of tachycardia and AF/AFL if LVEF is low or not known.
  • Three treatments should be commenced, if indicated, simultaneously:
    1. Oxygen should be given using NIV or high-flow nasal cannula.6
    2. IV diuretics remain the mainstay of therapy and should be administered as early as possible.
      • use bolus administration as no advantage to continuous infusion.5
      • start with an initial IV dose of furosemide:
        • if patient already taking diuretics, give 1-2 times the daily oral dose as the initial IV dose.
        • if patient not on oral diuretics, suggest:
          • 20 mg furosemide for eGFR >60
          • 40 mg furosemide for eGFR 30-60
          • 60-80 mg furosemide for eGFR <30
        • assess for satisfactory diuretic response:
          • urine output >100-150 mL/h during the first 6 hours.
          • urine sodium content >50-70 mEq/L at 2 hours.
      • if insufficient diuretic response: confirm diagnosis of AHF and then double the IV diuretic dose.
      • if response remains suboptimal patient may be in normotensive cardiogenic shock.
    3. Nitroglycerin should be given if systolic BP (SBP) >100 mmHg, to reduce LV afterload.
      • consider immediate sublingual nitroglycerin spray (1-2 sprays at 400 μg/spray) followed by IV.
      • give IV nitroglycerin in an initial dose of 5 to 10 μ g/min increase by 5 to 10 μg/min every 3-5 minutes as required and tolerated (dose range 10 to 200 μg/min).
      • high-dose nitrates may be considered if SBP ≥ 160 mmHg:7 8
        • start at 100 μg/min and rapidly titrate as tolerated to 200 μg/min (maximum 400 μg/min).
        • decrease dose as dyspnea and SBP improve.
      • IV nitroprusside may be used by experienced physicians.
  • Rule out ACS with RV involvement or pulmonary embolism.
  • Diuretics are the main therapy for venous congestion.
  • Involve cardiology early if the patient has severe pulmonary hypertension or fails to respond to diuretics.
  • Consult cardiology/critical care urgently.
  • Identify and treat underlying causes:
    • if ACS, consider percutaneous coronary intervention (PCI).
    • if tamponade, consider pericardiocentesis.
    • if papillary muscle rupture, consider surgery.
    • other (acute valve regurgitation, pulmonary embolism, infection, myocarditis, arrhythmia).
  • Provide oxygen and consider ventilatory support.
    • if intubation is needed, choose a sedative agent with caution – consider ketamine or etomidate.
    • for ongoing sedation, consider IV midazolam and fentanyl and avoid propofol.
  • Consider inotropes/vasopressors:9
    Weight in Kilograms
    • norepinephrine (first line)
    0.05 ug/min
    • dobutamine
    2-10 ug/min
    • milrinone
    0.25-0.75 ug/min

    • norepinephrine is first line: start at 0.05 ug/kg/min and titrate up
    • dobutamine 2-10 ug/kg/min
    • milrinone 0.25-0.75 ug/kg/min
  • Consider expert consultation for mechanical circulatory support (percutaneous LV assist devices or ECMO).
Disposition and Follow-up

  • Disposition decision to admit or discharge from the ED is complex.
    • >50% of ED acute HF patients are admitted in Canada.
  • Use shared decision making with patient and family.
    NYHA ClassDefinition
    INo symptoms
    IISymptoms with ordinary activity
    IIISymptoms with less than ordinary activity
    IVSymptoms at rest or with minimal activity
  • Factors to consider:
    • clinical classification NYHA I or II at baseline
    • not a new diagnosis of heart failure
    • response to ED treatment: good diuresis, improved dyspnea approaching patient’s baseline
    • acceptable vital signs at rest after treatment: SpO2 > 92%, SBP >100mmHg, HR <90bpm, RR <20 breaths per minute
    • ability to walk (or baseline level of mobility) without tachycardia, tachypnea, or hypoxia
    • ECG shows no ischemia or ventricular arrythmia; any atrial arrythmia has been controlled
    • creatinine at baseline after treatment
    • troponin not indicative of ACS
    • no comorbid conditions that independently require admission (e.g. syncope, pneumonia)
    • opportunity to optimize medications – see below
    • availability of early follow-up (<7 days) with clinician
    • home support is adequate
  • The HEARTRISK6 Scale is a concise and sensitive risk tool comprised of 6 simple variables that estimates the risk of poor outcomes.
  • The scale was developed from prospectively collected data from 2,246 Canadian ED patients.
  • Physicians may consider incorporating the scale’s information when making disposition decisions.
  • Medium- and high-risk patients should likely be admitted.

HEARTRISK6 Acute Heart Failure Risk Scale

Points
1. Initial Assessment
a.History of valvular heart disease1 1
b.Heart Rate:
i. HR > 100bpm to <120 bpm2
ii. HR >120 bpm 3
c.Treated with non-invasive ventilation2 2
2. Investigations
a.Creatinine:
i. >150 umol/L to <300 umol/L 2
ii. > 300 umol/L 3
b.Troponin:
i. > 3x or 4x upper limit of normal1
ii. >5x upper limit of normal
(initial or repeat, local hospital assay)
2
3. Falls Reassessment after ED Treatment (2-6 hours)
a.Resting vital signs abnormal
(SpO2 <90% on RA or usual O2, or HR > 110, or RR >28)
1
  OR  
b.Unable to start or complete 3-minute walk test
(vital signs become abnormal during walk)3
1
 
TOTAL

1moderate or severe valvular heart disease
2BiPAP within one hour of initial assessment
3score if patient SpO2 <90%, HR >110, RR >28 during walk test, or if unable to complete due to fatigue or dyspnea
*no patient scored > 11

  • Diuretics should be started or increased in patients presenting with volume overload.
    • consider a temporary increase of 2x current dose for 5- 10 days.
    • a typical starting dose is furosemide 20 mg once or twice daily, but should be based on IV diuretic requirements.
    • electrolytes and creatinine checked within 7 days.
    • for new prescriptions, provide at least 1 month supply.
  • Guideline-directed medical therapy (GDMT) medications should be continued.
  • Other medications may be prescribed by consultants:
    • angiotensin-converting enzyme (ACE) Inhibitors/angiotensin-receptor blockers (ARB), or angiotensin neprilysin inhibitors (ARNI) could be considered in patients with SBP>100 mmHg, with stable renal function, and in whom follow-up laboratory testing can be arranged.
    • mineralocorticoid receptor antagonists (MRA) could be considered in patients with stable renal function and in whom follow-up testing for hyperkalemia can be arranged.
    • in patients on beta-blockers, continuation of therapy is safe.
      • decisions to start or increase dose should consider the potential benefits and harms.
  • Sodium-glucose cotransporter-2 (SGLT2) inhibitors may be continued if stable renal function.
  • Patients discharged home from the ED should ideally be seen within 7 days by their primary care practitioner or by a new referral to primary care/internist/cardiologist/HF clinic.
  • Provide written instructions of diagnosis, results, medications, follow-up.
  • Instruct patient to return to the ED if symptoms worsen.
  • Consider expert consultation for mechanical circulatory support (percutaneous LV assist devices or ECMO).

Discharge Instructions
You were treated on at the emergency department of Hospital for acute heart failure. Acute heart failure results from weakness of the heart muscle and causes shortness of breath due to fluid in the lungs.

The following medication changes have been recommended:

Please seek medical follow-up within 7 days at (primary care practitioner, internist/cardiologist, hospital clinic). Please return to the emergency department immediately if you become short of breath or develop chest pain.

Other recommendations:
  • Weigh yourself and measure blood pressure and heart rate daily.
  • Adhere to low salt diet (sodium <2 gram/day, e.g. 1tsp salt) and restrict fluids (< 2 Litres/day).
  • Obtain immunization for influenza, RSV and pneumonia, if not already done.
  • If a smoker, consider a smoking cessation program.
  • Consider the HeartLife toolkit https://heartlife.ca/document/heartlife-toolkit/




CAEP Acute Heart Failure Checklist

Cardiogenic ShockAcute Pulmonary Edema Acute Decompensated HF

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