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Urgent Clinical Assessment - Acute Decompensated Heart Failure with Rapid AF

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Clinical Picture Summary

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Step-by-Step Immediate Management

1. AIRWAY & BREATHING (Immediate)

• Increase O2 delivery - move to high-flow oxygen (10-15 L/min via non-rebreather mask) to target SpO2 ≥ 95%.
• Consider NIV (CPAP or BiPAP) if SpO2 does not improve or patient shows increased work of breathing. NIV is associated with better improvement in dyspnoea, heart rate, and acidosis compared to standard O2 alone (Braunwald's Heart Disease). Contraindications: inability to protect airway, altered sensorium.
• Do NOT give morphine - associated with increased need for mechanical ventilation and higher mortality in AHF.

2. MONITORING & ACCESS

• Continuous ECG monitoring (confirm AF vs other tachyarrhythmia)
• IV access x2 (large bore)
• 12-lead ECG
• Pulse oximetry, continuous BP monitoring
• Urine output monitoring (insert urinary catheter)

3. INVESTIGATIONS (STAT - run simultaneously)

• ECG - confirm AF/RVR vs other arrhythmia
• CXR - pulmonary oedema assessment
• ABG - assess oxygenation, acid-base status
• Bloods: CBC, RFT (renal function - guides diuretic dosing), LFT, serum electrolytes (K+, Na+, Mg2+), BNP/NT-proBNP, troponin (rule out ACS as trigger), TSH/T3/T4 (thyroid status - critical given ca thyroid history), blood glucose, coagulation
• Echo (POCUS/bedside) - confirm LVEF, rule out pericardial effusion, assess volume status

4. MANAGE THE RAPID HEART RATE (Priority - 155/min)

"In patients with systolic dysfunction, intravenous digoxin (in the absence of an accessory pathway), cautious use of beta blocker therapy, or amiodarone may be used. Diltiazem and other agents that suppress ventricular function should be avoided in patients with significant systolic dysfunction."

• First choice - IV Digoxin: 0.25-0.5 mg IV loading dose (reduce dose given elderly and adjust for renal function). Safe in HFrEF with AF. Note: digoxin toxicity risk is higher in elderly - check renal function before dosing.
• Second choice - IV Amiodarone: Especially relevant here given ca thyroid history - amiodarone can worsen thyroid dysfunction, so use only if other options are inadequate or unavailable. If used: 150 mg IV over 10 min, then 1 mg/min for 6 hrs.
• Beta-blockers: Use cautiously if patient is euvolemic/compensated; avoid if in active decompensation or bronchospasm.
• Do NOT cardiovert immediately unless haemodynamically unstable (BP <80 mmHg, loss of consciousness). Cardioversion while significantly decompensated carries a high rate of recurrent AF.

5. IV DIURESIS (Core Treatment for Congestion)

• IV furosemide is the cornerstone of AHF management - given to >75% of patients in emergency settings.
• Dose: 1-2.5x the patient's usual oral loop diuretic dose IV (if on furosemide 40 mg PO daily, give 40-100 mg IV bolus).
• If not on prior diuretics: furosemide 40-80 mg IV bolus.
• Monitor urine output hourly - target >0.5 mL/kg/hr.
• Recheck electrolytes (especially K+) within 2-4 hours.

6. VASODILATOR (if BP permits and no shock)

• IV nitrates (sublingual GTN or IV GTN infusion) can be considered in patients with pulmonary oedema and adequate BP. Has been shown to reduce need for mechanical ventilation in severe cardiogenic pulmonary oedema.
• Avoid if SBP < 90 mmHg.

7. CA THYROID - SPECIFIC CONSIDERATIONS

• Thyroid storm can precipitate acute HF and AF with RVR - check TSH urgently.
• Amiodarone is relatively contraindicated in thyroid disease (can cause both hyper- and hypothyroidism).
• If the patient is on thyroid medications, review current dosing.
• Alert the oncology/endocrine team urgently.

8. ANTICOAGULATION

• New or worsening AF in a 76-year-old female with HF - calculate CHA2DS2-VASc score (this patient scores at minimum 3-4: age ≥65, female, HF).
• Start anticoagulation once bleeding risk is assessed and renal function known.

9. DISPOSITION

• ICU/HDU admission - this patient has LVEF 30%, SpO2 93%, PR 155, and is elderly. She needs close monitoring.
• Inform cardiologist + intensivist immediately.

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Summary Priority Action List

1. Escalate O2 (NRM mask) / prepare for NIV
2. IV access + stat bloods (including TSH, BNP, troponin, RFT, electrolytes)
3. 12-lead ECG + CXR + POCUS echo
4. IV furosemide (40-80 mg IV bolus)
5. Rate control: IV digoxin (preferred in HFrEF + AF)
6. Continuous monitoring, urine output via catheter
7. ICU/HDU bed
8. Cardiology + endocrine consult

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Clinical note: This is an elderly female with known malignancy (ca thyroid) and severe LV dysfunction. Thyroid storm as a precipitant of her decompensation must be actively excluded. Amiodarone should be a second-line choice given the thyroid history. Digoxin is the safer first-line rate control agent in this setting.

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⚡ ACUTE HEART FAILURE - QUICK REFERENCE GUIDE

For General Ward Doctors & Residents

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SECTION 1: RAPID HEMODYNAMIC CLASSIFICATION

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SECTION 2: IMMEDIATE ASSESSMENT (First 30 minutes)

Vitals & Quick Look

• BP, HR, RR, SpO2, GCS, urine output
• Is the patient in respiratory distress? Cardiogenic shock?

Mandatory Investigations (STAT)

Common Precipitants (FAILURE mnemonic)

• F - Forgot medications / non-compliance
• A - Arrhythmia (AF most common)
• I - Ischaemia / Infarction
• L - Lifestyle (excess salt/fluid)
• U - Uncontrolled hypertension
• R - Renal failure (cardiorenal syndrome)
• E - Embolism (PE), Endocarditis, Exacerbation (infection)

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SECTION 3: OXYGEN & RESPIRATORY SUPPORT

Do NOT give morphine - associated with increased mechanical ventilation, ICU admission, and mortality in AHF (Braunwald's Heart Disease, Chapter 49).

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SECTION 4: DIURETIC THERAPY

Furosemide Dosing (IV)

• Urine output hourly (target > 0.5 mL/kg/hr, ideally 200-300 mL/hr initially)
• Electrolytes (K+, Mg2+) at 2-4 hours - replace aggressively
• Renal function at 6-12 hours
• Weigh patient daily

Diuretic Resistance

• NSAID / COX-2 inhibitor co-prescription (avoid these)
• Delayed gut absorption (solved by IV route)
• Excessive dietary sodium intake
• Worsening renal perfusion

The DOSE trial showed no significant difference between IV bolus and IV infusion strategies for diuresis in AHF (Braunwald's Heart Disease).

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SECTION 5: VASODILATOR THERAPY

• Early IV nitrate in severe cardiogenic pulmonary oedema reduces need for mechanical ventilation and MI frequency.
• Avoid vasodilators if: SBP < 90 mmHg, severe aortic stenosis, known HOCM.

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SECTION 6: RATE CONTROL PROTOCOL (AF with Rapid Ventricular Response)

Step 1: Is the patient haemodynamically unstable?

SBP < 80 mmHg, loss of consciousness, acute ischaemia despite resuscitation

• YES → Immediate DC cardioversion (synchronised, after anticoagulation if possible)
• NO → Pharmacological rate control (see below)

Note: Do NOT cardiovert a significantly decompensated patient routinely - high rate of recurrent AF while decompensated.

Step 2: What is the LVEF?

LVEF < 40% (HFrEF) - Use these agents:

Avoid diltiazem, verapamil in LVEF < 40% - they suppress ventricular function and worsen HF.

LVEF ≥ 40% (HFpEF) - Additional agents can be used:

Step 3: Rate Control Targets

• Acute setting: Resting HR < 110 bpm (lenient) is acceptable initially
• Once stable: Target HR 60-80 bpm at rest (strict control)
• Rate control and rhythm control have equivalent long-term outcomes in HFrEF + chronic AF (AF-CHF trial)

Step 4: Anticoagulation (Do not delay)

• Calculate CHA2DS2-VASc score
• Most patients with HF + AF score ≥ 2 and need anticoagulation
• Start LMWH (enoxaparin) or UFH immediately, transition to DOAC once stable (unless contraindicated)

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SECTION 7: INOTROPES & VASOPRESSORS (Cold + Wet / Cardiogenic Shock)

Avoid inotropes in ACS-related AHF unless in cardiogenic shock - they can cause necrosis of ischaemic myocardium.

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SECTION 8: ADMISSION CRITERIA

• SpO2 < 90% despite high-flow O2
• SBP < 90 mmHg or cardiogenic shock
• HR > 130 despite initial treatment
• New or worsening ACS
• Need for NIV or mechanical ventilation
• Severe electrolyte disturbance
• Rapidly worsening renal function

• Congestion without hypoperfusion
• SpO2 improving with O2
• Responds to initial diuretics
• Haemodynamically stable tachycardia

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SECTION 9: AVOID THESE IN AHF

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QUICK DECISION TREE

ACUTE HF PRESENTATION
        ↓
Is patient in SHOCK? (SBP <80, altered mentation, cold/clammy)
   YES → Inotropes + vasopressors + ICU + invasive monitoring
   NO ↓
Is SpO2 <90%?
   YES → High-flow O2 / NIV (CPAP/BiPAP)
   NO → Maintain O2 supplementation
        ↓
WET profile? (oedema, pulmonary crackles, raised JVP)
   YES → IV Furosemide (1-2.5x oral dose)
        ↓
AF with rapid rate? (HR >110)
   LVEF <40% → IV Digoxin (first choice) or IV Amiodarone
   LVEF ≥40% → IV Diltiazem or IV Metoprolol
        ↓
BP ≥90 and pulmonary oedema?
   YES → Add IV GTN / nitrates
        ↓
All patients → Identify and treat precipitant
             → Anticoagulate if AF + CHA2DS2-VASc ≥1 (male) / ≥2 (female)
             → Check electrolytes at 2-4 hrs post-diuresis

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