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Episode 221: High-Output Heart Failure

Episode 221: High-Output Heart Failure

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 We discuss the diagnosis and treatment of one of EM's paradoxes: High-Output Heart Failure. Hosts: Nicolas Gonzalez, MD Brian Gilberti, MD https://media.blubrry.com/coreem/content.blubrry.com/coreem/HOHF.mp3 Download Leave a Comment Tags: Cardiology Show Notes Core EM Modular CME Course Maximize your commute with the new Core EM Modular CME Course, featuring the most essential content distilled from our top-rated podcast episodes. This course offers 12 audio-based modules packed with pearls! Information and link below. Course Highlights: Credit: 12.5 AMA PRA Category 1 Credits™Curriculum: Comprehensive coverage of Core Emergency Medicine, with 12 modules spanning from Critical Care to Pediatrics.Cost: Free for NYU Learners$250 for Non-NYU Learners Click Here to Register and Begin Module 1 1. Core Definition & Hemodynamic Profile Clinical Paradox: Congestive symptoms (pulmonary edema, JVD, peripheral edema) in the setting of a hyperdynamic, supranormal cardiac function. Hemodynamic Criteria: Cardiac Index (CI): >4.0 L/min/m2. Cardiac Output (CO): >8 L/min. Systemic Vascular Resistance (SVR): Pathologically low (vasodilated or shunted state). The “Warm” Phenotype: Unlike standard HFrEF/HFpEF (often “Cold and Wet”), HOHF presents as “Warm and Wet” due to low SVR and bounding pulses. 2. Pathophysiology: The Hemodynamic Paradox Primary Insult: Decreased SVR (either via peripheral vasodilation or arteriovenous shunting). Effective Arterial Blood Volume: Paradoxically low despite high total CO. Neurohormonal Cascade: Activation of Renin-Angiotensin-Aldosterone System (RAAS). Increased Sympathetic Nervous System tone. Increased Antidiuretic Hormone (ADH) secretion. Resultant State: Avid renal salt and water retention leading to massive plasma volume expansion. Cardiac Response: Chronic volume overload → eccentric remodeling → chamber dilation → eventual secondary myocardial failure/dilated cardiomyopathy. 3. Differential Diagnosis: Etiological “Buckets” Category A: Increased Metabolic Demand (Systemic) Hyperthyroidism/Thyrotoxicosis: Direct T3 effects: increased chronotropy/inotropy. Indirect effects: metabolic byproduct accumulation causing peripheral vasodilation. Myeloproliferative Disorders: High cell turnover and increased oxygen consumption drive compensatory CO increase. Sepsis (Hyperdynamic Phase): Cytokine-mediated global vasodilation. Note: Often transient; may transition to sepsis-induced myocardial depression. Category B: Peripheral Vascular Effects (Shunting/Vasodilation) Arteriovenous Fistulas (AVF) / Malformations (AVM): Most Common Cause: Iatrogenic AVF for Hemodialysis (ESRD population). Bypasses high-resistance capillary beds, dumping arterial blood directly into venous circulation. Chronic Liver Disease (Cirrhosis): Formation of “spider angiomata” and internal AV shunts. Impaired clearance of endogenous vasodilators (e.g., Nitric Oxide). Thiamine Deficiency (Wet Beriberi): Accumulation of pyruvate/lactate → systemic vasodilation. Histopathology: Vacuolation, myofiber hypertrophy, and interstitial edema. Chronic Lung Disease: Hypoxia/Hypercapnia-driven systemic vasodilation. Concomitant pulmonary HTN (RV remodeling) but preserved/high LV output. Others: Paget’s disease of bone (extensive micro-shunting), Carcinoid syndrome, Mitochondrial diseases, Acromegaly, Erythroderma. 4. Special Focus: Hemodialysis Access-Induced HOHF Physiologic Phases of AVF Creation: Acute Phase: Immediate ↓ SVR. ↑ Stroke volume and Heart Rate (SNS-mediated). Endothelial shear stress → Nitric Oxide release → further arterial dilation. Subacute Phase (Days to 2 Weeks): RAAS-driven volume expansion. ↑ Right Atrial, Pulmonary Artery, and LV End-Diastolic Pressures (LVEDP). Natriuretic peptide surge (BNP/ANP) peaks around Day 10. Chronic Phase (Weeks to Months): Adaptive hypertrophy. Decompensation occurs when dilation exceeds contractility limits. 5. Point-of-Care Physical Exam & Maneuvers Nicoladoni-Branham Sign (Pathognomonic for Shunt-driven HOHF): Maneuver: Manually compress the AVF (or inflate cuff to >50 mmHg above SBP) for 30 seconds. Positive Result: Reflexive bradycardia or a transient rise in systemic BP. Significance: Confirms the shunt is a major contributor to the cardiac workload. Peripheral Pulse Assessment: Water Hammer Pulses: Rapid upstroke and collapse. Quincke’s Pulse: Visible capillary pulsations in the nail beds. Traube’s Sign: “Pistol-shot” sounds auscultated over the femoral arteries. Volume Status: Rales, S3 gallop, peripheral edema (standard HF signs). 6. Diagnostic Workup (Technical Targets) POCUS / Echocardiography: Left Ventricle: Hyperdynamic function; EF typically >60%. Left Atrium: Significant dilation (Left Atrial Volume Index >34 mL/m2; Case study noted 72 mL/m2). IVC: Plethoric with minimal respiratory variation. Doppler: High ...
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