IBCC Episode 113 - Sodium Channel Blocker Toxicity | The Internet Book of Critical Care Podcast

The podcast addresses sodium channel blockade, particularly in the context of tricyclic antidepressant (TCA) overdose, emphasizing a broader understanding of sodium channel blockers beyond just TCAs. Listeners learn how drugs with class 1A or 1C activity slow cardiomyocyte depolarization, leading to a widened QRS complex on an EKG. The discussion covers a range of drugs beyond TCAs that can cause clinically relevant sodium channel blockade, including certain antidepressants, antiarrhythmics, muscle relaxants, and antihistamines. The EKG is highlighted as the cornerstone for diagnosis, with terminal right axis deviation, a tall R-wave in AVR, and a deep S-wave in lead I being key indicators. Management strategies include hypertonic bicarbonate, lidocaine, and intralipid, especially in cases of QRS widening, seizures, or ventricular arrhythmias.

Outlines

Part 1: Pathophysiology, EKG Basics

Part 2: Primary Treatment, Bicarbonate Therapy

Part 3: Advanced Interventions, Rescue Therapies

Part 4: Critical Care, Complication Management

Part 5: Summary, Key Takeaways

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IBCC Episode 113 - Sodium Channel Blocker Toxicity

The Internet Book of Critical Care Podcast

Part 1: Pathophysiology, EKG Basics

Tricyclic Antidepressants and Sodium Channel Blockade: An Overview

Sodium Channel Blockers: EKG Changes, Complicating Factors, and Clinical Presentation

Drugs Causing Clinically Relevant Sodium Channel Blockade: A Comprehensive List

EKG as the Cornerstone of Toxicology: Recognizing Sodium Channel Blockade

Part 2: Primary Treatment, Bicarbonate Therapy

EKG Features, Clinical Manifestations, and Treatment Overview

Bicarbonate Therapy: Indications, Administration, and Complications

Bicarbonate Infusion Strategies and Electrolyte Management

Part 3: Advanced Interventions, Rescue Therapies

Second-Line Treatment: Lidocaine for Sodium Channel Blockade

Third-Line Treatment: Lipid Emulsion for Severe Intoxication

Part 4: Critical Care, Complication Management

General Critical Care: Airway, Breathing, and Circulation Management

Activated Charcoal, Hypotension, and Tachycardia Management

Ventricular Tachycardia and Seizure Management

Part 5: Summary, Key Takeaways

Key Takeaways: Diagnosis, Aggressive Treatment, and Resuscitation

IBCC Episode 113 - Sodium Channel Blocker Toxicity

The Internet Book of Critical Care Podcast

Part 1: Pathophysiology, EKG Basics

00:05Tricyclic Antidepressants and Sodium Channel Blockade: An Overview

Tricyclic Antidepressants and Sodium Channel Blockade: An Overview

01:17Sodium Channel Blockers: EKG Changes, Complicating Factors, and Clinical Presentation

Sodium Channel Blockers: EKG Changes, Complicating Factors, and Clinical Presentation

03:45Drugs Causing Clinically Relevant Sodium Channel Blockade: A Comprehensive List

Drugs Causing Clinically Relevant Sodium Channel Blockade: A Comprehensive List

06:10EKG as the Cornerstone of Toxicology: Recognizing Sodium Channel Blockade

EKG as the Cornerstone of Toxicology: Recognizing Sodium Channel Blockade

Part 2: Primary Treatment, Bicarbonate Therapy

10:11EKG Features, Clinical Manifestations, and Treatment Overview

EKG Features, Clinical Manifestations, and Treatment Overview

12:20Bicarbonate Therapy: Indications, Administration, and Complications

Bicarbonate Therapy: Indications, Administration, and Complications

15:26Bicarbonate Infusion Strategies and Electrolyte Management

Bicarbonate Infusion Strategies and Electrolyte Management

Part 3: Advanced Interventions, Rescue Therapies

17:45Second-Line Treatment: Lidocaine for Sodium Channel Blockade

Second-Line Treatment: Lidocaine for Sodium Channel Blockade

19:28Third-Line Treatment: Lipid Emulsion for Severe Intoxication

Third-Line Treatment: Lipid Emulsion for Severe Intoxication

Part 4: Critical Care, Complication Management

22:25General Critical Care: Airway, Breathing, and Circulation Management

General Critical Care: Airway, Breathing, and Circulation Management

24:28Activated Charcoal, Hypotension, and Tachycardia Management

Activated Charcoal, Hypotension, and Tachycardia Management

27:04Ventricular Tachycardia and Seizure Management

Ventricular Tachycardia and Seizure Management

Part 5: Summary, Key Takeaways

29:22Key Takeaways: Diagnosis, Aggressive Treatment, and Resuscitation

Key Takeaways: Diagnosis, Aggressive Treatment, and Resuscitation