Related Experiment Video

Updated: Jul 19, 2025

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
08:28

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

Published on: April 5, 2011

17.8K

Beyond Syncopal Episodes: A Complicated Hyperkalemic Emergency Manifesting As Complete Heart Block and Seizure Versus

Mukosolu F Obi1, Hyun Joon Cho1, Manjari Sharma1

  • 1Internal Medicine, Wyckoff Heights Medical Center, Brooklyn, USA.

Cureus
|August 7, 2023
PubMed

Insights

A hyperkalemic emergency in an elderly woman caused complete heart block and seizure-like activity. Differentiating these symptoms from seizures is crucial for proper treatment, with the head-upright tilt test aiding diagnosis.

Area of Science:

  • Cardiology
  • Neurology
  • Emergency Medicine

Background:

  • Hyperkalemia, a critical condition of elevated potassium levels, can manifest with severe cardiovascular and neurological symptoms.
  • Complete heart block (CHB) and seizure-like activity are rare but serious complications of hyperkalemic emergencies.
  • Accurate differentiation between seizure activity and convulsive syncope is vital for appropriate patient management.

Observation:

  • An 87-year-old female presented with a hyperkalemic emergency complicated by CHB and seizure-like activity.
  • The clinical presentation posed a diagnostic challenge in distinguishing between seizures and convulsive syncope.
  • A comprehensive medical evaluation was necessary to identify hyperkalemia as the underlying cause.

Findings:

  • Hyperkalemia can precipitate life-threatening cardiac arrhythmias such as CHB.
  • Seizure-like activity in this context may represent a manifestation of severe electrolyte imbalance rather than primary epilepsy.
  • The head-upright tilt test (HUTT) proved valuable in differentiating convulsive syncope from seizures, especially when vagal stimulation was implicated.

Implications:

  • This case underscores the importance of considering and rapidly diagnosing hyperkalemia in patients presenting with unexplained cardiac and neurological disturbances.
  • Early recognition and management of hyperkalemia are critical to prevent severe morbidity and mortality.
  • The HUTT serves as a useful diagnostic tool in challenging cases of syncope versus seizure, guiding therapeutic decisions.

Keywords:
complete heart blockconvulsive syncopehead-up tilt testhyperkalemia induced ekg changesisoproterenolrefractory hyperkalemiaseizure activity

More Related Videos

Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy11:54

Simultaneous Video-EEG-ECG Monitoring to Identify Neurocardiac Dysfunction in Mouse Models of Epilepsy

Published on: January 29, 2018

25.5K
Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits10:25

Multi-system Monitoring for Identification of Seizures, Arrhythmias and Apnea in Conscious Restrained Rabbits

Published on: March 27, 2021

6.0K

Related Concept Videos

Disturbances in Heart Rhythm01:28

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow...
1.0K
Seizures: Classification01:13

Seizures: Classification

Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
413
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
12
Introduction Cardiac Emergencies01:30

Introduction Cardiac Emergencies

Cardiac emergencies are critical situations involving the heart that require immediate medical intervention to prevent severe complications or death. These emergencies often arise from underlying heart conditions that impair the heart's ability to function correctly.Types of Cardiac EmergenciesThe most common types of cardiac emergencies include Acute Coronary Syndrome (ACS), myocardial infarction (MI), cardiac arrest, and heart failure.Acute Coronary Syndrome (ACS)Acute Coronary Syndrome (ACS)...
30
Depolarizing Blockers: Pharmocokinetics01:19

Depolarizing Blockers: Pharmocokinetics

Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...
353
Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
1.6K