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Related Concept Videos

Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
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Decreased pulse rate01:14

Decreased pulse rate

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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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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...
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Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
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The Parasympathetic Nervous System01:14

The Parasympathetic Nervous System

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Overview
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Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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Updated: Apr 27, 2026

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
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[Pacing in vasovagal syncope].

D Graf, P Pascale, P Carroz

    Revue Medicale Suisse
    |June 27, 2014
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    Summary
    This summary is machine-generated.

    Cardiac pacing may benefit older patients with vasovagal syncope, specifically those experiencing prolonged sinus pauses. This intervention helps prevent recurrent fainting episodes in select individuals.

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    Area of Science:

    • Cardiology
    • Neurology

    Background:

    • Vasovagal syncope, characterized by reflex bradycardia and vasoplegia, causes cerebral hypoperfusion and loss of consciousness.
    • Existing literature presents conflicting evidence regarding the efficacy of cardiac pacing for preventing recurrent vasovagal syncope.

    Purpose of the Study:

    • To critically review the literature on cardiac pacing for vasovagal syncope.
    • To clarify discrepancies in study results by analyzing inclusion criteria.

    Main Methods:

    • Literature review and critical analysis of studies on cardiac pacing for vasovagal syncope.
    • Examination of patient demographics and syncope characteristics within included studies.

    Main Results:

    • Conflicting results were observed regarding the general benefit of cardiac pacing.
    • A specific subgroup of patients, defined by age over 50 and prolonged sinus pause during syncope, demonstrated a clear benefit from pacemaker implantation.

    Conclusions:

    • Cardiac pacing is beneficial for vasovagal syncope recurrence prevention only in patients over 50 years old with documented prolonged sinus pauses.
    • Careful patient selection based on specific criteria is crucial for successful pacemaker intervention in neurocardiogenic syncope.