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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
Disturbances in Heart Rhythm01:29

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 heart...
Holter Monitor: 24-Hour Monitoring01:23

Holter Monitor: 24-Hour Monitoring

Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...
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...
Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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...
Dysrhythmias VI: Management of Dysrhythmias01:25

Dysrhythmias VI: Management of Dysrhythmias

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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Related Experiment Video

Updated: May 19, 2026

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Auditory structure and function in the bird middle ear: an evaluation by SEM and capacitive probe.

J C Saunders

    Hearing Research
    |June 1, 1985
    PubMed
    Summary

    This study quantitatively analyzed avian middle ear anatomy and function. The tympanic membrane

    Area of Science:

    • Comparative Anatomy
    • Bioacoustics
    • Auditory Physiology

    Background:

    • The avian middle ear's conductive apparatus is crucial for hearing.
    • Understanding its structure-function relationship is key to avian auditory research.

    Purpose of the Study:

    • To anatomically characterize the avian middle ear using scanning electron microscopy.
    • To quantitatively measure key conductive apparatus components and their relationships.
    • To determine the velocity vs. frequency response of the tympanic membrane in neonatal chicks and parakeets.

    Main Methods:

    • Scanning electron microscopy for anatomical analysis.
    • Quantitative measurements of tympanic membrane, columella, and oval window.
    • Capacitive probe measurements of tympanic membrane velocity vs. frequency response (0.2–10.0 kHz).

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  • Sound Pressure Level (SPL) induced displacement measurements of the tympanic membrane.

    • Main Results:

    • Detailed measurements of avian middle ear structures were obtained.
    • The tympanic membrane velocity vs. frequency response exhibited a bandpass filter characteristic (best frequency 1.5–3.0 kHz).
    • Tympanic membrane displacement in chicks was linear with SPL and varied significantly across the membrane surface.

    Conclusions:

    • Avian middle ear anatomy shows species-specific quantitative variations.
    • The tympanic membrane's frequency response aligns with auditory perception in the mid-range.
    • These findings enhance the understanding of avian middle ear mechanics and hearing.