Search Medical Lecture Notes
medicalpptonline.blogspot.com contains lecture notes in most fields of medicine. You can directly copy lectures to your laptop ,no need of downloading or streaming

Lectures are collected from various sources.I will not be responsible for any typing error and out dated medical facts.Visitors are advised to cross check the information

Please give the authors the credit they deserve and do not change the author's name

If any of of you have a good personal power point presentations Email me i will upload it here.

ECG 1-Basics

Normal Impulse Conduction
Sinoatrial node--AV node--Bundle of His--Bundle Branches--Purkinje fibers




The “PQRST”
►    P wave - Atrial   depolarization


        QRS - Ventricular    depolarization
        T wave - Ventricular   repolarization




The PR Interval
Atrial depolarization
+
delay in AV junction
 (AV node/Bundle of His)

 (delay allows time for the atria to contract before the ventricles contract)



Pacemakers of the Heart
►    SA Node - Dominant pacemaker with an intrinsic rate of 60 - 100 beats/minute.

►    AV Node - Back-up pacemaker with an intrinsic rate of 40 - 60 beats/minute.

►    Ventricular cells - Back-up pacemaker with an intrinsic rate of 20 - 45 bpm.



The ECG Paper


►    Horizontally
    One small box - 0.04 s
    One large box - 0.20 s
►    Vertically
    One large box - 0.5 mV

►    Every 3 seconds (15 large boxes) is marked by a vertical line.
►    This helps when calculating the heart rate.

DOWNLOAD this presentation

OTHER DOWNLOAD LINKS

Labels:

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)
Related Posts Plugin for WordPress, Blogger...