General articles:

Basic ECG/Pacemaker Timing

Author: Delos Johnson

Typically, electrocardiograms (ECG's) are performed with a paper speed of 25mm/sec.  When this is the case, each "large" box represents an interval of 200 milliseconds (mS)or 0.2 seconds. The "small" boxes or timing marks within each 200 mS section, repre...

Basic Information Tachycardia Therapy

Author: Delos Johnson

First of all...what's normal? The heart is a series of pumps that are carefully controlled by a very special electrical system. This electrical system attempts to regulate the heart rate between 60 and 100 beats per minute. The initial electrical signal ...

Cardiac pacing and defibrillation

Author: Online Journal of Cardiology

Recordings of pacemaker and defibrillator timing diagrams and xrays.

How pacemakers work and why they're needed

Author: Cardiovascular Institute of the South

Your heartbeat is controlled by the heart's own bioelectrical triggering system. When that system ceases to work properly, the solution may be a pacemaker.

Implantable Cardioverter / Defibrillator

Author: American Heart Association

An implantable cardioverter / defibrillator (I.C.D.) is a device designed to administer an electric shock to control tachyarrhythmias; the rapid, uncoordinated activation of individual heart fibers; and restore a normal heartbeat. The power so...

Implantable defibrillator can aid people with dangerously irregular... Implanta...

Author: Cardiovascular Institute of the South

The cardiac defibrillator is a staple of Hollywood and television medical dramas -- the device with the paddle electrodes the physician applies to the chest of a dying patient to shock the heart back into action. But it might surprise you to learn that q...

Indications for Cardiac Pacing Combination ACC/AHA & Medicare Classifications

Author: Delos Johnson

Class I  Acceptable and Necessary (Chronic and/or Recurrent Conditions)  Conditions not due to drug toxicity, acute myocardial ischemia or infarction, or electrolyte imbalance.  1.  Acquired symptomatic complete AV block with:  syncope or presyncope, seiz...

Introduction to Haemodynamic Waveforms

Author: Christian Narkowicz

Haemodynamics is the study of the dynamic behavior of blood. Traditionally, because pressure is easier to measure than flow in the cardiovascular system, it has been pressure which has undergone the more intensive study. This package starts at a basic lev...

Introduction to Rhythms and their Haemodynamic effects

Author: Christian Narkowicz

This tutorial does not intend to show you how to interpret standard 12-lead ECG traces. Nor does it intended to replace a text book by describing in detail the electrical conduction system. Rather it will describe and explain some common rhythms, and demo...

Pacemaker

Author: American Heart Association

The natural pacemaker of the heart is called the sinoatrial (S.A.) node or sinus node. It is a small mass of specialized cells in the top of the right atrium or chamber of the heart. It produces the electrical impulses that cause your heart to beat.

Pacemaker Researchers Beat Out the Rhythm of Life

Author: Lea McLees

Today's pacemaker wearers think nothing of keeping an eye on popcorn while it cooks in their microwave ovens or eating at restaurants that use the speedy appliances to prepare meals. They don't have to plan daily activities or trips to avoid sites wher...

Pacemaker/defibrillation implantation

Author: St Vincent's Cardiology

The presence of symptoms remains the most common indication for pacemaker treatment. Symptomatic bradycardia is the term used to identify clinical manifestations associated with a heart rate that does not allow cardiac output to meet physiologic demands. ...

Pacemakers and Defibrillators

Author: Robert Schoderbek, Heidi Lane, Mike Deaton, Joanne Deverson

1995 BAE 465 Student Project

The Heart: An Online Exploration

Author: The Franklin Institute Science Museum

From the moment it begins beating until the moment it stops, the human heart works tirelessly. In an average lifetime, the heart beats more than two and a half billion times, without ever pausing to rest. Like a pumping machine, the heart provides...