Canon EF 70-300mm f/4-5.6 IS USM Lens for Canon EOS SLR Cameras

!#8#Canon EF 70-300mm f/4-5.6 IS USM Lens for Canon EOS SLR Cameras

Brand : Canon
Rate :
Price : $549.00
Post Date : Feb 29, 2012 23:42:29
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Featuring the latest 3-stop Image Stabilizer for outstanding camera shake reduction, the EF 70-300mm f4-5.6 IS USM zoom lens also features super responsive autofocus. Replacing the popular EF 75-300mm f4-5.6 IS USM, the world's first interchangeable lens with Image Stabilizer (IS), the lens is expected to appeal to serious amateur nature and sports photographers looking to achieve outstanding results while shooting hand held.

Features

• 70-300mm focal length
• EF mount; telephoto zoom lens
• 3-stop Image Stabilizer for outstanding camera shake reduction
• Electro-magnetic diaphragm (EMD) helps create an attractive, even defocused background at large apertures
• Ring-type UltraSonic Motor (USM)

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Automated External Defibrillators - The History and the Invention of AEDs

!±8± Automated External Defibrillators - The History and the Invention of AEDs

The discovery that someone's heart can be restarted with the use of an electrical charge is one of modern medicine's greatest developments. This idea began around 1888 when Mac William suggested that ventricular fibrillation could be a sudden death cause. In 1989, Batelli and Prevost made the discovery that large amounts of voltage provided to the heart could halt ventricular fibrillation within animals. Other studies completed in the nineteenth century by scientists furthered electricity's effects on the heart.

An AED (automated external defibrillator) is a portable electronic device that is able to determine someone's heart rhythm. It detects life threatening issues within the heart and has the ability to treat them with defibrillation. If necessary, an AED can provide electric shock to the heart to restore a normal heart rhythm. When someone suffers from a sudden cardiac arrest, the chances of him or her surviving is reduced to between 7 and 10 percent with each minute that passes without either CPR or defibrillation.

The first successful defibrillation on a human was reported in 1947 by Dr. Claude Beck. During one of his surgeries, he noticed his patient was experiencing ventricular fibrillation. He administered an alternating current of 60 Hz and stabilized the heartbeat. This particular patient of his lived; defibrillators were created.

An AED has a built-in computer that assesses a heart's rhythm, determines if it needs defibrillation and then administers the needed level of shock. The user of the AED is guided through this process with either audible prompts, visual prompts or both. Automated external defibrillators are usually sold in kits that contain a power unit, paddle electrodes and accessories. Each part is made individually and then put together through an integrated process. Today, manufacturers of medical devices have created many defibrillators, external and internal, that are able to add years to the lives of many patients.

External defibrillators can be used at hospitals or emergency sites. The user begins by turning on the defibrillator and applying conductive gel on the patient's chest or paddle electrodes. The level of energy is then decided upon and the instrument charges. The paddles are firmly placed on the chest with some pressure. Buttons found on the electrodes are pressed at the same time and electric shock is then delivered to the patient. After this procedure, the heartbeat is then monitored for a regular heartbeat. The entire process is then repeated if needed.

In 1954, the first closed-chest defibrillation was performed on a dog by William and Kouwenhoven Milnor. This process was studied by Paul Zoll in 1956 and he performed the first successful on a human. Qilliam Bennett Kouwenhoven, born in Brookly in 1886, was an electrical engineer and invented three defibrillator and also developed CPR techniques.

The AED (automated external defibrillator) was created in 1978. This particular device is made with sensors that are placed on the chest to decide is ventricular fibrillation is occurring. If it is detected, the device gives the proper instructions for providing an electrical shock. These automated devices have been able to reduce the training that is needed to use defibrillators and have also saved thousands of people's lives.

Automated External Defibrillators - The History and the Invention of AEDs

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What Is the Difference Between a Heart Attack and Cardiac Arrest?

!±8± What Is the Difference Between a Heart Attack and Cardiac Arrest?

Although you may have heard the terms cardiac arrest and heart attack used interchangeably, they are two distinct situations with different symptoms and effects. The term heart attack refers to the muscle tissue in the heart being damaged by lack of blood flow. When a person experiences a heart attack, it is usually due to a blood clot in one of their heart's major arteries which drastically limits or stops the blood flow to the heart. Once the flow of blood is cut off from the muscle tissue in the heart, it will begin to die and cause severe chest pains.

Symptoms of Heart Attack:
Chest Pain Pressure, heaviness or tightness in the chest Pain or pressure in the neck or jaw Shortness of Breath Sweating Pain or throbbing at or in-between the shoulder blades

The condition cardiac arrest refers to when the heart actually fails to pump blood to the bodies vital organs. In the case of cardiac arrest, the heart will either stop pumping blood adroitly, or vary in speed which would render it useless. A person experiencing cardiac arrest can die within four minutes if not immediately receiving efficient medical attention. There are three main causes for sudden cardiac arrest are ventricular fibrillation, ventricular tachycardia, and asystole.

Ventricular Fibrillation

Ventricular fibrillation occurs when the heart muscle begins to quiver erratically, leading to a loss of blood flow through the heart.

Treatments for ventricular fibrillation include CPR and defibrillation

Ventricular Tachycardia

Ventricular tachycardia is a problem in which a recurring loop in the conduction pathways of the heart gives way to rapid contractions of the ventricles.

As a result, the victims blood pressure and overall blood flow will be greatly reduced due to the inability of the ventricles to fully fill with blood between contractions

Asystole

Asystole is the absolute standstill of the heart muscle

It is very important to recognize the difference between a heart attack and cardiac arrest. In the instance of a heart attack, immediately seek medical attention by calling 9-1-1 or getting to your local ER center. In a cardiac arrest situation, immediate action has to be taken to save the person's life in the form of an automatic external defibrillator (AED). The AED unit is a small, portable, and civilian friendly (easy to use) defibrillator that can be used in order to jump start a persons heart long enough for medical attention to arrive.

What Is the Difference Between a Heart Attack and Cardiac Arrest?

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