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Medical Engineering

Pacemaker Information

Ahmed Bilal Saturday 1st March 2008

Pacemakers are battery-powered devices that function to electrically stimulate the heart to contract and thus to pump blood throughout the body. It consists of two parts the generator and the leads. The generators weigh less than 30 grams and the battery can last anywhere from 7-8 years on average and is replaced when necessary. Pacemakers are usually implanted in patients in whom the heart's own "spark plug" or electrical system is no longer functioning normally.

The sinoatrial (SA) node, located in the right atrium, is the heart s normal spark plug which generates an electrical impulse that signals the left and right atria to contract and pump blood into the ventricles. The impulse then travels down into another small patch of specialized heart tissue called the atrioventicular nod…

Electrocardiogram EKG For Heart Disease

A.J. Michael Monday 25th February 2008

Electrocardiogram (ECG or sometimes known as EKG) offers two types of information. It measures the length it takes for electrical waves to travel through the heart and the amount of electrical activit…

The Dehydroepiandrosterone Molecule

Physiological Stress Markers

A J Michael Saturday 23rd February 2008

Although psychological approach in measuring stressors provides to some extent the mechanisms in which stress affects health or illness, a better measure would be a physical or biological measure. Psy…

Grays Anatomy

V F Murphy Friday 15th February 2008

Gray\'s Anatomy is widely respected as a textbook. The quality of illustration and great detail of explaination within this classic book points towards the original excellence of Henry Gray.

Basic venous plethysmography

Measurement of Blood Flow

V F Murphy Sunday 13th January 2008

Continuous wave ultrasound

Continuous wave ultrasound probe techniques involve an ultrasound signal being transmitted into the skin, and the difference in frequency reflected being measured. Along…

What is Cell Differentiation?

Vincent Murphy Wednesday 19th March 2008

At the beginning of a new life, DNA from a spermatozoon ( sperm cell ) enters an oocyte ( egg cell ). This results in a single zygote, a cell which will eventually divide through mitosis to form every…

What is Tissue Engineering?

Vincent Murphy Tuesday 18th March 2008

It is a matter of public record that the loss of tissue and organ functionality is very costly to treat, being estimated at some $350 to 400 billion dollars a year within the US alone, around 8% of to…

Cartilage Tissue Engineering

Vincent Murphy Thursday 13th March 2008

The human articulating joints, particularly those of the lower limbs, are able to last a lifetime, with good care, and good luck. All-too-often, however, either through traumatic injury or a simple ov…

Tissue Engineered Heart Repair

Diana Oprean Wednesday 12th March 2008

Recent research has uncovered the role of a naturally-occurring protein which can promote healing after a heart attack.

Researchers at Toronto General Hospital, University Health Network have dis…

Advantages and Disadvantages of Tissue Engineering

Diana Oprean Tuesday 11th March 2008

Thousands of people of all ages are admitted to hospitals daily because of the malfunction of a vital organ. Until very recently, it was believed that the only solutions to treat these cases were orga…