Showing posts with label Surgery. Show all posts
Showing posts with label Surgery. Show all posts

Sunday, March 15, 2009

The Three Brains

In his book, Study Smarter, Not Harder, Kevin Paul talks about "The Three Brains" other wise known as the "Triune Brain," and how they apply to learning. Very Interesting. Here is the nutshell:

Lower Brain: aka Mammalian Brain
Responds to stress, reacts to 'fight or flight.'
This response wants to block out our higher thought processes and operate on 'instinct' mode during times of stress. Thus it is necessary to "quiet" the mammalian brain during studies, test-taking, performing surgeries, taking a penalty kick, or any other highly intense situation where we need to stay calm, cool, and collected in order to think brilliantly. One way to train the ability to stay cool under pressure is to train under pressure.

In an article from Scientific American Mind, RaƓul R. D. Oudejans, a psychologist at Free University Amsterdam, "The best way to make a performance situation feel like rehearsal, is to subject yourself to the same anxiety-packed conditions during practice that you expect to encounter during your moment in the spotlight"...he goes on to say:

These results indicate that turning up the heat from the very first day of practice may be one of the most effective ways to immunize yourself against blowing it. “Performers train and train, but it’s not that common to specifically train under these kinds of psychological constraints,” Oudejans says. “They’re trained in how to play their game, but they don’t train under pressure, so they fail.” Training in such situations minimizes the possibility of freezing up for the same reason that letting spiders crawl all over you makes them less frightening: your brain gradually adapts, so that circumstances that once would have made you uneasy no longer feel novel or threatening. “The more exposure you get to these high-pressure situations, and the more you succeed [despite them], the less likely you’re going to get that whole affective experience,” explains Art Markman, a psychologist at the University of Texas at Austin. In other words, the more comfortable you feel, the less likely you are to be affected by pressure.

Middle Brain: aka Limbic Brain
Responds to emotions, long term memory.
Studying, learning with strong emotions attached will increase our long term memory.

Higher Brain: aka Cortical Brain (Neocortex:cerebral cortex)
Responsible for our high level thinking. The mind must be "quiet" and in a state of relaxed intensity in order to think at such high levels. Listening to Baroque music composed at 60 beats per minute is a great way to induce "the zone" and relaxed intensity due to the stimulation of the alpha waves of the brain (which are active during times of relaxed intensity).

I'm going to go and turn on some baroque music now and activate my cerbral cortex!

Saturday, March 7, 2009

Jesus: The Almighty Physician

Walk with me and work with me—watch how I do it.
~ Jesus in Matthew 11.28

This picture is my Prayer...Jesus guiding me, performing surgeries through me...Slinging My Stone, Time To Scrub In!

Friday, December 5, 2008

Aortic Valve Replacement

Aortic valve replacement is a cardiac surgery procedure in which a patient's aortic valve is replaced by a different valve. The aortic valve can be affected by a range of diseases; the valve can either become leaky (aortic insufficiency / regurgitation) or partially blocked (aortic stenosis). Aortic valve replacement currently requires open heart surgery.


Two Types of Valves can be used: Tissue or Mechanical

Surgical Procedure
Aortic valve replacement is most frequently done through a median sternotomy, meaning the chestbone is sawed in half. Once the pericardium has been opened, the patient is placed on cardiopulmonary bypass machine, also referred to as the heart-lung machine. This machine takes over the task of breathing for the patient and pumping his blood around while the surgeon replaces the heart valve.

Once the patient is on bypass, an incision is made in the aorta. The surgeon then removes the patient's diseased aortic valve and a mechanical or tissue valve is put in its place. Once the valve is in place and the aorta has been closed, the patient is taken off the heart-lung machine. Transesophageal echocardiogram (TEE, an ultra-sound of the heart done through the esophagus) can be used to verify that the new valve is functioning properly.

Bag of Worms
As the patient is warmed and brought back to normal 37 degrees Celsius and the heart begins to pump again, the heart can possibly go into v-tach. This is because it has been "asleep" for around 4 hours and when it "wakes" back up, it may over compensate by pumping all of its muscles at once. It will look like a "bag of worms" as all the muscles quiver and fire together. The patient can be "Charged" with electric shocks to stop the v-tach and regulate the heartbeat.

Pacing Wires and Drainage Tubes
Pacing wires are usually put in place, so that the heart can be manually paced should any complications arise after surgery. Drainage tubes are also inserted to drain fluids from the chest and pericardium following surgery. These are usually removed within 36 hours while the pacing wires are generally left in place until right before the patient is discharged from the hospital.

Source: http://en.wikipedia.org/wiki/Aortic_valve_replacement

In order to perform the procedure, Cardioplegia must be performed. Cardioplegia is the intentional and temporary cessation of cardiac activity, primarily used in cardiac surgery.

Source: http://en.wikipedia.org/wiki/Cardioplegia