Resource Library: Find information on Surgery at MerckSource

Resource Library: Find information on Surgery at MerckSource: "Surgery Reference: An encyclopedia of surgeries"

Resource Library: Find information on Disease at MerckSource

Resource Library: Find information on Disease at MerckSource: "Disease Reference "

Go here to find encyclopedic discriptions of diseases often with pictures!

Resource Library: Find information on Thoracic aortic aneurysm at MerckSource

Resource Library: Find information on Thoracic aortic aneurysm at MerckSource: "Thoracic aortic aneurysm

Definition:
A thoracic aortic aneurysm is a localized expansion of the wall of the aorta.


Alternative Names:
Aortic aneurysm - thoracic; Syphilitic aneurysm; Aneurysm - thoracic aortic


Causes, incidence, and risk factors:
Thoracic aortic aneurysms are caused by hardening of the arteries (atherosclerosis), high blood pressure (hypertension), congenital disorders such as Marfan's syndrome, trauma, or less commonly, syphilis.
Atherosclerosis is by far the most common cause.
Thoracic aneurysms occur in the ascending aorta (25% of the time), the aortic arch (25% of the time), or the descending thoracic aorta (50% of the time).
Risk factors include various connective tissue disorders (such as Marfan's syndrome), atherosclerosis, previous dissection of the aorta, prolonged hypertension, and trauma (usually falls or motor vechicle accidents)."

Resource Library: Find information on Aneurysm at MerckSource

Resource Library: Find information on Aneurysm at MerckSource: "Aneurysm

Definition:
An aneurysm is an abnormal widening or ballooning of a portion of an artery, related to weakness in the wall of the blood vessel. Some common locations for aneurysms include:
Aorta (the major artery from the heart; see abdominal aortic aneurysm and thoracic aortic aneurysm)
Brain (cerebral aneurysm)
Leg (Popliteal artery aneurysm)
Intestine (Mesenteric artery aneurysm)
Splenic artery aneurysm"

Resource Library: Find information on Aortic stenosis at MerckSource

Resource Library: Find information on Aortic stenosis at MerckSource: "Aortic stenosis"

Postgraduate Medicine: Congestive Heart Failure Symposium: Diastolic Heart Failure

Postgraduate Medicine: Congestive Heart Failure Symposium: Diastolic Heart Failure:
It is work to relax???

This image shows Aortic pressure as well as pressure in the left ventricle and left atrium. The phases listed are those of diastole (systole is on the left near zero and not discussed in this text). One remarkable thing about this graph is it says the atrium never sees high pressure... It is just a low pressure volume pump? Anyway, Here is the picture:
"What is normal diastole?
Diastole consists of four hemodynamic phases. The first phase, isovolumic relaxation, extends from aortic valve closure to mitral valve opening, during which the left ventricular volume remains constant as left ventricular pressure falls with myocardial relaxation. Although overall left ventricular volume does not change during this phase, changes in left ventricular shape may occur.
The second phase of diastole is the rapid filling phase, which begins when left ventricular pressure falls below left atrial pressure, opening the mitral valve. During this phase, left ventricular pressure falls despite increasing left ventricular volume. This creates a vacuum that assists in diastolic filling. Rapid filling continues until the pressures in the atrial and ventricular chambers equalize and ventricular filling stops, marking the beginning of the third phase, termed diastasis.
During diastasis, left atrial and left ventricular pressures are in equilibrium and little filling occurs. The final phase of diastole is atrial contraction, which contributes about 15% to 25% of the total left ventricular filling in normal subjects.
Left ventricular diastolic relaxation proceeds as calcium is released from its binding site on troponin-C, allowing the actin-myosin cross-bridges to dissociate. This free cytoplasmic calcium must then be taken up into the sarcoplasmic reticulum against a large concentration gradient. This is an energy-requiring mechanism. Although early left ventricular diastolic filling is referred to as passive, myocardial relaxation is not a passive process."

Cardiac Cycle

Cardiac Cycle

More not quite satisfying Cardiac Cycle information.

Systole

Systole

A link on systole worth knowing about but not completely satisfying.

Diastole - Medical Dictionary definitions of popular medical terms

Diastole - Medical Dictionary definitions of popular medical terms: "Diastole: The time period when the heart is in a state of relaxation and dilatation (expansion).
The final letter in 'diastole' is pronounced as a long 'e' as in 'lee.' The adjective for diastole is diastolic.
The diastolic pressure is specifically the minimum arterial pressure during relaxation and dilatation of the ventricles of the heart. Diastole is the time when the ventricles fill with blood.
In a blood pressure reading, the diastolic pressure is typically the second number recorded. For example, with a blood pressure of 120/80 ('120 over 80'), the diastolic pressure is 80. By '80' is meant 80 mm Hg (millimeters of mercury).
A diastolic murmur is a heart murmur heard during diastole, the time the heart relaxes.
'Diastole' came without change from the Greek diastole meaning 'a drawing apart.' The term has been in use since the 16th century to denote the period of relaxation of the heart muscle."

Medical Dictionary definitions of popular medical terms

Medical Dictionary definitions of popular medical terms

If you are willing to scroll past the ads in the page this seach box return, you get great results! The box just to the left of the "Look it up" link is the one to use.

Search for dictionary headwords

Search for dictionary headwords

A more useful place to type in a latin word than the link below!

Charlton T. Lewis, Charles Short, A Latin Dictionary

Charlton T. Lewis, Charles Short, A Latin Dictionary


Here is the best match for "cava" in Lewis and Short. The definition is at the bottom of the page.

Dictionary.com/allometric

Dictionary.com/allometric: "al�lom�e�try ( P ) Pronunciation Key (-lm-tr)
n.
The study of the change in proportion of various parts of an organism as a consequence of growth."

This is the result of using a google search as dictionary by clicking on the link in the header bar that appears just before the search time! Vince told me about this.

Resource Library: Find information on Heart, section through the middle at MerckSource

Resource Library: Find information on Heart, section through the middle at MerckSource

This section shows the connective tissue on the tricuspid valve and the mitral valves that keeps them from inverting when the ventrical contracts.

Arthritis drug Vioxx taken off the market - OCT 2, 2004

Arthritis drug Vioxx taken off the market - OCT 2, 2004

What was it doing to double the occurrence of Heart Attack and Stroke over time?

Treating Systolic High Blood Pressure In Older Persons Is Beneficial

Treating Systolic High Blood Pressure In Older Persons Is Beneficial

Systolic search

Dictionary.com/luminal

Dictionary.com/luminal

Luminal appears to be the internal diameter of a blood vessel

Dictionary.com/sinus

Dictionary.com/sinus

Sinus definition

Dorlands Medical Dictionary

Dorlands Medical Dictionary

Ostium definition

Province of MB | The PCSIR - Ch 2 - How a normal heart works

Province of MB | The PCSIR - Ch 2 - How a normal heart works

This is a detailed description of how a normal heart works with both images and text. Here is one image (follow the link above for definitions of those parts annotated only with numbers):