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193271
CORONARY HEART DISEASE
Descrição
Biology
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biology
biology
Mapa Mental por
simone.marx
, atualizado more than 1 year ago
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simone.marx
quase 11 anos atrás
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CORONARY HEART DISEASE
CHD : if coronary artery becomes blocked ...
1. Supply of blood to heart muscle interrupted
2. Heart muscle cells deprived of glucose + oxygen
Poisonous wastes build up, e.g: lactic acid
Muscle starved of oxygen may die
3. Part of heart muscle stops contracting, causes HEART ATTACK
Damaging or fatal {depending on extent of muscle damage} as other tissues in body do not get oxygen + nutrients if heart stops beating
CORONARY CIRCULATION
Heart Muscle has own blood supply
1. Blood delivered to capillary beds in walls of heart through CORONARY ARTERIES
Branch off from aorta where it leaves L. ventricle
So heart has high-pressure supply of blood filled w/ Oxygen + Glucose
2. Useful substances (oxygen + glucose) removed by heart muscle cells + replaced w/ wastes e.g: CO2
2. Blood returns to circulation via CORONARY VEINS
Pour blood into vena cava
SURVIVORS
Many people survive heart attacks
Have TREATMENT + adjust LIFESTYLE
TREATMENT
If doctor thinks person has CHD, ANGIOGRAM is done
Picture of state of coronary arteries
If blocked, Coronary Artery BYPASS OP. done
CA BYPASS OP.
Blood vessel from another part of body removed + stitched onto place between aorta + unblocked part of CA
Artificial vessel sometimes used
Bypass increases blood flow + reduces likelihood of angina (chest pain)
LIFESTYLE
See : Prevention
PREVENTION
Do not smoke
Avoid fatty foods
Have regular aerobic exercise
Many middle aged men: [highest risk group]
Drink 1/2 aspirin/day
Helps stop clots which block arteries forming
Drink little bit of alcohol
Red wine = beneficial
SYMPTOMS
Breathless when exercising
Angina [chest pains]
Heart attack
Heart failure
Arrhythmia [irregular heartbeat]
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