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Flashcards in Haemodynamic Disorders Deck (64)
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Define Oedema?

An abnormal increase in interstitial fluid


Name the causes of Oedema?

Increased hydrostatic pressure ( regional or generalised) Reduced plasma oncotic pressure ( reduced albumin) Lymphatic obstruction Sodium retention Inflammation


What is generalised oedema?

Widespread accumulation of fluid in subcutaneos tissues and serous cavities


What is pitting oedema?

Pitting edema: Observable swelling of body tissues due to fluid accumulation that may be demonstrated by applying pressure to the swollen area (such as by depressing the skin with a finger).


Name the common causes of generalised Oedema?

Left Ventricular Failure Nephrotic Syndrome Hepatic Failure


Summarise the process which causes oedema?

Low renal blood flow  renin  angiotensin  aldosterone  absorption of sodium and water from kidneys  generalised oedema Renin- released from kidney Adosterone-acts on the kidneys to stimullate reabsorption of salt and water Reduced renal blood flow activation of the renin-angiotensin system  =arrow


How is Pulmonary Oedema caused?

Pulmonary Oedema is usually the result of raised pulmonary capillary hydrostatic pressure due to pulmonary venous congestion. Caused by raised hydrostatic pressure in the pulmonary capillary bed.


Name the most common cause of Pulmonary Oedema?

Left ventricular failure


Name the consequences of Pulmonary Oedema?

Breathlessness(typically worse laying flat-orthopnoea) and susceptibility to pneumonia. Breathlessness(dyspnoea) is the main symptom.


In an pulmonary oedema , fluid accumalates first in the ............ ........ and then eventually spills into the .......... ........

First- Interstitial space Second-Alveolar Spaces


What causes a Cerebral Oedema?

Cerebral Oedema is usually the result of breakdown of the normal capillary barrier


Where does a cerebral oedema usually occur?

Typically occurs in brain tissue surrounding lesions such as cerebral contusions, haemorrhages, infarcts and tumours.


What does a cerebral oedema cause?

Rise in intra-cranial pressure which can be fatal.


Name some stratagies to reduce Cerebral Oedema?

Strategies to reduce ICP include raising the head, inducing dehydration with drugs (e.g. mannitol), surgical decompression.


What does general oedema cause?

Pitting peripheral oedema Pleural Effusion Ascites Pleural effusion, sometimes referred to as “water on the lungs,” is the build-up of excess fluid between the layers of the pleura outside the lungs. The pleura are thin membranes that line the lungs and the inside of the chest cavity and act to lubricate and facilitate breathing ascites-the accumulation of fluid in the peritoneal cavity, causing abdominal swelling


Define Thrombosis?

Pathological clot formation in a blood vessel


Name the three broad factors that predispose an individual to thrombosis?

Changes in vessel wall Changes in blood flow Changes in blood coagulability


What condition is almost always related to vessel wall injury caused by atherosclerotic plaques?

Arterial Thrombosis


How does arterial Thrombosis cause infarction of tissue?

Complete blockage (occlusion) of the artery by thrombus causes infarction of the tissue supplied by the artery


How does arterial Thrombosis cause ischaemia of tissue?

Narrowing(stenosis) of the artery by thrombus causes ischaemia of the tissue supplied by the artery.


What condition is related to stasis of blood in a cardiac chamber?

Cardiac Thrombosis is usually related to stasis of blood in a caridac chanber, most commonly the left atrium in association with atrial fribulation or the left ventricle in association with a myocardial infarct


Why is left atrial thrombosis usually related to atrial fibrillation?

if the patient had AF then the left ventricle is hypokinetic and dilated.


What does a prior myocardial infarction leave you more susceptible to?

Left ventricular thrombosis


What causes cardiac thrombosis?

Abnormal cardiac contractibility and myocardial injury


What is the most important potential complication of cardiac thrombosis?

Systemic embolisation is the most important potential complication


What is an embolism?

An embolus is a detached mass within the circulatory system that is carried in the blood to a site distant from its point of origin


Where do most emboli originate from?

Most emboli are fragments of dislodged thrombus (thromboemboli).


Name some rare types of embolic material?

Fat air amniotic fluid tumour


What can an emboli lead to?

Emboli are important because they can lodge in vessels and block them off.


Where do most venous thrombo embolism originate from?

Deep ;eg vein (DVT)