Session 1 - Pictures and Drug Overdose Flashcards Preview

Semester 2 - Mechanisms of Disease > Session 1 - Pictures and Drug Overdose > Flashcards

Flashcards in Session 1 - Pictures and Drug Overdose Deck (26):

What can be seen on this image? 

Q image thumb

Coagulative necrosis


Name three features of coagulative necrosis

Q image thumb

Dead tissue has solid consitency

Ghost outline of cells

Appearance lasts a few days before phagocytes invade and ingest dead material 


What can be seen?

Liquefactive necrosis


Why does this type of necrosis occur?

Q image thumb

Release of active enzymes such as proteases by neutrophils in response to bacterial infection. 


What is the type of necrosis demonstrated in the picture? 

Q image thumb

Caseuous necrosis


How can caseuous necrosis occur?

Q image thumb

* Tissue appears amorphous

* Associated with infections such as tuberculosis


What is the type of necrosis shown here? 

Q image thumb

Fat necrosis


How can fat necrosis occur? 

Q image thumb

* Occurs in pancreatitis > release of lipases > damage adipocytes


What is the cause of this necrosis? 

Q image thumb

Infarction causing white necrosis


What causes this type of necrosis? 

Q image thumb

  • Occurs with the occlusion of an “end” artery (sole source of arterial blood to a segment of an organ). If occluded, the tissue will die and appear white due to lack of blood 


What is this type of necrosis caused by? 

Red infarction 


Why does this type of infarction occur? 

Tissue filled with blood due to extensive haemorrhage. Limited blood supply, not enough for tissue to survive so lots of blood. Can be caused by occlusion of one of a pair of arteries. 


What is the pathway for alchol metabolism?

Ethanol --> (alcohol dehydrogenase, CYPZE1, catalase) --> Acetaldehyde --> (aldehyde dehydrogenase) --> Acetate



How can excess alcohol abuse be detected in blood?

  • Elevated mean cell volume (large red blood cells) due to direct toxic effects of alcohol on bone marrow, or folate defiency.
  • Raised AST and ALT, due to damage to hepatocytes
  • Gamma-GT (aminotransferase) - Raised in regular moder and heavy drinkers 
  • Alcoholic hepatitis, eleveated serum bilirubin, aminotransferases, alkaline phosphatases 


What affect does alcohol have on liver presentation? 

How are these changes caused?

Fatty change

Acute hepatitis

Alcoholic cirrosis 

  • Caused by toxicity


What change to liver cells can been seen here, and what is the clinical name for it? 

Fatty change



What affect can alcohol have on nervous system? 

  • Wernicke syndrome, due to thiamine defiency
  • Results in ataxia (loss of voluntary muscle control), disturbed cognition, nystagmus (involuntary eye movement)


  • Korkasoff syndrome
  • Thiamine defiency + toxicity
  • Sever memory loss


  • Peripheral neuropathy
  • Epilepsy 


What affect can alcohol have on cardiovascular system? 



Beri Beri heart disease 


What affect does alcohol have on GI tract? 

Pancreatitis, leads to vitamin defiency (unable to breakdown fat, fat soluble vitamins cannot be absorbed) 


What is foetal alcohol syndrome? 

Acetaldehyde crosses over placental barrier and damages foetal brain. Causes mental retardation. 


What happens after an OD of paracetamol? 

Glutathione depleted and NAPQI binds with suplhdryl groups on liver membrane, causing necrosis and liver failure


Give three examples of patients will suffer from paracetamol OD at lower doses and why

Lower glutathione in first place

  • Alcohol with the OD
  • Malnourished 
  • HIV positive


What are the physiological effects of paracetamol overdose? 

What is the antidote? 

Liver failure at 36-96 hours and death

N-acetylcysteine, which increases availability of hepatic glutathione 


What is a method of determining severity of liver damage? 

Prothrombin time (PT), clotting in blood 

Measure Creatinine and blood pH


What are the consequences of an aspirin overdose? 

Acidosis (acetysalicylic acid) 

Increase in lactose, ketones and pyruvate also contributes to acidosis