Week 8 Respiratory Flashcards
what does SARS-CoV-2 stand for
severe acute respiratory syndrome coronavirus 2
Outline the epidemiology of SARS-CoV-2
Virus factors- virus genome mutates, leading to changes in viral proteins
Virus transmission-Zoonotic infection, respiratory and faecal-oral transmission
Host factors-receptors expressed by different hosts, ACE 2 receptors, contact with animals, air travel and other human behaviours
Outline the pathophysiology of COVID19
-infection of endothelial cells
-spread of virus
-innate immune response activated
-cytokine storm
-ARDS
-activation of ACE-2
-post covid symptoms
what are the post acute COVID 19 symptoms
fatigue, dyspnoea, cough, chronic co morbidities eg CKD
Name the two phases of COVID-19 infection
-rapid viral propagation
-uncontrolled inflammatory response (cytokine storm)
what are the phases of rapid viral propagation
-exposure and entry
-initial replication
-symptom onset
-viral shedding
describe the exposure and entry phase of rapid viral propagation
the infection begins with exposure to the SARS-CoV-2 virus, primarily through respiratory droplets. The virus enters the body through the respiratory tract (nose or mouth)
describe the initial replication phase of rapid viral propagation
after entry, the virus rapidly replicates in the URT (throat and nasal passages), it then spreads to LRT where it can infect the lungs
describe the symptom onset phase of rapid viral propagation
during the phase, many individuals may remain asymptomatic or experience mild to moderate symptoms, including fever, cough, sore throat, loss of taste or smell
describe the viral shedding phase of rapid viral propagation
infected individuals can shed the virus and are contagious during this phase, contributing to spread of disease to others
Describe what is meant by a cytokine storm
-During programmed cell death (PCD), pro-inflammatory cytokines are released.
-This can trigger a cytokine storm, an excessive immune response.
-Cytokines include PAMPs (pathogen-associated molecular patterns) and DAMPs (damage-associated molecular patterns), signaling danger to the immune system.
-A cytokine storm can cause widespread inflammation.
-This inflammation can result in end-organ damage (lungs, liver, kidneys) as the immune response becomes harmful instead of protective.
list the symptoms of COVID-19
fever
cough
fatigue
anosmia
sore throat
dyspnoea
headache
describe fever aș a symptom of COVID 19
Elevated body temperature, often a common early (premature) symptom of COVID-19
describe cough as a symptom of COVID 19
persistent dry or productive cough, typically accompanied by respiratory discomfort
describe fatigue as a symptom of COVID 19
profound tiredness and weakness, a common symptom experienced during COVID 19 infection
describe anosmia as a symptom of COVID 19
an abrupt loss or alteration of ones ability to smell, associated with COVID 19
describe sore throat as a symptom of COVID 19
a scratchy or painful throat, sometimes accompanied by difficulty swallowing can be a symptom of covid 19
describe dyspnoea as a symptom of COVID 19
SOB can present in severe COVID 19
describe headache as a symptom of COVID 19
a persistent and often severe headache, which can accompany other COVID symptoms
Outline acute respiratory distress syndrome as a complication of COVID
-in the second phase of COVID T2 alveolar cells can lose the ability to secrete surfactant
-this is due to structural changes to lungs (dysregulated pro-inflammatory cytokine release)
-ARDS can lead to tachypnoea, low blood O2, rattling sound on auscultation
List the preventions for COVID
-social distancing
-mask wearing
-vaccination
-hand hygiene
describe social distancing as prevention for COVID 19
maintain physical distancing of at least 2 m from others, particularly in high risk and crowded areas
describe mask wearing as a prevention for COVID
encourage face mask use, especially indoor or crowded areas to reduce spread of respiratory droplets
describe vaccination as a prevention for COVID
encourage eligible individuals to receive COVID vaccines to reduce risk of infection and severe symptoms