Phase 2 Flashcards
(358 cards)
Describe GCS ratings
Summarise Causes of Asterixes
(think body systems and causes)
Note, on examination:
“There is a significant latent period between adopting the posture and the beginning of asterixis, so it is important to wait at least 30s before concluding that the sign is absent”
What is Asterixis?
Asterixis describes sudden, brief, arrhythmic lapses of sustained posture owing to involuntary interruption in muscle contraction.
Its pathophysiology is unclear, although there are several theories.
There seems to be a role for the ascending activating systems, connected with arousal, which are disturbed in encephalopathies and in lesions of the thalamus and midbrain
Define type 1 and type 2 respiratory failure
Hypoxic - TYPE I - respiratory failure is hypoxia without hypercapnia and with an arterial partial pressure of oxygen - PaO₂ < 60 mmHg or 8kPa on room air at sea level.
Hypercapnic - TYPE II - respiratory failure is hypoxia with an arterial partial pressure of carbon dioxide - PaCO₂ > 50mmHg or 6.5 kPa on room air at sea level.
What is the Anion gap and how is it calculated?
- The Anion Gap (AG) is a derived variable primarily used for the evaluation of metabolic acidosis to determine the presence of unmeasured anions
- An elevated anion gap strongly suggests the presence of a metabolic acidosis
= (Na+) - (Cl− + HCO3−)
Normal AG
12 ± 4 mEq/L (if the calculation does not employ potassium)
16 ± 4 mEq/L (if the calculation employs potassium)
Summarise phases of clinical trials
Phase 1 - small number of patients (20-80) to assess initial human safety (first in man), potential side effects and effective dosage
Phase 2 - larger number of participants, in the low hundreds, is recruited in order to collect more data on safety as well as efficacy (whether the intervention or drug works as intended or otherwise)
Phase 3 - If the results from Phase II continue to be positive a Phase III trial will be undertaken with a larger number of participants (from several hundred to
several thousand).
What is the “Hounsfield Scale?”
A quantitative scale for describing radiodensity - frequently used in CT scans
Measured in “Hounsfield Units”
Water = 0
Air <-1000
Cortical Bone >1000
What are “Vesicular Sounds” on auscultation?
Normal breath sounds
Soft, low pitched, rustling in quality
Insp:Exp time = 2:1 roughly
What family of drugs is “Verapamil”?
Indications?
Side effects?
- Non-dihydropyridine calcium channel blocker
- Bradycardia, Angina, SVT
- Constipation, hypotension, headache, nausea
What category is the drug “Sacubitril/valsartan” sold under the brand name “Entresto”?
Indications?
Side effects?
ARNi
- Sacubitril - Neprilysin Inhibitor
- Valsartan - Angiotensin receptor blocker
- Considered first line in patients with newly diagnosed HFrEF,
- or for patients with symptomatic HFrEF despite ACEI (or ARB) and beta-blocker therapy
- Hyperkalemia, hypotension, ANGIOEDEMA, birth defects (valsartan)
Sacubitril must never be used with ACE inhibitor - cause life threatening angioedema - swollen tongue causes asphyxiation
Always use Sacubitril with ARB - Allow 36hr washout when switching from ACE-I
Causes of chronic kidney disease (CKD)
- Diabetes Mellitus - 33%
- Glomerulonephritis - 24%
- Hypertension - 14%
- Polycystic kidneys - 7%
Describe lung lobes for auscultation/percussion
Name some differentials for haemoptysis -
think broad headings and subcauses
Assessment tool for management of Community Acquired Pneumonia (CAP)
CURB-65
Note - can also use CRB-65 in GP (without the uraemia)
Recommended empirical therapy for low-severity community acquired pneumonia (CAP)
Monotherapy - Follow up within 48 hrs
- Amoxicillin 1 g orally, 8-hourly
Or patients with hypersensitivity to penicillins:
- doxycycline 100 mg orally, 12-hourly
OR if doxycycline is poorly tolerated
- clarithromycin 500 mg orally, 12-hourly;
Duration of therapy:
If the patient has significantly improved after 2 to 3 days of antibiotic therapy, treat for 5 days.
If the clinical response is slow, treat for 7 days. If the patient is not improving after 48 hours of monotherapy, reassess the diagnosis.
Major causes of Chronic Kidney Disease
- Diabetes mellitus
- Hypertension
- Glomerulonephritis
- The rest:
- polycystic kidney disease,
- urinary tract obstruction,
- reflux nephropathy,
- medication-induced nephropathy
Major causes of intra renal aki
- Acute tubular necrosis - most common
- Pre renal aki
-
Acute interstitial nephritis caused by:
- B-lactam antibiotics - trimethoprim-sulfamethoxasol
- Proton pump inhibitors - Omeprazole, pantoprazole
- Infiltrative diseases - SLE, Sarcoidosis, Amyloidosis
- Infections
- Glomerulonephritis - inflammation of the glomerulus due to hypersensitivity reactions
- Thrombotic microangiopathies - small clots plugging
Causes of pre-renal AKI
Pre-renal AKIs are caused by underperfusion of the kidneys
Causes include:
- Intravascular volume depletion - dehydration, diarrhoea, excessive vomiting
- Sepsis
- Cardiogenic
- Liver cirrhosis - hypoalbuminaemia
- Renal artery stenosis
- Drugs compounding - NSAIDs, ACEi, Loop Diuretics
- Occlusion of renal artery - such as a clot caused by atrial fibrilation
Causes of post renal AKIs
- Neoplasm - urothelial
- Renal calculus - obstructing flow
- Prostatic hypertrophy - benign or cancer
- Catheter - kinked or obstructed with sediment
- Bladder not contracting - neurogenic reduction of detrusor contractability, or anticholinergic drugs inhibiting contraction
What is Well’s Criteria?
Criteria for Pulmonary Embolism
RESULT SUMMARY:
Score is 0-12.5 points
High risk group: 40.6% chance of PE in an ED population.
Another study assigned scores > 4 as “PE Likely” and had a 28% incidence of PE.
No = 0 Yes = as below
INPUTS:
- Clinical signs and symptoms of DVT —> 3 = Yes
- PE is #1 diagnosis OR equally likely —> 3 = Yes
- Heart rate > 100 —> 1.5 = Yes
- Immobilization at least 3 days OR surgery in the previous 4 weeks —> 1.5 = Yes
- Previous, objectively diagnosed PE or DVT —> 1.5 = Yes
- Hemoptysis —> 1 = Yes
- Malignancy w/ treatment within 6 months or palliative —> 1 = Yes
What are the most common causes of Infectious Endocarditis?
Vast majority of cases (80-90%) stem from:
Gram Positive streptococci, staphylococci and enterococci infection
- Staphylococcus aureus responsible for 30% of cases in developed world
- Other various strepotococci
- Oropharynx HACEK organisms (Haemophilus, Actinobacillus, Cardiobacterium, Eikenella, and Kingella) less frequently
- 1% cases can be fungal - Candida & Aspergillus - Typically fatal
Describe “Light’s Criteria”
Classifies pleural effusion as Transudative or Exudative
Classified as Exudative if at least one of the following is met:
- 1 - Pleural fluid protein/serum protein ratio > 0.5
- 2 - Pleural fluid LDH/serum LDH ratio > 0.6
- 3 - Pleural fluid LDH is more than two-thirds of the upper limits of normal laboratory value for serum LDH
LDH = Lactate Dehydrogenase
Most common causes of Transudative Pleural Effusions
- Congestive Heart Failure
- Cirrhosis - Insufficient Albumin production
- Nephrotic syndrome - Excessive albumin loss in urine
Most Common Causes Exudative Pleural Effusion
When a pleural effusion is determined to be exudative, additional evaluation is needed to determine its cause - so we should measure amylase, glucose, pH, cell counts and gram staining
Causes include:
- Malignancy - primary lung or mets to pleura from elsewhere (cytology, low glucose)
- Infection - empyema due to bacterial pneumonia (pH < 7.2, low glucose) - if TB is possible stain for this
- Pulmonary Embolism (or infarction)
- Trauma
- Autoimmune disorders
- Pancreatitis
- Parapneumonic effusion due to pneumonia