Paeds Flashcards
(625 cards)
HUS triad
- Low platelet count (thrombocytopenia)
- consumption of platelets for blood clots - Haemolytic anaemia (normocytic - HHAAA)
- blood clots within the small vessels chop up the red blood cells as they pass by (haemolysis), causing anaemia - Acute kidney injury
- blood flow through the kidney is affected by the clots and damaged red blood cells, leading to acute kidney injury
HUS presentation
Brief gastroenteritis (bloody diarrhoea)
5 days after:
Reduced urine output
Haematuria
Abdominal pain
Lethargy and irritability
Confusion
Hypertension
Bruising
Causes of HUS
Most common cause: toxin produced by E.coli called the shiga toxin
- shigella also produces this toxin and can cause HUS
The use of antibiotics and anti-motility medications such as loperamide to treat the gastroenteritis INCREASE THE RISK of developing HUS
Infective mononucleosis causative organism
Epstein Barr Virus (EBV)
Features of infectious mononucleosis
Fever
Sore throat
Fatigue
Lymphadenopathy
Tonsillar enlargement with white coating
Splenomegaly (and in rare cases splenic rupture)
intensely itchy maculopapular rash in response to AMOXICILLIN or cefalosporins in 99% of patients
Infectious mononucleosis tests
‘Mono spot test’ for heterophile antibodies (produced in response to EBV infection)
- can take up to 6 weeks for these antibodies to be produced
Anti-viral capsid antigen (VCA) antibody test
- IgM antibody: rises early and suggests acute infection
- IgG antibody: persists after the condition and suggests immunity
5 signs of leukaemia
Failure to thrive
Pallor (anaemia)
Neutropenia (infection)
Petechiae + abnormal bleeding/bruising (secondary to thrombocytopenia)
Lymphadenopathy
Hepatosplenomegaly
Main investigations leukaemia
FBC - 1st line
Bone marrow biopsy - diagnostic
Blood film - to look for abnormalities
Leukaemia associated with Down’s syndrome
ALL
4 complications of chemotherapy
- Stunted growth and development in children
- Infertility
- Neurotoxicity
- Tumour lysis syndrome
Explain the pathophysiology of congenital adrenal hyperplasia
- Deficiency of 21-hydroxylase enzyme
- 21-hydroxylase enzyme usually converts progesterone into aldosterone and cortisol = underproduction of aldosterone and cortisol
- unconverted progesterone = converted into testosterone = overproduction of androgens
Why does hypoglycaemia, hyponatraemia and hyperkalaemia occur in CAH
Low cortisol = Hypoglycaemia
Low aldosterone = Hyponatraemia, Hyperkalaemia
Why does skin hyperpigmentation occur in CAH
Anterior pituitary responds to low cortisol by increasing ACTH
By product of ACTH = melanocyte stimulating hormone
Characteristics of CAH in cases presenting later in childhood
Tall for age
Deep voice
Early puberty
Females: absent periods, facial hair
Males: large penis, small testicles
CAH management
Corticosteroids:
Hydrocortisone (CORTISOL replacement)
Fludrocortisone (ALDOSTERONE replacement)
Female patients with virilised genitalia may require corrective surgery
Risk factors for further febrile convulsions
Age of onset < 18 months
Fever < 39
Shorter duration of fever before the seizure
FHx of febrile convulsions
Features of a simple febrile seizure
Generalised tonic clonic seizure
Lasts less than 15 mins
Only occur once during a single febrile illness
management following febrile convulsion
Treat underlying cause (usually viral or bacterial infection)
Reassurance and parental education
Complex - further investigation
Eye muscle controlled by cranial nerve 6 (abducens) and action
Lateral rectus
‘ABDuction’ = “out”
Eye muscles controlled by cranial nerve 3 (oculumotor) and action
Medial rectus - adduction
Superior rectus - elevates + turns medially
Inferior rectus - depresses + turns medially
Inferior oblique - elevates + turns laterally
Eye muscle controlled by cranial nerve 4 (trochlear) and action
Superior oblique
Depresses :( and turns laterally “down” :(
Other than “down and out” in a third nerve palsy, name 2 other presentations (usually indicating a ‘surgical’ cause of compression against the 3rd nerve)
Ptosis (levetor palpebrae superioris is not innervated)
Dilated fixed (non-reactive) pupil (parasympathetic nerves of iris sphincter not innervated)
Name 4 causes of a third nerve (oculomotor) palsy
Microvascular (diabetes, HTN, ischaemia)
Tumour
Cavernous sinus thrombosis
Posterior communicating artery aneurysm
Types of microcytic anaemia
TAILS
Thalassaemia
Anaemia of chronic disease
Iron deficiency anaemia
Lead poisoning
Sideroblastic anaemia