Paeds 1 - Cardio/Resp/GI/Infections etc Flashcards
list some ways congenital heart disease might present
- antenatal diagnosis by US
- heart murmur
- cyanosis
- shock (low cardiac output)
- cardiac failure
what are the most common left to right shunting congenital heart lesions?
- VSD
- PAD
- ASD
present BREATHLESS (acyanotic)
what are the most common right to left shunting congenital heart lesions?
- tetralogy of fallot
- transposition of the great arteries
present BLUE (cyanotic)
which congenital heart lesion involves common mixing of oxygenated and deoxygenated blood?
aka - breathless and blue
- AVSD
give the two main causes of outflow obstruction in a well child
aka - murmur, but asymptomatic
pulmonary stenosis
aortic stenosis
give the main cause of outflow obstruction in a sick neonate
aka - collapsed with shock, as opposed to well but with a murmur
coarctation of the aorta
what are the features of an innoSent murmur - the 5 S’s
Soft blowing Systolic only (not diastolic) aSymptomatic left Sternal edge normal heart Sounds
explain the normal circulatory changes that occur at birth
with the first breath, the resistance to pulmonary blood flow falls and the volume of blood going through the lungs increases.
leads to a change in pressure making the foramen ovale close.
the ductus arteriosus (connects pulmonary artery to aorta) will usually close within first few hours/days - some babies rely on this duct to allow mixing of the blood if they have a defect, and will rapidly deteriorate once it shuts!
when does the foramen ovale close?
at first breath - resistance to pulmonary blood flow falls, volume of blood going through lungs increases, change in pressure leads to closure of foramen ovale
when does the ductus arteriosus close?
within first few hours/days - babies that were relying on mixing via ductus arteriosus may rapidly deteriorate once it shuts!
what symptoms might indicate a baby is in heart failure?
breathlessness - especially on feeding (/exertion)
sweating
poor feeding
recurrent chest infections
what signs might indicate a baby is in heart failure?
failure to thrive / faltering growth tachypnoea, tachycardia hepatomegaly cool peripheries heart murmur, gallop rhythm (third heart sound)
give some causes of cardiac failure in a neonate
in neonates heart failure is usually due to obstructed systemic circulation (will be duct-dependent):
- hypoplastic left heart
- critical aortic valve stenosis
- severe coarctation of the aorta
- interruption of the aortic arch
give some causes of cardiac failure in an infant
in infants heart failure is due to volume overload (‘high pulmonary blood flow’):
VSD
AVSD
large PDA
if you suspect a neonate/infant is in cardiac failure, what investigations would be useful?
CXR - expect to see enlarged heart and pulmonary congestion (useful if unsure if resp v cardio issue)
ECG
Echocardiography to determine the underlying defect
give some causes of cardiac failure in a child/adolescent (i.e. not a baby!)
will see R or L heart failure.
Eisenmenger syndrome (R heart failure only)
Rheumatic heart disease
Cardiomyopathy
what causes persistent cyanosis in an otherwise well infant?
some kind of structural heart disease
what (broadly) might be causing cyanosis in a newborn infant with respiratory distress?
cardiac - the cyanotic congenital defects
resp - surfactant deficiency, meconium aspiration, pulmonary hypoplasia
persistent pulmonary hypertension of the newborn (PPHN)
infection - septicaemia from Group B strep (+ other organisms)
metabolic diseases - metabolic acidosis and shock
what is persistent pulmonary hypertension of the newborn (PPHN)?
failure of the pulmonary vascular resistance to fall after birth - pressure in pulmonary vessels remains high, preventing blood flow and limiting oxygenation of the blood -> leads to cyanosis
what investigations might you order to distinguish between causes of cyanosis/heart failure if echo is unavailable?
CXR + ECG
pre and post ductal sats (a difference indicates PPHN or R->L shunting)
4 limb BP (upper and lower limbs will be different in coarctation of the aorta)
what are the two types of ASD?
most common = ostium secundum defect, high in atrial septum
must less common = ostium primum, occurs much lower - common in Downs
how do you distinguish between ASD and PFO?
PFO only open when atrial pressure/volume raised - present in 1/3 of kids with congenital heart disease.
ASDs are large and always open (although usually asymptomatic in childhood!)
what symptoms may be seen in ASD?
usually none!
might get recurrent chest infections/wheeze
in 30s onwards may get arrhythmias
what signs will be seen in ASD?
ejection systolic murmur at upper left sternal edge - increased flow across pulmonary value due to L -> R shunt
fixed and widely split S2
what is the key investigation for diagnosing any structural heart defect?
ECHO
management of ASD
if large, consider surgery (when age 3-5y) - to prevent cardiac failure/arrythmias later in life.
secundum defects often closed transcatheter.
what signs/symptoms might be seen if a baby has a small VSD?
asymptomatic!
signs - loud pansystolic murmur at lower L sternal edge, quiet pulmonary second sound (P2)
how would you investigate and manage a small VSD?
Ix - CXR and ECG will be normal, can be seen on echo
Rx - none, resolves spontaneously
what symptoms will be seen if a baby has a large VSD?
heart failure with breathlessness and faltering growth after 1 week old
recurrent chest infections
what signs will be seen if a baby has a large VSD?
tachypnoea, tachycardia, enlarged liver (heart failure signs)
active precordium (excessive movement of chest wall over heart)
soft pansystolic murmur/no murmur if v large defect
apical mid-diastolic murmur
what CXR signs would you expect to see in a large VSD?
cardiomegaly, enlarged pulmonary arteries, pulmonary plethora/strong pulmonary vascular markings, pulmonary oedema
what ECG findings would occur in ASD?
RVH + incomplete RBBB
what ECG findings would occur in a large VSD?
biventricular hypertrophy - would occur by 2 months old
how would you manage a baby with a large VSD?
diuretics and ACEi for heart failure
additional feeding/calories to grow them!
medium-sized defects often spontaneously close, but if there’s still a shunt at 4 years correct surgically before school starts
large defects - surgical correction at around 3-6 months.
what is Eisenmenger’s syndrome?
obstructive pulmonary vascular disease that occurs due to significant L to R shunt - the pulmonary hypertension due to the shunt leads to permanent damage of the vessels.
this can lead to pressures equalising and the direction of blood flow shifting to R to L (reversed shunting).
it’s really bad!
what is the ductus arteriosus and when does it normally close?
at what point would you diagnose PDA?
connects aorta to L pulmonary artery, normally closes by 4th day of life.
PDA diagnosed if not closed after 1 month of life.
give 3 risk factors for a PDA
preterm - although this is normal due to their prematurity
Downs
high altitude
how is a persistent PDA managed?
risk of pulmonary vascular disease or infective endocarditis is high - so surgical closure recommended.
usually done at 1 year. if diagnosed really early, ibuprofen (or indomethacin) may help close it without surgery, but typically surgical closure needed.
what clinical features would you see in PDA?
continuous machine murmur beneath the L clavicle.
collapsing/bounding pulse (due to wide pulse pressure)
always asymptomatic - unless really severe and then you’d get heart failure
how is a patent PDA (due to prematurity) managed?
(Indomethacin inhibits prostaglandin synthesis) oral/IV ibuprofen 10mg/kg, then 5mg/kg at 24 and 48hrs old
what are the four features of Tetralogy of Fallot?
- Large VSD
- Overriding aorta
- Pulmonary stenosis
- RV hypertrophy
how might tetralogy of fallot present?
- in first 1-2 months of life with hypoxic spells OR a murmur
- squatting on exercise in late infancy, due to hypoxic spells
- often picked up antenatally on scans
give the clinical signs of tetralogy of fallot
cyanosis ± clubbing (usually only in older kids)
loud and single S2
loud ejection systolic murmur maximal at lower L sternal edge
Delete
boot shaped heart! - RVH - concavity on L heart border where normally the main pulmonary artery and RV outflow tract would create a convexity - R sided aortic arch diminished pulmonary vascular markings
how is tetralogy of fallot managed?
corrective surgery at 6 months - close the VSD, relieve RV outflow obstruction
if severe, may require shunt formation in the interim
what is transposition of the great arteries?
aorta connected to R ventricle, pulmonary artery connected to the L ventricle
forms two parallel circulations, one of oxygenated blood and one of deoxygenated blood
this would be incompatible with life but defects exist allowing mixing e.g. VSD, ASD etc
how does transposition of the great arteries present?
profound cyanosis on first day or two of life - blue, sats <95%, collapsed
presents on day 2 due to closure of the ductus arteriosus which stops/reduces the mixing of the circulations
what signs would you see in transposition of the great arteries?
CYANOSIS - always.
loud S2
no murmur (unless VSD/PDA causing one)
how is transposition of the great arteries managed?
need to improve the mixing of circulations
prostaglandin (PG) E1 infusion to reopen ductus arteriosus
emergency balloon atrial septostomy via catheter is life-saving
corrective surgery performed at a few weeks of age (you basically just cut the great arteries and swap them over)
what is a complete AVSD?
defect in middle of heart with single 5 leaflet valve between atria and ventricles - stretches across entire AV junction and tends to leak.
when would most likely see a complete AVSD?
Downs syndrome
typically diagnosed antenatally on ultrasound.
how does a complete AVSD present?
antenatally on US
cyanotic at birth, or heart failure at 2-3 weeks
how is a complete AVSD managed?
diuretics/ACEis for heart failure
surgery at 3-6 months
what is tricuspid atresia?
defect where only the L ventricle works - R is small and non functioning.
there’s ‘common mixing’ of oxygenated/deoxygenated blood in the L atrium
how does tricuspid atresia present?
with cyanosis in newborn period, after the ductus arteriosus closes
how is tricuspid atresia managed?
surgically - palliative as there is no completely corrective surgical option
what are the two main causes of outflow obstruction in a well child?
aortic stenosis, pulmonary stenosis
what is aortic stenosis (paediatric) and how does it present?
partly fused aortic valve leaflets.
presents with asymptomatic ejection systolic murmur at upper R sternal edge that radiates to neck
how is aortic stenosis managed?
if surgery needed - balloon valvotomy, possibly valve replacement in long term
before surgery/if no surgery needed, advise to avoid strenuous exercise
what is pulmonary stenosis and how does it present?
partly fused pulmonary valve leaflets.
presents with asymptomatic ejection systolic murmur at upper R sternal edge
how is pulmonary stenosis managed?
surgery - transvenous balloon dilatation or pulmonary valvotomy
what are the three main causes of outflow obstruction in a sick infant?
coarctation of the aorta
interruption of the aortic arch
hypoplastic left heart syndrome
what is the general presentation of an infant unwell due to obstructive lesions?
really sick with heart failure and shock in neonatal period, unless lesion was diagnosed antenatally
what are the general principles of managing a neonate unwell due to obstructive lesions?
ABC resuscitation is key!
early prostaglandins
refer for early surgical intervention
what is coarctation of the aorta?
arterial duct tissue encircling the aorta just at the point of insertion of the ductus arteriosus - when this shuts, the aorta also constricts causing severe obstruction of LV outflow
what are the clinical features of coarctation of the aorta?
normal exam on day 1.
then acute circulatory collapse on day 2 (after ductus closes!)
really sick baby, severe heart failure, absent femorals, severe metabolic acidosis.
how is coarctation of the aorta managed?
once diagnosed, give a prostaglandin infusion to maintain ductal patency and transfer to cardiac centre for surgery ASAP
what is interruption of the aortic arch?
there’s no connection between proximal aorta and aorta distal to the ductus arteriosus - cardiac output relies on R to L shunt via duct.
normally a VSD as well.
how does interruption of the aortic arch present?
shock as a neonate.
associated with DiGeorge syndrome (22q 11.2)
how is interruption of the aortic arch managed?
complete correction in first days of life
what is hypoplastic left heart syndrome and how is it managed?
complete underdevelopment of entire L side of heart, detected at antenatal US.
surgery called Norwood procedure + further 2 surgeries.
what is the only common paediatric cardiac arrhythmia?
can you name any others?
supraventricular tachycardia
others - congenital complete heart block, long QT syndrome
what is supraventricular tachycardia and how does it present in children?
HR >220bpm, often up to 300bpm
typically asymptomatic, but infants may have heart failure - ensure an echo is done to rule out structure defects.
what would you see on an ECG of a child with a supraventricular tachycardia?
narrow complex tachycardia - P waves discernible after QRS complex.
how is an acute episode of supraventricular tachycardia managed?
to restore sinus rhythm:
- vagal stimulation - ice cold compress to face, carotid sinus massage
- IV adenosine bolus - safe and effective
DC cardioversion only if the above fail.
what is rheumatic fever?
abnormal immune response to a preceding group A beta-haemolytic strep infection
v rare in developed world!
what are the clinical features of rheumatic fever?
polyarthritis, fever and malaise 2-6 weeks after pharyngeal infection.
arthritis is fleeting - lasts less than a week in individual joints (tends to affect knees and ankles)
50% of patients have pancarditis:
- pericarditis - friction rub and pericardial effusion
- endocarditis - murmurs
- myocarditis - heart failure
erythema marginatum (pink macules on trunk and limbs) = uncommon, painless, early
Modified Duckett Jones criteria used to diangose
how is rheumatic fever managed?
bed rest and aspirin (suppresses fever and arthritis).
monthly IM ben pen is prophylactic
what is the main potential complication of rheumatic fever?
number one cause of valvular disease world wide! usually mitral valve - scarring and fibrosis.
when might you suspect infective endocarditis?
children with congenital heart disease are at risk, but suspect in anyone with: sustained fever malaise raised ESR unexplained anaemia or haematuria
any kid with fever and significant cardiac murmur - think IE
what are the clinical features of infective endocarditis?
fever malaise anaemia/pallor splinter haemorrhages clubbing neurological signs from cerebral infarct/CNS abscess haematuria - glomerulonephritis arthritis
how is infective endocarditis diagnosed?
combo of clinical and lab:
- blood cultures - take 3+ within first 24h in hospital
- echo to confirm presence of vegetations
- raised ESR (useful for monitoring treatment)
strep viridans (alpha haemolytic strep) is most common cause
how is infective endocarditis treated?
high dose penicillin and an aminoglycoside - 6 weeks IV
Environmental risk factors of respiratory infections in children: (3)
Personal & medical risk factors: (4)
- Parental smoking (esp maternal)
- Low SE status (large family, overcrowded, damp housing)
- Poor nutrition
- Male
- Congenital heart disease
- Immunodeficiency
- Underlying lung disease (bronchopulmonary dysplasia, CF, asthma)
what are the different most common causes of a wheezy child, by age group?
0 - 12m = bronchiolitis
12m - 3y = viral induced wheeze
3y+ = asthma (probably)
give the common URTIs in kids
common cold (coryza)
sore throat (pharyngitis, tonsillitis)
acute otitis media
sinusitis (relatively uncommon)
A kid with URTI. What complications might they present with?
- Dehydration (difficulty feeding in infants (blocked nose obstructs breathing during feed))
- Febrile convulsions
- Acute asthma exacerbations
what are the ‘coryzal’ symptoms?
clear/mucopurulent nasal discharge and nasal blockage
what viruses typically cause coryzal symptoms
rhinoviruses, coronaviruses, RSV
what is the clinical picture of pharyngitis and what typically causes it?
inflamed pharynx and soft palate, enlarged and tender lymph nodes.
usually viral - adenoviruses, enteroviruses, rhinoviruses.
older child - might by group A beta haemolytic strep
what is tonsillitis?
a form of pharyngitis with inflamed tonsils +/- purulent exudate
what are the usual causative organisms in tonsillitis? how do you distinguish between viral and bacterial?
typically viral (rhinovirus, coronavirus, parainfluenza etc)
might see EBV (infectious mononucleosis), group A beta haemolytic strep
hard to distinguish clinically - more severe systemic symptoms in bacterial (headache, apathy etc)
what treatment is often given for bacterial tonsillitis?
penicillin
erythromycin if allergic to penicillin
avoid amoxicillin as can cause a rash if it’s EBV
when might you admit a patient for tonsillitis?
if difficulty swallowing - give IV fluids and analgesia
what is acute otitis media and who gets it?
middle ear infection
most common at 6-12 months age due to their short, horizontal Eustachian tubes
what are the clinical features of acute otitis media?
pain in ear and fever - examine tympanic membranes of any kid with fever!
what would the tympanic membranes look like in a kid with acute otitis media?
bright red and bulging, loss of normal light reflection.
might see acute perforation - pus in external canal.
recurrent otitis media –> scarring of tympanic membrane
give some common causative organisms of acute otitis media
RSV, rhinovirus, pneumococcus, H. influenza, Moraxella catarrhalis
how would you manage acute otitis media?
pain - regular paracetamol/ibuprofen
amoxicillin can shorten duration - prescribe, ask parent only to use if still unwell after 2-3 days
what is glue ear and how does it present?
recurrent ear infections that have led to otitis media with effusion (OME)
often asymptomatic, may have reduced hearing - usually in a 2-7yo kid
what would you see down the otoscope if a child has glue ear/OME?
eardrum dull and retracted, visible fluid level
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how is glue ear managed?
generally resolves spontaneously
Grommet insertion if conductive hearing loss impacting speech development/school
what type of hearing loss is seen in glue ear?
conductive
what is the clinical picture of sinusitis in a child?
concurrent viral URTI, possibly a secondary bacterial infection - pain/swelling/tenderness over cheek
how might you manage a child with sinusitis?
abx if you suspect bacterial cause.
analgesia, topical decongestants
what are the characteristic features of a laryngeal/tracheal infection? what is the major risk with these?
stridor, hoarseness, barking cough, dyspnoea (variable degree)
risk of airway obstruction!!! DO NOT EXAMINE THE THROAT
what is stridor?
rasping sound, predominantly on inspiration
how do you assess degree of airway obstruction in a child with suspected croup/laryngeal or tracheal infection?
degree of chest retraction (none/only on crying/at rest)
degree of stridor (none/only on crying/at rest/biphasic)
DON’T EXAMINE THE THROAT
describe the basic acute management of upper airways obstruction in a child
- DO NOT EXAMINE THE THROAT
- observe for signs of hypoxia or deterioration
- consider oral dexamethasone or budesonide nebs before adrenaline
- if severe, use adrenaline nebs (bleep anaesthetist in case you have to intubate)
what’s the fancy name for croup?
laryngeotracheobronchitis
explain the pathology of croup
mucosal inflammation and increased secretions affect the airway - subglottic area oedema is the dangerous bit that can obstruct
what are the causative organisms of croup?
95% viral (parainfluenza most common, or human metapneumovirus, RSV, influenza)
who gets croup and when?
kids age 6m - 6y (peak @ 2y).
typically in autumn and spring.
how does croup present?
barking cough, hoarseness, harsh stridor - all worse at night.
preceded by fever and coryza.
how do you manage a kid with croup presenting with mild obstruction, no stridor, plus chest recession?
home care, with close observation by parent - supportive care as it’s self-limiting
how do you manage a kid with serious croup - stridor etc
ITU, oral dexamethasone (squirt into mouth with syringe), nebulised budesonide (adrenaline nebs if gets v bad), possible need to intubate.
supportive care - protecting airway - as it’s self-limiting
what is bacterial tracheitis?
similar to croup, but bacterial - very rare but dangerous!
Staph. aureus
how does bacterial tracheitis present?
similar to croup but with high fever - child appears toxic, with rapidly progressing airways obstruction and thick secretions
how do you treat bacterial tracheitis?
IV abx ± intubation ± ventilation