Archive for the ‘Paediatrics’ Category

New peds HO guide

Posted: June 6, 2013 by gerardloh in Paediatrics

Dear friends,

I have completed my latest peds HO Guide. Again, it is an early version which requires proof reading. Kindly assist me in this and correct me if I am wrong.

May this collection help you in your pediatrics posting. Will add on more topics when time permits in the near future. Right now, I’m off to A and E! Cheers

Additional notes by Dr Goh Kiam Seong

pedsho

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Examination of Newborn (Part 4: New Ballard Score)

Posted: February 3, 2012 by kiamseong in Paediatrics

Methods of determine gestational age

  1. Mother’s menstrual history – if accurate, it remains the best measure of gestational age but it depends on normal maternal physiology, accurate and reliable history.
  2. Prenatal ultrasonography – indirect method, by body part measurement (normal time & proportion of foetal growth rate). Highly accurate when performed in early gestation.
  3. Postnatal maturational examination (Ballard score estimation)– indirect method, based upon indicators of neuromuscular and physical maturation

Foetal maturation depends on variety of intrauterine experiences.

  • Stressful intrauterine experience – accelerate pulmonary, and neuromuscular rate of maturation but slowing foetal growth; Completely non-stress foetus – mature more slowly than average foetus
  • With accelerate foetal maturation à slowing foetal growth
  • With accelerate foetal growth à delay foetal maturation

Active and passive muscle tone

Muscle tone = slight constant tension of healthy muscles which contributes to a slight resistance to the passive displacement of a limb

  • Active muscle tone
    – assess motility, activity, efforts at righting oneself
    – affected by state of illness, recent maternal medication, acute perinatal compromise, level of alertness
    – therefore NOT CONSISTENTLY USEFUL to evaluate baseline neuromuscular maturity
  • Passive muscle tone – useful for evaluating maturational development of neonatal brain, regardless of infant’s state of alertness or level of wellness
    – Extensor tone
    – Flexor tone
  • Foetus lying primarily with limb extended in very early phase of development; gradually it assumes the progressive flex attitude.
  • This is true whether the development occurs in nursery or in utero, suggesting that flexion results from the maturation of CNS rather than compressive forces in uterus, i.e. flexion overcomes extension as maturation progresses.

Development of neuromuscular tone progresses in a caudocephalic and centripedal direction, i.e. lower extremities developed slightly ahead than upper extremities’ tone.

Assessing flexor tone

1.  Extensor stretch or passive flexion

  • Flexibility – degree of join can be flex – wrist angle (square window)

2.  Resistance to passive extension

i.        Rest on supporting surface (untested part of extremities)

ii.        Be sensitive to slight tendency to resist extension

iii.        Support thigh from sides

iv.        Avoid placing pressure/ touching flexor muscles

3.  Measuring the angles of recoil (to previously flexed position)

i.        Support upper arm

ii.        Preset extremities in flexion

iii.        Extend only momentarily

iv.        Avoid fatiguing flexors – not to remain in extended position in too long time

New Ballard Score

  • Ballard score estimation is indicated for all preterm infant (<37 weeks of gestation) or term infant clinically large/small.
  • Consists of 2 parts: (a) neuromuscular maturity (b) physical maturity
  • Score is estimated in unit “week”.

Neuromuscular maturity

Posture

Infant is placed supine, examiner wait until the infant settles to a relaxed & preferred position.

Square Window

Examiner straightens the infant’s fingers and applies gentle pressure on dorsum of hand.

Arm recoil

Examiner places his one hand beneath the infant’s elbow for support. Taking the infant’s hand, examiner quickly sets the elbow in flexion, and then momentarily extends the arm before release the hand. The angle of recoil is noted.

Remember to avoid fatiguing flexors!

Popliteal angle

Thigh place in infant’s abdomen with knee fully flexed, examiner gently grasp foot at side by one hand while supporting the thigh by others. Care not to exert pressure to the hamstring muscle, as it might interfere with their function. Leg is extended until a definite resistance to extension is appreciated.

If prenatally it is in flexed breech presentation might interfere this manoeuvre within 24-48 hrs of life, due to prolonged flexor fatigue. The test should be repeated once recovery had occurred.

Scarf sign

Examiner with one hand support the infant’s head in midline and infant hand just above the chest

The thumb of examiner other hand is placed on the elbow. The examiner nudges the elbow across the chest, feeling for resistance to extension of the flexor muscle about the shoulder girdle.

Hell to ear

Lower extremities flexed at hip so that it rests on the mattress alongside of infant’s trunk. Examiner holds the infant’s thigh alongside the body with the palm of the hand avoiding pressure on hamstring; the other hand is used to grasp the sides of heel toward the ipsilateral ear. Using the infant’s heel as an indicator, examiner feels the resistance to extension of the pelvic girdle flexors by noting the point of the body where significant resistance is appreciated.

Source: www.ballardscore.com

Examination of Newborn (Part 1)

Posted: February 2, 2012 by kiamseong in Paediatrics

Respiratory Distress in Newborn

Posted: January 2, 2012 by kiamseong in Paediatrics, Uncategorized

The followings are the slides prepared by us for HO teaching presentation in HTAR, Klang. (Links for download)

Enjoy! =)

Part 1

Part 2

Part 3

Confused with different ventilators in NICU/PHDU?

Posted: January 2, 2012 by kiamseong in Paediatrics

Let’s understand the basic principal of functioning of ventilators in your NICU/PHDU.

Assist-control ventilation (Maquet ventilator/ IPPV – Drager ventilator)

  • Regardless ventilator/patient initiates breath, every breath the same (operator set tidal volume and minimal ventilator rate)
  • Ventilator just functions to compensate patient’s effort
    • Time cycled ventilator
      • Tidal volume and Resp rate set + Time set
      • Maquet (Siemen)/ Drager ventilator
    • Volume cycled ventilator
      • Tidal volume and Resp rate set + Flow set
      • Puritan-Vennett Bear ventilator
Advantage Disadvantage
  • Relative simple to set
  • Guarantee minimum ventilation

 

  • No synchrony between patient-ventilator, ventilator initiate come on top
  • Patient may lead ventilator
  • Inappropriate trigger è hiccough
  • Fall in lung compliance => risk of barotrauma
  • Require sedation to achieve synchrony

Pressure control ventilation

  • Time cycled assisted control ventilation in which inspiratory pressure is set instead of tidal volume
  • High initial flow => fall to zero by end of inspiration
  • Inspiratory pause is effectively built into the breath
  • Tidal volume not set if inspiratory time short then tidal volume lower

Synchronized Intermittent Mandatory Ventilation (SIMV)

  • Patient receives a set number of mandatory breaths, synchronized with any attempts by the patient to breath
  • Patient can take additional breath between mandatory breaths (pressure supported)
  • For improve patient-ventilator synchrony

Advantage Disadvantage
  • Better patient-ventilator synchrony
  • Guarantee minimum minute ventilation
Complicated

Continuous Positive Airway Pressure (CPAP)

  • Constant pressure both inspiratory and expiratory phase -> splint open alveoli, therefore to decrease shunting
  • Inspiration initiate from baseline pressure and airway pressure decrease to baseline at the end of respiration
  • Patient controls rate and tidal volume himself (totally dependent on patient’s inspiration effort)
  • Allow spontaneous breathing at an elevated baseline pressure

Non-invasive PPV – without invasive artificial airway (Endotracheal tube/ETT)

  • Due to face mask seal not perfect, usually use with ventilator (BiPAP) to provide some degree of compensation for leaks around the mask
  • Require patient to be alert, cooperate, able to protect his airway, haemodynamically stable
  • Low level of support initially then gradually increase to improve patient tolerance
  • BiPAP = pressure support + PEEP
    • Inspiratory pressure = 8-10 cmH2O
    • Expiratory pressure = 4-6 cmH2O
  • Effective for patient with chronic obstructive airway diseases/ cardiogenic pulmonary oedema
  • Less effective for pneumonia/ARDS