This document provides information on Down syndrome (DS), including its causes, genetics, clinical features, diagnostic tests, and risk factors. DS, also known as trisomy 21, is caused most commonly by non-disjunction resulting in a third copy of chromosome 21. It causes intellectual disability and physical features such as a flat facial profile, upslanted eyes, and loose skin at the neck. Diagnosis is usually based on clinical features and confirmed through karyotyping, FISH, or prenatal screening/diagnostic tests. The risk of DS increases with maternal age and for mothers who previously had a child with DS.
This presentation contains detailed knowledge about Down's Syndrome its types, clinical presentation, diagnosis, medical and physio therapeutic management of the condition.
Down syndrome is a condition in which a person has an extra chromosome. Chromosomes are small “packages” of genes in the body. They determine how a baby’s body forms and functions as it grows during pregnancy and after birth. Typically, a baby is born with 46 chromosomes. Babies with Down syndrome have an extra copy of one of these chromosomes, chromosome 21. A medical term for having an extra copy of a chromosome is ‘trisomy.’ Down syndrome is also referred to as Trisomy 21. This extra copy changes how the baby’s body and brain develop, which can cause both mental and physical challenges for the baby.
This presentation contains detailed knowledge about Down's Syndrome its types, clinical presentation, diagnosis, medical and physio therapeutic management of the condition.
Down syndrome is a condition in which a person has an extra chromosome. Chromosomes are small “packages” of genes in the body. They determine how a baby’s body forms and functions as it grows during pregnancy and after birth. Typically, a baby is born with 46 chromosomes. Babies with Down syndrome have an extra copy of one of these chromosomes, chromosome 21. A medical term for having an extra copy of a chromosome is ‘trisomy.’ Down syndrome is also referred to as Trisomy 21. This extra copy changes how the baby’s body and brain develop, which can cause both mental and physical challenges for the baby.
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Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
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Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
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2. Dysmorphology and Syndrome
Dysmorphology - study of abnormal body shape and
defects. { Dys= abnormal ; morph= shape }
Syndrome – recognizable pattern of dysmorphic signs
that have a common cause.
3. Introduction
Most common genetic cause of intellectual disability.
First described by John Langdon Down in 1866,
physician from England.
Incidence 1 in 800 worldwide. But incidence at
conception is twice that rate , which accounts for early
pregnancy losses.
Previously called as ‘Mongolism’ not used now.
4.
5. 1515 the painting “The Adoration of the Christ Child”.
6. Risk factors
1. Increased maternal age : older eggs have greater risk
of improper chromosomal division ( spindle fibres
deterioration ) causing Non disjunction.
>35 years. Risk is non linear
2. Mothers who already have a child with DS.
3. Parents who are carriers for translocation – can
pass it to baby. ( familial DS )
7. Genetics
First described by French doctor Jerome Lejeune in 1959.
Presence partial or complete third copy of chromosome 21.
200-300 genes in chromosome 21 together with other epigenetic
factors produce clinical features of DS.
Trisomy 21 occurs by
1. Non disjunction (95%)
2. Translocation (3-4 %)
3. Mosaicism ( 1-2 % )
4. Partial trisomy ( <1 % )
8. Non disjunction
95 % . Non familial.
Meiotic non disjunction ( free Trisomy )
47 chromosomes seen instead 46 { 47 ,XX/XY,+21 }
90% maternal non disjunction and 10 % paternal non
disjunction.
Risk increases with maternal age. Especially > 35
years.
10. Translocation
3-4 %
Robertsonian translocation between 21q and other
acrocentric chromosomes ( 13,14,15,21 and 22 ).
Can be denovo (75%) or inherited (25%) .
25% of these cases can be due to inheritance from a
balanced translocation carrier parent. So parental
evaluation is a must, if carrier high recurrence rate.
Usually called as “familial DS”.
13. Mosaic
1-2 %
the result of an early “trisomy rescue” or early
somatic non disjunction error.
Difficult to predict DS phenotype due to variable
percentage of mosaicism in different tissues.
Usually mildly affected.
14. Partial Trisomy
Duplication of the delimited segment ( a region ) of
chromosome 21.
Produce some extra copies but not all genes on
chromosome 21. [ 46, XY/XX, dup (21q) ]
If duplicated part have genes which produce features
of Down syndrome they will express in Phenotype.
Rare < 1 %
15.
16. Pathophysiology
Presence of extra genetic material causes over
expression of genes in chromosome 21 ( Dosage
Imbalance )
Length of 21 q is 33.5 Mb and 21 p is 5-15 Mb.
DS critical regions (DSCR) : few regions of
chromosome 21 is responsible for majority of DS
phenotype.
Mainly within 21q22 region.
17. Some common genes located in
chromosome 21
AAP ( Amyloid beta precursor protein ) implicated in
Alzheimer’s disease.
SOD 1 ( superoxide dismutase 1 )
DYRK1A ( Dual Specificity tyrosine – (Y)-
phosphorylation regulated kinase 1A )
S100B ( calcium binding protein )
DSCR 1 ( Down syndrome critical region 1 )
LAD ( Leukocyte Adhesion Deficiency )
KCNE 1 and 2 ( Potassium voltage gated channel )
CBS ( Cystathionine Beta synthase )
30. Dermatoglyphics in Down
syndrome
Digital and Palmar dermatoglyphics are considered.
No feature is alone diagnostic, because seen in
common population also.
But when several features are there, can be an
indicative of an associated syndrome.
31. 1. Excess ulnar loops
2. Radial loops mainly in 4th and 5th digit
3. Wide ATD angle
4. Simian crease
5. Digital loop between the base of the index finger &
middle finger / middle finger & ring finger opening to
inter digital space.
32. Tri radius
Point of convergence of 3 regions that separate almost
parallel ridges.
35. Simian and Sydney crease
Based on PTC and DTC
Simian – fusion of PTC and DTC
Sydney – very long PTC which crosses the whole width
of palm. DTC appears normal.
36. Why Dysmorphology important ?
Genetic Tests are mainly
1. Costly.
2. Time consuming.
3. Cannot be easily accessed in remote area limited
settings.
Physical examination is the most accurate initial
diagnostic tool in practise.
37. Diagnostic tests in DS
1. Prenatal diagnosis – screening test and invasive
diagnostic testing.
2. Post natal diagnosis.
Why need screening ? – frequency, increased maternal
age related risk, availability of diagnostic test.
ACOG : All pregnant women must be provided with
options of screening with less invasive method.
38. 1 st TM screening
Detection rate 82-87%
1. NT scan + soft markers
2. Maternal serum B- HCG level
3. PAPP-A level ( Pregnancy associated Plasma protein )
Plus “Maternal age related risk”
40. Combining 1 and 2nd TM screening detection rate is
95 % called “ integrated screening ”
Screening test are reported to have 5% FPR.
Confirmation is done by Invasive testing but
miscarriage risk is 0.5 -1 %
Chorionic Villus Sampling ( >11 weeks )and
Amniocentesis ( >16 weeks )
41. Karyotype analysis
99 % accurate
Metaphase karyotype G banding is done on fetal cells.
Other than Trisomy 21, other aneuploidy and Balanced
translocations can be detected.
Cost low
4 week time needed. Time consuming.
< 4 Mb ( sub microscopic ) deletions are missed.
42.
43.
44. SKY ( Spectral Karyotyping )
Painting 24 chromosomes with colours.
5 basic dyes used , mixed to produce various colours
(31colours )
Clinical use – 1. when origin of chromosome not clear
2. helps to identify parental origin
or carrier state without screening.
Limitation : detection within same chromosome
difficult. Resolution limit is 1-2 Mb and less than 1 Mb
cannot detected.
46. FISH
2 types –Interphase FISH ( simple uncultured blood)
and Metaphase FISH ( Karyotype FISH ).
Rapid turn around ( 1 week )
Fluorescent tagged centromere probes are used, so
signals appears as distinct dots.
Since large number of nucleus used in Interphase
FISH mosaicism is not missed.
<4 Mb deletions are noted.
47. Disadvantages of FISH
Since Interphase chromosomes are less dense so
diffuse signals may produced.
Translocations are missed so need karyotype
confirmation.
49. NIPT ( Non Invasive Prenatal
testing )
Cell free fetal DNA (cf DNA) circulating in maternal
blood is used for sequencing.
5-10 % of total cell free DNA in maternal plasma.
Increased during gestation age and rapid clearance
after delivery.
Looked for aneuploidy, extra chromosomes.
NIPT still considered as screening test and need
Invasive test for confirmation.
50.
51. Post natal diagnosis
Based on clinical features and followed by
confirmatory genetic tests.
Physical examination is the most accurate initial
diagnostic tool in practise.
Confirmatory test include Karyotype and FISH.
Followed by parental testing if indicated.
52. Risk assessment of next child with DS depends on
1. Maternal age related risk
2. Karyotype result of affected baby
3. Parental carrier status and translocation.