This document discusses technical issues in breast radiotherapy. It covers immobilization methods like breast boards and vac-locks to position patients. It describes how to determine field borders and angles for tangential fields. It also discusses treatment of regional lymph nodes like supraclavicular and internal mammary nodes. Techniques for breast conservation therapy like electron boosts and interstitial brachytherapy are covered. Guidelines for contouring regions like the breast and lymph nodes on CT scans are provided. The role of newer techniques like IMRT in breast radiotherapy is also summarized.
EBCTCG METAANALYSIS
INDICATION OF POST OP RADIOTHERAPY
Immobilization devices
Conventional planning
Alignment of the Tangential Beam with the Chest Wall Contour
Doses To Heart & Lung By Tangential Fields
EBCTCG METAANALYSIS
INDICATION OF POST OP RADIOTHERAPY
Immobilization devices
Conventional planning
Alignment of the Tangential Beam with the Chest Wall Contour
Doses To Heart & Lung By Tangential Fields
This seminar is presented as a part of weekly journal club and seminar presented in Apollo Hospital,Kolkata Department of Radiation Oncology.This seminar is moderated by Dr Tanweer Shahid.
A review of advances in Brachytherapy treatment planning and delivery in last decade or so, with main focus on brachytherapy for Prostate cancer, Breast cancer and Cervical cancer
This is a made easy summary of ICRU 89 guidelines for gynecological brachytherapy. Extra practical questions for MD/DNB Radiotherapy exams are also attached.
Management of cacrinoma cervix: Techniques of radiotherapy (2D conventional, 3D Conformal radiotherapy (3DCRT) and IMRT with a review of various contouring guidelines.
This seminar is presented as a part of weekly journal club and seminar presented in Apollo Hospital,Kolkata Department of Radiation Oncology.This seminar is moderated by Dr Tanweer Shahid.
A review of advances in Brachytherapy treatment planning and delivery in last decade or so, with main focus on brachytherapy for Prostate cancer, Breast cancer and Cervical cancer
This is a made easy summary of ICRU 89 guidelines for gynecological brachytherapy. Extra practical questions for MD/DNB Radiotherapy exams are also attached.
Management of cacrinoma cervix: Techniques of radiotherapy (2D conventional, 3D Conformal radiotherapy (3DCRT) and IMRT with a review of various contouring guidelines.
A mammography, or mammogram, is an X-ray of the breast. It's a screening tool used to detect and diagnose breast cancer. Together with regular clinical exams and monthly breast self-examinations, mammograms are a key element in the early diagnosis of breast cancer.
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
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
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
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
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6. Several adjustable features to allow for the manipulation of
patients arms, wrists, head and shoulders.
To make chest wall surface horizontal, brings arms out of the way
of lateral beams.
Arm abducted at 90⁰ & hand holds handle of arm rest.
Face turned towards opposite side.
Thermoplastic breast support can be added.
Constructed of carbon fiber which has lower attenuation levels
permitting maximum beam penetration.
10. FOR TANGENTIAL FIELDS
Upper border – 2nd ICS (angle of Louis) when supra
clavicular field used.
When SCF not irradiated – head of clavicle
Medial border – at or 1cm away from midline
Lateral border – 2-3cm beyond all palpable breast
tissue – mid axillary line
Lower border – 2cm below inframammary fold
Anterior -2cm margin of light, above the highest point of
breast.
11. A pectoralis major
muscle
B axillary lymph
nodes: levels I
C axillary lymph
nodes: levels II
D axillary lymph
nodes: levels III
E supraclavicular
lymph nodes
F internal
mammary lymph
nodes
12.
13. HOW TO IMPLEMENT IT?
Deciding angle of rotation of gantry for tangential
fields:
Lead wire placed on lateral border
Field opened at 0⁰ rotation on chest wall and
central axis placed along medial border of marked
field
Gantry rotated , until on fluoroscopy, central axis &
lead wire intersect – angle of gantry at that pt.
noted – medial tangent angle
14. CENTRAL LUNG DISTANCE
Perpendicular distance from post. tangential field
edge to post part of ant. chest wall at centre of field
Best predictor of %age of ipsilateral lung vol.
treated by tangential fields
CLD (cm) % of lung
irradiated
1.5 cm 6%
2.5 cm 16%
3.5 cm 26%
20. SCF
Single anterior field is used.
Field borders –
Upper border : thyrocricoid groove
Medial border : at or 1cm across midline extending
upward following medial border of SCM ms to
thyrocricoid groove
Lateral border: insertion of deltoid muscle
Lower border : matched with upper order of
tangential fields
21. A pectoralis major
muscle
B axillary lymph
nodes: levels I
C axillary lymph
nodes: levels II
D axillary lymph
nodes: levels III
E supraclavicular
lymph nodes
F internal
mammary lymph
nodes
SUPRACLAVICULAR-AXILLARY FIELD
22. Humeral head shielding:–
• If arm angled >90⁰: Ax nodes overlap head of
humerus anteriorly.
• Larger the angle – less the head of humerus
spared in s.c port
24. Angulation
By inferior angulation of the
tangential fields.
Half beam block technique
Blocking the supraclav field’s
inferior half, eliminating its
divergence inferiorly .
Hanging block technique
Superior edge of tangential beam
made vertical by vertical
hanging block.
25. Single isocentre technique:
• Isocentre placed at the junction
of tangential and supraclavicular
field
• Inferior portion of field blocked for
supraclavicular treatment and
superior portion blocked for
tangential field
27. 1. Extension of tangential fields– by extending medial
border – 3cm across midline or by using imaging
techniques
2. Separate field –
• Medial border – midline , matching with tangential
field border
• Lateral border – 5-6cm from midline
• Superior border – abuts inferior border of supraclav
field or at 1st ICS (superior border of head of clavicle)
if only IMNs are to be treated
• Inferior border – at xiphoid or higher if 1st three ICS
covered
28. More normal tissue is being irradaited. (lung, heart and
contralateral breast)
33. Medial border – To allow
1.5-2cm of lung on the
portal film
Inferior border –
at same level of inferior
border of s.c field
Lateral border – just blocks
fall off across post axillary fold
Superior border – splits the clavicle
Superolaterally – shields or splits humeral head
Centre – at acromial process of scapula
35. BOOST-ELECTRONS
Appropriate energy selected to allow 85 -90%
isodose line to encompass target volume &
decrease dose to the lung.
Clinical set up - post lumpectomy volume or scar
on skin +3 cm in all directions.
Energy – 9-16 MeV
Dose – 10-20Gy
40. •Useful for voluminous breast
•For patients who are heavy smoker and previous
history of lung or cardiac disease
•For deep seated tumor
Disadvantage – For nodal RT treatment position
has to be changed
45. Reduces the hotspots specially in the superior and
inframammary portions of the breast.
Increases homogenity
Manifests clinically into decrease in moist
desqumation in these areas.
46.
47. IMRT BREAST: WHY?
(1) Better dose homogeneity for whole breast RT
(2) Better coverage of tumor cavity
(3) Feasibility of SIB
(4) Decrease dose to the critical organs
(5) Left sided tumors- decrease heart dose
64. When the CTV extends deeper
than 28 mm under the epidermal
surface, implants have a higher
ballistic selectivity in terms of the
volume of the irradiated breast
tissue and dose to the skin blood
vessels than electron beam
boosts.
65. LOCALIZATION OF LUMPECTOMY CAVITY
Pre-op clinical finding , pictures
Imaging- mammogram,usg,MRI
Per-op finding
HPR
Surgical clips
Post op imaging with USG,CT or MRI
66. Use of marker clips to
localise the boost
target volume and
simulate entrance
points of guide needle
at the skin of the breast
67. Use of mammography in defining
the boost target localisation in
breast conserving treatment
68. A. Defining the implantation isocentre and definitive needle entrance
and exit points at the skin for a breast implant. Reconstruction boost
target isocentre from mammography, by simulator, or CT. The
indicated entrance points are too close to the target volume (A)
B. Inclination of the implantation equator plane away from the target to
avoid an overlap of the boost PTV and needle exit points at the skin
69. (C). Indication of new entrance and exit points, further away from
the boost CTV, to avoid skin teleangiectases .
(D)Occurrence of severe teleangiectasic ‘stars’ at skin entrance or
exit points if rules for implementation are not followed
Why this planning so important.
With a delivered dose of 50 Gy , chances of late teleangiectases
may occur in 30% of cases
Vessels may have already received 20–40 Gy from the breast
irradiation.Therefore, there is usually only a small dose amount left
in skin vessel tolerance for teleangiectases
70. ANAESTHESIA
Breast implants can easily be carried out under L.A. and
premedication with 2.5–5 mg midazolam given 15–30
min before the implantation.(GA, <0.5%)
The patient is placed in supine position with the
homolateral arm in 90° abduction.
After the design of implant geometry and localisation of
entrance and exit points of the needles, the skin is
infiltrated at each point with 0.5–1 ml 1% lidocaine.
Retroareolar region is painful (1-5 ml extra infiltrate in
that area)
71. DESIGN OF THE IMPLANT GEOMETRY
Needles are implanted parallel and equidistance from
each other (Paris system).
In most cases inserted in a mediolateral direction.
In very medially or laterally located tumor sites, needles
should be implanted in a craniocaudal direction .to
enable separate target area from skin points.
In some rare cases, the upper outer quadrant has to be
implanted with needles orientated in a 45° angle to
avoid overlap of source positions and skin
72.
73. 2 planes of needles are usually needed to cover the
PTV.
A single plane may be sufficient in case of a target
thickness of less than 12 mm.
Three planes are required in a large breast where
the targeted breast tissue between pectoral fascia
and skin is thicker than 30 mm.
Five to nine needles spaced 15–20 mm are usually
required.
74. Reference needle is first implanted at the posterior
(deepest) side into the centre of the PTV.
For definitive positioning, the needle should pass about
5 mm behind the internal scar.
The other needles of the posterior plane are then
implanted parallel to the first one.
For definitive positioning, the needle should pass about
5 mm behind the internal scar.
The other needles of the posterior plane are then
implanted parallel to the first one.