endocrine system by dr.a.r..joshi
TRANSCRIPT
Endocrine system
Dr. A.R. Joshi
Professor of Physiology
Control systems of body Nervous control Quick action,short duration
Hormonal control Slow action,long duration
Hormone
A chemical messenger,protein/polypeptide or steroid,secreted by ductless gland,directly poured in blood and acts on target organ.
Types of hormones General
Local Paracrine Autocrine
Thyroid hormones T 3
T 4
Thyrocalcitonin
Actions of T 3 and T 4 Metabolic actions- General cellular Carbohydrate Protein Fat Cholesterol
Actions of T 3 and T 4…cont Systemic actions- CVS RS GIT Bone marrow Reproductive CNS
Regulation of T 3 and T 4 TSH from ant pituitary
Blood iodine level
Climatic temperature
Hyperthyroidism Intolerance to warmth Weight loss Exophtholmos Tremors Tachyrrhythmia Secondary diabetes
Intolerance to cold Weight gain Non pitting oedema Bradycardia Atrophy of gonads Sluggish mental activity
Myxoedema
Cretinism Delayed mile-stones
Stunted growth
Mental retardation
Repeated infections
T 3 and T 4 levels TSH levels Radioactive iodine uptake Serum cholesterol Specific tests
Thyroid function tests
Mechanism of action of insulin
Acts on membrane receptor Stimulates protein kinase enzyme Makes Glut4 protein available Carrier mediated diffusion of
glucose Glucose moves inside the cell Blood glucose level reduced
Carbohydrate metabolism
Glucose made available inside cell
Glycogenesis stimulated
Glycogenolysis inhibited
Gluconeogenesis inhibited
Protein metabolism Amino-acids move inside the cell Protein synthesis stimulated Cellular growth stimulated Tissue repair stimulated Catabolism prevented
Fat metabolism Lipogenesis stimulated
Lipolysis inhibited
Regulation of insulin Regulated by blood glucose level Increase in blood glucose increases insulin secretion Secretion occurs in 2 phases Rapid phase Delayed phase
Hormonal regulation of BGLInsulin group Insulin decreases
blood glucose level
Anti-insulin group Glucagon T3 and T4 Glucocorticoids Catecholamines Growth hormone ( They increase blood
glucose level )
Diabetes mellitus Juvenile DM
Maturity onset DM IDDM (Type 1 ) NIDDM (Type 2 )
Secondary DM
Metabolism in DM Hyperglycemia and glycosuria Increased catabolism Lipolysis stimulated FFA are burned by beta oxidation Ketone bodies formed Ketoacidosis and coma
Detection of DM Urine examination Blood glucose level Fasting P P P G ( OGTT ) G T T Glycated Hb
Management of DM Diet Exercise Drugs Insulin injections Oral anti-diabetic drugs
Adrenal hormonesAdrenal cortex Aldosterone
Gluco-coticoids
Sex hormones
Adrenal medulla Adrenaline
Nor-adrenaline
Dopamine
Gluco-corticoids Metabolic actions Increase in BSL,AA & FFA Systemic actions CVS,RS,Bone marrow,GIT,Renal, Musculo-skeletal & CNS
Pharmacological actions…. Anti-inflammatory
Anti-allergic
Anti-stress
Immuno-suppressive
Side effects of gluco-corticoids Reduced immunity Secondary DM Hypertension Hyperacidity Osteoporosis Retaintion of salt and water
Actions of catecholamines Increase in HR and BP Broncho-dialatation Decreased GIT motility & secretions Relaxation of bladder Rise in BSL & FFA level Pupillary dilatation CNS stimulation
Uses of adrenaline Sudden cardiac arrest
Acute bronchial asthma
Anaphylactic shock
Role of dopamine Relation with schizophrenia
Relation with parkinsonism
Drug of choice in hypovolemic shock
Relation with vomiting center
Polycystic ovary syndrome ( Hyper androgenic anovulation )
Incidence – 5% to 10%
Age – 18 to 44 years
PCOS……symptomatology Irregular or no menstruation Excess body or facial hairs Acne Pelvic pain Infertility
PCOS……aetiology Familial tendency Sedentary life style High faty,salty & rich carbohydrate
diet Associated obesity Associated type 2 DM
PCOS……diagnostic triad No ovulation
High androgen level
Ovarian cysts
PCOS…….. management Lifestyle modifications Physical exercise to reduce weight Diet restrictions OCP for regularization of cycles Metformin Anti-androgen drugs
Infertility…….. causesMales Mumps Undescended testis STDs Exposure to high
temperature Heavy metal toxicity Systemic illnesses Endocrinal
abnormalities
Females Anovulation TB of endometrium Tubal block Uterine abnormalities Mumps STDs Systemic illnesses Endocrinal
abnormalities
Infertility…..investigations Semen examination Endometrial biopsy Hystero-salpingo-graphy USG Laproscopic examination Special tests
Infertility…..management Treat the basic cause Drugs to stimulate gamatogenesis Surgical procedures Artificial insemination from sperm
bank Invitro-fertilization Surrogate mother
Role of ayurveda…. Early prediction by study of prakruti Measures to modify membrane
responses Long term medication without side
effects Modification of hypothalamo- hypophysial-gonadal axis
For assistance in Clinical Physiology
Dr. A.R. Joshi Professor of Physiology (mobile :+919423523322) email: [email protected]