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Clinical examination of the thyroid PowerPoint Presentation

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Clinical examination of the thyroid Presentation Transcript

Slide 1 - Clinical examination of the thyroid Hugo R K Lisbôa, MD, Ph.D. Medical College University of Passo Fundo - RS BRAZIL
Slide 2 - Objectives of this lecture To evaluate the usefulness and limitations of the physical examination on the diagnosis of thyroid diseases according to concepts of clinical epidemiology
Slide 3 - Lesions recognizable through physical examination Classification of Nontoxic Goiter Nontoxic diffuse goiter Endemic (iodine deficiency, goitrogens). Sporadic {congenital defects, chemical (lithium)} Compensatory (following partial thyroidectomy) Nontoxic nodular goiter Uni or multinodular Functional and non functional
Slide 4 - Thyroid diseases 50% of people in the community have microscopic nodules 3.5% have occult papillary carcinoma, 15% have palpable goiters 10% demonstrate an abnormal thyroid-stimulating hormone level 5% of women have overt hypothyroidism or hyperthyroidism
Slide 5 - Prevalence of the most common thyroid diseases Diffuse endemic goiter : Depends on iodine supply.(The term endemic goiter is used when thyroid enlargement is found in more than 10% of the population). Nodular goiter: Up to 5% everywhere. Increases with age and iodine deficiency Thyroid cancer: average annual incidence of all types of thyroid cancer was 37.0 cases/1,000,000 population
Slide 6 - Incidence of Hypo and Hyperthyroidism (Whickham Cohort) The mean incidence (with 95% confidence intervals) of spontaneous hypothyroidism in women was 3.5/1000 survivors/year (2.8-4.5) and in men was 0.6/1000 survivors/year (0.3-1.2). The mean incidence of hyperthyroidism in women was 0.8/1000 survivors/year (0.5-1.4) and was negligible in men
Slide 7 - History The clinical examination of the thyroid is a powerful tool for the diagnosis of the most comum thyroid disease The thyroid lies immediately under the skin it is easily reached by inspection and palpation.
Slide 8 - Inspection Tip the patients head back a bit Use tangential lighting from the tip of the patients chin Ask for swallowing Observe the thyroid cartilage, cricoid cartilage and the thyroid gland raising with swallowing
Slide 9 - Physical Examination Do not press to much the thyroid You can loose the sensitivity of your fingers Try to not strangle your patient Oil on canvas. 1967 Tomie Othake, Brazilian Painter
Slide 10 - Classical Clinical Examination The following information could be obtained volume consistency mobility of the thyroid gland surface temperature fremit sensibility
Slide 11 - Palpation Palpate the thyroid gland from behind Localize anatomic boundaries Thyroid isthmus is often palpable Thyroid lobes are barely or not palpable The concistense is rubbery, similar to that of sternomastoid muscle
Slide 12 - ANATOMIC BONDARIES OF THYROID Cricoid cartilage Supraesternal notch Carotid arteries Four anatomic points must be identified before palpation of thyroid gland is performed
Slide 13 - ANATOMIC RELATIONSHIPS OF THE THYROID
Slide 14 - ANATOMIC RELATIONSHIPS OF THE THYROID
Slide 15 - Classical Goiter Classification Ia -thyroid not visible, lateral lobes smaller than the distal phalanx of the thumb Ib - thyroid visible with neck in extended position II - thyroid visible with the neck in normal position III - thyroid visible at distance
Slide 16 - Simplified Goiter Classification Degree 0 No goiter Degree 1 Goiter palpable but not visible Degree 2 Goiter palpable and visible
Slide 17 - Clinical examination of the thyroid Does clinical examination gives an accurate estimation of the thyroid gland ?
Slide 18 - Accuracy of clinical examination on diagnosis of goiter in children Skvor J, showed a discrepancy between palpation and ultrsonogrphy among 88 individual of 13 years old Palpation overestimated in 24 occasions underestimated in 7 occasions Ultrasonography was suggested as an essential method for the evaluation of the thyroid in children
Slide 19 - Ultrasonography of thyroid intra and inter observer variation Two experts examined 152 thyroid lobes measuring solid nodules and they agreed in 45 % Inter observer variation - kappa = 0,55 e 0,6 (2) Two experts and two young physicians examined twice 53 adults and they agreed in 30% of the the cases Intra observer variation kappa= -0,04 and 0,54 Inter observer variation kappa= 0,44 e 1,0 (1)
Slide 20 - Relationship to other physical characteristics in children Ueda D, examined 300 healthy children and found a positive correlation among thyroid volume and weight and height. (1). Takalo RM et al, found a positive correlation in young individual of 13 years among thyroid volume measured by ultrasound and the weight and body surface area(2)
Slide 21 - The thyroid volume was found to have a positive correlation with body surface area, age and skinfold but in a multiple regression analysis only body surface area remained associated with thyroid volume. The upper limit (95th percentile) of the ratio of thyroid volume to body surface area (ECOBODY Index) was 6.2 ml/m2. Relationship to other physical characteristics in children
Slide 22 - Accuracy of clinical examination in the diagnosis of goiter Considering this index as the criterion standard, the estimated performance of clinical examination for the detection of goiter in the 1094 schoolchildren was: sensitivity of 41%, specificity of 91%, positive predictive value of 27% negative predictive value of 95%.
Slide 23 - Delange et al, studied 7599 European schoolchildren recommended that thyroid volume measured by ultrasound should be considered dependent of age, sex and body surface area in non iodine deficient areas in that continent Accuracy of clinical examination in the diagnosis of goiter
Slide 24 - Thyroid volume in children according to the age
Slide 25 - Which characteristics should the thyroid be related In areas with malnutrition, such as Bangladesh, the BSA reference should be preferred to the reference based on age. Results from the US children indicated that a thyroid volume reference based on weight alone would perform as well as the one based on BSA. European schoolchildren had larger thyroids than US children, perhaps due to a residual effect of iodine deficiency in the recent past in some areas in Europe.
Slide 26 - Thyroid volume relationship to other characteristics in adults Riehl J et al, found, among adults in a deficient iodine intake area, that the thyroid volume was dependent of the age. Individuals with less than 21 years 13,3ml Individuals with more than 70 years 29,9 ml
Slide 27 - Accuracy of clinical examination in the diagnosis of goiter in adults A good correlation was found between clinical examination and ultrasonography (r2=0,872) in large goiters (35,9+-24ml) .
Slide 28 - What a hard thyroid means? If painful - Subacute thyroiditis If not painful- Hashimoto’s thyroidites, cancer or Riedel’s thyroidites (rare) Thyroid gland is considered to be hard if it had a consistency similar to the thyroid cartilage.
Slide 29 - What a painful thyroid means? Subacute thyroiditis Hemorrhage into a nodule Cancer (rare)
Slide 30 - Summary Clinical examination is not accurate in the diagnosis of small goiters The thyroid volume is related to age and body surface area in in children The upper limit of normal range for children suggested is 6,2ml/m2
Slide 31 - In the diagnosis of goiter in areas of mild to severe iodine deficiency where the thyroid glands are bigger In the identification of normal thyroid due to its good predictive negative value Usefulness of clinical examination of the thyroid
Slide 32 - Useful Links American Thyroid Association http://www.thyroid.org/ Endocrine Society http://www.endo-society.org Asia and Oceania Thyroid Association http://www-dnm.kuhp.kyoto-u.ac.jp/AOTA/1cir-e.html European Thyroid Association http://www.uwcm.ac.uk/uwcm/md/ETA.html Latin American Thyroid Society http://www.lats.org
 

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