Monday, June 20, 2005
my life right now
Thursday, June 16, 2005
Sensitivity, Specificity, Positive Predictive Value, Negative Predictive Value
Go across for the PPV and NPV formulas; go down for the sensitivity and specificity formulas.
| Actual | |||
| + | - | ||
| + | TP | FP | PPV |
| - | FN | TN | NPV |
| Sens | Spec |
Tuesday, June 14, 2005
Silicosis
Even ten to thirty years after exposure, silicosis can be asymptomatic. Patients can present with dyspnea, cough, or sputum production. Chest radiographs show small pulmonary nodules, from 1 mm to 10 mm, in the upper lobes of the lungs. Silicosis' complications include with lung cancer, chronic respiratory failure, and cor pulmonale. Patients should be treated for tuberculosis infections and other lung ailments. Other than for severe cases, prognosis is generally good for silicosis with possible mild respiratory symptoms.(2)
Medical Student Report
(1) Harrison's Online
(2) Hanley Pulmonology
McGraw-Hill's AccessMedicine
Monday, June 13, 2005
BRS Biochemistry
Sunday, June 12, 2005
BRS Behavioral Science
Wednesday, June 08, 2005
Higher Student Loan Interest Rates for 2005
BRS Pharmacology
Saturday, June 04, 2005
Reviewing Qbank
Levinson & Jawetz : Medical Microbiology & Immunology
Tuesday, May 31, 2005
Clinical Microbiology Made Ridiculously Simple
MedicalMnemonics.com | Browse | Browse by Category
Contains contributions from around the world. Also available for download onto a PDA.
Saturday, May 28, 2005
BRS Physiology
BRS Pathology
Tuesday, May 24, 2005
USF USMLE 1
http://www.med.usf.edu/2003/usmlesmack.html
Monday, May 23, 2005
The New York Times > Technology > Circuits > State of the Art: A New Spin on a Palmtop (or Inside It)
Great PDA, have to wait till the problems are worked out before it could be really useful in the field.
http://www.palmone.com/us/products/mobilemanagers/lifedrive/
High Yield Neuroanatomy
BRS Histology
Sunday, May 22, 2005
Gosling - Atlas of Human Anatomy
Saturday, May 21, 2005
Step 1 Released Questions
This is the software link for the 150 questions released by USMLE.org. It can be taken in a test format or untimed. Kaplan provides detailed explanations for this series of questions.
Friday, May 20, 2005
High Yield Anatomy
Wednesday, May 18, 2005
Student Loan Consolidation
Monday, May 09, 2005
Metabolic Bone Diseases
| Condition | Thin Trabeculae | Numerous Osteoclasts | Excessive Osteoid | Fibroblast/ Collagen |
| Osteoporosis | X | |||
| Osteomalacia | X | |||
| Primary Hyperparathyroidism | X | X | ||
| Renal Osteodystrophy | X | X | X |
Sunday, May 08, 2005
Dermatopathology II
| Disease | Pathogenesis | Pathology | Clinical Features/ Treatment |
| Erythema nodosum | trigger: drugs, microorganisms, systemic diseases drugs: sulfonamides | fibrous septa of subcutaneous tissue - neutrophil inflammation, extravasation of erythrocytes | dome-shaped, tender, nodules on extensor surface of legs 3rd decade, 3xF:M |
| Erythema induratum | Mycobacterium tuberculosis | initially lobular panniculitis, vasculitis - ischemic necrosis of fat lobules | chronic, recurrent, subcutaneous plaques or nodules on legs, women T - systemic steroids |
| Scleroderma | pathcy lymphocytic infiltrate, loss of peri-eccrine fat, plugging of sweat glands, obliteration of hair follicles, subcutaneous fat turns into collagen | fibrosis and tightening of skin | |
| Granulomatous dermatitis | localized collection of epitheliod macrophages around insoluble antigen | ||
| Allergic Contact dermatitis | sensitization - haptens: oleoresins, Langerhans Cells - CD4+ T cells | spongiotic dermatitis - edema in epidermis spongiotic vasculitis - vacuoles filled with lymphocytes and macrophages | immune rxn to poison ivy, poison oak, poison sumac |
Source: Rubin's Pathology 4th Edition
Dermatopathology I
| Disease | Pathogenesis | Pathology | Clinical Features/ Treatment |
| Pemphigus Vulgaris | antibodies to keratinocytes, autoimmune IgG to desmoglein 3 | seperation of stratum spinosum and outer epidermal layers from basal layer | blistering skin large, scalp, mucous membranes, periumbilical and intertriginous areas |
| Diseases of the Basement Membrane Zone | |||
| Epidermolysis Bullosa | hereditary | splitting of epidermis at or near basement membrane | blisters |
| Epidermolytic EB | disruption of basal keratinocytes | vacuoles filled with abnormal keratin 5 and 14 | blisters from minor trauma - no scarring |
| Junctional EB | AR | lamina lucida blister | blisters |
| Dermolytic EB | defect in anchoring fibrils, defective collagen type VII | roof - normal epidermis, lamina lucida, lamina densa | atrophic scarring |
| Bullous Pemphigoid | complement fixing IgG antibodies to BPAG1 and BPAG2 | subepidermal blisters roof - intact epidermis base - lamina densa cytology - numerous eosinophils, arranged along BMZ seperation at lamina lucida | large, tense blisters T - corticosteroids |
Source: Rubin's Pathology 4th Edition
Saturday, May 07, 2005
Psoriasis
| Disease | Psoriasis |
| Pathogenesis | Genetic factors - HLA-B13,HLA-B17, HLA-Bw57, HLA-Cw6 increased Environmental factors - physical injury, infection, drugs Abnormal cellular proliferation of keratinocytes microcirculatory changes - "bridged" fenestrations, neutrophils at tipsof dermal papillae, dec cAMP Immunologic factors - T cell infiltration |
| Pathology | thickened epidermis -hyperkeratosis + parakeratosis uniformally elongated rete ridges and dermal papillae dilated and tortuous capillaries of papillae epidermal hyperplasia Munro microabscesses - dense collection of neutrophils |
| ClinicalFeatures/Treatment | large, erythematous, scalyplaques dorsal extensor cutaneous surfaces 7% - seronegative arthritis, mild neutrophilic pustules T - coal tar or wood tar, anthralin, corticosteroids, methotrexate,vitamin A, vitamin D |
Ichthyosis
| Disease | Pathogenesis | Pathology | ClinicalFeatures/Treatment |
| Ichthyoses | increasesed cohesiveness,abnormal keratinization, increased basal cell proliferation | abnormally thickened stratumcornerum, hyperkeratosis, thin nucleated epidermis | coarse, fish-like scales |
| Ichthyosis Vulgaris | Autosomal Dominant - reduced or absent keratohyaline granules in epidermis attenuated stratum granulosum - reduced profilaggrin | loose stratum corneum,basket-weave appearance | most common, begins earlychildhood, small white scales on extensor surfaces of extremities andon trunk and face, lifelong disease abnormalities in lipid metabolism from drugs or other diseases |
| X- linked ichthyosis | deficiency of sterioid sulfatase steroid sulfatase degrades cholesterol sulfate | persistent cohesion of stratumcorneum | |
| Lamellar ichthyosis | autosomal recessive - disorderof cornification, defect in lamellar body secretion | increased cohesivenss of stratumcorneum, numerous keratinosomes, abnormally large amount ofintercellular substance | severe and generalized ichthyosis |
| Epidermolytic hyperkeratosis | autosomal dominant, mutation inkeratin genes in suprabasal epidermis | faulty assembly of keratintonofilaments, impaired insertion into desmosomes, prevents normaldevelopment of cytoskeleton -> epidermal lysis and vesicles | generalized erythroderma,blistering, ichthyosiform skin |
Skin Layers and Diseases
| Layer of Skin | Associated Disease |
| Basement Membrane | Bullous pemphigoid - antibodies to BPAG1 and BPAG2 - Type XVII colagen |
| Papillary dermis | psoriasis, lichen planus |
| Recticular dermis | scleroderma, erythema nodosum |
Source: Rubin's Pathology 4th Edition
Skin Cell Types
| Cell Type | Function | Structures |
| Melanocytes | color of the skin | melanosome - melaninsynthesis |
| Langerhan cells | antigen presenting cells | Birbeck granules, MHC I, MHC II,receptors for Fc IgG and Fc IgE |
| Merkel Cell | neurosecretory, tactilemechanoreceptor | form desmosomes with keratinocytes, basal aspect apposed to a small nerve plate |
| Keratinocytes | produce keratin filaments | Keratohyaline granules, Odlandbodies - keratinosomes |
Source: Rubin's Pathology 4th Edition
Gynecological Pathology Endometrium
Condition | Cause | Pathology/Histology | Clinical Features | Other Features |
Proliferative Enodmetrium | · Straight glands · Narrow lumens · Pallisading nuclei · Ovoid nuclei · Mitoses | |||
Early Secretory Endometrium | First manifestation of effect of ovulation on endometrium | · Glands remain straight · Lumens remain narrow · Subnuclear vacuoles appear | 24-36 hours after ovulation | |
Mid Secretory Endometrium | · Glands become coiled · Vacuoles no longer present in glands · Secretory product appears in lumen | Postovulatory days 5-9 | ||
Late Secretory Endometrium | · Intralumenal secretions are spent · Stromal predecidua appears · First predecidua around spiral arteries · Later predecidua beneath surface | Postovulatory days 10-14 | ||
Menstrual Endometrium | · Stromal collapse · Fribrin thrombi and blood · Glands are broken apart · Glands have no secretions | |||
Hyper-secretory Endometrium of Pregnancy | · Arias-Stella reaction · large, hyperchromatic nuclei · prominent cytoplasmic vacuolization | |||
Atrophic endometrium | · short glands · glandular cells – flat, without significant mitotic activity | |||
Dysfunctional Uterine Bleeding | · anovulatory bleeding · luteal phase defect | |||
Unopposed Estrogen | · proliferative glands · stromal breakdown · fibrin thrombi · wreathing of stroma by glandular cells | |||
Contraceptives | Combined oral agents | · mix of proliferative and secretory changes · long use · atrophic glands · stromal predecidual pattern dominates | ||
Depoprovera | · unopposed progesterone | |||
Tamoxifen | · inc risk of carcinoma · inc incidence of polyps · large, mucinous metaplasia, fibrotic | |||
Endometrial Hyperplasia | · unopposed estrogen stimulation – exogenous, endogenous · no progestational stimulation | · simple or complex architecture · typical or atypical nuclei | Vaginal bleeding, 60s Risk factors – obesity, diabetes, nulliparity, early menarche, late menopause | Complex atypical hyperplasia progresses to carcinoma – 1/3 T – hysterectomy, hormonal manipulation |
Endometrial Carcinoma Type 1 Endometrioid | · PTEN gene mutation à cell growth and apoptosis | · squamous or mucinous | Grade determines prognosis T – hysterectomy, good survival Low grade – hormonal | |
Endometrial Carcinoma Type 2 Unfavorable Histology | · serous-p53 mutations | · clear cell | Early spread outside uterus long term survival uncertain |
Gynecological Pathology I
| Condition | Cause | Pathology/Histology | Surface Features | Other Features |
| Vulvar Malgnancies | ||||
| Vulvar Intraepithelial Neoplasia | HPV | Varying degrees of loss of maturation of squamous cells | Single or multiple plaques or papules | Co-exists with cervical dysplasia |
| Invasive squamous cell carcinoma | Keratinizing squamous cell histology | Ulcerated exophytic lesions | Most common vulvar malignancy | |
| Verrucous carcinoma | Well differentiated, locally invasive | Giant condyloma | Unlikely to metastasize, subset of invasive squamous cell carcinoma | |
| Extramammary Paget’s Disease | Intraepithelial adenocarcinoma in the vulva | Red, moist plaque | ||
| Malignant Melanoma | Same as skin melanoma | Second most common malignant tumor in vulva | ||
| Benign Disorders of Vulva | ||||
| Lichen Sclerosis | Atrophic epidermis, hyalinized epidermis | White plaques | ||
| Squamous hyperplasia | Thickened epidermis | White plaques | ||
| Hidradenoma | Benign tumor | Sweat gland origin – apocrine | ||
| Syringoma | Benign tumor | Sweat gland origin – eccrine | ||
| Hemangioma | Benign tumor | Mesenchymal | ||
| Vagina | ||||
| Failure of squamous cell maturation | Absence of estrogen | |||
| Adenosis | DES exposure, sporadic | Abnormal retention of embryologic glandular epithelium | ||
| Benign disorder | ||||
| Squamous cell carcinoma | Vaginala intraepithelial neoplasia | Most common vaginal neoplasm, assoc w cervical and vulvar SSC, 80% spread from cervix | ||
| Clear Cell Adenocarcinoma | Prior DES exposure | Peak age 17-22, very uncommon | ||
| Embryonal Rhabdomyosarcoma | Sarcoma of primitive skeletal muscle | Sarcoma botryoides – grape like | Seen in young children | |
| Cervix | ||||
| Cervical Intraepithelial Neoplasia | HPV esp types 16,18, 31, 33, 35 Ã Inactivation of suppressor gene products p53 and Rb | Occurs in transition zone Degree of loss of maturation in squamous cells | ||
| Invasive Carcinoma of Cervix | Microinvasion, non-keratinizing squamous cel,l Advancing disease can obstruct ureters, invade locally | Adenocarcinoma – less common, more aggressive 2nd most common cause of death WW |
Gynecological Pathology
Condition | Cause | Pathology/Histology | Clinical Features | Other Features |
Proliferative Enodmetrium | · · · · · | |||
Early Secretory Endometrium | First manifestation of effect | · · · | 24-36 hours after ovulation | |
Mid Secretory Endometrium | · · · | Postovulatory days 5-9 | ||
Late Secretory Endometrium | · · · · | Postovulatory days 10-14 | ||
Menstrual Endometrium | · · · · | |||
Hyper-secretory Endometrium | · · | |||
Atrophic endometrium | · · | |||
Dysfunctional Uterine Bleeding | · · | |||
Unopposed Estrogen | · · · · | |||
Contraceptives | Combined oral agents | · · · · | ||
Depoprovera | · | |||
Tamoxifen | · · · | |||
Endometrial Hyperplasia | · · | · · | Vaginal bleeding, 60s Risk factors – obesity, diabetes, nulliparity, early menarche, late | Complex atypical hyperplasia T – hysterectomy, hormonal manipulation |
Endometrial Carcinoma Type 1 | · | · | Grade determines prognosis T – hysterectomy, good survival Low grade – hormonal | |
Endometrial Carcinoma Type 2 | · | · | Early spread outside uterus | |
Uterine Mesenchymal Tumors | ||||
Leiomyoma | · | · · · · | Extremely uncommon | |
Leiomyosarcoma | · | · · · | ||
Stromal Sarcoma | · | · · | Appearance of endometrial stroma | T- hormonal therapy |
Uterine Mixed Tumors | ||||
Adenomyoma | · | · | ||
Adenosarcoma | · | · | ||
Carcinosarcoma | · | · | ||
Fallopian Tube | ||||
Infection | · · | Important cause of infertility | ||
Ecotpic Pregnancy | · | Ruptured fallopian tube is life | Most common site of ectopic | |
Ovary and Placenta | ||||
Polycystic Ovary Syndrome (Stein-Levanthal) | - - | - - | ||
Endometriosis | - - - - | - | - - | |
Ovarian Tumors | - | - | - | |
Ovarian Epithelial Carcinomas | - - - - - | - | - | Highest mortality rate of female Difficult to detect early, spread beyond ovaries Adults, first-degree relatives, industrialized Inc with age, dec with parity and oral contraceptive |
Benign Ovarian Germ Cell Tumors | - | - - - - | - | Wide age range |
Malignant Ovarian Germ Cell | - | - - - - | - | Highly malignant course but Exclusively children, young adults |
Sex Cord Stromal Tumors | - | - | - | - - |
fibroma | - | - | - | - |
Thecoma | - | - | - | - |
Granulosa cell tumor | - | - | - | - |
Sertoli-Leydig cell tumor | - | - | - | - |
Metastatic Tumors to the Ovary | - | - | - | - - |
Placenta | - | - | - | - |
Chorioamnionitis | - - | - | - | - - |
Villitis | - - | - | - | - |
Sponataneous Abortion | - - - - - | - | - | - - |
Septic Abortion | - | - | - | - |
Toxemia of Pregnancy | - - - | - | - - - - | - |
Placental Abnormalities | - | - | - | - |
Retroplacental Hematoma/ Abruption | - - | - | - | - |
Placenta Accreta | - | - - | - | - |
Gestational Trophoblastic | - | - | - | - |
Complete Hydatidiform Mole | - - - | - | - | - |
Partial Hydatidiform Mole | - - | - | - | - |
Choriocarcinoma | - | - | - - | - |
Pregnancy and Preeclampsia
|
| Normal Pregnancy | Preeclampsia |
| Blood Pressure | Fall in first 24 weeks, rises to baseline by term | 140/90 after 20 weeks gestation severe - >160/100 |
| Kidneys | GFR increases 50%, renal plasma flow increases serum urea and creatinine decrease; enhanced waste metabolite removal; glycosuria | Vasospasm and capillary endothelial swelling -> reduction in GFR Serum uric acid and creatinine increased Proteinuria > 300 mg in a 24 hour collection Severe – proteinuria > 5 g/24h, oliguria (<500cc/24h) |
| Edema | Normal | Presenting sign but 1/3 don’t have it |
| Hemostatic | Venous stasis from hypercoagulable state | Systemic vasospasm, coagulation system activation, abnormal hemostasis Cycle – endothelial injury, platelet activation, platelet consumption |
| Prostanoid Changes | Both prostacyclin (PGI) and Thromboxane A2 (TXA) elevated, PGI > TXA | TXA > PGI PGI – vasodilator and inhibitor of platelet aggregation TXA – vasoconstriction and platelet aggregation |
| Autonomic |
| Increased sympathetic state – vasoconstriction |
| Nitric Oxide |
| Reduced |
| Free radical oxidation products |
| Increased |
| Hematologic | Plasma vol inc, RBC mass inc à “physiologic anemia” of pregnancy Hgb 11.5 mg/dl WBC count increases Hypercoagulable state – inc fibrinogen, factor VII to X increase – venous stasis | - Thrombocytopenia - Severe - <100,000 - fibrinogen decreased - coagulation time increased (PT, PTT) |
| Hepatic | Signs of liver disease Spider angiomata and palmar erythema – elev estrogen Serum – dec albumin, elev alk phos, elev cholesterol Estrogen increased proteins – fibrinogen, thyroid hormone binding globulin, ceruloplasmin Hepatic enzymes – AST/ALT, PTT unchanged | 10% - transaminase elevation severe – impaired liver function (AST/ALT >70) |
| Pulmonary |
| Severe – pulmonary edema |
| Cerebral or visual disturbances |
| Severe cases |
| Epigastric pain |
| Severe cases |
| Seizures |
| Severe cases -> Eclampsia |
Sunday, May 01, 2005
Wednesday, April 20, 2005
Free iPod
Check out this great site that is giving away totally FREE iPods!
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It's a completely legitimate offer, and this company has already given away $4 million in FREE stuff!
All you have to do is join, complete an online offer, and refer friends to do the same. That's it!
Here is my referral link. To help me get my iPod, click this exact link to join, or copy and paste it into a browser:http://www.freeiPods.com/?r=17539794
If you want a new credit card, sign up for this, and you might get a free iPod also. Current credit cards available are Bank of America Power Rewards Platinum, Citi Platinum Select, Citi Platinum Select for Students, and GM Card.
Sign up for Napster's 14 day free trial>wait one-three days for confirmation on freeipods.com>cancel Napster>get five more people to do the same
Here's the basics: sign up for free, sign up for a trial of a service, and refer five other people to do the same.
Tuesday, April 19, 2005
Deciding on going to Medical School
Monday, April 18, 2005
Mesothelioma
8% of people exposed to asbestos develop mesothelioma, and 60-80% of people with malignant mesothelioma have had previous asbestos exposure. Physical signs include dullness to percussion and diminished breath sounds over the growth. Finger clubbing can also be present. These signs can be found in several other malignancies. Accurate diagnosis can be made using radiography, CT scans, and biopsies. Mesothelioma can cause the lining of the lungs to thicken, and it can also cause fluid to accumulate in this lining. It is a malignant tumor that can spread throughout the chest and even into the abdomen. Treatment with radiation, surgery, and chemotherapy is rarely successful. (2)
-Medical Student Report
Sources:
(1)Harrison's Online
(2)Current Medical Diagnosis & Treatment 2005
Tuesday, April 12, 2005
GoArmy.com > Army Health Care > News > News Article
The Army, along with the Navy and Air Force, provides generous scholarships for medical students. They will pay for the entire tuition of your school for one, two, three, or four years. Additionally,you receive a monthly stipend of about $1200 for 10.5 months and get paid a little more as a member of the army for 1.5 months. This is an obligation scholarship. Basically, you will owe the army one year of service as an attending for each year of scholarship or residency training received from the army. At the end of medical school, you will either select match into the army residency program or the civilian residency program. If you decided on the army residency program, you will owe an obligation of the number of years of residency or the number of years of scholarship received, whichever is larger. As an army resident, your pay is usually significantly higher than civilian residents, sometimes more than $60,000. Currently, with some medical schools having a tuition of upward of $36,000, this scholarship can be worth up to $48,000 per year. One caveat is that army attending pay is lower than civilian pay in some specialties, and this would defray the savings from the scholarship. This scholarship is a great idea for people interested in primary care, pediatrics, and general practice if you're going to a private college. For more information, please contact an Army recruiter.
Wednesday, April 06, 2005
Friday, March 18, 2005
Kaplan Online Web Prep adn Q-Bank
Online Web Prep provides a few hundred lectures based on subjects. A 9 month subscription is available from Kaplan for a reduced price at medical schools. Its a good way to learn during the actual class itself, and review related materials. The Web Prep comes along with Kaplan's lecture notes books.
Saturday, March 12, 2005
Web WordNet 2.0
Provides definitions. It's good for medical terminology including pathology terms and medicine names.
USMLE - United States Medical Licensing Examination Step 1 Outline
The official USMLE site shows an outline of what will be covered on the Step 1 examination.