final Flashcards
plasma
all parts of blood
serum
fluid remaining if blood is allowed to clot
CBC
complete blood count (total cells)
differential=shows different types of white blood cells
when is blood smear done?
when CBC and diff is abnormal
-pathologist examines blood smear
myeloid progenitors
lymphoid progenitors
give rise to erythrocytes, platelets, granulocytes, and monocytes
give rise to lymphocytes
4 myeloid cell lines
erythroid/megakaryocytic
macrophage/granulocytic
eosinophilic
mast cell/basophilic
how much blood is in the body?
5L (blood and plasma)
hematocrit
ratio of cells to total blood volume
abnormal blood cells
normal=biconcave disk
abnormal=smaller microcyte, target cell, macrocyte, sickle cell, fragments
-useful in diagnosing various disorders
hemoglobin
carries oxygen
- 4 chains, each with heme molecule (which contains iron)
- Fe, B12, B6, and folate needed to make Hb
how long do RBCs live?
120 days
-spleen removes old ones and recycles Hb
bilirubin
breakdown product of heme-goes to liver, then SI in bile, and the reabsorbed
why do bruises change color?
as heme is converted to bilirubin by macrophages, they change to yellow
types of anemias
iron deficient aplastic-no RBCs megaloblastic sickle cell hemolytic
leukopenia
decrease in WBCs
anemia definition
decrease in RBC (and therefore Hb) mass
- in females, Hb less than 115
- in males, less than 130
hemolysis
destruction of RBCs
- inherited
- or acquired-from immune, mechanical, or infections or chemicals
first sign of bone marrow failure
anemia
decreased RBC production mechanisms
- bone marrow failure (aplastic anemia)
- defective DNA synthesis (megaloblastic anemia)
- defective Hb synthesis (iron deficiency anemia)
Sxs of anemia
- pale skin and mucosa
- fatigue, dyspnea on exertion
- brittle nails
- koilonychia (spoon shaped nails)
- headache, decreased vision, drowsiness
- white creases in hands (vs. red normally)
- pale conjuctiva
iron deficiency anemia
- causes of iron deficiency are decreased intake, absorption, loss (eg chronic blood loss), or requirements (eg pregnancy)
- transported bound to transferrin and stored as ferritin
what type of anemia results from iron deficiency?
hypochromic microcytic anemia
low hematocrit and Hb
serum iron and ferritin low
aplastic anemia
loss of myeloid progenitor cells in bone marrow–>pancytopenia
- decreased WBCs in infections
- decreased platelets–>causes bleeding
- decreased hemoglobin causes anemia
causes of aplastic anemia
idiopathic-primary
- may be some autoimmune cause
- secondary-cytotoxic drugs, radiation, viral infection
- radiation and chemo attack dividing cells and there are lots in the bone marrow
pancytopenia
decrease in all myeloid lineages
megaloblastic anemia
characteriized by megaloblasts in bone marrow and their descendants in blood
- 2nd most common cause of anemia
- two major causes are B12 and folate deficiency
B12 deficiency
due to impaired absorption, decreased intake, or increased requirement or lack of intrinsic factor (carrier molecule) as in pernicious anemia
what is the cause of pernicious anemia?
autoimmune destruction of parietal cells in stomach
-see Abs to intrinsic factor
folate and B12
folate reserves are small (months) compared to B12
spinal chord lesion may result if prolonged low B12 (alcoholics, pregnancy)
causes of hemolysis
intracorpuscular defect (problem with RBC) -Hb defect, enzyme defect, or membrane defect extracorpuscular defect-problem with body -autoimmune destruction, infection, mechanical destruction
sickle cell anemia
inherited disorder
- due to defect in beta globin gene
- low oxygen causes RBCs to sickle and small vessel occlusion can happen
sickle disease
homozygotes
sickle cells in blood and sickling crisis
-depend on exchange transfusions
-can be less severe if fetal Hb sticks around
-spleen is affected and dysfunctional b/c of backup by teens
sickle trait
heterozygotes
asymptomatic except in extreme cases (like airplanes w/pressurized cabins)
Sxs of sickle disease
- ulcers
- abnormal bone growth
thalassemias
group of disorders caused by gene defects in Hb gene chains (alpha thalassemia-defective alpha or beta)
what type of anemia do thalassemias cause?
- hypochromic microcytic anemia
- target cells in smear
hereditary spherocytosis
- group of disorders of inherited defect in strutural proteins in red cells
- defective cells unable to maintain shape and are removed by spleen
- variable severities
autoimmune hemolytic anemia
Abs against own RBCs
- ideopathic
- secondary to lymphoproliferative disease or drugs
- challenging b/c lots of transfusions–>Abs to smaller parts of RBCs
shistocytes
RBC fragments
-seen in hemolytic anemia
polycythemia
increase in RBCs
causes of polycythemia
- primary: genetically inclined to make EPO
- secondary: high altitude living, chronic long disease
polycythemia rubra vera
- neoplastic disease of RBC precursors
- increased viscosity of blood
- insensitive to EPO and requires blood removal
leukopenia
decreased WBCs
leukocytosis
- increase in WBCs
- neutrophilic=increase neutrophils
- eosinophilia=increased eosinophils
leukemias
malignant blood cell precursor proliferation in bone marrow
lymphomas
malignant proliferation of cells in lymphoid tissue
acute lymphoid leukemia
most common type in children
-chemo, pretty treatable, 50% cured
most common cause of cancer in kids under 5
leukemia
acute myeloid leukemia
most common form in adults
-treat with bone marrow transplant
chronic myeloid leukemia
- chronic and accelerated phase, then blast crisis
- Philadelphia chromosome
chronic lymphoid leukemia
more common in elderly
low grade and slow progression and therefore not susceptible to treatment as much
Hodgkin’s disease
- characterized by reed steinberg cell
- common in 2 age groups: 25 and 55
- staging is important and chemo is effective
non hodgkin’s lymphoma
- diverse group of diseases
- graded low, medium, or high
follicular lymphoma
most common form
low grade
affects the elderly
diffuse large cell lymphomas
- intermediate or high grade
- poor prognosis
burkitt’s lymphoma
- EBV infection
- highly malignant
- affects children from northern Africa
- lymph nodes less defined
multiple myeloma
malignant disease of plasma cells
- middle aged
- boney lesions, kidney damage
hematostasis
=stopping of bleeding
by interaction of vessels, platelets, and coagulation factors
what makes people more susceptible to clots?
lack of natural anticoagulants
hemophilia A
congenital
factor VIII
hemophilia B
congenital
factor IX
DIC
disseminated intravascular coagulation
-clots form all over and factors are consumed, leading to spontaneous bleeding
4 layers of the GI tract
inner mucosa: epithelium, lamina propria, and muscularis mucosae
submucosa-contains vessels
muscularis propria-responsible for peristalsis
serosa/adventitia/peritonium
what is a concern with cleft lip and palate?
sucking is affected and this is how babies get food
dental caries
cavities
-disease of tooth due to bacterial erosion of structure
streptococcus mutans like sugar in saliva
plaque promotes attachment of bacteria, which secrete degrading enzymes
complications of cavities
pulpitis
atypical abscess
periatipical granuloma
radicular cyst-
which may result in destruction of tooth
periodontitis
inflammation of periodontal recesses-gingiva, periodontal membrane, alveolar bone
what is the most common cause of tooth loss?
periodontitis
-inflammatory cells release enzymes that loosen tooth
stromatitis
inflammation of the mouth
- infectious causes, eg herpes, bacteria, fungi
- or non infectious causes, eg aphthous ulcers (canker sores) or ideopathic causes
leukoplakia
persistant white lesion in the mouth
erythroplakia
persistant red lesion
risk factors for malignant oral neoplasms
tobacco use, alcohol, HPV
other contributing factors: sun exposure (lips)
common locations of oral neoplasms
anterior 2/3 of tongue, lower lip
-possibly metastasize to LN
sialadenitis
inflammation of a salivary gland, usually parotid
- ie both sides of face, each gland is paired
- infectious causes: viral (mumps), bacterial (staph. aureus
- autoimmune causes: lupis, Sjogren syndrome
major salivary glands
parotid, submandibular, sublingual
pleomorphic adenoma
benign salivary neoplasm of epithelial and stromal elements
- needs proper excision, may recur locally
- infectious causes: herpes, fungal (uncommon w/out immune compromise)
- chemical causes: GERD
GERD
reflux of gastric contents to lower esophagus–>inflammation
-due to relaxed sphicnter
barretts esophagus
presence of metaplastic intestinal type epithelium in esophagus-change from squamous to columnar
-means increased risk of developing adenocarcinoma
hiatus hernia
displacement of portion of stomach above diaphragm
- sliding hernia=stomach slides upward (90%)
- paraesophageal hernia=stomach protruding upward beside esophagus (10%)
achalasia
disorder of esophagus resulting in increased resting tone of LES
- food is unable to ent er stomach
- can cause aspiration of food, nutrition problems
esophageal varices
dilation of submucosal veins of distal esophagus
-often due to portal hypertension secondary to hepatic cirrhosis
significant morbidity and mortality when ruptures
acute gastritis causes
stress, drugs (asprin), alcohol
chronic gastritis
- with acute inflammatory flares
- one type: heliobactor pylori infection: survives in acidic environment
- autoimmune: destruction of parietal cells in stomach
what is h pylori infection associated with?
increased risk of gastric adenocarcinoma and lymphoma
what does autoimmune gastritis cause?
- increased adenocarcinoma risk
- megaloblastic anemia due to inability to absorb B12
peptic ulcer disease
-localized chronic ulceration of gastric or duodenal mucosa
risk factors for peptic ulcer disease
H pylori (80%), stress, hormones
complications of peptic ulcer disease
hemorrhage
perforation and peritonitis
scarring (stenosis, obstruction) below submucosa is affected
gastric carcinoma
- adenocarcinoma
- poor prognosis, 5 yr survival 20%
- spreads to LN (virchow node)
risk factors for gastric carcinoma
nitrosamines, japanes, H pylori
lymphoma of stomach
common sit for extra-nodal lymphoma in MALT
-chronic H Pylori
Meckel’s diverticulum
- developmental disorder of small bowel due to persistence of omphalomesenteric (vitelline) duct
- causes all layers of bowel wall to outpouch
- ->malabsorption, celiac, maldigestion
giardia
parasite (bever reservoir) that infects the small bowel
carcinoids (small bowel)
- low grade malignant neoplasm of neuroendocrine cells
- carcinoid syndrome possible (diarrhea, flushing)
- locally invasive