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Alpha thalassemia intermedia (Hemoglobin H Disease) results from a deletion of three out of four alpha chain loci. Infants born with alpha thalassemia intermedia appear normal at birth but often develop anemia and splenomegaly by the end of their first year. Hepatomegaly is not a common finding and there may be some association with mental retardation. Due to the hemolytic nature of this anemia, there may be an increase in respiratory infections, leg ulcers and gallstones. Skeletal changes are not commonly seen in hemoglobin H disease. Every ethnic group can have occurrences of hemoglobin H disease; but it is most often seen in Southeast Asian, the Middle East and the Mediterranean islands. Development and life expectancy are usually normal, but some affected individuals may require splenectomy and transfusion therapy.

Due to the wide range in urine pH values in healthy individuals, pH results must be evaluated in conjunction with the patient's medical condition. Factors to be considered include: respiratory or metabolic acidosis respiratory or metabolic alkalosis renal function crystal or calculi formation urinary tract status diet

Free radicals are well known to occur in biological systems. A free radical is an atom or small molecule with unpaired electrons. These unpaired electrons make the atom or molecule highly reactive and unstable. Free radicals are produced constantly via metabolic processes. They are also released by immune cells. Immune cells can undergo 'oxidative bursts' (also called respiratory bursts) to help fight pathogens. Oxidative bursts can help degrade pathogens phagocytosed by immune cells and therefore free radicals have an important role in immune system function.However, free radicals also have detrimental effects on surrounding cells. When LDL is co-localized with cells or tissues that are releasing free radicals (such as in an inflamed vessel wall) the free radicals can chemically modify the phospholipids and other components of the lipoprotein. The LDL becomes oxidized and the modification makes the LDL more atherogenic.

Most likely means of dissemination: Aerosol (eating contaminated food)Primary route of entry: Inhalation (oral)General signs and symptoms: Difficulty with speaking, swallowing, or blurred or double vision, drooping eyelids (ptosis), dilated pupils, dry mouth, decreased gag reflex, weakening of the reflexes (hyporeflexia), abnormal sensations such as numbness, prickling, tingling, and arm or leg weakness.Botulism is caused by a neurotoxin and technically could be classified as a chemical WMD. For our discussion it is placed under biological agents because the toxin is derived from a bacterium. Botulism is potentially life-threatening, producing a characteristic clinical picture of muscular paralysis leading to respiratory failure.                Photo courtesy of the CDC archives.    

CDC statistics for the United States in 2001 show that only five other causes led to more deaths than medical errors:Heart disease-700,000Cancer-554,000Stroke-164,000Chronic lower respiratory disease-123,000Accidents-102,000 The IOM report on medical errors concurs and comments that even with conservative estimates, medical errors are the eighth leading cause of death in the United States.

Erythrocytes are produced in the bone marrow and released into the peripheral blood where they may remain for approximately 120 days before senescence.Their main function is the transport of the respiratory gases (oxygen and carbon dioxide) between the lungs and body tissues.Each erythrocyte can be thought of as an "envelope" containing hemoglobin.Each hemoglobin molecule contains iron which has a high affinity for oxygen.As a result, when an erythrocyte passes through one of the capillaries of the lungs, it picks up oxygen.The oxygen is transported through the blood to the tissues where it is released.Carbon dioxide from the tissues then diffuses into the RBC where it undergoes chemical changes.About 70% of the altered carbon dioxide diffuses into the plasma, 25% binds to the hemoglobin molecule, and 5% goes into simple solution within the red cell.In each of these three ways carbon dioxide is transported from the body tissues back to the lungs, where it is released.

Information concerning the eye, skin, and respiratory protection required while using the chemical. Safety goggles are the minimum eye protection and rubber or nitrile gloves must be worn when handling any chemical. Any special ventilation that might be needed.

The degree of electricity-induced injury is dependent on: The amount of electrical energy that is delivered The resistance that is encountered The type of current The current pathway The duration of contact

John Wagner, a phlebotomist at General Hospital, went up to the 7th floor to draw routine blood work on a patient. As he approached the door of the patient’s room he noticed a red stop sign on the door with the words “Respiratory Isolation” written on it.

Phlebotomists work in a variety of settings including: Hospitals Physician Offices Nursing Homes Home Health Care Clinics, and Military facilities. A well trained phlebotomist will therefore have a variety of job opportunities available.Other medical professionals, including nurses, respiratory therapists, and medical assistants may also be trained to collect blood specimens.

Epithelial cells in large numbers within sputum smears means that the specimen is predominantly oral saliva, rather than true sputum from the lung. Epithelial cells in urine smears indicate that the sample has been contaminated by organisms found on the vulva or distal urethra. Bacteria found near or on epithelial cells are usually normal contaminating bacterial flora.White blood cells indicate inflammation and possible infection. The direct smear examination should focus within and around these cells.Red blood cells in a direct smear are not usually significant.Yeast may be present as normal flora in upper respiratory tract or genital tract. They may be significant if they predominate, or if budding yeast forms are seen.Hyphae are more likely to indicate the presence of fungal infection, but this determination requires correlation with clinical findings.Bacteria found in spinal fluid, blood, tissue and specimens from other sterile sites are always significant.Body fluids which are normally sterile must be examined carefully. If only one organism per oil immersion field is identified, then there are about 105 organisms per mL present in the sample! Bacteria observed in specimens from the throat, genital tract and other areas containing normal flora suggest infection only if their composition and type varies significantly from the norm.

An important element of safety is personal protective equipment (PPE). This must be provided to phlebotomists by their facility and may include gloves, lab coats and protective eyewear. An N95 respirator (shown in the lower image) or other respiratory protection may be required to protect the phlebotomist from Mycobacterium tuberculosis or other airborne infectious agents. Phlebotomists and other healthcare workers must be medically cleared and fit-tested to wear N95 respirators. For the phlebotomist, gloves are required during every procedure. The gloves must remain totally intact. The gloves cannot be altered in any way as to expose the hand or fingers to potential bloodborne pathogens. Never remove all or part of the finger tip of the glove while performing venipuncture.

Administrative controls reduce the risk of exposure to persons who might have TB disease.Environmental controls prevent the spread and reduce the concentration of infectious droplet nuclei in ambient air.Respiratory protection controls are for situations that pose a high risk of exposure to further reduce risk of exposure of HCWs to infectious droplet nuclei that have been expelled into the air from a patient with infectious TB disease.

Patients with active TB should be assigned to single-patient rooms in which entry of HCWs and visitors is controlled.All HCWs use a N95 disposable respirator.Visitors may be offered respiratory protection and should be instructed by HCWs on the use of the respirator before entering.The room has requirements for controlled ventilation, negative pressure, and air filtration.Each isolation room should have a private bathroom.

Biosafety level (BSL) 3 practices, safety equipment, and facility design and construction are applicable to microbiology laboratories that work with indigenous or exotic agents with a potential for respiratory transmission, and which may cause serious and potentially lethal infection. If the laboratory is propagating and manipulating cultures for M. tuberculosis, BSL 3 practices, containment equipment, and facilities are required. Nonaerosol-producing manipulations can be performed using BSL 2 practices, containment equipment, and facilities. At biosafety level 3, laboratory manipulations should be performed in a Class l or Class ll biosafety cabinet (BSC) or other physical containment device. Secondary barriers include controlled access to the laboratory and ventilation requirements that minimize the release of infectious aerosols from the laboratory. Secondary barriers should include self-closing double-door access and negative airflow into the laboratory. Exhausted air must not be recirculated.