Dermatology Made Simple : Classification of Urticaria:

 Classification of Urticaria:

Classification on basis of duration of symptoms:

Acute Urticaria:

Symptoms last for less than 6 weeks.

Chronic Urticaria:

Symptoms last for more than 6 weeks.

Classification based on underlying cause:

Idiopathic:

In 50 % of cases,urticarial is idiopathic or has no underlying cause.

This is most common form of urticarial.

Intermittent fleeting wheels occur at any skin site with or without angioedema.

Lesions maybe annular,popular or even serpiginous.

The lesions may last from minutes to hours and may recur over less than 6 weeks.

Trigger factors for urticarial include:

Infections

Food

Medications

Contact allergic

Cholinergic Urticaria:

This occurs after a warm shoer/bath or after exercise.

Patients are usually 10 – 30 years old.

Lesions consist of pinhead sized wheals with a red flare around them

Solar Urticaria:

This occurs rarely in clinical practice.

In this condition,sunlight causes  an acute urticarial eruption.

Symptoms occur within 30 minutes of sunlight exposure.

Lesions resolve quickly on cessation of sunlight exposure.

Differential Diagnosis of Solar urticaria are:

Porphyria : Lesions resolve with scarring

Polymorphic light eruption: Lesions take days to weeks to resolve.

Pressure Urticaria:

These lesions occur at site of pressure on the skin.

It usually presents in pressure areas.

The rash appears after 6 hours of contact.

Symptoms are usually recurrent.

It usually responds to Dapsone or Montelukast.

Urticarial Rash



Urticarial Hives

Computer Studies Made Simple : Plotters

Plotters

A plotter is an output device that produces high quality image graphics using different colors.

Applications

Plotters are used for:

Charts

Graphs

Maps

Architectural designs.

It has got markers in a  mechanical arm and draws lines on paper.

Types of plotters:

1.Flat bed plotter:

This is used to plot or draw images.

It contains pens for drawing images.

The paper is placed on table like surface.

Software gives instructions to the pen to move down on the paper and pen moves in a way to create the 

required images.

They usually contain one or more pens of different colors and widths.

2.Drum plotter:

This works by using a rotating cylinder.

The drawing pens are attached to the cylinder.

The pens move from one side to another and create the required images.

Dermatology Made Simple : Management Of Urticaria:

Management Of Urticaria

1.Avoidance of allergens/trigger factors.

2.Treatment of Underlying  Medical condition.

3.Pharmacological Treatment:

Antihistamine:

H1 receptor blockers : Cetrizine,loratidine and chlorpheniramine

Combination of H1 receptor blockers and H2 receptor blockers in severe cases.

Leukotriene receptor antagonists:

Montelukast and Zafirlukast

Oral Corticosteroids maybe used in very severe eruptions.

Intramuscular adrenaline in life threatening scenarios and anaphylactic shock.

Clinical History in Urticaria:

This is of primary significance.

It is important to ask about onset,duration and course of lesions and associated rash and swelling.

Urticaria is very itchy and  angioedema is painful.

Patients with urticarial complain of itcy spots and rashes lasting minutes or hours. Usually less than 24 hours 

and that resolve leaving no scars or marks.

In angio-edema,there may be swelling of face and lips and tongue that may last for hours and days.

Incase the lesions last for more than 24 hours and is painful and resolves with bruising,urticarial vasculitis is more likely than ordinary urticaria.

Pateints may occasionally feel unwell before the onset of rash or swelling and in severe reactions,anaphylaxis may result.

It is important to find out about any possible trigger before onset of rash,eg any food eaten,medications taken,insect stings,infections etc.

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Computer Studies Made Simple : Non-impact printers

Non-impact printers

A non-impact printer prints characters and graphics on a piece of paper without striking the paper.

Some of these papers use spray ink while others use heat and pressure to create images.

These printers are faster than impact printer.

Types of non-impact printers:

A.Laser printer

B.Inkjet Printer

C.Thermal printer

A.Laser printer:

These are non-impact printers.

They work in a way similar to photocopying machine.

The laser creates images on a paper by laser beam.

LASER means Light amplification by stimulated emission of Radiation.

Laser throws magnetic material powder on paper in the form of microscopic dots.

The density of these dots ranges from 300 to 2000 dots per inch.

The printing speed of laser printers is from 5 to 300 pages per minute.

Laser printers are also called as page printers.

They print one page at a time.

They are faster than inkjet and dot matrix printers.

Color printing with laser pinters is very costly.

B.Inkjet Printer:

An ink jet printer is a type of non-impact printer.

It prints characters and graphics by spraying tiny drops of liquid ink on paper.

These printers can produce quality text and graphics in both black and white color.

Inkjet printers are slower than laser printers.

They print 1 – 6 pages / minute.

Its print quality is higher than dot matrix printer.

They are also relatively inexpensive.

Most inkjet printers usually have two print cartridges : one containing black and other containing color.

Another type of inkjet printer is called bubble jet printer.

Thermal printer:

This uses color waxes and heat to produce images by burning dots on special paper.

The color wax sheets arenot required for black  and white output.

Thermal printers are expensive and require costly paper.

These printers are used to create the highest quality color printing. 

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Dermatology Made Simple : Urticaria

Urticaria

Urticaria is defined as transient pruritic swellings on the skin.

It is also termed as wheals or hives.

Pathophysiology:

It occurs due to oedema in the superficial layers of the skin.

Causes:

It can occur in association with:

Allergic reactions

Infection or

Physical stimuli

In association with vasculitis,pemphigoid or dermatitis herpetiformis.

Angio-oedema is painful rather than itchy.

It appears as diffuse swelling that affects the deeper layers of the skin.

It can occur rapidly and may involve the mucous membranes.

Urticaria is a fairly common skin disorder that may occur as a single episode or recurrent.

The prognosis is varied and depends upon the underlying cause.

Pathophysiology:

Urticaria results from release of histamine,bradykinin and pro-inflammatory mediators being released from 

basophils and mast cells in response to various trigger factors.

These chemicals released by degranulation cause capillaries and venules to leak causing tissue oedema.

Urticaria maybe IgE mediated with cross linking of two adjacent IgE receptors or complement mediated causing direct degranulation of mast cells or mast cells may directly be stimulated by an exogenous or 

unknown substance.

In patient with chronic urticarial, histamine canbe released spontaneously or in response to non-specific 

stimuli and their vasculature is more sensitive to histamines.

.

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Computer Studies Made Simple : Printers

Printers

A printer is an output device that prints characters,symbols and graphics on paper.

The printed output is called Hard Copy.

Print resolution is usually measured in Dots per inch DPI.

Types of Printers:

1.Impact Printers:

This works like a type writer.

It prints characters or images by striking print hammer or wheel against an inked ribbon.

Dot matrix and line printers are examples of impact printers.

2.Non-impact Printers:

These print character and graphics on a piece of paper without striking the paper.

Some of these printers use spray ink while others use heat and pressure to create images.

These printers are faster than impact printer.

Inkjet and laser printers are examples of non-impact printers

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Dermatology Made Simple : Pruritis

Dermatology Made Simple : Pruritis

Pruritis:

Pruritis is defined as itching of the skin

Pruritis maybe generalized or localized and maybe associated with normal skin or skin changes.

Causes of Localized Pruritis with Skin Changes:

These include:

Eczema

Psoriasis

Lichen Planus

Dermatitis Herpetiformis

Insect bites

Contact Dermatitis

Urticaria

Angioedema

Causes of Generalized Pruritis with skin Changes:

This is seen in widespread inflammatory skin changes such as:

Widespread eczema

Psoriasis

Scabies

Graft Vs Host Disease

Allergic drug eruption

Pruiritis with Normal Skin:

There are different causes for this:

Infections:

Filariasis,HIV and Hookworm

Malignancy:

Lymphoma,Leukemia,Myeloma

Haematological:

Polycythemia,Iron Deficiency Anemia

Endocrinological Causes:

Diabetes,Myxoedema,Hyperthyroidism

Drugs:Opioids

Chronic Renal Failure

Hodgkin”s Disease

Investigations:

Full Blood Count

CRP

U and Es

ESR

Chest X Ray

Thyroid Function Tests

Serum Glucose

Urine Routine Exam

Skin biopsy

Management :

Treat and Identify the underlying cause.

Aim to suppress the sensation of itch by Medication or Behavioural Therapy.

Apply Cold emollients over the skin lesions.

Topical Local anesthetics are also effective.

Topical and systemic antihistamines canbe fairly effective.

Most commonly Used H1 receptor Antihistamines include:

Cetrizine,Levocetrizine,desloratidine and fexofenadine.