My pa is one mask of brooses both blue and green. Charles Dickens (1812–70), Nicholas Nickleby
Many patients present with the complaint that they bruise easily but only a minority turn out to have an underlying blood disorder. Purpura is bleeding into the skin or mucous membranes, appearing as multiple small haemorrhages that do not blanch on pressure. Smaller purpuric lesions that are 2 mm or less in diameter (pinhead size) are termed petechiae, while larger purpuric lesions are called ecchymoses (see FIG. 39.1).
Purpuric rash (petechiae and ecchymoses)
Bruises are large areas of bleeding that are a result of subcutaneous bleeding. If bruising is abnormal and out of proportion to the offending trauma, then a disturbance of coagulation is suggested (see FIG. 39.2).
Severe bleeding in a diabetic patient with systemic fibrinolysis. Note the bleeding following insulin injections into the abdominal wall and an injection into the shoulder joint.
Source: Photo courtesy Hatem Salem
‘Palpable purpura’ due to an underlying systemic vasculitis is an important differential problem. The petechiae are raised so finger palpation is important. The cause is an underlying vasculitis affecting small vessels (e.g. polyarteritis nodosa).
The decision to investigate is difficult because decisions have to be made about which patients warrant investigation and whether the haemostatic defect is due to local or systemic pathology.1 The ability to identify a bleeding disorder is important because of implications for surgery, pregnancy, medication and genetic counselling.
Key facts and checkpoints
Purpura = petechiae + ecchymoses.
Abnormal bleeding is basically the result of disorders of (1) the platelet, (2) the coagulation mechanism or (3) the blood vessel.
There is no substitute for a good history in the assessment of patients with bleeding disorders.
An assessment of the personal and family histories is the first step in the identification of a bleeding disorder.
When a patient complains of ‘bruising easily’ it is important to exclude thrombocytopenia due to bone marrow disease and clotting factor deficiencies such as haemophilia.
The commonest cause of an acquired bleeding disorder is drug therapy (e.g. aspirin, NSAIDs, cytotoxics and oral anticoagulants).
In general, bleeding secondary to platelet defects is spontaneous, associated with a petechial rash and occurs immediately after trauma or a cut wound.1 The bleeding is usually mucosal (e.g. bleeding from gingiva, menorrhagia, epistaxis and petechiae).
Laboratory assessment should be guided by the clinical impression.
Bleeding caused by coagulation factor deficiency is usually traumatic and delayed (e.g. haemorrhage occurring 24 hours after a dental extraction in a haemophiliac).
The routine screening tests for the investigation of patients with bleeding disorders can occasionally ...
Log In to View More
If you don't have a subscription, please view our individual subscription options below to find out how you can gain access to this content.
Want remote access to your institution's subscription?
Sign in to your MyAccess profile while you are actively authenticated on this site via your institution (you will be able to verify this by looking at the top right corner of the screen - if you see your institution's name, you are authenticated). Once logged in to your MyAccess profile, you will be able to access your institution's subscription for 90 days from any location. You must be logged in while authenticated at least once every 90 days to maintain this remote access.
If your institution subscribes to this resource, and you don't have a MyAccess profile, please contact your library's reference desk for information on how to gain access to this resource from off-campus.
Murtagh Collection Full Site: One-Year Subscription
Connect to a suite of general practice resources from one of the most influential authors in the field. Learn the breadth of general practice, including up-to-date information on diagnosis and treatment, as well as key clinical skills like communication.
Pay Per View: Timed Access to all of Murtagh Collection
48 Hour Subscription $34.95
Pop-up div Successfully Displayed
This div only appears when the trigger link is hovered over.
Otherwise it is hidden from view.