In performing the clinical examination we need a place to start. The hands are the answer. Start by shaking the patient’s hand in greeting and the rest will follow. We need to remember how invasive an examination is for the patient and also remember how necessary it is. The clinical examination should progress smoothly from one part to the next. Let’s start now, with the hands.
Feel the palms. Are they moist? Is this nervousness? Could it be secondary to thyrotoxicosis? Is there a tremor and are there eye signs of the latter? Does the patient have difficulty letting go of the handshake? Rare as this is, it is some kind of myotonica, think Dystrophia Myotonica.
LOOK AT THE HANDS
Are they enlarged, as in acromegaly?
Are they distorted as in arthritis?
- Ulnar deviation
- Boutonnierre deformity
- Swan neck deformity
- Z deformity of the thumb
- Heberden’s nodes(DIP joint)
- Bouchard’s nodes (PIP joint)
Are the fingers sausage shaped?
- Think of Psoriatic arthropathy and Reiter’s disease
Is there finger shortening?
- beware not to miss destructive arthritis (arthritis mutilans) of psoriatic disease
Is there wasting of the palm, or other part of the hand?
Are the fingers held abnormally?
The MEDIAN nerve controls the Lumbricals 1 & 2 as well as the thenar muscles OAF (Opponens pollicis, Abductor pollicis brevis and Flexor pollicis brevis)So together the LOAF muscles.
The ULNAR nerve supplies all other small muscles of the hand.
The Benediction Sign or Pope’s Hand results from the inability to flex the 2nd and 3rd digits at the metacarpophalangeal joints, due to the lumbricals not being innervated. This is as a result of median nerve injury at the level of the elbow. The same sign is sometimes incorrectly used, for the claw-like hand of ulnar nerve damage. In the ulnar claw hand, the 4th and 5th digits are extended at the metacarpophalangeal joints(MCPJ) and flexed at the interphalangeal joints.
To distinguish between a median and ulnar nerve lesion, ask the patient to clench the hand into a fist. The patient with a median nerve injury CANNOT CLENCH THE FIST as the index and middle finger cannot be flexed by the lumbricals. With median nerve lesions, the more proximal the lesion, the greater the deformity. With ulnar nerve lesions, there is the ‘ulnar nerve paradox’, where the more distal lesion causes the greatest deformity.
In Ochsner’s clasping test ask the patient to clasp their fingers together, with a median nerve injury, the index finger does not flex at the MCPJ.
In Froment’s Sign you ask the patient to grasp a piece of paper between the thumb and the lateral aspect of the forefinger. Loss of power to adductor pollicis (supplied by a deep branch of the Ulnar nerve) of the thumb will cause flexion of the distal thumb as Flexor policies longs compensates.
Look for Dupuytren’s contracture, usually causing flexion of the ring finger(but may also be of the 5th finger). It results from thickening of the palmar fascia and may be familial, or occur secondary to trauma, or be related to alcoholism(not liver disease)
NEXT LOOK AT THE NAILS.
So much can be diagnosed by looking at the nails; cardiac disease, liver disease, renal disease and more.
Look for the following three characteristics:
Red Nails– think of polycythaemia or carbon monoxide poisoning
Blue Nails – think cyanosis and Wilson’s disease
Yellow Nails – These are the result of hypoplasia of the lymphatic system. The distal nail is separated.
There is a loss of hyponychial angle ie., between the nailed bed and the finger. There are many causes of clubbing, all easily found in the examination textbooks. I remember 2 causes in each system for clubbing.
- Cyanotic Congenital Heart Disease
- Infective Endocarditis
- Abscess including empyema and bronchiectasis
- Inflammatory Bowel Disease
Also UNILATERAL CLUBBING, remember the following:
- Bronchial arteriovenous aneyrysm
- Axillary Artery aneurysm
These are painless lesions that look like a splinter under the nail. Causes include: trauma, infective endocarditis, Raynauds’s Disease and vasculitis. A splinter haemorrhage under one nail may be due to trauma, however, if they appear on more than one digit, think of systemic disease.
The nail lifts from the nail bed. It occurs in Psoriasis and Thyrotoxicosis and may also occur in infection and trauma, although traumatic causes are localised to the affected nail(s).
There are three patterns to look for in the nail:
Beau’s Lines These are transverse depressed ridges, that occur in Infection, Hypocalcaemia, post surgery, post chemotherapy, post Kawasaki’s Disease and in myocardial infarction. They are believed to be causes by a temporary cessation of cell division in the nail.
Muehrcke’s Lines These are hypo pigmented, or opaque transverse bands, but are NOT depressed. They are white bands that run parallel to the lunula and in a transverse manner. They are caused by decreased protein synthesis, or in times of significant illness. Causes include, hypoalbuminaemia, nephrotic syndrome, during chemotherapy or other acute illness.
Mee’s Line They are a single transverse white line that has no depression. They are produced during times of significant metabolic stress. Causes include arsenic poisoning, thallium, renal disease, cardiac failure and malignancy. (Image reference: The Lancet, Volume 372, Issue 9647, Page 1410, 18 October 2008)
The hand examination is now complete.
I would next move to the arm. The first part is to palpate the radial artery at the wrist, look for radial-radial and radio-femoral delay,slide the hand up to the epitrochlear node, the axillary nodes, take the blood pressure and more…..but this is in the next part.
Examination of the hand; it takes less than a minute and gives a wealth of information about the patient.