Monday, 4 December 2006

Examination of the peripheral nervous system

The motor system
· Inspection & palpation of muscle groups
· Assessment of tone
· Testing of power
· Elicitation of deep tendon reflexes & plantar responses
· Testing of co-ordination

Inspection & palpation
· Normal variety in muscle bulk & power
· Lower limb musculature symmetrical
· Upper limb musculature more developed in dominant side
· Muscle wasting - Assess distribution. Focal or diffuse. Proximal or distal. Involving peripheral nerve or spinal segment.
· Fasiculations - subcutaneous twitches overlying muscle bellies when muscles are at rest. LMN disease. Brief contraction of single motor units.
· Myoclonus - Sudden, shock-like muscle contraction involving one or more muscle of a whole limb. Focal or diffuse and occur singly or repetitively.
· Choreiform movements - irregular, jerky, semipurposeful. Huntington’s chorea.
· Tics
· Tremor
· Dystonic movements - slow & writhing. Often lead to sustained abnormal contracture & limb posturing
· Pronator drift – ask patient to close eyes and hold out arms with hands supinated. If UMN lesion is present hand will drift into pronation..


Tone
· Ask patient to relax and ‘go floppy’
· Passively flex & extend each joint in turn. Start slowly then more rapidly.
· Upper limbs - test shoulder, elbow joint & wrist joint
· Lower limb - Internal & external rotation of resting leg. Briskly raise knee off leg and watch to see if ankle is also raised.
· Knee clonus - Push patella sharply towards foot and palpate for further jerks.
· Ankle clonus - Support flexed knee with one hand in popliteal fossa so ankle gently rests on the bed. Using other had briskly dorsiflex the foot and sustain the pressure
· Sustained clonus is a sign of UMN damage

Power
· Power is relative to the patient
· Examine muscle groups against contralateral group
· Isometric testing - Patient contracts muscle group & maintains position as examiner tries to overpower group being tested.
· Isotonic testing - Ask patient to put a joint through a range of movement while trying to stop the movement

MRC scale for muscle power
0 - No muscle contraction visible
1 - Muscle contraction visible, but no movement of joint
2 - Joint movement when effect of gravity eliminated
3- Movement sufficient to overcome effect of gravity
4- Movement overcomes gravity plus added resistance
5- Normal power

Deep tendon reflexes
· Biceps jerk - C5, C6
· Triceps jerk - C6, C7
· Supinator jerk - C5, C6
· Knee jerk - L3,L4. Legs must not be in contact
· Ankle jerk - S1
· If difficult have patient grit teeth or pull against hands

Plantar response L5/S1
· Normal - normal plantar flexion of big toe and other toes.
· Positive Babinski sign - dorsiflexion

Clonus
· Rhythmical repetitive plantar flexion and dorsiflexion
· Loss of supraspinal inhibition
· Sharp muscle stretching causing oscillation within circuit of the reflex arc
· Normal – a few beats
· Pathology – asymmetrical or sustained

Hoffman reflex
· Lesion at level of C5/6 – supinator jerk
· Inversion of supinator jerk – flexion of the fingers
· Supinator/biceps often lost
· Can be elicited by ‘flicking’ one finger – all other fingers should flex
· Similar to Babinski

Co-ordination
· Finger-nose test
· Rapid alternating movements
· Heel shin test.

The sensory system
· Proprioception
· Light touch
· Pin prick
· Vibration
· Temperature
· Two point discrimination
· Aim to determine if any modalities are impaired and to determine the site of any lesion

Examination system
· Touch - cotton wool, tissue paper or light touch
· Pain - pin
· Deep pain - squeeze muscle bellies
· Temperature - cool object - tuning fork
· Joint position sense - Start distal. Show patients movements and name them. Close eyes. Avoid guessing.
· Vibration sense - tuning fork
· Two point discrimination

Examination of the abdomen

General points
Approach from right hand side
Ask if patient can lie flat
Lie patient flat on one pillow
Exposure - ideally nipple to knee but realistically only lower garments to about halfway between iliac crest and synthesis pubis

1 - Visual survey
Look for
Pallor
Pigmentation
Jaundice
Spider naevi
Xanthelasma
Parotid swelling
Gynaecomastia
Scratch marks
Tattoos
Abdominal distension
Distended abdominal veins
An abdominal swelling or herniae
Surgical scars
Decreased body hair

2 - Comment on pigmentation

3 - Examine the hands
Dupuytren’s contracture
Clubbing
Leuconychia - white discolouration of the nails
Palmar erythema
Flapping tremor

4 - Pull down lower eyelid
Anaemia
Icterus in sclerae
Xanthelasma
Guttering between eyeball & lower lid is best place to look for pallor or discolouration

5 - inspect mouth
Cyanosis of lips - cirrhosis of liver
Swollen lips - Crohn’s
Telengiectasis - Osler-Weber-Rendu
Patches of pigmentation - Peutz-Jeghers
Mouth ulcers - Crohn’s disease

6 - Lymph nodes & JVP
Palpate neck & supraclavicular fossae for Cervical lymph nodes
If you find lymph nodes palpate axillae & groin for evidence of generalised lymphadenopathy - lymphoma, chronic lymphocytic leukemia
JVP may be enlarged in portal hypertension

7 - gynaecomastua
Palpate for glandular tissue in obese patients

8 - Spider naevi
Distribution of superior vena cava
May be seen on hands, arms, face & back

9 - Scratch marks
Anywhere on body - may be sign of hyperbilirubinaemia or uraemia

10 - Body hair distribution
More in men
Reduced chest hair and axillae hair
Think about facial hair
Examine pubic hair later

11 - Observe the abdomen
Three sections - epigastric, suprapubic & umbilical
Pulsations
Generalised distension - ascities
Swelling in one particular area
Scars or fistulae - ?previous surgery for Crohn’s
Distended abdominal veins - flowing away from umbilicus in portal hypertension. Upwards from groin in IVC obstruction

12 - Palpation
Ensure hands are flat at side of patient
Talk to patient to encourage them to relax
Ask patient if he has any tenderness & tell him to tell you if you hurt him.
1. Systematically examine whole abdomen with light palpation. Use pulps of fingers & gentle flexion of MCP joints with hand flat on abdominal wall
2. Deeper palpation
3. Internal organs. For liver & spleen start in right iliac fossa. Work up to right hypochondrium for liver. Work diagonally across abdomen to left hypochondrium for spleen. Organs felt best against radial border of index finger & pulps of index & middle finger. Organs descend on inspiration so gently press & move hand up to meet them at this time.
4. Kidneys are found by bimanual palpation in each lateral region
Palpation of internal organs is difficult if ascities is present. In such cases press quickly, flexing at wrist joint to displace fluid & palpate the enlarged organ.
Mass in left hypochondrium - spleen or kidney. Kidney - can get above it, can separate it form the costal edge, can bimanually palpate & it has resonant percussion note.
Deep palpation in flanks for ascending & descending colon.
Gentle palpation for aortic aneurysm in midline of abdomen.
Palpate for inguinal lymph nodes
Check hernial orifices
Note pubic hair thickness/distribution

Causes of an enlarged liver - 3C’s
· Cancer
· C2H5OH - alcohol
· Congestive cardiac failure


13 - percussion
Start at nipple moving down
Locate upper edge of liver & spleen
Left lower lateral chest wall may become dull to percussion before enlarged spleen is palpable
Lower palpable edges of both organs. Start percussing in right iliac fossa moving towards appropriate area moving from resonant to dull areas

14 - Shifting dullness
Check flanks for stony dullness - no need to continue with procedure of demonstrating shifting dullness if this is not present
Ask patient with ascities to turn on side - this shifts dullness from upper to lower flank

15 - Auscultation
Of little use in exam situation
Very important as part of full routine
Bowel sounds
Renal artery bruits
Listen for other sounds such as rub over spleen or kidney or a venous hum

16 - External genitalia
Not usually requires in exam but state that you would
Small testes - chronic liver disease

17 - Rectal examination
Abdominal examination is incomplete without rectal exam

I would also like to…
Rigid sigmoidoscopy
Dipstick urine for protein, blood, etc

Examination of the respiratory system

General points
Introduce self to patient
Ask for permission to examine
Have patient reclining at 45o
Have patients chest bare

1 - Inspect from end of bed
General appearance - evidence of weight loss
Severe kyphoscoliosis
Ankylosing spondylitis may be missed when patient is lying down
Breathlessness - at rest or while removing clothes. Use of accessory muscles for breathing. Accessory muscle useage suggests chronic small airways disease, pleural effusion or pneumothorax.
Pursing of lips (chronic small airways obstruction)
Central cyanosis - (cor pulmonale, fibrosing alveolitis, bronchiectasis) Central cyanosis may be difficult to recognise. It is always preferable to look at the oral mucous membranes
Indrawing of intercostal muscles or supraclavicular fossae (hyperinflation or indrawing of the lower ribs on inspiration (due to low, flat diaphragms in emphysema). Localised indrawing of intercostal muscles suggests bronchial obstruction
Scars thoracotomy or radiotherapy field markings

2 - Listen while observing
Expiration - prolonged & difficult. Chronic airways disease.
Additional sounds - wheeze or clicks
Noisy breathing - breathlessness
Difficult & noisy inspiration is usually caused by obstruction of the major bronchi - mediastinal masses, retrosternal thyroid, bronchial carcinoma.
More prolonged, noisy, wheezy expiration os due to chronic small airways obstruction- asthma, bronchitis

3 - Observe movement of the chest wall
Upwards - emphysema
Asymmetrical - fibrosis, collapse, pneumonectomy, pleural effusion, pneumothorax

4 - Inspect hands
Clubbing
Tar staining from tobacco
Coal dust tattoos
Signs of rheumatoid arthritis or systemic sclerosis
Cyanosis - if present check for flapping tremor of CO2 retention


5 - Pulse
If bounding check for flapping tremor

6 - Raised venous pressure
Cor pulmonale or fixed distension of the neck veins (SVC obstruction)

7 - Localise the trachea
Place index finger & ring finger on manubrium sternae over the prominent points on each side. Use middle finger to gently feel the tracheal rings to detect either deviation or a tracheal tug

8 - Check for lympthadenopathy
Carcinoma, TB, lymphoma, sarcoidosis
Cervical region & axillae

9 - Localise apex beat
Difficult if chest hyper-inflated
In conjunction with tracheal deviation this will give evidence of mediastinal shift - collapse, fibrosis, pneumonectomy, effusion, scoliosis

10 - Look for asymmetry
Rest one hand lightly on either side of front of chest to see if there is any reduction of movement - effusion, fibrosis, pneumonectomy, collapse, pneumothorax

11 - Expansion
Grip the chest symmetrically with the fingertips in ribspaces on either side and approximate the thumbs to meet in the middle in a straight horizontal line
Note distance between both thumbs & try to express expansion in centimetres
Assess in both supramammary & inframammary regions.
Better practice to use tape measure
Compare both sides at each level

12 - Percuss chest
Start at supraclavicular fossae & over the clavicles
Percuss over axilla
Few clinicians now map out area of cardiac dullness
Healthy people - dullness behind lower left quarter of sternum which is lost together with normal liver dullness

13 - Tactile vocal fremitus
Check both sides at once with ulnar aspects of hand
Ask patient to say 99

14 Auscultation of breath sounds
Start high at apices
Remember to listen in axillae
Cover both lung fields with bell before using diaphragm
Compare corresponding points on opposite side of chest
Ensure patient breathes with mouth open, regularly & deeply but not noisily
Early inspiratory crackles - chronic bronchitis, asthma
Early & mid-inspiratory & recurring in expiration crackles - bronchiectasis (altered by coughing)
Mid/late inspiratory crackles - restrictive lung disease (fibrosing alveolitis) & pulmonary oedema



15 - Vocal resonance

16 -Examine back
Repeat steps 10 - 15
May help to cross arms in front of patient to pull scapulae apart
Palpate cervical lymph nodes from behind

I would also like to…..
Check peak flow, temperature, bedside spirometry
Look for evidence of Horner’s syndrome & wasting of muscles in one hand
Palpate liver/percuss liver for emphysema

Examination of the cardiovascular system

General points
Introduce yourself
Approach patient from right hand side
Adjust backrest so patient is at 45o to the mattress
Exposure - ask patient to remove shirt, etc.
While taking history look for any signs

1- Inspect from end of bed
Oxygen
Comfort
Inhalers

2 - Visual survey
Is patient
· Breathless
· Cyanosed
· Pale
· Xanthelasma
· Coronary arcus
· Malar flush (mitral stenosis)
· Examine earlobes for creases
Pulsation’s on neck -
· Forceful carotid pulsation’s (Corrigan’s sign in aortic incompetence, vigorous pulsation in coarctation of the aorta). Look for titubation
· Tall sinous venous pulsation’s - congestive cardiac failure, tricuspid incompetence, pulmonary hypertension
Inspect the chest
· Left thoracotomy scar (mitral stenosis) or midline sternal scar (valve replacement)
Look at feet
· Ankle oedema

3 - Inspect the hands
· Assess warmth, sweating & peripheral cyanosis
· Finger clubbing - cyanotic congenital heart disease, subacute bacterial endocarditis
· Splinter haemorrhages - infective endocarditis

4 - Pulses
· Radial - rate & rhythm
· Assess for collapsing pulse - visibly lift arm up. First ask patient if they have any shoulder pain
· Radio-radial delay
· Radio-femoral delay - coarctation of the aorta
· Brachial pulse - slow rising pulse
· Carotid pulse - slow rising pulse

5 - Neck
· Visual survey may already have found interesting points
· Corrigan’s sign - forceful rise & quick fall of carotid pulsation
· (Time individual waves of venous pulsation against opposite carotid. Don’t actually do this. MRCP stuff)
· JVP may move earlobe - tricuspid incompetence
· JVP - assess height of JVP above sternal edge in centimetres

6 - Apex beat
· Localise mid-clavicular line
· Inspect for pulsation
· Palpate
· Vigorous beat place index finger on it for point of maximum impulse (PMI)
· Impulse - palpable, lifting, thrusting or heaving

7 - Palpation of chest
1. Hand from lower left sternal edge to apex beat tapping impulse or thrills over mitral area if present
2. Press hand gently over left parasternal area sustained gentle pressure. If right ventricular hypertrophy is present you will feel the heel of your hand being lifted by the force
3. Palpate pulmonary area - palpable second sound (pulmonary hypertension)
4. Palpate aortic area palpable thrill (aortic stenosis)

8 - Auscultation
· Time first heart sound with either apex beat or carotid
· Position properly for different murmurs
· Mitral diastolic murmurs (mitral stenosis) turn patient onto left side. Use bell of stethoscope
· Early diastolic murmur of aortic incompetence ask patient to lean forward and hold breath in expiration
· ‘Lean forward for me please. Can you breathe out and hold your breath please.’
· Listen for aortic incompetence with bell.

10 Auscultate neck
· Listen for radiation of murmurs & carotid bruits

11 - Auscultate lung bases
· Looking for inspiratory crepitations. Essential part of routine cardiovascular examination. Not normally in exam but should do in breathless patient, aortic stenosis with displaced PMI or if there are signs of heart failure (orthopnoea, pulsus alternans, gallop rhythm)

12 - Check for peripheral oedema
· Sacral & ankle

13 - Palpate liver
· May be pulsatile in some cases

14 - Measure blood pressure
· Particularly important in patients with aortic stenosis (low systolic & narrow pulse pressure) and aortic incompetence (wide pulse pressure)

I would also like to…..
· Palpate abdomen for abdominal aorta
· Palpate peripheral pulses
· Fundoscopy diabetic or hypertensive retinopathy
· Palpate thyroid
· Dipstick urine for protein, glucose, blood, ketones