Diagnosis: examination

Diagnosis

examination

INTRODUCTION

The clinical examination of the patient should start as the patient enters the clinic and is greeted by the clinician. The history and clinical examination are designed to put the clinician in a position to make a provisional diagnosis, or a differential diagnosis. Special tests or investigations may be required to confirm or refine this diagnosis or elicit other conditions. Physical disabilities, such as those affecting gait, and learning disability are often immediately evident as the patient is first seen, and blindness, deafness or speech and language disorders may be obvious. You should also be able to assess the patient’s mood and general wellbeing but, if in any doubt, ask for advice. Other disorders, such as mental problems, may become apparent at any stage. The patient should be carefully observed and listened to during history taking and examination; speech and language can offer a great deal of information about the medical and mental state. Some patients bring written material that can be helpful (e.g. an accurate list of their illnesses and/or medications) and increasingly patients use the internet and come with printouts. Others may bring less meaningful drawings or histories, which have led some to coin the phrase – la maladie du petits papiers – the illness of small pieces of paper. All these factors can help build a picture of the patient and their condition. As a general rule, if you think a patient looks ill, they probably are.

Always remember that the patient has the right to refuse all or part of the examination, investigations or treatment. A patient has the right under common law to give or withhold consent to medical examination or treatment. This is one of the basic principles of healthcare. Patients are entitled to receive sufficient information in a way they can understand about the proposed investigations or treatments, the possible alternatives and any substantial risk or risks, which may be special in kind or magnitude or special to the patient, so that they can make a balanced judgment (UK Health Department, 19.2.99. HSC 1999/031).

There may be cultural sensitivities but, in any case, no examination should be carried out in the absence of a chaperone – preferably of the opposite sex to the practitioner.

GENERAL EXAMINATION

Medical problems may manifest in the fully clothed patient with abnormal appearance or behaviour, pupil size, conscious level, movements, posture, breathing, speech, facial colour, sweating or wasting. General examination may sometimes include the recording of body weight and the ‘vital signs’ of conscious state, temperature, pulse, blood pressure and respiration. The dentist must be prepared to interpret the more common and significant changes evident in the clothed patient.

VITAL SIGNS

Vital signs include conscious state, temperature, pulse, blood pressure and respiration:

image The conscious state: any decrease in this must be taken seriously, causes ranging from drug use to head injury.

image The temperature: the temperature is traditionally taken with a thermometer, but temperature-sensitive strips and sensors are available. Leave the thermometer in place for at least 3 min. The normal body temperatures are: oral 36.6°C; rectal or ear (tympanic membrane) 37.4°C; and axillary 36.5°C. Body temperature is usually slightly higher in the evenings. In most adults, an oral temperature above 37.8°C or a rectal or ear temperature above 38.3°C is considered a fever (pyrexia). A child has a fever when ear temperature is 38°C or higher.

image The pulse: this can be measured manually or automatically (Fig. 2.1). The pulse can be recorded from any artery, but in particular from the following sites:

Pulse rates at rest in health are approximately as follows:

Pulse rate is increased in:

The rhythm should be regular; if not, ask a physician for advice. The character and volume vary in certain disease states and require a physician’s advice.

image The blood pressure: this can be measured with a sphygmomanometer (Fig. 2.2), or one of a variety of machines. With a sphygmomanometer the procedure is as follows: seat the patient; place the sphygmomanometer cuff on the right upper arm, with about 3 cm of skin visible at the antecubital fossa; palpate the radial pulse; inflate the cuff to about 200–250 mmHg or until the radial pulse is no longer palpable; deflate the cuff slowly while listening with the stethoscope over the brachial artery on the skin of the inside arm below the cuff; record the systolic pressure as the pressure when the first tapping sounds appear; deflate the cuff further until the tapping sounds become muffled (diastolic pressure); repeat; record the blood pressure as systolic/diastolic pressures (normal values about 120/80 mmHg, but these increase with age).

image
Fig. 2.2 Sphygmomanometer

OTHER SIGNS

image Weight: weight loss is seen mainly in starvation, malnutrition, eating disorders, cancer (termed cachexia), HIV disease (termed ‘slim disease’), malabsorption and tuberculosis and may be extreme as in emaciation. Obesity is usually due to excessive food intake and insufficient exercise.

image Hands: conditions such as arthritis (mainly rheumatoid or osteoarthritis) (Figs 2.3 and 2.4) and Raynaud phenomenon (Ch. 56; Fig. 2.3), which is seen in many connective tissue diseases, may be obvious. Disability, such as in cerebral palsy, may be obvious (Fig. 2.5).

image
Fig. 2.5 Cerebral palsy

image Skin: lesions, such as rashes – particularly blisters (seen mainly in skin diseases, infections and drug reactions), pigmentation (seen in various ethnic groups, Addison disease and as a result of some drug therapy).

image Skin appendages: nail changes, such as koilonychia (spoon-shaped nails) – seen in iron deficiency anaemia, hair changes, such as alopecia, and finger clubbing (Fig. 2.6), seen mainly in cardiac or respiratory disorders. Nail beds may reveal the anxious nature of the nail-biting person (Fig. 2.7).

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Fig. 2.6 Clubbing
image
Fig. 2.7 Nail biting

Extraoral head and neck examination

The face should be examined for lesions (Table 2.1) and features such as:

Table 2.1

The commoner descriptive terms applied to lesions

Term Meaning
Atrophy Loss of tissue with increased translucency, unless sclerosis is associated
Bullae Visible accumulations of fluid within or beneath the epithelium, >0.5 cm in diameter (i.e. a blister)
Cyst Closed cavity or sac (normal or abnormal) with an epithelial, endothelial or membranous lining and containing fluid or semisolid material
Ecchymosis Macular area of haemorrhage >2 cm in diameter (bruise)
Erosion Loss of epithelium which usually heals without scarring; it commonly follows a blister
Erythema Redness of the mucosa produced by atrophy, inflammation, vascular congestion or increased perfusion
Exfoliation The splitting off of the epithelial keratin in scales or sheets
Fibrosis The formation of excessive fibrous tissue
Fissure Any linear gap or slit in the skin or mucosa
Gangrene Death of tissue, usually due to loss of blood supply
Haematoma A localized tumour-like collection of blood
Keloid A tough heaped-up scar that rises above the rest of the skin, is irregularly shaped and tends to enlarge progressively
Macule A circumscribed alteration in colour or texture of the mucosa
Nodule A solid mass in the mucosa or skin which can be observed as an elevation or can be palpated; it is >0.5 cm in diameter
Papule A circumscribed palpable elevation <0.5 cm in diameter
Petechia (pl. petechiae) A punctate haemorrhagic spot approximately 1–2 mm in diameter
Plaque An elevated area of mucosa >0.5 cm in diameter
Pustule A visible accumulation of free pus
Scar Replacement by fibrous tissue of another tissue that has been destroyed by injury or disease
An atrophic scar is thin and wrinkled
A hypertrophic scar is elevated with excessive growth of fibrous tissue
A cribriform scar is perforated with multiple small pits
Sclerosis Diffuse or circumscribed induration of the submucosal and/or subcutaneous tissues
Tumour Literally a swelling
The term is used to imply enlargement of the tissues by normal or pathological material or cells that form a mass
The term should be used with care, as many patients believe it implies a malignancy with a poor prognosis
Ulcer A loss of epithelium, often with loss of underlying tissues, produced by sloughing of necrotic tissue
Vegetation A growth of pathological tissue consisting of multiple closely set papillary masses
Vesicle Small (<0.5 cm in diameter) visible accumulation of fluid within or beneath the epithelium (i.e. small blister)
Wheal A transient area of mucosal or skin oedema, white, compressible and usually evanescent (AKA urticaria)

Eyes should be assessed for visual acuity and examined for features such as:

Inspection of the neck, looking particularly for swellings or sinuses, should be followed by careful palpation of all cervical lymph nodes and salivary and thyroid glands, searching for swelling or tenderness. The neck is best examined by observing the patient from the front, noting any obvious asymmetry or swelling, then standing behind the seated patient to palpate the lymph nodes (Fig. 2.8). Systematically, each region needs to be examined lightly with the pulps of the fingers, trying to roll the lymph nodes against harder underlying structures:

image Lymph from the superficial tissue of the head and neck generally drains first to groups of superficially placed lymph nodes, then to the deep cervical lymph nodes (Figs 2.92.12 and Table 2.2).

Table 2.2

The cervical lymph nodes and their main drainage areas

Area Draining lymph nodes
Scalp, temporal region Superficial parotid (pre-auricular)
Scalp, posterior region Occipital
Scalp, parietal region Mastoid
Ear, external Superficial cervical over upper part of sternomastoid muscle
Ear, middle Parotid
Over angle of mandible Superficial cervical over upper part of sternomastoid muscle
Medial part of frontal region, medial eyelids, skin of nose Submandibular
Lateral part of frontal region, lateral part of eyelids Parotid
Cheek Submandibular
Upper lip Submandibular
Lower lip Submental
Lower lip, lateral part Submandibular
Mandibular gingivae Submandibular
Maxillary teeth Deep cervical
Maxillary gingivae Deep cervical
Tongue tip Submental
Tongue, anterior two-thirds Submandibular, some midline cross-over of lymphatic drainage
Tongue, posterior third Deep cervical
Tongue ventrum Deep cervical
Floor of mouth Submandibular
Palate, hard Deep cervical
Palate, soft Retropharyngeal and deep cervical
Tonsil Jugulodigastric

image Parotid, mastoid and occipital lymph nodes can be palpated simultaneously using both hands.

image Superficial cervical lymph nodes are examined with lighter fingers as they can only be compressed against the softer sternomastoid muscle.

image Submental lymph nodes are examined by tipping the patient’s head forward and rolling the lymph nodes against the inner aspect of the mandible.

image Submandibular lymph nodes are examined in the same way, with the patient’s head tipped to the side which is being examined. Differentiation needs to be made between the submandibular salivary gland and submandibular lymph glands. Bimanual examination using one hand beneath the mandible to palpate extraorally and with the other index finger in the floor of the mouth may help.

image The deep cervical lymph nodes which project anterior or posterior to the sternomastoid muscle can be palpated. The jugulodigastric lymph node in particular should be specifically examined, as this is the most common lymph node involved in tonsillar infections and oral cancer.

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Feb 12, 2015 | Posted by in Oral and Maxillofacial Pathology | Comments Off on Diagnosis: examination
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