Scoliosis physical examination: Difference between revisions
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{{Scoliosis}} | {{Scoliosis}} | ||
{{CMG}}; AE {{Rohan}} | {{CMG}}; {{AE}} {{Rohan}} | ||
==Overview== | ==Overview== | ||
Patients with [ | Patients with [[scoliosis]] usually appear normal. Physical examination of patients with scoliosis is usually remarkable for [[shoulder]] asymmetry, waist-line asymmetry, [[thoracic wall]] or [[breast]] asymmetry, and truncal decompensation. | ||
==Physical Examination== | ==Physical Examination== | ||
Physical examination of patients with scoliosis is usually remarkable for | {| align="right" | ||
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[[File:Scoliosis physical exam.jpg|300px|thumb|none|Scoliosis physical findings.[https://commons.wikimedia.org/w/index.php?curid=36219861 Source: By https://wellcomeimages.org/indexplus/obf_images/8c/4f/9ae55eeb2f2735757102bb251795.jpg]]] | |||
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Physical examination of patients with [[scoliosis]] is usually remarkable for [[Shoulder|shoulde]]<nowiki/>r asymmetry, waist-line asymmetry, [[thoracic wall]] or [[breast]] asymmetry, and truncal decompensation.<ref>{{cite book | last = Kapoor | first = Sudhir | title = Orthopaedic clinics spine : with video demonstration | publisher = CBS Publishers & Distributors | location = New Delhi | year = 2008 | isbn = 8123915993 }}</ref><ref name="pmid19030463">{{cite journal| author=Janicki JA, Alman B| title=Scoliosis: Review of diagnosis and treatment. | journal=Paediatr Child Health | year= 2007 | volume= 12 | issue= 9 | pages= 771-6 | pmid=19030463 | doi= | pmc=2532872 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19030463 }} </ref><ref>Azar, F., Canale, S., Beaty, J. & Campbell, W. (2017). Campbell's operative orthopaedics. Philadelphia, PA: Elsevier. Page: 1898-2028.</ref> | |||
===Appearance of the Patient=== | ===Appearance of the Patient=== | ||
*Patients with scoliosis usually appear well. | *Patients with [[scoliosis]] usually appear well. | ||
*[[Tanner stage|Tanner staging]] done to predict magnitude of curve progression. | |||
===Vital Signs=== | ===Vital Signs=== | ||
Patients with scoliosis and other complications may have: | Patients with [[scoliosis]] and other complications may have: | ||
* | *[[Hypertension|High blood pressure]] due to [[pulmonary hypertension]] and [[cor pulmonale]] | ||
===Skin=== | ===Skin=== | ||
*[[Skin]] for [[Café au lait spot|café au lait]] spots indicative of [[neurofibromatosis]] | *[[Skin]] for [[Café au lait spot|café au lait]] spots indicative of [[neurofibromatosis]] | ||
*[[Spina bifida]] as evidenced by a [[dimple]], hairy patch, [[lipoma]], or [[hemangioma]] | *[[Spina bifida]] as evidenced by a [[dimple]], hairy patch, [[lipoma]], or [[hemangioma]] | ||
===HEENT=== | ===HEENT=== | ||
* HEENT examination of patients with | *HEENT examination of patients with [[scoliosis]] is usually normal. | ||
===Neck=== | ===Neck=== | ||
* Neck examination of patients with scoliosis is usually normal. But, patients may have lateral bending of their neck due primary or secondary curve. | *Neck examination of patients with [[scoliosis]] is usually normal. But, patients may have lateral bending of their neck due primary or secondary curve. | ||
* when scoliosis is complicated with pulmonary hypertension, it's physical findings may | *when [[scoliosis]] is complicated with [[pulmonary hypertension]], it's physical findings may include: | ||
Prominent 'a' wave: due to forced atrial contraction | **Prominent 'a' wave: due to forced atrial contraction | ||
**Prominent 'v' wave: later if [[Tricuspid regurgitation|tricuspid regurgitation]] develops with [[right ventricular failure]] | **Prominent 'v' wave: later if [[Tricuspid regurgitation|tricuspid regurgitation]] develops with [[right ventricular failure]] | ||
**Elevated [[JVP]]: can be present if [[right ventricular failure]] develops | **Elevated [[JVP]]: can be present if [[right ventricular failure]] develops | ||
Line 52: | Line 38: | ||
===Lungs=== | ===Lungs=== | ||
Patients with scoliosis and other complications may have: | Patients with [[scoliosis]] and other complications may have: | ||
*Chest wall or breast asymmetry is seen | *[[Thoracic cavity|Chest wall]] or [[breast]] asymmetry is seen | ||
* | *Decreased [[breast sounds]] upon auscultation of the [[lung]] | ||
===Heart=== | ===Heart=== | ||
Patients with scoliosis and it's late complications such as pulmonary hypertension and cor pulmonale include physical findings:<ref name="isbn0-7295-3905-9">{{cite book |author=Simon O'Connor MBBS FRACP DDU; Nicholas P. Hirsch MBBS FRCA FRCP |title=Clinical Examination: A Systematic Guide to Physical Diagnosis |publisher=Churchill Livingstone |location=Edinburgh |year=2009 |pages= |isbn=0-7295-3905-9 |oclc= |doi= |accessdate=}}</ref><ref name="isbn0-07-055417-X">{{cite book |author=Alexander, R. McNeill; Hurst, J. Willis; Schlant, Robert C. |title=The Heart, arteries and veins |publisher=McGraw-Hill, Health Professions Division |location=New York |year=1994 |pages= |isbn=0-07-055417-X |oclc= |doi= |accessdate=}}</ref><ref name="isbn0-7020-2993-9">{{cite book |author=Clark, Michael; Kumar, Parveen J. |title=Kumar and Clark's clinical medicine |publisher=Elsevier Saunders |location=St. Louis, Mo |year=2009 |pages= |isbn=0-7020-2993-9 |oclc= |doi= |accessdate=}}</ref> | Patients with [[scoliosis]] and it's late complications such as [[pulmonary hypertension]] and [[cor pulmonale]] include physical findings:<ref name="isbn0-7295-3905-9">{{cite book |author=Simon O'Connor MBBS FRACP DDU; Nicholas P. Hirsch MBBS FRCA FRCP |title=Clinical Examination: A Systematic Guide to Physical Diagnosis |publisher=Churchill Livingstone |location=Edinburgh |year=2009 |pages= |isbn=0-7295-3905-9 |oclc= |doi= |accessdate=}}</ref><ref name="isbn0-07-055417-X">{{cite book |author=Alexander, R. McNeill; Hurst, J. Willis; Schlant, Robert C. |title=The Heart, arteries and veins |publisher=McGraw-Hill, Health Professions Division |location=New York |year=1994 |pages= |isbn=0-07-055417-X |oclc= |doi= |accessdate=}}</ref><ref name="isbn0-7020-2993-9">{{cite book |author=Clark, Michael; Kumar, Parveen J. |title=Kumar and Clark's clinical medicine |publisher=Elsevier Saunders |location=St. Louis, Mo |year=2009 |pages= |isbn=0-7020-2993-9 |oclc= |doi= |accessdate=}}</ref> | ||
*Left parasternal heave | *'''Left [[parasternal heave]]''' | ||
*Palpable P2 | **Due to hyperdynamic right ventricle | ||
*Ausculation | *'''Palpable [[P2]]''' | ||
**Correlates with severity of the disease | |||
*'''Ausculation''' | |||
**First and second heart sound (S1,S2) | **First and second heart sound (S1,S2) | ||
***Loud P2 component of S2: this is due to the forceful closure of the valve because of increased pulmonary pressure. It can be heard mostly in the pulmonary area (upper right sternal border). If it is evident at the cardiac apex, this indicates more severe disease. It is best appreciated on inspiration. | ***Loud P2 component of S2: this is due to the forceful closure of the valve because of increased pulmonary pressure. It can be heard mostly in the pulmonary area (upper right sternal border). If it is evident at the [[Apex of the heart|cardiac apex]], this indicates more severe disease. It is best appreciated on inspiration. | ||
Splitting of S2 | **'''Splitting of S2''' | ||
***Narrowed splitting of S2: in chronic pulmonary hypertension, pulmonary artery compliance decreases leading to earlier pulmonary valve closure and narrowed splitting. | ***Narrowed splitting of S2: in chronic [[pulmonary hypertension]], [[pulmonary artery]] compliance decreases leading to earlier [[pulmonary valve]] closure and narrowed splitting. | ||
***Widened splitting of S2: widened splitting may occur later if right ventricular failure or bundle branch block develops. | ***Widened splitting of S2: widened splitting may occur later if right ventricular failure or bundle branch block develops. | ||
**Extra Heart Sounds | **'''Extra Heart Sounds''' | ||
***S4: due to right ventricular hypertrophy and therefore reduced compliance secondary to pulmonary hypertension. It is increased with inspiration. | ***S4: due to [[right ventricular hypertrophy]] and therefore reduced compliance secondary to [[pulmonary hypertension]]. It is increased with [[Inhalation|inspiration]]. | ||
***S3: if right ventricular failure develops. Increased with inspiration. | ***S3: if [[Right heart failure|right ventricular failure]] develops. Increased with [[inspiration]]. | ||
**Additional Sounds | **'''Additional Sounds''' | ||
Systolic pulmonary ejection click: increased with inspiration | ***Systolic pulmonary ejection click: increased with [[inspiration]] | ||
**Murmurs | **'''Murmurs''' | ||
***Ejection midsystolic murmur: increased with inspiration | ***Ejection [[midsystolic murmur]]: increased with [[inspiration]] | ||
***Diastolic murmur (Graham-Steele murmur): indicates pulmonary regurgitation | ***[[Diastolic murmurs|Diastolic murmur]] (Graham-Steele murmur): indicates pulmonary regurgitation | ||
***Pansystolic murmur: indicates tricuspid regurgitation and developing right ventricular failure | ***Pansystolic [[murmur]]: indicates [[tricuspid regurgitation]] and developing [[Right heart failure|right ventricular failure]] | ||
===Abdomen=== | ===Abdomen=== | ||
* Abdominal examination of patients with [ | *Abdominal examination of patients with [[scoliosis]] is usually normal | ||
*Flank fullness may be seen | |||
* | |||
===Genitourinary=== | ===Genitourinary=== | ||
*Genitourinary examination of patients with scoliosis is usually normal. But, in neuromuscular scoliosis, patient may present with bowel and bladder incontinence. | *Genitourinary examination of patients with [[scoliosis]] is usually normal. But, in [[neuromuscular scoliosis]], patient may present with bowel and bladder [[incontinence]]. | ||
===Neuromuscular (Spine) | ===Neuromuscular (Spine)=== | ||
*Patient is usually oriented to persons, place, and time | *Patient is usually oriented to persons, place, and time | ||
===Gait=== | ====Gait==== | ||
*Patients usually walk with bipedal unassisted gait. | *Patients usually walk with bipedal unassisted [[Gait (human)|gait]]. | ||
*Some patients with neuromuscular scoliosis walk with a spastic gait. | *Some patients with neuromuscular scoliosis walk with a spastic [[Gait (human)|gait]]. | ||
===Palpation==== | ====Palpation==== | ||
*No local rise in temperature | *No local rise in temperature | ||
*Tenderness is usually not present. | *[[Tenderness]] is usually not present. | ||
*Head may be centered or tilted away from pelvis | *Head may be centered or tilted away from pelvis | ||
*Shoulders asymmetry | *[[Shoulders]] asymmetry | ||
*Scapular asymmetry with one scapula being farther away from the the mid-line | *[[Scapula|Scapular]] asymmetry with one scapula being farther away from the the mid-line | ||
*Spinous process are deviated away from mid-line | *[[Spinous process]] are deviated away from mid-line | ||
*Lateral curvature of the spine, with curve described in terms of convexity directed to right or left | *Lateral curvature of the [[spine]], with curve described in terms of convexity directed to right or left | ||
*Paraspinal muscle spasm may be present | *Paraspinal muscle spasm may be present | ||
*Rib razor hump is usually present | *[[Rib]] razor hump is usually present | ||
*Posterior Superior Iliac spine (PSIS) asymmetry seen | *Posterior Superior Iliac spine (PSIS) asymmetry seen | ||
*Anterior Superior Iliac spine (ASIS) asymmetry seen | *Anterior Superior Iliac spine (ASIS) asymmetry seen | ||
*List and step are usually not present | *List and step are usually not present | ||
*Sagittal balance (Head in line with sacrum) may be disturbed | *Sagittal balance (Head in line with sacrum) may be disturbed | ||
*Sinuses and tuft of hair may be present | *[[Sinuses]] and tuft of hair may be present | ||
*Flank fullness may be seen | *Flank fullness may be seen | ||
===Neurological=== | ====Movement==== | ||
*[[Flexion]] and [[extension]] are usually affected | |||
* Lateral flexion and rotation helps to identify [[rigidity]] of the curve | |||
====Flexibility Test==== | |||
*Lateral bending test are usually affected | |||
*[[Traction (orthopedics)|Traction]] test are usually abnormal | |||
*Prone position test are usually abnormal | |||
====Neurological==== | |||
*Motor | *Motor | ||
**Motor weakness may be seen | **Motor [[Muscle weakness|weakness]] may be seen | ||
**Spasticity and rigidity may be seen depending on level of involvement | **[[Spasticity]] and rigidity may be seen depending on level of involvement | ||
**Sensory | **Sensory | ||
***Fine touch and crude touch may be lost | ***Fine touch and crude touch may be lost | ||
*** | ***[[Hypoesthesia]] may be seen | ||
***Postion sense and vibration may be disturbed | ***Postion sense and vibration may be disturbed | ||
***Two point discrimination may be lost | ***Two point discrimination may be lost | ||
**Reflexes | **Reflexes | ||
*** Hypo or Hyper reflexia may be seen depending on level of involvement | *** Hypo or Hyper [[reflexia]] may be seen depending on level of involvement | ||
*** | ***[[Clonus]] may be seen | ||
** | **Coordination | ||
*** | ***[[Motor coordination|Coordination]] may be affected when scoliosis is associated with CNS involvement such arnold-chiari malformation | ||
=== | ====Rib Hump==== | ||
* | *Adam's forward bending test makes the hump prominent | ||
=== | ====Measurement==== | ||
* | *Hump height | ||
* | *[[Chest expansion]] is usually decreased | ||
* | *[[Limb length discrepancy]] may be present | ||
* | *Truncal height is measured in standing and sitting position, which is usually abnormal | ||
* | *Scoliometer is used to measure the curve | ||
====Special Test==== | |||
*'''Straight leg raising (SLR) test''' may be positive | |||
**Test: | |||
***Patient in supine position with [[knee]] and [[Hip (anatomy)|hip]] in [[extension]] | |||
***Elevate the patient's leg in air, so the hip gets gradually flexed with knees in extension | |||
***Presence of radiating pain in the leg between 30-70 degrees of hip flexion indicates a positive test | |||
*'''Cross SLR''' is usually absent | |||
**Test: | |||
***Patient in supine position with [[knee]] and [[Hip (anatomy)|hip]] in [[extension]] | |||
***Elevate the patient's contralateral leg in air, so the hip gets gradually flexed with knees in extension | |||
***Presence of radiating pain in the ipsilateral leg indicates a positive test | |||
*'''Lassegue test''' may be positive | |||
**Test: | |||
***Patient in supine position with [[knee]] and [[Hip (anatomy)|hip]] in [[extension]] | |||
***Elevate the patient's leg in air, so the hip gets gradually flexed with knees in extension | |||
***If radiating pain present in the legs between 30-70 degrees of hip flexion, then slightly lower down the angle of flexion at the hip and dorsiflex the ankle | |||
***Presence of radiating pain in the leg again indicates a positive test | |||
*'''Bowstring test''' may be positive | |||
**Test: | |||
***Patient in supine position with [[knee]] and [[Hip (anatomy)|hip]] in [[extension]] | |||
***Elevate the patient's leg in air, so the hip gets gradually flexed with knees in extension | |||
***If radiating pain present in the legs between 30-70 degrees of hip flexion, then slightly bend the kneewhich will relieve the symptoms | |||
***Apply digital pressure in popliteal fossa over the posterior aspect of sciatic nerve | |||
***Reproduction of radiating pain indicates nerve compression | |||
* | *'''Femoral stretch''' '''test''' may be positive | ||
**Test: | |||
***Patient in prone position with [[knee]] bend to 90 degrees and [[Hip (anatomy)|hip]] in [[extension]] | |||
* | ***Grasp the lower end of the [[femur]] and extend the [[Hip (anatomy)|hip]] | ||
* | ***Presence of pain on the anterior aspect suggests [[Spinal cord compression|compression]] of the [[femoral nerve]] | ||
* | |||
* | |||
* | |||
* | |||
* | |||
* | |||
* | |||
* | |||
===Extremities=== | ====Extremities==== | ||
* | *Feet may show cavovarus deformity | ||
==References== | ==References== | ||
{{Reflist|2}} | {{Reflist|2}} | ||
[[Category:Orthopedics]] | [[Category:Orthopedics]] | ||
[[Category:Skeletal disorders]] | [[Category:Skeletal disorders]] |
Latest revision as of 16:08, 10 December 2018
Scoliosis Microchapters |
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Scoliosis physical examination On the Web |
American Roentgen Ray Society Images of Scoliosis physical examination |
Risk calculators and risk factors for Scoliosis physical examination |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Rohan A. Bhimani, M.B.B.S., D.N.B., M.Ch.[2]
Overview
Patients with scoliosis usually appear normal. Physical examination of patients with scoliosis is usually remarkable for shoulder asymmetry, waist-line asymmetry, thoracic wall or breast asymmetry, and truncal decompensation.
Physical Examination
Physical examination of patients with scoliosis is usually remarkable for shoulder asymmetry, waist-line asymmetry, thoracic wall or breast asymmetry, and truncal decompensation.[1][2][3]
Appearance of the Patient
- Patients with scoliosis usually appear well.
- Tanner staging done to predict magnitude of curve progression.
Vital Signs
Patients with scoliosis and other complications may have:
Skin
- Skin for café au lait spots indicative of neurofibromatosis
- Spina bifida as evidenced by a dimple, hairy patch, lipoma, or hemangioma
HEENT
- HEENT examination of patients with scoliosis is usually normal.
Neck
- Neck examination of patients with scoliosis is usually normal. But, patients may have lateral bending of their neck due primary or secondary curve.
- when scoliosis is complicated with pulmonary hypertension, it's physical findings may include:
- Prominent 'a' wave: due to forced atrial contraction
- Prominent 'v' wave: later if tricuspid regurgitation develops with right ventricular failure
- Elevated JVP: can be present if right ventricular failure develops
- Postive Kussmaul's sign: JVP elevation during inspiration (the opposite of what normally happens) because of right ventricular failure
Lungs
Patients with scoliosis and other complications may have:
- Chest wall or breast asymmetry is seen
- Decreased breast sounds upon auscultation of the lung
Heart
Patients with scoliosis and it's late complications such as pulmonary hypertension and cor pulmonale include physical findings:[4][5][6]
- Left parasternal heave
- Due to hyperdynamic right ventricle
- Palpable P2
- Correlates with severity of the disease
- Ausculation
- First and second heart sound (S1,S2)
- Loud P2 component of S2: this is due to the forceful closure of the valve because of increased pulmonary pressure. It can be heard mostly in the pulmonary area (upper right sternal border). If it is evident at the cardiac apex, this indicates more severe disease. It is best appreciated on inspiration.
- Splitting of S2
- Narrowed splitting of S2: in chronic pulmonary hypertension, pulmonary artery compliance decreases leading to earlier pulmonary valve closure and narrowed splitting.
- Widened splitting of S2: widened splitting may occur later if right ventricular failure or bundle branch block develops.
- Extra Heart Sounds
- S4: due to right ventricular hypertrophy and therefore reduced compliance secondary to pulmonary hypertension. It is increased with inspiration.
- S3: if right ventricular failure develops. Increased with inspiration.
- Additional Sounds
- Systolic pulmonary ejection click: increased with inspiration
- Murmurs
- Ejection midsystolic murmur: increased with inspiration
- Diastolic murmur (Graham-Steele murmur): indicates pulmonary regurgitation
- Pansystolic murmur: indicates tricuspid regurgitation and developing right ventricular failure
- First and second heart sound (S1,S2)
Abdomen
- Abdominal examination of patients with scoliosis is usually normal
- Flank fullness may be seen
Genitourinary
- Genitourinary examination of patients with scoliosis is usually normal. But, in neuromuscular scoliosis, patient may present with bowel and bladder incontinence.
Neuromuscular (Spine)
- Patient is usually oriented to persons, place, and time
Gait
- Patients usually walk with bipedal unassisted gait.
- Some patients with neuromuscular scoliosis walk with a spastic gait.
Palpation
- No local rise in temperature
- Tenderness is usually not present.
- Head may be centered or tilted away from pelvis
- Shoulders asymmetry
- Scapular asymmetry with one scapula being farther away from the the mid-line
- Spinous process are deviated away from mid-line
- Lateral curvature of the spine, with curve described in terms of convexity directed to right or left
- Paraspinal muscle spasm may be present
- Rib razor hump is usually present
- Posterior Superior Iliac spine (PSIS) asymmetry seen
- Anterior Superior Iliac spine (ASIS) asymmetry seen
- List and step are usually not present
- Sagittal balance (Head in line with sacrum) may be disturbed
- Sinuses and tuft of hair may be present
- Flank fullness may be seen
Movement
- Flexion and extension are usually affected
- Lateral flexion and rotation helps to identify rigidity of the curve
Flexibility Test
- Lateral bending test are usually affected
- Traction test are usually abnormal
- Prone position test are usually abnormal
Neurological
- Motor
- Motor weakness may be seen
- Spasticity and rigidity may be seen depending on level of involvement
- Sensory
- Fine touch and crude touch may be lost
- Hypoesthesia may be seen
- Postion sense and vibration may be disturbed
- Two point discrimination may be lost
- Reflexes
- Coordination
- Coordination may be affected when scoliosis is associated with CNS involvement such arnold-chiari malformation
Rib Hump
- Adam's forward bending test makes the hump prominent
Measurement
- Hump height
- Chest expansion is usually decreased
- Limb length discrepancy may be present
- Truncal height is measured in standing and sitting position, which is usually abnormal
- Scoliometer is used to measure the curve
Special Test
- Straight leg raising (SLR) test may be positive
- Cross SLR is usually absent
- Lassegue test may be positive
- Test:
- Patient in supine position with knee and hip in extension
- Elevate the patient's leg in air, so the hip gets gradually flexed with knees in extension
- If radiating pain present in the legs between 30-70 degrees of hip flexion, then slightly lower down the angle of flexion at the hip and dorsiflex the ankle
- Presence of radiating pain in the leg again indicates a positive test
- Test:
- Bowstring test may be positive
- Test:
- Patient in supine position with knee and hip in extension
- Elevate the patient's leg in air, so the hip gets gradually flexed with knees in extension
- If radiating pain present in the legs between 30-70 degrees of hip flexion, then slightly bend the kneewhich will relieve the symptoms
- Apply digital pressure in popliteal fossa over the posterior aspect of sciatic nerve
- Reproduction of radiating pain indicates nerve compression
- Test:
- Femoral stretch test may be positive
- Test:
- Patient in prone position with knee bend to 90 degrees and hip in extension
- Grasp the lower end of the femur and extend the hip
- Presence of pain on the anterior aspect suggests compression of the femoral nerve
- Test:
Extremities
- Feet may show cavovarus deformity
References
- ↑ Kapoor, Sudhir (2008). Orthopaedic clinics spine : with video demonstration. New Delhi: CBS Publishers & Distributors. ISBN 8123915993.
- ↑ Janicki JA, Alman B (2007). "Scoliosis: Review of diagnosis and treatment". Paediatr Child Health. 12 (9): 771–6. PMC 2532872. PMID 19030463.
- ↑ Azar, F., Canale, S., Beaty, J. & Campbell, W. (2017). Campbell's operative orthopaedics. Philadelphia, PA: Elsevier. Page: 1898-2028.
- ↑ Simon O'Connor MBBS FRACP DDU; Nicholas P. Hirsch MBBS FRCA FRCP (2009). Clinical Examination: A Systematic Guide to Physical Diagnosis. Edinburgh: Churchill Livingstone. ISBN 0-7295-3905-9.
- ↑ Alexander, R. McNeill; Hurst, J. Willis; Schlant, Robert C. (1994). The Heart, arteries and veins. New York: McGraw-Hill, Health Professions Division. ISBN 0-07-055417-X.
- ↑ Clark, Michael; Kumar, Parveen J. (2009). Kumar and Clark's clinical medicine. St. Louis, Mo: Elsevier Saunders. ISBN 0-7020-2993-9.