January 29, 2010 by badgett
The current study validates a prior symptom index developed by Goff (PMID: 17154394) and consensus critiera for prompting testing for ovarian cancer promoted by the Gynecologic Cancer Foundation (GCF), the Society of Gynecologic Oncologists (SGO), and the American Cancer Society (ACS). The current study reports test accuracy similar to the prior reports, but the current study adds the analyses that the societies failed to do: projecting the positive predictive values based on a the prevalence of ovarian cancer found in the Prostate, Lung, Colorectal and Ovarian (PLCO) cancer screening trial (PMID: 16260202). Not surprisingly, with such a low prevalence of cancer in the general population, the predictive values of these tests are all less than 1%. This study demonstrates a case of specialty societies prematurely promoting testing for their diseases.
Diagnostic accuracy for symptoms starting within the past year and an estimated prevalence of ovarian cancer of 60 per 100,000 women (0.06 %).
| Symptom (starting in the last year) |
Sensitivity (%)
(early stage – late stage dz) |
Specificity (%) |
Positive predictive value |
| Pelvic or abdominal pain |
49 to 52
|
97
|
< 1%
|
| Bloating or feeling full |
44 to 58
|
97
|
< 1%
|
| Urinary frequency or urgency |
30 to 30
|
96
|
< 1%
|
| Symptom index (any of the above at least daily for at least 1 week in the last year) PMID: 17154394 |
62 to 71
|
95
|
< 1%
|
| Consensus criteria (any of the above at least daily for at least 1 month in the last year) PMID: 17848663 |
59 to 69
|
94
|
< 1%
|
Citation
Rossing, M., Wicklund, K., Cushing-Haugen, K., & Weiss, N. (2010). Predictive Value of Symptoms for Early Detection of Ovarian Cancer JNCI Journal of the National Cancer Institute DOI: 10.1093/jnci/djp500
Posted in Gynecology | Leave a Comment »
January 28, 2010 by badgett
In this study of 55 patients, the authors studied five findings and concluded, “The cut point of 3 or more positive of 5 tests can confirm the diagnosis…, while less than 3 positive of 5 rules out.” If you look at the accuracies and the predictive values below, I think you will agree these results are overstated and not very helpful clinically. The shoulder is still very hard to examine.
Diagnostic Accuracy for Impingement Shoulder Tests
among 55 patients with a prevalence of impingement of 29%
| Finding |
Sensitivity (%) |
Specificity (%) |
Kappa |
Positive
predictive value |
Negative
predictive value |
| Hawkins-Kennedy |
63
|
62
|
.39
|
40
|
61
|
| Neer |
81
|
54
|
.40
|
42
|
13
|
| Painful arc |
75
|
67
|
.45
|
48
|
13
|
| Empty can (Jobe) |
50
|
87
|
.47
|
61
|
19
|
| External rotation resistance |
56
|
87
|
.67
|
64
|
17
|
| 3 or more of 5 findings positive |
75
|
74
|
|
54
|
12
|
How to do the tests
YouTube videos demonstrating the tests
Citation
Michener LA, Walsworth MK, Doukas WC, & Murphy KP (2009). Reliability and diagnostic accuracy of 5 physical examination tests and combination of tests for subacromial impingement. Archives of physical medicine and rehabilitation, 90 (11), 1898-903 PMID: 19887215
Posted in Orthopedics | Leave a Comment »
November 22, 2009 by badgett
Does This Patient With Palpitations Have a Cardiac Arrhythmia?
This systematic review by the Rational Clinical Examination found that an arrhythmia was more likely (LR > 2) if that patient has:
- A history of cardiac disease (likelihood ratio [LR], 2.03; 95% CI, 1.33-3.11)
- Palpitations affected by sleeping (LR, 2.29; 95% CI, 1.33-3.94)
- Palpitations while at work (LR, 2.17; 95% CI, 1.19-3.96)
A arrhythmia was less likely (LR < 0.5) if that patient has:
- A known history of panic disorder (LR, 0.26; 95% CI, 0.07-1.01)
- Palpitations lasting less than 5 minutes (LR, 0.38; 95% CI, 0.22-0.63)
Additional findings that need further discussion are:
- Description by the patient of an irregular heart rate was an independent predictor of a cardiac arrhythmia(PMID: 8629647). The authors of the systematic review did not conclude this finding was helpful because the likelihood ratio, while significant, was within 0.5 to 2.0.
- An increased number of symptoms suggested psychiatric causes in the univarate, but not multivariate analysis of Weber (PMID: 8629647). This finding is part of a theme in general that the more symptoms are present the more likely there is an underlying psychiatric diagnosis in the evaluation of syncope (PMID: 17397948) and symptoms in general in primary care (PMID: 7987511).
This has been added to http://en.citizendium.org/wiki/Palpitation.
Citation:
Thavendiranathan, P., Bagai, A., Khoo, C., Dorian, P., & Choudhry, N. (2009). Does This Patient With Palpitations Have a Cardiac Arrhythmia? JAMA: The Journal of the American Medical Association, 302 (19), 2135-2143 DOI: 10.1001/jama.2009.1673 – PMID 19920238
Posted in Cardiology | Leave a Comment »
November 22, 2009 by badgett
Association of physical examination with pulmonary artery catheter parameters in acute lung injury
The authors found that physical findings had good specificity in predicting low cardiac index (CI) and low central oxygenation; however, at the low prevalence of low CI in this study, even when all three physical findings were present, the positive predictive value was 40%.
This cross sectional study looked at three physical findings (delayed capillary refill time, knee mottling, and cool skin temperature) in predicting cardiac index, central venous oxygen saturation (ScvO2 –
a quality measure of IHI), and mixed venous oxygen saturation (SvO
2) among 392 patients with acute lung injury studied by
ARDSNet.
Results:
For cardiac index < 2.5 (similar results for the measures of oxygenation):
|
Sensitivity |
Specificity |
Predictive values at prevalence of 8% |
| Positive |
Negative |
| Any one of three findings present |
52% |
78% |
17% |
95% |
| All three findings present |
12% |
98% |
40% |
93% |
Did not look at proportional pulse pressure < 25% which has previously been found to be predictive (PMID:
2913385; PMID:
11420761)
Citation:
Grissom CK, Morris AH, Lanken PN, Ancukiewicz M, Orme JF Jr, Schoenfeld DA, Thompson BT, & National Institutes of Health/National Heart, Lung and Blood Institute Acute Respiratory Distress (2009). Association of physical examination with pulmonary artery catheter parameters in acute lung injury. Critical care medicine, 37 (10), 2720-6 PMID: 19885995
Posted in Cardiology, Intensive care | Leave a Comment »
November 11, 2009 by badgett
The medical history taking and physical examination each contributed to 10% of self-reported errors by internal medicine and emergency medicine physicians. This combined rate of 20% is a little higher than a prior report of 10% (PMID: 16009864).
This has been added to Citizendium: Physical_examination - Importance_of_the_physical_examination.
Citation:
Schiff, G., Hasan, O., Kim, S., Abrams, R., Cosby, K., Lambert, B., Elstein, A., Hasler, S., Kabongo, M., Krosnjar, N., Odwazny, R., Wisniewski, M., & McNutt, R. (2009). Diagnostic Error in Medicine: Analysis of 583 Physician-Reported Errors Archives of Internal Medicine, 169 (20), 1881-1887 DOI: 10.1001/archinternmed.2009.333
Posted in Diagnostic error | Leave a Comment »
October 20, 2009 by badgett
Dysphagia among stroke patients is suggested by the following test:
- First check the patient for “swallowing complaints, abnormalities of voice quality, facial asymmetry, or either expressive or receptive aphasia.” If none is detected then go to step 2.
- Have the patient drink 10 mL of water from a cup without a straw while seated upright while oxygenation saturation is monitored during and for 2 minutes after the test. Check whether the patient
- “Coughed or choked during the water drinking or had a change in voice quality after the swallow”.
- Oxygenation drops by 2% or more.
In this small study of 84 patients, this two-step test detected 96% of patients with dysphagia as compared to testing by a speech pathologist.
This had been added to http://en.citizendium.org/wiki/Dysphagia.
Citation:
Turner-Lawrence DE, Peebles M, Price MF, Singh SJ, & Asimos AW (2009). A feasibility study of the sensitivity of emergency physician Dysphagia screening in acute stroke patients. Annals of emergency medicine, 54 (3) PMID: 19362752
Posted in Neurology | Leave a Comment »
October 20, 2009 by badgett
The preferred locations for testing according to this systematic review are filled green in the image. As the independent addition of the monofilament to visually inspecting for deformities, pressure marks, cracked skin, infected nails, evidence of prior ulcers, and other findings is not clear in the major trial of screening (http://pubmed.gov/8498761), it seems we should limit our time to testing three points rather than 10.
This has been added to http://en.citizendium.org/wiki/Diabetic_neuropathy#Screening
Citation:
Feng Y, Schlösser FJ, & Sumpio BE (2009). The Semmes Weinstein monofilament examination as a screening tool for diabetic peripheral neuropathy. Journal of vascular surgery : official publication, the Society for Vascular Surgery [and] International Society for Cardiovascular Surgery, North American Chapter, 50 (3) PMID: 19595541
Posted in Diabetes, Neurology | Leave a Comment »
September 18, 2009 by badgett
The authors report that in 2106 consecutive patients 65 years or older admitted for syncope, “Postural blood pressure (BP) recording, performed in only 38% of episodes, had the highest yield with respect to affecting diagnosis (18%-26%) or management (25%-30%) and determining etiology of the syncopal episode (15%-21%).”
- The lower percentages are based on ’strict criteria’ for abnormal changes:
- drop in systolic BP of at least 20 mm Hg
- or
- drop in diastolic BP of at least 10 mm Hg
- The higher percentages are based on ‘loose criteria’ for abnormal changes:
- drop in systolic or diastolic BP of at least 10 mm Hg
- or
- systolic BP drop to 90 mm Hg or lower
A systematic review of postural blood pressure measurements has been published by the Rational Clinical Examination (McGee S, Abernethy WB, Simel DL The rational clinical examination. Is this patient hypovolemic? JAMA 1999;281 (11):1022-9. DOI:10.1001/jama.281.11.1022 PMID: 10086438 ) Their meta-analysis concluded that the following changes may occur in normal, euvolemic adults:
- Pulse increase:11 (95CI: 9-13mm Hg)
- Systolic blood pressure drop: 4 (95CI: 2 – 6mm Hg)
- Diastolic blood pressure drop: 5 (95CI: 3 – 8 mm Hg)
Based on the Rational Clinical Examination review, which reveals how difficult it is to interpret orthostatic vital signs and that we cannot simply dichotomize the results into normal and abnormal, I think the strict criteria are better. Even with these criteria, orthostatic vital signs was the most important part of the evaluation for syncope.
This has been added to http://en.citizendium.org/wiki/Syncope and http://wiki.medpedia.com/Clinical:Syncope.
Citation:
Mendu ML, McAvay G, Lampert R, Stoehr J, & Tinetti ME (2009). Yield of diagnostic tests in evaluating syncopal episodes in older patients. Archives of Internal Medicine, 169 (14), 1299-305 PMID: 19636031
Posted in Cardiology, Neurology, Syncope | Leave a Comment »
September 18, 2009 by badgett
This comprehensive systematic review by the
Rational Clinical Examination is very helpful after a few adjustments. First, the review allows source studies to place patients with symptoms of irritable bowel who are found to have diverticulosis or polyps into the category of underlying organic illness. Patients with diverticulosis who have symptoms of irritable bowel probably have irritable bowel syndrome.(PMID:
3717113) Likewise, polyps seem very unlikely to cause symptoms of irritable bowel and these patients also probably irritable bowel syndrome and coincidental polyps. Now that the USPSTF recommends screening for polyps starting at age 50, the presence of polyps among patients with irritable bowel syndrome is less important.(PMID:
18838716)
The review cites the study of Bellentani (PMID:
2289644) to conclude that 60% of patients in primary care with symptoms of irritable bowel have irritable bowel syndrome. However, if you group the patients with polyps or diverticulosis with the patients with irritable bowel, the prevalence becomes
87%.
Diagnosing irritable bowel syndrome
|
Likelihood ratio + |
Likelihood ratio - |
| History alone (Manning criteria) |
2.9 |
0.29 |
| History and physical examination (Rome criteria) |
4.8 |
0.34 |
| History, physical examination, and laboratory tests (Kruis score) |
8.6 |
0.26 |
Thus, the Kruis score seems good enough to diagnose irritable bowel among patients in primary care (remember that patients over age 50 probably need endoscopy to screen for polyps). The composition of the Kruis score is:
Kruis score. Abnormal is < 44
| Finding |
Score |
| Abdominal pain or flatulence or bowel irregularity |
34 |
| Duration of symptoms >2 y |
16 |
| Abdominal pain is “burning, cutting, very strong, terrible, feeling of pressure, dull, boring, not so bad” |
23 |
| Alternating constipation and diarrhea |
14 |
| History of blood in stool |
-98 |
| Physical examination or history pathognomonic for an alternative diagnosis |
-47 |
| ESR > 10 mm/hr |
-13 |
| WBC > 10k |
-50 |
| Hemoglobin < 12 g/dL for females or < 14 g/dL for males |
-98 |
Citation:
Ford, A., Talley, N., Veldhuyzen van Zanten, S., Vakil, N., Simel, D., & Moayyedi, P. (2008). Will the History and Physical Examination Help Establish That Irritable Bowel Syndrome Is Causing This Patient’s Lower Gastrointestinal Tract Symptoms? JAMA: The Journal of the American Medical Association, 300 (15), 1793-1805 DOI: 10.1001/jama.300.15.1793
Tags: Irritable bowel
Posted in Gastroenterology | Leave a Comment »
September 18, 2009 by badgett
The presence of chest pain during EKG does not improve its negative predictive value. Academic Emergency Medicine 2009.
The authors detail the findings of 387 consecutive patients with normal electrocardiograms admitted for a chief complaint of chest pain. The authors report that 17% (67/387) of patients had acute coronary syndrome ACS). However, the authors define ACS as:
- Unstable angina. Either:
- 70% stenosis (38 patients)
- positive stress test (1 patient)
- NSTEMI.
- Positive troponin (28 patients)
The definition of unstable angina is unusual, differs from the definitions of the American Heart Association, and may include patients without acute ischemia who have a stable stenosis. Focusing on the patients with NSTEMI, the authors found:
- Among 261 patients with electrocardiogram taken during pain, 18 (7%) had NSTEMI.
- Among 126 patients with electrocardiogram not taken during pain, 10 (8%) had NSTEMI.
This study independently confirms the findings of an earlier study (PMID
16973638) that the presence of chest pain during a normal electrocardiogram does not adequately exclude NSTEMI among a group of patient that physicians chose to admit the hospital and had a 7% prevalence of NSTEMI.
This does not mean the electrocardiogram cannot help exclude acute coronary syndrome, but means that whether the electrocardiogram is taken during pain is not important.
This does not mean the electrocardiogram cannot exclude acute coronary syndrome in patients at lower risk such as those with unusual pain and no history of ischemic heart disease (PMID
3970650).
This has been added to http://en.citizendium.org/wiki/Acute_coronary_syndrome#Electrocardiogram
Citation:
Turnipseed, S., Trythall, W., Diercks, D., Laurin, E., Kirk, J., Smith, D., Main, D., & Amsterdam, E. (2009). Frequency of Acute Coronary Syndrome in Patients with Normal Electrocardiogram Performed during Presence or Absence of Chest Pain Academic Emergency Medicine, 16 (6), 495-499 DOI: 10.1111/j.1553-2712.2009.00420.x
Tags: Chest pain, electrocardiogram
Posted in Cardiology | Leave a Comment »
