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Research ArticleOriginal ResearchA

Causes of Persistent Dizziness in Elderly Patients in Primary Care

Otto R. Maarsingh, Jacquelien Dros, François G. Schellevis, Henk C. van Weert, Danielle A. van der Windt, Gerben ter Riet and Henriette E. van der Horst
The Annals of Family Medicine May 2010, 8 (3) 196-205; DOI: https://doi.org/10.1370/afm.1116
Otto R. Maarsingh
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Jacquelien Dros
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François G. Schellevis
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Henk C. van Weert
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Danielle A. van der Windt
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Gerben ter Riet
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Henriette E. van der Horst
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Abstract

PURPOSE Although dizzy patients are predominantly seen in primary care, most diagnostic studies on dizziness have been performed among patients in secondary or tertiary care. Our objective was to describe subtypes of dizziness in elderly patients in primary care and to assess contributory causes of dizziness.

METHODS We performed a cross-sectional diagnostic study among elderly patients in the Netherlands consulting their family physician for persistent dizziness. All patients underwent a comprehensive evaluation according to a set of diagnostic tests that were developed during an international Delphi procedure. Data for each patient were independently reviewed by a panel consisting of a family physician, a geriatrician, and a nursing home physician, which resulted in major and minor contributory causes of dizziness.

RESULTS From June 2006 to January 2008, we included 417 patients aged 65 to 95 years. Presyncope was the most common dizziness subtype (69%). Forty-four percent of the patients were assigned more than 1 dizziness subtype. Cardiovascular disease was considered to be the most common major contributory cause of dizziness (57%), followed by peripheral vestibular disease (14%), and psychiatric illness (10%). An adverse drug effect was considered to be the most common minor contributory cause of dizziness (23%). Sixty-two percent of the patients were assigned more than 1 contributory cause of dizziness.

CONCLUSIONS Contrary to most previous studies, cardiovascular disease was found to be the most common major cause of dizziness in elderly patients in primary care. In one-quarter of all patients an adverse drug effect was considered to be a contributory cause of dizziness, which is much higher than reported in previous studies.

  • Dizziness, diagnosis
  • primary care
  • family practice
  • elderly

INTRODUCTION

Dizziness is common in elderly people; 30% of people older than 65 years experience dizziness in some form,1–4 increasing to 50% in the very old (older than 85 years).1 For clinicians, dizziness often represents a diagnostic problem: it is a subjective sensation that depends on self-report, it may refer to several different and overlapping sensations, and it can be caused by a wide range of benign or serious conditions.5,6 In 20% to 40% of dizzy patients in primary care, the underlying cause remains unknown.7–9

Patients with dizziness are managed largely at primary care level.10 From 1985 to 1995, Dutch family physicians referred only 3% of dizzy elderly patients to a medical specialist.11 Most diagnostic studies on dizziness, however, have been performed among patients seen in emergency departments8,12,13 or in a secondary or tertiary care setting.5,14–19 Because of selective referral, the distribution of diagnoses in secondary and tertiary care patients is probably different from patients in primary care (spectrum variation). This skewed distribution hampers the application of findings from secondary and tertiary care research to patients in primary care. The objective of this study was to describe subtypes of dizziness in elderly patients in primary care and to assess the contributory causes of dizziness.

METHODS

Setting and Patients

Participants were recruited among consecutive patients seen by 45 family physicians in 24 Dutch family practices. Patients aged 65 years or older consulting their family physician for dizziness that had been present for at least 2 weeks were invited to participate. Additionally, each month the electronic databases of all practices were searched retrospectively for any dizzy patients the family physicians had failed to invite (Supplemental Appendix 1, available at http://annfammed.org/cgi/content/full/8/3/196/DC1). These patients received a written invitation to participate in the study. Informed consent was obtained from all participants. Our definition of dizziness included a giddy or rotational sensation, a loss of balance, a faint feeling, light-headedness, instability or unsteadiness, a tendency to fall, or a feeling of everything turning black.6 Criteria for exclusion were the inability to speak Dutch or English, severe cognitive impairment, severe visual impairment (ie, corrected visual acuity of less than 3/60 [Snellen metric] in the best eye), severe hearing impairment (ie, verbal communication impossible), or wheelchair dependency.

Patients were enrolled from June 2006 to January 2008, and the study protocol was approved by the Medical Ethics Committee of the VU University Medical Center.

Evaluation

All patients underwent a standardized, comprehensive evaluation based on a set of diagnostic tests that were developed during an international Delphi procedure.20 The patients were examined in a family practice setting by 2 study authors (O.R.M., J.D.) and 3 well-trained physicians. Patients not able to visit the practice for medical reasons were examined at home.

Medical History

We recorded sociodemographic characteristics, smoking habits, alcohol intake, current medication use (including the use of fall–risk-increasing drugs [FRID]),21,22 medical history, characteristics of dizziness, and the use of a hearing, seeing, or walking aid. All patients had to complete the Primary Care Evaluation of Mental Disorders (PRIME-MD) Patient Health Questionnaire (PHQ), a self-administered instrument to assess psychiatric disorders,23,24 and the Dizziness Handicap Inventory, a questionnaire used to quantify the impact of dizziness on everyday life.25

Physical Examination and Additional Diagnostic Tests

Diagnostic criteria are displayed in Supplemental Appendix 2, available at http://annfammed.org/cgi/content/full/8/3/196/DC1. Cardiovascular examination consisted of measurement of pulse and blood pressure, the orthostatic hypotension test, and auscultation of the heart. For the orthostatic hypotension test we measured blood pressure after 5 minutes in supine position, then measured it again in a standing position after 1, 2, 3, 4, and 5 minutes.26,27 Additional cardiovascular assessment was performed on indication. Electrocardiography (ECG) was indicated if (1) a patient complained of presyncopal dizziness (faint feeling, light-headedness, or feeling everything turning black), (2) dizziness was accompanied by palpitations, or (3) exercise provoked complaints of dizziness. Patient-activated continuous-loop event recording (CER) was indicated if an ECG did not indicate a clear explanation.28 For financial reasons, we only performed CER for the first 60 such consecutive patients.

Evaluation of the locomotor system consisted of orthopedic screening of the lower limbs, tandem gait,29 and the timed up-and-go test (a test used to quantify functional mobility).30 Neurological evaluation consisted of examination of tendon reflexes and the Semmes-Weinstein monofilament test (5.07/10 g) to detect peripheral neuropathy.31–33 Evaluation of the vestibular system consisted of otoscopy, the Dix-Hall-pike maneuver,34–36 and audiometry.37 Visual acuity was measured by means of a well-lit eye chart with Landolt rings. Laboratory evaluation included the measurement of hemoglobin level38 and non–fasting blood glucose.39

Determination of Subtype and Cause of Dizziness

To reduce investigator bias, we asked a panel of clinicians to assign subtype(s) and cause(s) of dizziness to all patients.9 Data for each patient (including medical history, physical examination, and additional diagnostic tests) were recorded on a standardized form, which was independently reviewed by 3 clinicians representing different medical disciplines: a family physician, a geriatrician, and a nursing home physician. The reviewers did not meet to avoid domination by 1 of the reviewers.40 For each patient, the panel was asked to assess the dizziness subtype(s), and the contributory cause(s) of dizziness (in predefined categories as well as in words). Supplemental Appendix 3, available at http://annfammed.org/cgi/content/full/8/3/196/DC1 shows the score form used by the reviewers.

First, the reviewers assigned a predefined dizziness subtype to each patient, either vertigo, presyncope, disequilibrium, other dizziness, or a (specified) combination of subtypes.6,15 After all patients had been assessed, we assigned a definite dizziness subtype, or combination of subtypes, to each patient by means of a majority decision (at least 2 of the 3 reviewers had to agree). Second, the reviewers estimated the relative contribution (from 0% to 100%) of 9 categories of possible causes of dizziness6,15,41–43: (1) adverse drug effect, (2) cardiovascular disease (including cerebrovascular disease), (3) locomotor disease, (4) metabolic or endocrine conditions, (5) neurological disease (excluding cerebrovascular disease), (6) psychiatric illness, (7) peripheral vestibular disease, (8) impaired vision, and (9) other causes. The contribution of each of the 9 causes was calculated as a mean percentage across the 3 reviewers, with the restriction that a cause could contribute only if at least 2 reviewers estimated the relative contribution to be more than 0%. For each patient we considered the cause with the highest mean percentage to be the major cause, whereas all other causes with a mean percentage of at least 10% were considered minor causes. Causes with a mean percentage of less than 10% were considered noncontributing.

Finally, we asked the panel to describe in words the most probable cause of dizziness.

For each patient, we compared these descriptions with the final results regarding categories of contributing causes. If the calculated major causes were not sufficiently covered by the descriptions of at least 2 of 3 reviewers, the cause of dizziness was considered to be unclear.

Statistical Analysis

Descriptive statistics were calculated to characterize the study population and to describe the distribution of subtypes and causes of dizziness. Interrater agreement for classifying the subtype of dizziness was determined by calculating Cohen’s κ for more than 2 annotators with multiple classes.44 Interrater agreement for the estimated contribution (0% to 100%) of causes of dizziness was determined by calculating the intraclass correlation coefficient (ICC) for consistency, using a 2-way random effects model for single measurements.45 Values of interrater agreement were interpreted according to Landis and Koch.46

To assess the robustness of the threshold for contributing causes of dizziness (set at 10%), we performed a sensitivity analysis, with alternative thresholds set at 7.5%, 15%, 20%, and 25%.

RESULTS

Patient Characteristics

During the 19-month study period 417 patients completed the diagnostic evaluation. In 10 patients the dizziness had already resolved. Four patients did not fulfill the inclusion criteria, 2 patients were physically unable to participate, and 15 patients refused or did not keep their appointments (Figure 1⇓).

Figure 1.
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Figure 1.

Flowchart of participants through the study.

Patient characteristics are displayed in Table 1⇓, and dizziness characteristics are displayed in Table 2⇓. The mean impact of dizziness on everyday life, as measured by the Dizziness Handicap Inventory on a scale from 0 to 100, with 0 indicating the least impact, was 36.3 (SD ± 19.9).

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Table 1.

Patient Characteristics of 417 Dizzy Elderly Patients in Primary Care

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Table 2.

Dizziness Characteristics of 417 Dizzy Elderly Patients in Primary Care

Table 3⇓ shows the frequency of abnormal findings during physical examination and additional diagnostic tests. Frequent abnormal test results (40% to 50% of the patients) included an abnormal Semmes-Weinstein monofilament test, high systolic blood pressure, abnormal audiometry for both ears, limited stability at rest and during walking, and at least 1 psychiatric disorder according to the PRIME-MD PHQ.

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Table 3.

Abnormal Findings During the Examination of 417 Dizzy Elderly Patients in Primary Care

Subtypes and Causes of Dizziness

According to the panel, presyncope was the most common dizziness subtype (69%), after which came vertigo (41%), disequilibrium (40%), and other dizziness (2%). Forty-four percent of the patients were assigned 2 or 3 dizziness subtypes. The panel members did not agree on the dizziness subtype(s) of 16 patients (Table 4⇓).

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Table 4.

Subtypes of Dizziness in 417 Dizzy Elderly in Primary Care (Panel Diagnosis)

According to the panel, cardiovascular disease was the most common major contributory cause of dizziness (57%), then peripheral vestibular disease (14%), and psychiatric illness (10%). An adverse drug effect was considered to be the most common minor contributory cause of dizziness (23%). Sixty-two percent of the patients were assigned 2 or more contributory causes. The panel members did not agree on the cause of dizziness in 34 patients (Table 5⇓).

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Table 5.

Causes of Dizziness in 417 Elderly Patients in Primary Care (Panel Diagnosis)

When performing the sensitivity analysis, raising the threshold gradually increased the relative contribution of cardiovascular disease, while it decreased the relative contribution of an adverse drug effect. Raising the threshold did not affect the relative contribution of other causes of dizziness. Lowering the threshold did not affect the relative contribution of any of the 9 possible causes of dizziness.

Interrater Agreement

Interrater agreement for the assignment of dizziness subtypes was highest for the subtype vertigo (κ = 0.4, moderate agreement), then presyncope and disequilibrium (κ = 0.3, fair agreement), and other dizziness (κ = 0.1, slight agreement).46 Interrater agreement for assessment of contributing causes of dizziness was best for metabolic or endocrine conditions, psychiatric illness, and peripheral vestibular disease (ICC = 0.4), followed by cardiovascular disease and locomotor disease (ICC = 0.3), adverse drug effect and impaired vision (ICC = 0.2), and neurological disease (ICC = 0.1).

Panel members tended to have a preference for diagnostic categories, such as cardiovascular disease (nursing home doctor, 63%, family physician, 35%, and geriatrician, 44%), adverse drug effect (geriatrician, 16%, family physician, 12%, and nursing home doctor, 5%), and psychiatric illness (family physician, 14%, geriatrician, 9%, and nursing home doctor, 8%).

DISCUSSION

According to the panel, presyncope was the most common dizziness subtype in dizzy elderly patients in primary care. Forty-four percent of the patients were assigned more than 1 dizziness subtype. Cardiovascular disease was considered to be the most common major contributory cause of dizziness (57%), with peripheral vestibular disease (14%) and psychiatric illness (10%) coming next. An adverse drug effect was considered to be the most common minor contributory cause of dizziness (23%). Sixty-two percent of the dizzy patients were assigned more than 1 contributory cause of dizziness.

Comparison With Existing Literature

Although dizzy patients are predominantly seen in family practice,10,11 only few diagnostic studies on dizziness have been performed among patients seen in a family practice setting.7,47,48 Most studies have been performed among patients not representative of family practice5,8,12–19 or less representative of family practice, such as those by Colledge et al (community-based population)49 or Kroenke et al (mixed hospital population).9

Previous studies often reported vertigo as the most common subtype of dizziness, varying from 40% to 55% of the studied population. These studies, however, included a younger9,47 or referred population.5,15 In our study 44% of the patients were assigned more than 1 dizziness subtype, which is consistent with the results of other studies on dizziness in elderly people.2,49

Cardiovascular disease was considered to be the most common cause of dizziness in elderly patients, which is consistent with previous reports of Colledge et al,49 and Lawson et al.7 Kroenke and coworkers reported vestibular disease to be the most common cause of dizziness,9 perhaps the result of a different setting (hospital vs family practice in our study) and a different age of the study population (mean, 62 years vs 79 years in our study). Several other studies also reported vestibular disease to be the most common cause of dizziness. Again, this finding may be due to differences in setting or patient selection, resulting in a younger population,47,48 a vertiginous population,47 a population seen in emergency departments,8,12,13 or a referred population.5,14–19

The use of drugs in our study population was high; 33% of the dizzy patients used more than 5 drugs, and 37% used 3 or more fall-risk–increasing drugs. According to our panel, an adverse drug effect was considered to be a (major or minor) contributory cause in 25% of the dizzy patients. This rate was much higher than reported in previous studies, varying from 1%–9%.5,8,12,14,48 This difference may be partially explained by the older age of our study population. It is possible, however, that previous investigators may have underestimated the contribution of drugs as a cause of dizziness in elderly patients, because they only registered a small selection of all potentially dizziness causing drugs.5,8,12,14,48

Finally, when comparing previous literature on dizziness, studies vary markedly in the reported prevalence of diagnoses,6,43 and an important phenomenon is revealed: investigators tend to diagnose conditions that they know about or are interested in. Sloane referred to this phenomenon as the blind men and the elephant.50 For example, Colledge et al performed magnetic resonance imaging of the head and neck and reported an unusually high prevalence of cervical spondylosis (66%) as a cause of dizziness.49 In the present study we have tried to reduce the impact of such a phenomenon by using experts from 8 different medical disciplines (cardiology, otolaryngology, family practice, geriatric medicine, internal medicine, neurology, nursing home medicine, and rehabilitation medicine)20 for the selection of diagnostic tests and by using clinicians from 3 different medical disciplines (geriatric medicine, family practice, and nursing home medicine) for independent review of the data.

Strengths and Limitations

A strength of this study is the selection of our population. The population in the our study is highly representative of family practice, which is partly due to the monthly database search for patients whom the family physicians had failed to invite. No other diagnostic study on dizziness used this method to prevent selective inclusion.

Another strength is that, contrary to previous studies, we used an international Delphi procedure for the selection of diagnostic tests.20

A further strength is that we used panel diagnosis to identify contributory causes of dizziness. This research method is well suited if a generally accepted reference standard does not exist and multiple sources of information have to be interpreted in a judicious way to reach a diagnosis. In particular, the panel method is suited for conditions that cannot unequivocally be defined.40 Most previous diagnostic studies on dizziness used a single clinician for determining cause and were therefore more susceptible to investigator bias.

Some limitations of our study should be mentioned. First, the absence of a clinical follow-up as an additional source of information might be regarded as a limitation.40 For that reason, we have initiated a follow-up study among our study population. We emphasize, however, that a follow-up study will not solve the fundamental problem of diagnostic research on dizziness: most diagnoses related to dizziness in family practice lack a reliable reference standard,51 so often it is impossible to confirm a suspected cause of dizziness.

Second, despite our attempt to see more of the “elephant,”50 our study may have diagnostic blind spots, both on the level of test selection (ie, some diagnostic tests may be absent as a result of preferences of the experts participating in the Delphi procedure),20 and on the level of test interpretation (ie, panel members’ preferences might cause some diagnoses may to be understated or overrated).

Third, the relatively low levels of interrater agreement (κ and ICC of 0.1–0.4) suggest discordant disease classification.40 Such a degree of clinical disagreement was to be expected (Kroenke et al found an overall κ of 0.39),9 because dizziness is a symptom that may have a multifactorial origin, especially in the elderly. It is for this reason that we used a panel of 3 clinicians representing different, yet relevant, general medical disciplines and that we combined their assessments according to additional, well-defined decision rules. The relatively low levels of interrater agreement also illustrate that individual clinicians may have diagnostic preferences. Accordingly, as do Kroenke et al,9 we believe that multiple raters should be used in symptom research to counterbalance investigator bias.

Fourth, it may seem advisable to extend the panel to include clinicians from other medical disciplines, such as cardiology, otolaryngology, or neurology. Because the data were drawn from a nonreferred, family practice population, however, we chose to select clinicians from disciplines with a generalistic approach toward dizziness.

Fifth, there appears to be a discrepancy between the results of physical examination/additional diagnostic tests (Table 3⇑), and the final distribution of contributing causes of dizziness (Table 5⇑). For example, contrary to the relatively low frequency of abnormal findings during cardiovascular testing, our panel considered cardiovascular disease to be the most common cause of dizziness. This discrepancy may be because the panel members considered the clinical history to be the key diagnostic tool5,9 and (sometimes) superior to the results of physical examination and additional diagnostic tests.

Sixth, it is possible that the semantic and cultural meanings of the word “dizziness” may differ in Dutch and English, which can affect the results of the study. The data of a recently performed study,52 however, suggest that the symptoms of Dutch dizzy patients match well with the widely used symptom classification of Drachman and Hart.15

Finally, another panel may assess the data differently, especially if such a panel has a different educational, cultural, or other background. We therefore want to use our data in a future case vignette study to assess the generalizability of the diagnoses made by our panel.

Implications for Clinical Practice

Understanding the clinical epidemiology of dizziness in its corresponding population is an essential first step when evaluating dizziness.50 Although vestibular disease is considered to be the most common cause of dizziness in secondary or tertiary care, the results of our study suggest that cardiovascular disease is the most common cause of dizziness in elderly patients in primary care.

In daily clinical practice, family physicians should anticipate that many dizzy elderly patients have more than 1 cause of dizziness. A systematic exploration of dizziness may find contributory causes that are amenable to treatment, such as an adverse drug effect that can be resolved by adjusting medication, depression or anxiety that might be amenable to psychotherapy, limited stability during walking that can be improved with physiotherapy/balance training, or impaired vision that can be corrected. An approach that considers multiple causes of dizziness in elderly patients may, if not solve the problem of dizziness, lead to a clinically relevant reduction of impairments that contribute to dizziness.

Acknowledgments

The authors wish to thank Professor Patrick J. Bindels for his assistance with the design of the study, and Patria M. Diaz Nerio, Sophie Hengst, and Astrid Wewerinke for their assistance with the examination of patients.

Footnotes

  • Conflicts of interest: none reported

  • Author contributions: H.vdH. and H.vW. obtained funding for the study. O.R.M., J.D., F.G.S., H.C.vW., D.A.vdW., G.tR., and H.E.vdH. were involved in the design of the study. O.R.M. performed the statistical analysis and wrote the original draft. All authors critically revised the draft for intellectual content and approved the final version.

  • Funding support: This study was supported by the Netherlands Organisation for Health Research and Development (ZonMW, No. 4200.0018), The Hague. The sponsor did not participate in the study design, data collection, analysis, interpretation, or the preparation or submission of this report.

  • Received for publication August 10, 2009.
  • Revision received November 24, 2009.
  • Accepted for publication December 3, 2009.
  • © 2010 Annals of Family Medicine, Inc.

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The Annals of Family Medicine: 8 (3)
The Annals of Family Medicine: 8 (3)
Vol. 8, Issue 3
1 May 2010
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Causes of Persistent Dizziness in Elderly Patients in Primary Care
Otto R. Maarsingh, Jacquelien Dros, François G. Schellevis, Henk C. van Weert, Danielle A. van der Windt, Gerben ter Riet, Henriette E. van der Horst
The Annals of Family Medicine May 2010, 8 (3) 196-205; DOI: 10.1370/afm.1116

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Causes of Persistent Dizziness in Elderly Patients in Primary Care
Otto R. Maarsingh, Jacquelien Dros, François G. Schellevis, Henk C. van Weert, Danielle A. van der Windt, Gerben ter Riet, Henriette E. van der Horst
The Annals of Family Medicine May 2010, 8 (3) 196-205; DOI: 10.1370/afm.1116
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  • Prognosis and Survival of Older Patients With Dizziness in Primary Care: A 10-Year Prospective Cohort Study
  • Working-age adults perspectives on living with persistent postural-perceptual dizziness: a qualitative exploratory study
  • Predicting an Unfavorable Course of Dizziness in Older Patients
  • Guided and unguided internet-based vestibular rehabilitation versus usual care for dizzy adults of 50 years and older: a protocol for a three-armed randomised trial
  • Authors reply to Seemungal and Bolland and colleagues
  • Effects of Nonpharmacological Interventions for Dizziness in Older People: Systematic Review
  • Looks vestibular: irrational prescribing of antivertiginous drugs for older dizzy patients in general practice
  • In This Issue: The Nourishment and Support of Family Medicine
  • Annals Journal Club: Causes of Dizziness in the Elderly
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