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Biomedical subjects

D C Green

Publications and source records attributed to D C Green.

At least 19 recordsLinked to original sources

Physician incentives and disclosure of payment methods to patients.

OBJECTIVE: There is increasing public discussion of the value of disclosing how physicians are paid. However, little is known about patients' awareness of and interest in physician payment information or its potential impact on patients' evaluation of their care. DESIGN: Cross-sectional survey SETTING: Managed care and indemnity plans of a large, national health insurer. PARTICIPANTS: Telephone interviews were conducted with 2,086 adult patients in Atlanta, Ga; Baltimore, Md/Washington DC; and Orlando, Fla (response rate, 54%). MEASUREMENTS AND MAIN RESULTS: Patients were interviewed to assess perceptions of their physicians' payment method, preference for disclosure, and perceived effect of different financial incentives on quality of care. Non-managed fee-for-service patients (44%) were more likely to correctly identify how their physicians were paid than those with salaried (32%) or capitated (16%) physicians. Just over half (54%) wanted to be informed about their physicians' payment METHOD: Patients of capitated and salaried physicians were as likely to want disclosure as patients of fee-for-service physicians. College graduates were more likely to prefer disclosure than other patients. Many patients (76%) thought a bonus paid for ordering fewer than the average number of tests would adversely affect the quality of their care. About half of the patients (53%) thought a particular type of withhold would adversely affect the quality of their care. White patients, college graduates, and those who had higher incomes were more likely to think that these types of bonuses and withholds would have a negative impact on their care. Among patients who believed that these types of bonuses adversely affected care, those with non-managed fee-for-service insurance and college graduates were more willing to pay a higher deductible or co-payment in order to get tests that they thought were necessary. CONCLUSIONS: Most patients were unaware of how their physicians are paid, and only about half wanted to know. Most believed that bonuses or withholds designed to reduce the use of services would adversely affect the quality of their care. Lack of knowledge combined with strong attitudes about various financial incentives suggest that improved patient education could clarify patient understanding of the nature and rationale for different types of incentives. More public discussion of this important topic is warranted.

Adult↗

Health literacy among Medicare enrollees in a managed care organization.

CONTEXT: Elderly patients may have limited ability to read and comprehend medical information pertinent to their health. OBJECTIVE: To determine the prevalence of low functional health literacy among community-dwelling Medicare enrollees in a national managed care organization. DESIGN: Cross-sectional survey. SETTING: Four Prudential HealthCare plans (Cleveland, Ohio; Houston, Tex; south Florida; Tampa, Fla). PARTICIPANTS: A total of 3260 new Medicare enrollees aged 65 years or older were interviewed in person between June and December 1997 (853 in Cleveland, 498 in Houston, 975 in south Florida, 934 in Tampa); 2956 spoke English and 304 spoke Spanish as their native language. MAIN OUTCOME MEASURE; Functional health literacy as measured by the Short Test of Functional Health Literacy in Adults. RESULTS: Overall, 33.9% of English-speaking and 53.9% of Spanish-speaking respondents had inadequate or marginal health literacy. The prevalence of inadequate or marginal functional health literacy among English speakers ranged from 26.8% to 44.0%. In multivariate analysis, study location, race/language, age, years of school completed, occupation, and cognitive impairment were significantly associated with inadequate or marginal literacy. Reading ability declined dramatically with age, even after adjusting for years of school completed and cognitive impairment. The adjusted odds ratio for having inadequate or marginal health literacy was 8.62 (95% confidence interval, 5.55-13.38) for enrollees aged 85 years or older compared with individuals aged 65 to 69 years. CONCLUSIONS: Elderly managed care enrollees may not have the literacy skills necessary to function adequately in the health care environment. Low health literacy may impair elderly patients' understanding of health messages and limit their ability to care for their medical problems.

Aged↗

Prenatal care in the first trimester: misleading findings from HEDIS. Health Plan Employer Data and Information Set.

OBJECTIVE: To understand factors influencing Health Plan Employer Data and Information Set (HEDIS) rates for the measure 'Prenatal care in the first trimester'. DESIGN: Telephone survey of a retrospective cohort of women with a live birth. Medical record review of a sample of both responders and non-responders to the telephone survey. Detailed review of HEDIS data collection procedures. SETTING: A managed care plan in California. STUDY PARTICIPANTS: Women aged 18-49 years at date of delivery, who delivered a live birth from 1 October 1995 through 31 March 1996, and who were continuously enrolled in a California managed care plan for 12 months prior to delivery (telephone survey, n= 1,185; medical record review, n= 465). RESULTS: Of the women participating in the telephone survey, 95% indicated that their first prenatal visit occurred during the first 3 months of pregnancy. Using HEDIS 3.0 standards, a review of medical records for a sample of these women indicated that 94% of the women initiated care during the first trimester. These results contrasted sharply with 1995 and 1996 HEDIS rates of 64% and 75%, respectively. CONCLUSION: An investigation of the discrepancy between HEDIS rates and rates from both telephone survey and medical record review led to the finding that the low HEDIS rates were due not to a true low rate of early care, but to data collection problems, including difficulty obtaining medical records. Potential solutions involving health plan activities, revisions to the official HEDIS process and revised reporting of results are proposed.

Adolescent↗

The relationship between method of physician payment and patient trust.

CONTEXT: Trust is the cornerstone of the patient-physician relationship. Payment methods that place physicians at financial risk have raised concerns about patients' trust in physicians to act in patients' best interests. OBJECTIVE: To evaluate the extent to which methods of physician payment are related to patient trust. DESIGN: Cross-sectional telephone interview survey done between January and June 1997. SETTING: Health plans of a large national insurer in Atlanta, Ga, the Baltimore, Md-Washington, DC, area, and Orlando, Fla. PARTICIPANTS: A total of 2086 adult managed care and indemnity patients. MAIN OUTCOME MEASURE: A 10-item scale (alpha = .94) assessing patients' trust in physicians. RESULTS: More fee-for-service (FFS) indemnity patients (94%) completely or mostly trust their physicians to "put their health and well-being above keeping down the health plan's costs" than salary (77%), capitated (83%), or FFS managed care patients (85%) (P<.001 for pairwise comparisons). In multivariate analyses that adjusted for potentially confounding factors, FFS indemnity patients also had higher scores on the 10-item trust scale than salary (P<.001), capitated (P<.001), or FFS managed care patients (P<.01). The effects of payment method on patient trust were reduced when a measure based on patients' reports about physician behavior (eg, Does your physician take enough time to answer your questions?) was included in the regression analyses, but the differences remained statistically significant, except for the comparison between FFS managed care and FFS indemnity patients (P=.08). Patients' perceptions of how their physicians were paid were not independently associated with trust, but the 37.7% who said they did not know how their physicians were paid had higher levels of trust than other patients (P<.01). A total of 30.2% of patients were incorrect about their physicians' method of payment. CONCLUSIONS: Most patients trusted their physicians, but FFS indemnity patients have higher levels of trust than salary, capitated, or FFS managed care patients. Patients' reports of physician behavior accounted for part of the variation in patients' trust in physicians who are paid differently. The impact of payment methods on patient trust may be mediated partly by physician behavior.

Attitude to Health↗

Are we underestimating rates of vaginal birth after previous cesarean birth? The validity of delivery methods from birth certificates.

Previous studies of birth certificates have not fully evaluated how accurately they identify delivery methods that have a historical component, such as repeat cesarean and vaginal birth after previous cesarean (VBAC). The authors used linked Georgia birth certificates for first and second deliveries to examine the accuracy of four reported delivery methods in the second pregnancy: vaginal (without previous cesarean), VBAC, primary cesarean, and repeat cesarean, as well as an indicator of a previous cesarean. From the immediate birth certificates, the delivery method for each of the two births was classified as vaginal (V) or cesarean section (CS), which produced possible sequences of V-V, CS-V, V-CS, and CS-CS. The delivery method for the second births to 106,049 women from 1989 through 1992 was reviewed, taking into account the historical information from the linked certificates regarding the first births. Only 42.0% of women with a CS-V sequence were correctly designated on the second birth certificate as a VBAC; 79.3% of women with a V- CS sequence were correctly designated as primary cesarean. From 1980 through 1988, birth certificates contained a check box indicating a previous cesarean (but no VBAC box). During this period, only 75.5% of 25,491 women with a previous cesarean were so designated on the birth certificate. These findings suggest that cross-sectional vital records data substantially underestimate VBAC and primary cesarean rates.

Birth Certificates↗

Patients' trust in their physicians: effects of choice, continuity, and payment method.

OBJECTIVE: To evaluate the extent to which physician choice, length of patient-physician relationship, and perceived physician payment method predict patients' trust in their physician. DESIGN: Survey of patients of physicians in Atlanta, Georgia. PATIENTS: Subjects were 292 patients aged 18 years and older. MEASUREMENTS AND MAIN RESULTS: Scale of patients' trust in their physician was the main outcome measure. Most patients completely trusted their physicians "to put their needs above all other considerations" (69%). Patients who reported having enough choice of physician (p < .05), a longer relationship with the physician (p < .001), and who trusted their managed care organization (p < .001) were more likely to trust their physician. Approximately two thirds of all respondents did not know the method by which their physician was paid. The majority of patients believed paying a physician each time a test is done rather than a fixed monthly amount would not affect their care (72.4%). However, 40.5% of all respondents believed paying a physician more for ordering fewer than the average number of tests would make their care worse. Of these patients, 53.3% would accept higher copayments to obtain necessary medical tests. CONCLUSIONS: Patients' trust in their physician is related to having a choice of physicians, having a longer relationship with their physician, and trusting their managed care organization. Most patients are unaware of their physician's payment method, but many are concerned about payment methods that might discourage medical use.

Adolescent↗

The effect of gas density on glottal vibration and exit jet particle velocity.

Although theoretical studies include a term for gas density in their mathematical descriptions of glottal aerodynamics, the effect of gas density on glottal vibration has not been examined empirically. In this study, an in vivo canine model was used to evaluate the effect of gas density on glottal vibration by comparing phonation with air and helium. With gas flow and nerve stimulation held constant, phonation with helium resulted in an increased exit jet particle velocity for helium (45 m/s) compared to air (34 m/s). However, the measured increase in helium velocity was less than predicted by a proportional relationship between transglottal pressure and dynamic pressure. This difference could be due to a change in the constant of proportionality or in the dynamic pressure loss coefficient associated with the use of helium.

Animals↗

Changes in glottal area associated with increasing airflow.

Laryngeal resistance varies inversely with airflow during phonation. This study evaluated the morphological changes in the glottis that accompany decreases in laryngeal resistance at higher levels of airflow. An in vivo canine model of phonation and a video analysis system were used to assess changes in area. Four animals were examined stroboscopically as airflow increased, with constant recurrent laryngeal nerve stimulation. Glottal dynamics were evaluated by means of photoglottography, electroglottography, and measures of subglottic pressure. Analysis of digitized stroboscopic images indicated that increasing airflow had no obvious effect on the glottal chink (vocal process contact). Increasing airflow was associated with an increase in the area of peak opening and an increase in the glottal area integral.

Analysis of Variance↗

Effect of tension, stiffness, and airflow on laryngeal resistance in the in vivo canine model.

This study used an in vivo canine model of phonation to determine the effects of airflow on glottal resistance at low, medium, and high levels of recurrent laryngeal nerve (RLN) and superior laryngeal nerve (SLN) stimulation. Static and dynamic trials of changing airflow were used to study the effects of airflow on glottal resistance during phonation. As reported previously, glottal resistance varies inversely as a function of airflow. Increasing levels of RLN stimulation resulted in a statistically significant increase in glottal resistance for each level of airflow evaluated. Variation in SLN stimulation had no statistically effects on the relationship between flow and resistance. At airflow rates greater than 590 milliliters per second (mL/s), glottal resistance approached 0.1 mm Hg per mL/s for all levels of RLN and SLN stimulation tested. These data support the collapsible tube model of phonation.

Airway Resistance↗

Point-touch technique of botulinum toxin injection for the treatment of spasmodic dysphonia.

Intralaryngeal injections of botulinum toxin (Botox), under electromyographic guidance, have emerged as an effective treatment for adductor spasmodic dysphonia. To remain effective, these injections must be repeated every 3 to 9 months as the symptoms recur. One drawback to the current method is the need for electromyographic confirmation of needle placement into the thyroarytenoid muscle. This report describes an anatomic approach to Botox injection that requires only flexible nasopharyngeal endoscopy and careful evaluation of the anatomic landmarks. This technique has been used successfully on 13 patients, and objective pretreatment and posttreatment measures are reported.

Adult↗

Physiologic motion after vocal cord reinnervation: a preliminary study.

This study attempted to reestablish physiologic vocal cord motion, rather than synkinesis, to a reinnervated vocal cord. One mongrel dog underwent a division and reanastomosis of the anterior branch of the right recurrent laryngeal nerve and simultaneous separation and reimplantation of a posterior division nerve-muscle pedicle into the posterior cricoarytenoid muscle. After 21 weeks, spontaneous physiologic vocal cord movement and electromyographic (EMG) activity were recorded during respiratory obstruction and laryngeal mechanical stimulation. Acoustic measures and histologic data are also presented from the reinnervated and normal vocalis muscle and from the recurrent laryngeal nerve. This study demonstrated that physiologic vocal cord motion can be achieved after laryngeal reinnervation using this technique.

Anastomosis, Surgical↗

Experimental evidence in the in vivo canine for the collapsible tube model of phonation.

The in vivo canine model of the larynx was used to measure transglottic pressures and airflow during phonation. Conditions of supraglottal resistance were also simulated. Pressure drop-flow curves were compared with data on collapsible tubes. The in vivo in canine model of the larynx demonstrates a number of features similar to oscillation in collapsible tubes.

Air Movements↗

Vocal fold medialization by surgical augmentation versus arytenoid adduction in the in vivo canine model.

There are a variety of methods for treating unilateral vocal cord paralysis, but to date there have been few studies that compare these phonosurgical techniques by using objective measures of voice improvement. Vocal efficiency is an objective voice measure that is defined as the ratio of the acoustic power produced by the larynx to the subglottic air power. Vocal efficiency has been found to decrease with glottic disorders such as vocal cord paralysis and carcinoma. This study compared the effects of vocal fold medialization by surgical augmentation to those of arytenoid adduction on the vocal efficiency, videostroboscopy, and acoustics (jitter, shimmer, and signal-to-noise ratio) of a simulated unilateral vocal cord paralysis in an in vivo canine model. Arytenoid adduction was superior to surgical augmentation in vocal efficiency, traveling wave motion, and acoustics.

Animals↗

A functional evaluation of ansa cervicalis nerve transfer for unilateral vocal cord paralysis: future directions for laryngeal reinnervation.

There are a variety of methods for treating unilateral vocal cord paralysis, but to date there are few objective studies that evaluate the functional results of nerve transfer from the ansa cervicalis. Six dogs underwent unilateral recurrent laryngeal nerve section with immediate reanastamosis to the sternothyroid branch of the ansa cervicalis. After 5 to 6 months, measurements of vocal efficiency and acoustic parameters, videolaryngoscopy, videostroboscopy, and evoked electromyography were performed. Identical measurements were made in eight control dogs during normal electrically induced phonation and a simulated unilateral recurrent laryngeal nerve paralysis. Histologic analysis of both vocalis muscles, recurrent laryngeal nerves, ansa cervicalis, and the ansa-recurrent laryngeal nerve anastamosis site was performed. Evidence of reinnervation was found in all of the animals that underwent nerve transfer. The vocal efficiency and acoustic quality after ansa cervicalis nerve transfer were dependent on the degree of electrical stimulation from the transferred nerve to the reinnervated cord during phonation. In the absence of electrical stimulation to the nerve transfer, physiologic vocal cord motion could not be elicited from the reinnervated cord.

Anastomosis, Surgical↗

An in vivo canine model for testing treatment effects in laryngeal hyperadduction disorders.

Adductor spastic dysphonia is a voice disorder characterized by a strained, squeezed, effortful voice produced by true and false cord hyperadduction. An in vivo canine model has been developed to simulate hyperadduction of the true cords. Using this model, the thyroarytenoid muscle was found to have a greater effect on intraglottic and subglottic pressure than cricothyroid muscle contraction. The intraglottic and subglottic pressure was reduced after simulated recurrent laryngeal paralysis. This model can be used in future studies to compare laryngeal treatment modalities for disorders that have a component of vocal cord hyperadduction, such as spastic dysphonia.

Animals↗