Primary care payment models and avoidable hospitalizations in Ontario, Canada: A multivalued treatment effects analysis.

Improving access to primary care physicians' services may help reduce hospitalizations due to Ambulatory Care Sensitive Conditions (ACSCs). Ontario, Canada's most populous province, introduced blended payment models for primary care physicians in the early- to mid-2000s to increase access to primary care, preventive care, and better chronic disease management. We study the impact of payment models on avoidable hospitalizations due to two incentivized ACSCs (diabetes and congestive heart failure) and two non-incentivized ACSCs (angina and asthma). The data for our study came from health administrative data on practicing primary care physicians in Ontario between 2006 and 2015. We employ a two-stage estimation strategy on a balanced panel of 3710 primary care physicians (1158 blended-fee-for-service (FFS), 1388 blended-capitation models, and 1164 interprofessional team-based practices). First, we account for the differences in physician practices using a generalized propensity score based on a multinomial logit regression model, corresponding to three primary care payment models. Second, we use fractional regression models to estimate the average treatment effects on the treated outcome (i.e., avoidable hospitalizations). The capitation-based model sometimes increases avoidable hospitalizations due to angina (by 7 per 100,000 patients) and congestive heart failure (40 per 100,000) relative to the blended-FFS-based model. Switching capitation physicians into interprofessional teams mitigates this effect, reducing avoidable hospitalizations from congestive heart failure by 30 per 100,000 patients and suggesting better access to primary care and chronic disease management in team-based practices.

Stirring the pot: Switching from blended fee-for-service to blended capitation models of physician remuneration.

In Canada's most populous province, Ontario, family physicians may choose between the blended fee-for-service (Family Health Group [FHG]) and blended capitation (Family Health Organization [FHO] payment models). Both models incentivize physicians to provide after-hours (AH) and comprehensive care, but FHO physicians receive a capitation payment per enrolled patient adjusted for age and sex, plus a reduced fee-for-service while FHG physicians are paid by fee-for-service. We develop a theoretical model of physician labor supply with multitasking to predict their behavior under FHG and FHO, and estimable equations are derived to test the predictions empirically. Using health administrative data from 2006 to 2014 and a two-stage estimation strategy, we study the impact of switching from FHG to FHO on the production of a capitated basket of services, after-hours services and nonincentivized services. Our results reveal that switching from the FHG to FHO reduces the production of capitated services to enrolled patients and services to nonenrolled patients by 15% and 5% per annum and increases the production of after-hours and nonincentivized services by 8% and 15% per annum.

Production of physician services under fee-for-service and blended fee-for-service: Evidence from Ontario, Canada.

We examine family physicians' responses to financial incentives for medical services in Ontario, Canada. We use administrative data covering 2003-2008, a period during which family physicians could choose between the traditional fee for service (FFS) and blended FFS known as the Family Health Group (FHG) model. Under FHG, FFS physicians are incentivized to provide comprehensive care and after-hours services. A two-stage estimation strategy teases out the impact of switching from FFS to FHG on service production. We account for the selection into FHG using a propensity score matching model, and then we use panel-data regression models to account for observed and unobserved heterogeneity. Our results reveal that switching from FFS to FHG increases comprehensive care, after-hours, and nonincentivized services by 3%, 15%, and 4% per annum. We also find that blended FFS physicians provide more services by working additional total days as well as the number of days during holidays and weekends. Our results are robust to a variety of specifications and alternative matching methods. We conclude that switching from FFS to blended FFS improves patients' access to after-hours care, but the incentive to nudge service production at the intensive margin is somewhat limited.

Family physician remuneration schemes and specialist referrals: Quasi-experimental evidence from Ontario, Canada.

Understanding how family physicians respond to incentives from remuneration schemes is a central theme in the literature. One understudied aspect is referrals to specialists. Although the theoretical literature has suggested that capitation increases referrals to specialists, the empirical evidence is mixed. We push forward the empirical research on this question by studying family physicians who switched from blended fee-for-service to blended capitation in Ontario, Canada. Using several health administrative databases from 2005 to 2013, we rely on inverse probability weighting with fixed-effects regression models to account for observed and unobserved differences between the switchers and nonswitchers. Switching from blended fee-for-service to blended capitation increases referrals to specialists by about 5% to 7% per annum. The cost of specialist referrals is about 7 to 9% higher in the blended capitation model relative to the blended fee-for-service. These results are generally robust to a variety of alternative model specifications and matching techniques, suggesting that they are driven partly by the incentive effect of remuneration. Policy makers need to consider the benefits of capitation payment scheme against the unintended consequences of higher referrals to specialists.

A Case of Malignant Melanotic Schwannoma of the Trigeminal Nerve: A Case Report and Review of Literature.

Intracranial melanotic schwannoma is quite rare, and involvement of the trigeminal nerve is even rarer. Early diagnosis and surgical excision are the mainstays of management. These tumors have a high tendency to recur and there is high possibility of metastasis. Adjuvant radiotherapy should be considered since the prognosis is uncertain. A 23-year-old man started developing numbness over the left side of the forehead 9 months ago that progressed to involve the ipsilateral cheek. The patient started having diplopia on looking to the left side 8 months ago. His relatives noticed a change in his voice 1 month ago and he developed weakness in the right upper and lower limbs, which was gradually progressive. The patient had slight difficulty swallowing. After examination, we found involvement of multiple cranial nerves with pyramidal signs. Magnetic resonance imaging (MRI) was suggestive of an extra-axial lesion in the left cerebellopontine angle extending into the middle cranial fossa, which was having high T1 and T2 signal loss with contrast enhancement. We achieved near-total excision of the tumor via a subtemporal extradural approach. Trigeminal melanotic schwannoma is a rare occurrence constituting melanin-producing cells and Schwann cells. Rapid progression of symptoms and signs should prompt the suspicion of the possible malignant nature of the pathology. Extradural skull base approaches reduce the risk of postoperative deficits. Differentiating melanotic schwannoma from malignant melanoma is of utmost importance in planning of management.

Meningiomas in children and adolescents: a meta-analysis of individual patient data.

BACKGROUND: The epidemiological, prognostic, and therapeutic features of child and adolescent meningioma are poorly defined. Clinical knowledge has been drawn from small case series and extrapolation from adult studies. This study was done to pool and analyse the clinical evidence on child and adolescent meningioma. METHODS: Searches of PubMed, Medline, and Embase identified 35 case series of child and adolescent meningioma completed over the past 21 years. Individual patient data were obtained from 30 studies via direct communication with investigators. Primary outcomes were relapse-free survival (RFS) and overall survival. Prognostic variables were extent of initial surgery, use of upfront radiotherapy, age, sex, presence of neurofibromatosis, tumour location, and tumour grade. RFS and overall survival were analysed using Kaplan-Meier survival curves and multivariable Cox regression models. FINDINGS: From a total of 677 children and adolescents with meningioma, 518 were eligible for RFS analysis and 547 for overall survival analysis. Multivariable analysis showed that patients who underwent initial gross-total resection had better RFS (hazard ratio 0·16, 95% CI 0·10-0·25; p<0·0001) and overall survival (0·21, 0·11-0·39; p<0·0001) than those who had subtotal resection. No significant benefit was seen for upfront radiotherapy in terms of RFS (0·59, 0·30-1·16; p=0·128) or overall survival (1·10, 0·53-2·28; p=0·791). Patients with neurofibromatosis type 2 (NF2) had worse RFS than those without neurofibromatosis (2·36, 1·23-4·51; p=0·010). There was a significant change in overall survival with time between patients with NF2 compared with those without neurofibromatosis (1·45, 1·09-1·92; p=0·011); although overall survival was initially better for patients with NF2 than for those without neurofibromatosis, overall survival at 10 years was worse for patients with NF2. Patients with WHO grade III tumours had worse RFS than those with WHO grade I (3·90, 2·10-7·26; p<0·0001) and grade II tumours (2·49, 1·11-5·56; p=0·027). INTERPRETATION: Extent of initial surgical resection is the strongest independent prognostic factor for child and adolescent meningioma. No benefit for upfront radiotherapy was noted. Hence, aggressive surgical management, to achieve gross-total resection, is the initial treatment of choice. In the event of a subtotal resection, repeat resection is recommended to achieve maximum extirpation. Close observation is warranted for patients who have a subtotal resection or who have WHO grade III tumours. Patients without neurofibromatosis should have a minimum 10-year follow-up, whereas patients with NF2 should be considered a special risk category, necessitating life-long follow-up. FUNDING: None.

Recurrent Papillary Tumor of Pineal Region Misdiagnosed as Pineocytoma 9-Years Ago.

Primary tumors of the pineal gland occur infrequently with a preponderance of either parenchymal tumors or germ cells tumors. Papillary tumor of the pineal region is a rare neuroepithelial lesion that arises exclusively in the pineal region. They have been designated as either Grade II or Grade III lesions as per the 2016 WHO classification of central nervous system tumors. Clinically, they usually present with obstructive hydrocephalus and visual disturbance. On imaging, these tumors are solid-cystic, heterogeneously enhancing, and show T2 hyperintensity. Pathologically, they can closely resemble a Grade I pineocytoma and immunohistochemistry is essential to differentiate the two. No definite guidelines exist to confirm the ideal protocol of treatment. Evidence regarding the role of radiation after surgery is limited to case reports and series. Adjuvant therapy is usually recommended for tumors with subtotal excision, high proliferative/mitotic index, or proven metastasis. We describe a case of a 29-year-old male with a recurrent papillary tumor of the pineal region, 9 years after primary surgery where it was misdiagnosed as a pineocytoma. The tumor was effectively controlled with surgical excision, cerebrospinal fluid diversion, and adjuvant radiation for 8 years before showing two recurrences within a span of 6 months with a rising proliferation index.

Use of endoscopic third ventriculostomy in hydrocephalus of tubercular origin.

PURPOSE: The purpose of this paper was to study the feasibility of endoscopic third ventriculostomy (ETV) as a treatment modality in patients with hydrocephalus of tubercular origin. MATERIALS AND METHODS: Literature on ETV in hydrocephalus of tubercular origin has been reviewed, and we have gathered experiences of neurosurgeons from various institutions in our country practicing ETV. RESULTS: Hydrocephalus, a common complication of tubercular meningitis, may be of communicating type or of obstructive variety. The communicating type is treated by medical therapy in 70-92% cases, whereas the obstructive type requires surgical intervention. The outcome of surgery depends upon gradation of disease. Shunting however has been a nightmare for neurosurgeons treating such patients (Smyth et al., Pediatr Neurosurg 39: 258-263, 2003). The shunts tend to get blocked with debris. Having found ETV as a successful modality of treatment in obstructive hydrocephalus of other etiology, neurosurgeons have attempted it in hydrocephalus of tubercular origin. Though various authors have had a success rate of 65-68%, failure has been quite high in acute cases due to thickening of the floor of third ventricle and distorted anatomy. The success rate is higher in chronic and burnt out cases. CONCLUSION: Tubercular meningitic hydrocephalus is difficult to treat endoscopically as compared with other forms of meningitic hydrocephalus and requires adequate expertise and experience, especially in acute cases. Therefore, one would be justified in avoiding the use of ETV in acute cases and wait till patient presents with a failed shunt. Use of ETV in subacute and chronic cases seems to be justified as the first line of treatment.

Mortality and Hospitalizations in Intensive Dialysis: A Systematic Review and Meta-Analysis.

BACKGROUND: Survival and hospitalization are critically important outcomes considered when choosing between intensive hemodialysis (HD), conventional HD, and peritoneal dialysis (PD). However, the comparative effectiveness of these modalities is unclear. OBJECTIVE: We had the following aims: (1) to compare the association of mortality and hospitalization in patients undergoing intensive HD, compared with conventional HD or PD and (2) to appraise the methodological quality of the supporting evidence. DATA SOURCES: MEDLINE, Embase, ISI Web of Science, CENTRAL, and nephrology conference abstracts. STUDY ELIGIBILITY PARTICIPANTS AND INTERVENTIONS: We included cohort studies with comparator arm, and randomized controlled trials (RCTs) with >50% of adult patients (≥18 years) comparing any form of intensive HD (>4 sessions/wk or >5.5 h/session) with any form of chronic dialysis (PD, HD ≤4 sessions/wk or ≤5.5 h/session), that reported at least 1 predefined outcome (mortality or hospitalization). METHODS: We used the GRADE approach to systematic reviews and quality appraisal. Two reviewers screened citations and full-text articles, and extracted study-level data independently, with discrepancies resolved by consensus. We pooled effect estimates of randomized and observational studies separately using generic inverse variance with random effects models, and used fixed-effects models when only 2 studies were available for pooling. Predefined subgroups for the intensive HD cohorts were classified by nocturnal versus short daily HD and home versus in-center HD. RESULTS: Twenty-three studies with a total of 70 506 patients were included. Of the observational studies, compared with PD, intensive HD had a significantly lower mortality risk (hazard ratio [HR]: 0.67; 95% confidence interval [CI]: 0.53-0.84; I2 = 91%). Compared with conventional HD, home nocturnal (HR: 0.46; 95% CI: 0.38-0.55; I2 = 0%), in-center nocturnal (HR: 0.73; 95% CI: 0.60-0.90; I2 = 57%) and home short daily (HR: 0.54; 95% CI: 0.31-0.95; I2 = 82%) intensive regimens had lower mortality. Of the 2 RCTs assessing mortality, in-center short daily HD had lower mortality (HR: 0.54; 95% CI: 0.31-0.93), while home nocturnal HD had higher mortality (HR: 3.88; 95% CI: 1.27-11.79) in long-term observational follow-up. Hospitalization days per patient-year (mean difference: -1.98; 95% CI: -2.37 to -1.59; I2 = 6%) were lower in nocturnal compared with conventional HD. Quality of evidence was similarly low or very low in RCTs (due to imprecision) and observational studies (due to residual confounding and selection bias). LIMITATIONS: The overall quality of evidence was low or very low for critical outcomes. Outcomes such as quality of life, transplantation, and vascular access outcomes were not included in our review. CONCLUSIONS: Intensive HD regimens may be associated with reduced mortality and hospitalization compared with conventional HD or PD. As the quality of supporting evidence is low, patients who place a high value on survival must be adequately advised and counseled of risks and benefits when choosing intensive dialysis. Practice guidelines that promote shared decision-making are likely to be helpful.

CONTEXTE: Au moment de choisir une modalité de dialyse pour le traitement des patients souffrant d'insuffisance rénale, le taux de survie et la durée des hospitalisations sont des critères décisionnels d'une importance cruciale. Pourtant, l'efficacité différentielle de l'hémodialyse (HD) intensive, de l'HD conventionnelle et de la dialyse péritonéale (DP) demeure à ce jour mal connue. OBJECTIFS DE L'ÉTUDE: Nos objectifs allaient comme suit : 1) comparer le taux de mortalité et la durée des hospitalisations associés à chacune des modalités (HD intensive, HD conventionnelle et DP), et 2) évaluer la qualité méthodologique des données venant appuyer les résultats. SOURCES: Les données proviennent des bases de données en ligne MEDLINE, EMBASE et ISI Web of Science, de même que de CENTRAL et de résumés de conférence en néphrologie. ADMISSIBILITÉ À L'ÉTUDE PARTICIPANTS ET INTERVENTIONS: Ont été incluses à cette méta-analyse les études de cohorte comportant un volet comparatif et les essais contrôlés à répartition aléatoire comptant plus de 50 % de patients adultes et comparant n'importe quelle forme d'HD intensive (plus de 4 séances par semaine ou plus de 5,5 heures par séance) à n'importe quelle forme de dialyse chronique (DP ou HD à raison de 4 séances maximum par semaine ou de 5,5 heures maximum par séance). Les études retenues devaient également rapporter au moins un des deux critères décisionnels prédéfinis (mortalité et hospitalisation). MÉTHODOLOGIE: Nous avons employé l'approche GRADE (Grading of Recommendations Assessment, Development and Evaluation). Cette approche s'applique aux revues systématiques et à l'évaluation de la qualité des données. Deux personnes ont passé en revue des citations et des articles complets pour en extraire les données relatives à l'étude. Les divergences ont été résolues par consensus. Nous avons regroupé les différentes mesures provenant des essais à répartition aléatoire et des études observationnelles pour ensuite les analyser, de façon isolée, à l'aide de la méthode générique de l'inverse de la variance avec modèles à effet aléatoire. Pour les données où seules deux études étaient disponibles pour le regroupement des données, nous avons plutôt employé la méthode générique de l'inverse de la variance avec modèles à effet fixe. Des sous-groupes avaient été prédéfinis dans les cohortes de patients traités par HD intensive, selon le moment (de jour ou de nuit) et le lieu (en centre de dialyse ou à domicile) du traitement. RÉSULTATS: Cette méta-analyse compte 23 études totalisant 70 506 patients. Selon les études observationnelles, lorsque comparée à la DP, l'HD intensive était corrélée à un risque de mortalité significativement plus faible (HR=0,67; IC 95 0,53-0,84; I2=91 %). En comparaison avec l'HD conventionnelle, les schémas de traitement par HD intensive nocturne prodiguée à domicile (HR=0,46; IC 95 : 0,38-0,55; I2=0 %), nocturne en centre (HR=0,73; IC 95 : 0,60-0,90; I2=57 %) et de courte durée, de jour, à domicile (HR=0,54; IC 95 : 0,31-0,95; I2=82%) étaient corrélées à de plus faibles taux de mortalité. Des deux essais contrôlés à répartition aléatoire qui faisaient mention du taux de mortalité, l'HD diurne de courte durée en centre présentait le plus faible taux de mortalité (HR=0,54; IC 95 : 0,31-0,93) alors que l'HD nocturne à domicile présentait le taux de mortalité le plus élevé (HR=3,88; IC 95 : 1,27-11,79) selon les suivis observationnels faits à long terme. Le nombre de jours d'hospitalisation par année-patient (différence moyenne = -1,98 an; IC 95 : -1,59 à 2,37; I2=6 %) était plus faible chez les patients traités par HD intensive nocturne en comparaison avec ceux qui suivaient un traitement par la méthode conventionnelle. Dans tous les cas, la qualité des données recueillies s'est avérée faible ou très faible, qu'il s'agisse d'essais contrôlés à répartition aléatoire (en raison de l'imprécision) ou d'études observationnelles (en raison de facteurs de confusion et de biais de sélection). LIMITES DE L'ÉTUDE: Dans l'ensemble, la qualité des données recueillies pour appuyer les critères décisionnels jugés essentiels s'est avérée faible ou très faible. De plus, des éléments tels que la qualité de vie du patient, la greffe et les enjeux liés à l'accès vasculaire n'ont pas été pris en compte dans notre revue systématique. CONCLUSION: Le traitement de l'insuffisance rénale par HD intensive pourrait être associé à un taux de mortalité réduit et à des séjours à l'hôpital écourtés en comparaison avec les traitements par HD conventionnelle ou par DP. Cependant, en raison de la piètre qualité des données appuyant ces résultats, les patients qui accordent une grande importance à la survie devraient être adéquatement informés et conseillés sur les risques et les bienfaits offerts par l'HD intensive comme modalité de traitement. L'application de lignes directrices concernant la prise de décision conjointe en pratique clinique pourrait être pertinente.

Role of postoperative vasopressor use in occurrence of atrial fibrillation after coronary artery bypass grafting.

Vasopressor use is common after coronary artery bypass grafting surgery. This study evaluated the role of postoperative vasopressor use as a predictor of occurrence of atrial fibrillation after coronary artery bypass grafting and demonstrates that vasopressor use is an independent predictor of such an occurrence.

Internal mammary artery steal syndrome secondary to an anomalous lateral branch.

A 53-year-old male who underwent three-vessel coronary artery bypass grafting had a left internal mammary artery (LIMA) graft to the left anterior descending artery (LAD) and saphenous venous grafts to right coronary artery (RCA) and left circumflex coronary artery. Four years after surgery, he developed exertion angina associated with upper body exercises and even deep breathing at times. Angiographic evaluation revealed an anomalous lateral internal thoracic artery with steal phenomenon documented by adenosine cardiolyte. Patient was successfully treated with transcutaneous steel coil embolization by closing the anomalous vessel. Repeat stress electrocardiogram did not show any signs of ischemia. This case report emphasizes the variability in internal mammary artery (IMA) anatomy and the need to completely ligate all the branches of internal mammary artery intraoperatively.

Role of postoperative use of adrenergic drugs in occurrence of atrial fibrillation after cardiac surgery.

BACKGROUND: Use of adrenergic (inotropic and vasopressor) drugs is common after cardiac surgery. HYPOTHESIS: The study was undertaken to evaluate the role of postoperative adrenergic drug use as a predictor of postoperative atrial fibrillation (AF) after cardiac surgery. METHODS: The study population consisted of 199 patients post cardiac surgery. Postoperative adrenergic drug use and the baseline and clinical variables were analyzed as possible predictors of postoperative AF. RESULTS: Of 199 patients, postoperative AF occurred in 59 patients (incidence 30%). The adrenergic drugs were used in 127 (64%) patients. Postoperative AF occurred in 49 of the 127 patients (39%) with and in 10 of the 72 patients (14%) without adrenergic drug use (p < 0.01). By univariate analyses, postoperative adrenergic drug use, age, left ventricular hypertrophy, left atrial size, valve surgery, aortic valve replacement, cross clamp time, bypass time, postoperative ventricular pacing, and hours in intensive care unit were predictors of development of postoperative AF. Atrial pacing was a predictor of freedom from developing AF. By multivariate logistic regression analysis, adrenergic drug use was an independent predictor of postoperative AF (odds ratio [OR] 3.35, 95% confidence interval [CI] 1.38-8.12, p = 0.016). Two other independent predictors were valve surgery (OR 2.88, 95% CI 1.31-6.35, p = 0.002) and age (OR 10.73, 95% CI 10.37-11.10, p = 0.0001). Adrenergic drug use, valve surgery, ventricular pacing, and age were predictors of time duration from surgery to the occurrence of AF. Drugs with predominantly beta1-adrenergic receptor affinity were associated with a higher incidence of postoperative AF (dopamine 44%, dobutamine 41% vs. phenylepherine 20%, p = 0.001). CONCLUSION: Use of adrenergic drugs is an independent predictor of postoperative AF after cardiac surgery.

Clinical usefulness and prognostic value of elevated cardiac troponin I levels in acute pulmonary embolism.

BACKGROUND: Right ventricular myocardial ischemia and injury contribute to right ventricular dysfunction and failure during acute pulmonary embolism. The objective of this study was to evaluate the clinical usefulness of cardiac troponin I (cTnI) in the assessment of right ventricular involvement and short-term prognosis in acute pulmonary embolism METHODS: Thirty-eight patients with acute pulmonary embolism were included in the study. Clinical characteristics, right ventricular involvement, and clinical outcome were compared in patients with elevated levels of serum cTnI versus patients with normal levels of serum cTnI. RESULTS: Among the study population (n = 38 patients), 18 patients (47%) had elevated cTnI levels (mean +/- SD 1.6 +/- 0.7 ng/mL, range 0.7-3.7 ng/mL, median, 1.4 ng/mL), and comprised the cTnI-positive group. In the other 20 patients, the serum cTnI levels were normal (< or =0.4 ng/mL), and they comprised the cTnI-negative group. In the cTnI-positive group (n = 18 patients), 12 patients (67%) had right ventricular dilatation/hypokinesia, compared with 3 patients (15%) in the cTnI-negative group (n = 20 patients, P =.004). Right ventricular systolic pressure was significantly higher in the cTnI-positive group (51 +/- 8 mm Hg vs 40 +/- 9 mm Hg, P =.002). Cardiogenic shock developed in a significantly higher number of patients with elevated serum cTnI levels (33% vs 5%, P =.01). In patients with elevated cTnI levels, the odds ratio for development of cardiogenic shock was 8.8 (95% CI 2.5-21). CONCLUSIONS: Patients with acute pulmonary embolism with elevated serum cTnI levels are at a higher risk for the development of right ventricular dysfunction and cardiogenic shock. Serum cTnI has a role in risk stratification and short-term prognostication in patients with acute pulmonary embolism.

Cardiac papillary fibroelastoma: a comprehensive analysis of 725 cases.

BACKGROUND: With the advent of echocardiography, cardiac papillary fibroelastoma (CPF) is being increasingly reported. The demographics, clinical characteristics, pathological features, treatment, and prognosis of CPF are examined. DATA COLLECTIONS: Cases, case series and related articles on the subject in all languages were identified through a comprehensive literature search. RESULTS AND CONCLUSIONS: Seven hundred twenty-five cases of CPF were identified. Males comprised 55% of patients. Highest prevalence was in the 8th decade of life. The valvular surface was the predominant locations of tumor. The most commonly involved valve was the aortic valve, followed by the mitral valve. The left ventricle was the predominant nonvalvular site involved. No clear risk factor for development of CPF has been reported. Size of the tumor varied from 2 mm to 70 mm. Clinically, CPFs have presented with transient ischemic attack, stroke, myocardial infarction, sudden death, heart failure, presyncope, syncope, pulmonary embolism, blindness, and peripheral embolism. Tumor mobility was the only independent predictor of CPF-related death or nonfatal embolization. Symptomatic patients should be treated surgically because the successful complete resection of CPF is curative and the long-term postoperative prognosis is excellent. The symptomatic patients who are not surgical candidates could be offered long-term oral anticoagulation, although no randomized controlled data are available on its efficacy. Asymptomatic patients could be treated surgically if the tumor is mobile, as the tumor mobility is the independent predictor of death or nonfatal embolization. Asymptomatic patients with nonmobile CPF could be followed-up closely with periodic clinical evaluation and echocardiography, and receive surgical intervention when symptoms develop or the tumor becomes mobile.

Cardiac Munchausen syndrome.

OBJECTIVE: To examine the reports on cardiac Munchausen syndrome for clinical characteristics. METHODS: Cases, case series, and related articles on the subject in all languages were identified through a comprehensive literature search. RESULTS: Fifty-eight cases of cardiac Munchausen syndrome were identified. Mean +/- SD patient age was 44 +/- 12 years (range, 23 to 71 years). Fifty-four patients (93%) were men. The most common presenting complaint was chest pain simulating acute coronary syndrome (86%). Syncope and dyspnea were also reported. Mostly, these patients were admitted directly from the emergency department to the coronary care unit. Acute myocardial infarction was the most common admitting diagnosis. The other admitting diagnoses were cardiac arrest and arrhythmia. The average number of hospital admissions for cardiac symptoms was 6 per patient (range, 1 to > 29 admissions). Numerous procedures including cardiac catheterization, coronary angiography, peripheral arteriography, permanent pacemaker placement, electrophysiological studies, intra-aortic balloon insertion, pulmonary artery catheter insertion, and electrical cardioversion have been performed in these patients. Twenty-four patients (41%) had history of undergoing prior multiple invasive procedures, but only 10 of these patients admitted having undergone these procedures. Ninety-five percent of patients altered their stories, with many leaving the hospital against medical advice when confronted with possibility of cardiac Munchausen syndrome as the correct unifying diagnosis. None of the patients reported for follow-up. CONCLUSION: Cardiac Munchausen syndrome results in unnecessary investigations and organ damage from unneeded aggressive procedures. There is scarce information available on the prognosis of these patients, especially in the long term.

Third heart sound: genesis and clinical importance.

Auscultation of third heart sound has been performed for more than a century, an interest that not only persists today, but also has experienced renewed emphasis. Sophisticated study of the third heart sound by current investigative techniques has underscored the value of clinical detection with the time-honored stethoscope. This review re-examines the mechanisms of genesis of third heart sound in regard to the hemodynamic and echocardiographic aspects, and its clinical importance.

Amiodarone for pharmacological cardioversion of recent-onset atrial fibrillation.

The efficacy and safety of amiodarone for pharmacological cardioversion of recent-onset atrial fibrillation was examined by reviewing the trials on the subject identified through a comprehensive literature search. Amiodarone has been used both intravenously (i.v.) and orally for the pharmacological cardioversion of recent-onset atrial fibrillation. Intravenous amiodarone has been used as a bolus only or as a bolus followed by a continuous i.v. infusion until conversion or up to 24 h. The dose of i.v. bolus given ranged from 3 to 7 mg/kg body weight and that of infusion from 900 to 3000 mg/day. The efficacy reported is 34-69% with the bolus only regimens, and 55-95% with the bolus followed by infusion regimens. Only the higher dose (>1500 mg/day) amiodarone is superior to placebo in converting recent-onset atrial fibrillation to sinus rhythm. The highest 24-h conversion rates have been reported with the i.v. regimen of 125 mg/h until conversion or a maximum of 3 g and the oral regimen of 25-30 mg/kg body weight administered as a single loading-dose (>90% and >85%, respectively). Most of the conversions occur after 6-8 h of the initiation of therapy. Predictors of successful conversion are shorter duration of atrial fibrillation, smaller left atrial size, and higher amiodarone dose. Amiodarone is not superior to the other antiarrhythmic drugs conventionally used for the pharmacological cardioversion of recent-onset atrial fibrillation but is relatively safe in patients with structural heart disease and in those with depressed left ventricle function. Therefore, amiodarone could be used particularly in patients with structural heart disease and in those with left ventricular systolic dysfunction as the use of class IC drugs, propafenone and flecainide, for cardioversion of atrial fibrillation is contraindicated in such patients.

Cardiac arrhythmias in pregnancy: clinical and therapeutic considerations.

Pregnancy can precipitate cardiac arrhythmias not previously present in seemingly well individuals. Risk of arrhythmias is relatively higher during labor and delivery. Potential factors that can promote arrhythmias in pregnancy and during labor and delivery include the direct cardiac electrophysiological effects of hormones, changes in autonomic tone, hemodynamic perturbations, hypokalemia of pregnancy, and underlying heart disease. Paroxysmal supraventricular and ventricular tachycardia may cause hemodynamic compromise with consequences to the fetus. Management of arrhythmias in pregnant women is similar to that in non-pregnant but a special consideration must be given to avoid adverse fetal effects. No drug therapy is usually needed for the management of supraventricular or ventricular premature beats, but potential stimulants, such as smoking, caffeine, and alcohol should be eliminated. In paroxysmal supraventricular tachycardia, vagal stimulation maneuvers should be tried first. Adenosine or a cardioselective beta-blocker could be used if vagal maneuvers are ineffective. Alternatively, verapamil or diltiazem may be given. In pregnant women with atrial fibrillation, the goal of treatment is conversion to sinus rhythm or to control ventricular rate by a cardioselective beta-adrenergic blocker drug or digoxin. Ventricular arrhythmias may occur in the pregnant women with cardiomyopathy, congenital heart disease, valvular heart disease, or mitral valve prolapse. Termination of ventricular arrhythmias can usually be achieved by intravenous lidocaine or procainamide or by electrical cardioversion. Amiodarone is not safe for the fetus. Beta-blocker therapy must be continued during pregnancy and postpartum period in women with long QT syndrome and torsade de pointes.

Cardiac troponin I predicts myocardial dysfunction and adverse outcome in septic shock.

OBJECTIVE: The objectives of this study were to determine myocardial injury in patients with septic shock by measuring serum cardiac troponin I (cTnI), to evaluate relationship between elevated cTnI and myocardial dysfunction and to determine if cTnI is a predictor of outcome in these patients. METHODS: Thirty-seven consecutive patients with septic shock were included in the study. Serum cTnI was measured at study entry and after 24 and 48 h. Transthoracic echocardiogram, electrocardiogram and regular biochemical and hemodynamic assessments were performed. RESULTS: Sixteen (43%) patients had elevated serum cTnI. These patients had higher need for inotropic/vasopressor support (94% vs. 53%, p=0.018), higher APACHE II score (28 vs. 20, p=0.004), higher incidence of regional wall motion abnormalities on echocardiography (56% vs. 6%, p=0.002), lower ejection fraction (46% vs. 62%, p=0.04) and higher mortality (56% vs. 24%, p=0.04) compared to normal cTnI patients. By multiple logistic regression analysis, serum cTnI and APACHE II score were independent predictor of death and length of stay in intensive care unit. Serum cTnI, APACHE II score, anion gap and serum lactate were independent predictor of need for inotropic/vasopressor support. Receiver-operating characteristics of serum cTnI as a predictor of death in septic shock were significant. The elevated serum level of cTnI correlated with the lower left ventricular ejection fraction (p<0.001). CONCLUSIONS: Myocardial injury can be determined in patients with septic shock by serum cTnI. Serum cTnI concentration correlates with myocardial dysfunction in septic shock. High serum cTnI predicts increased severity of sepsis and higher mortality. A close monitoring of patients with septic shock and elevated levels cTnI is warranted.

Gender significance of ST-segment deviation detected by ambulatory (Holter) monitoring.

OBJECTIVE: To evaluate the gender influence in diagnostic and prognostic value of Holter-detected ST-segment deviation. METHODS: Two-hundred seventy-seven consecutive patients (196 men) who underwent coronary angiography for evaluation of chest pain were studied with 24-h Holter monitoring within 72 h of coronary angiography, and were followed up for 65+/-21 months. RESULTS: Men had a higher prevalence of coronary artery disease (169 of 196, 86%) compared to that of women (54 of 81, 67%), p<0.00025. Thirty-three (17%) men and 15 (19%) women had ST-segment deviation during 24-h recording. The sensitivity, specificity and positive predictive values of ST-segment deviation (elevation, depression, or both) for the detection of significant coronary artery disease were similar in men and women. The negative predictive values were significantly higher in women than men for ST-segment deviation (36% vs. 15%, p<0.001), ST-segment elevation (35% vs. 14%, p<0.001), and ST-segment depression (34% vs. 15%, p<0.001). Similarly, the diagnostic accuracies were significantly higher in women than men for ST-segment deviation (44% vs. 29%, p<0.025), ST-segment elevation (38% vs. 19%, p<0.001), and ST-segment depression (40% vs. 24%, p<0.025). There was no significant difference in composite end-point of events (mortality, nonfatal myocardial infarction, unstable angina, and coronary revascularization) in men versus women with ST-segment deviation (elevation, depression, or both). CONCLUSION: Holter-detected ST-segment deviation has a higher negative predictive value and diagnostic accuracy for detection of significant coronary artery disease in women than in men, although the prognostic values are not significantly different between men and women.