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van der Zaag PD, Geurts S, Rozema R, Reininga IHF, van Minnen B. Maxillofacial haemorrhagic symptoms in emergency department patients: impact of antithrombotics. Eur J Trauma Emerg Surg 2024; 50:543-550. [PMID: 38197899 PMCID: PMC11035474 DOI: 10.1007/s00068-023-02428-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 12/11/2023] [Indexed: 01/11/2024]
Abstract
PURPOSE To investigate the effect of antithrombotics on the occurrence of maxillofacial haemorrhagic symptoms, and to determine if these haemorrhagic symptoms are predictors of maxillofacial fractures. METHOD A prospective cohort study was conducted of consecutive patients with maxillofacial trauma who had been admitted to the emergency department of four hospitals in the Netherlands. This study compared five haemorrhagic symptoms (peri-orbital haematoma, raccoon eyes, epistaxis, subconjunctival ecchymosis, and intra-oral haematoma) between patients not-using (NUA) and using (UA) of antithrombotics, and whether these maxillofacial haemorrhagic symptoms served as predictors for maxillofacial fractures. RESULTS Out of the 1005 patients, 812 (81%) belonged to the NUA group, and 193 (19%) to the UA group. UA patients exhibited higher frequencies of peri-orbital hematoma (54% vs. 39%, p < 0.001), raccoon eyes (10% vs. 5%, p = 0.01), and subconjunctival ecchymoses (16% vs. 7%, p < 0.001). In NUA, peri-orbital hematoma (OR = 2.5, p < 0.001), epistaxis (OR = 4.1, p < 0.001), subconjunctival ecchymosis (OR = 2.3, p = 0.02), and intra-oral hematoma (OR = 7.1, p < 0.001) were significant fracture predictors. Among UA, peri-orbital hematoma (OR = 2.2, p = 0.04), epistaxis (OR = 5.4, p < 0.001), subconjunctival ecchymosis (OR = 3.7, p = 0.008), and intra-oral hematoma (OR = 22.0, p < 0.001) were significant fracture predictors. CONCLUSION Maxillofacial haemorrhagic symptoms were observed more frequently in the UA group than in the NUA group. However, in both groups, maxillofacial haemorrhagic symptoms appear to be predictors of maxillofacial fractures. Caution is warranted in attributing these symptoms solely to antithrombotic use during emergency department assessments.
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Affiliation(s)
- Pieter Date van der Zaag
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
| | - Stephanie Geurts
- Faculty of Dentistry and Oral Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Romke Rozema
- Department of Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Inge H F Reininga
- Department of Trauma Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
- Emergency Care Network Northern Netherlands (AZNN), Northern Netherlands Trauma Registry, Groningen, The Netherlands
| | - Baucke van Minnen
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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Rozema R, Moumni ME, de Vries GT, Spijkervet FKL, Verbeek R, Kleinbergen JYJ, Bens BWJ, Doff MHJ, van Minnen B. A clinical decision aid for patients with suspected midfacial and mandibular fractures (the REDUCTION-I study): a prospective multicentre cohort study. Eur J Trauma Emerg Surg 2022; 48:4243-4254. [PMID: 35430710 PMCID: PMC9532332 DOI: 10.1007/s00068-022-01968-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Accepted: 03/26/2022] [Indexed: 12/26/2022]
Abstract
Purpose To assess physical examination findings related to maxillofacial trauma to identify patients at risk of midfacial and mandibular fractures and then to construct a clinical decision aid to rule out the presence of midfacial and mandibular fractures in emergency department patients. Methods We performed a prospective multicentre cohort study in four hospitals in the Netherlands, including consecutive patients with maxillofacial trauma. Each patient received a standardized physical examination consisting of 15 and 14 findings for midfacial and mandibular traumas, respectively. Consequently, clinical decision aids were constructed with the focus being on ruling out the presence of midfacial and mandibular fractures, and diagnostic accuracy was calculated. Results A total of 993 consecutive patients were identified of whom 766 and 280 patients were suspected of midfacial and mandibular fractures, respectively. Midfacial fractures were diagnosed in 339 patients (44.3%), whereas mandibular fractures were observed in 66 patients (23.6%). The decision aid for midfacial trauma consisting of peri-orbital hematoma, epistaxis, ocular movement limitation, infra-orbital nerve paresthesia, palpable step-off and tooth mobility or avulsion, produced a sensitivity of 89.7 (86.0–92.5), a specificity of 42.6 (38.0–47.4), and a negative predictive value of 83.9% (78.4–88.2). The decision aid for mandibular trauma consisting of the angular compression test, axial chin pressure test, objective malocclusion, tooth mobility or avulsion and the tongue blade bite test resulted in a sensitivity of 98.5 (91.9–99.7), a specificity of 34.6 (28.5–41.2), and a negative predictive value of 98.7% (92.8–99.8). Conclusion The constructed clinical decision aids for maxillofacial trauma may aid in stratifying patients suspected for midfacial and mandibular fractures to reduce unnecessary diagnostic imaging. Clinical Trial Registration The study was registered at ClinicalTrials.gov with the identifier NCT03314480. Supplementary Information The online version contains supplementary material available at 10.1007/s00068-022-01968-1.
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Affiliation(s)
- Romke Rozema
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands.
| | - Mostafa El Moumni
- Department of Trauma Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Gysbert T de Vries
- Department of Emergency Medicine, Isala Hospital, Zwolle, The Netherlands
| | - Frederik K L Spijkervet
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
| | - René Verbeek
- Department of Emergency Medicine, Nij Smellinghe Hospital, Drachten, The Netherlands
| | | | - Bas W J Bens
- Department of Emergency Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Michiel H J Doff
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
- Department of Oral and Maxillofacial Surgery, Nij Smellinghe Hospital, Drachten, The Netherlands
| | - Baucke van Minnen
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
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van der Zaag PD, Rozema R, Poos HP, Kleinbergen JY, van Minnen B, Reininga IH. Maxillofacial fractures in electric and conventional bicycle related accidents. J Oral Maxillofac Surg 2022; 80:1361-1370. [DOI: 10.1016/j.joms.2022.03.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 03/31/2022] [Accepted: 03/31/2022] [Indexed: 11/15/2022]
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Rozema R, Doff MHJ, Delli K, Spijkervet FKL, van Minnen B. Diagnostic accuracy of physical examination findings for midfacial fractures: a systematic review and meta-analysis. Clin Oral Investig 2022; 26:3405-3427. [PMID: 35298710 PMCID: PMC8979892 DOI: 10.1007/s00784-022-04423-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 02/19/2022] [Indexed: 12/03/2022]
Abstract
Objectives To conduct a systematic review and meta-analysis to assess the diagnostic accuracy of physical examination findings and related clinical decision aids for midfacial fractures in comparison to computed tomography and cone beam computed tomography. Material and methods A systematic review was performed by searching the MEDLINE, Cochrane, EMBASE, and CINAHL databases. Risk of bias was assessed using the Quality Assessment of Diagnostic Accuracy Studies-2 tool. Pooled sensitivity, specificity, and diagnostic odds ratios with the corresponding 95% confidence intervals were calculated for each physical examination finding and reported clinical decision aids. Results After screening 2367 records, 12 studies were included. High risk of patient selection bias was detected in three studies (25%). Additionally, high concerns regarding applicability were found for the patient selection in five studies (41.7%), and for the reference standard in eleven studies (91.7%). Of the total 42 individual physical examination findings, only 31 were suitable for a meta-analysis. High specificity and low sensitivity were found for most findings. The pooled diagnostic odds ratio ranged from 1.07 to 11.38. Clinical decision aids were reported by 8 studies, but none were constructed specifically for midfacial fractures. Conclusion Based on the current available evidence, the absence of physical examination findings can successfully identify patients who do not have a midfacial fracture, but the presence of individual findings does not necessarily mean that the patient has a midfacial fracture. Although various clinical decision aids were presented, none focused on exclusively midfacial fractures. Clinical relevance The diagnostic accuracy of physical examination findings can be used to diagnose a midfacial fracture so as to reduce unnecessary imaging, health care costs, and exposure to ionizing radiation. Supplementary Information The online version contains supplementary material available at 10.1007/s00784-022-04423-y.
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Affiliation(s)
- Romke Rozema
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands.
| | - Michiel H J Doff
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands.,Department of Oral and Maxillofacial Surgery, Nij Smellinghe Hospital, Drachten, The Netherlands
| | - Konstantina Delli
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
| | - Frederik K L Spijkervet
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
| | - Baucke van Minnen
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
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Rozema R, Kruitbosch HT, van Minnen B, Dorgelo B, Kraeima J, van Ooijen PMA. Structural similarity analysis of midfacial fractures-a feasibility study. Quant Imaging Med Surg 2022; 12:1571-1578. [PMID: 35111649 DOI: 10.21037/qims-21-564] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 08/17/2021] [Indexed: 12/29/2022]
Abstract
The structural similarity index metric is used to measure the similarity between two images. The aim here was to study the feasibility of this metric to measure the structural similarity and fracture characteristics of midfacial fractures in computed tomography (CT) datasets following radiation dose reduction, iterative reconstruction (IR) and deep learning reconstruction. Zygomaticomaxillary fractures were inflicted on four human cadaver specimen and scanned with standard and low dose CT protocols. Datasets were reconstructed using varying strengths of IR and the subsequently applying the PixelShine™ deep learning algorithm as post processing. Individual small and non-dislocated fractures were selected for the data analysis. After attenuating the osseous anatomy of interest, registration was performed to superimpose the datasets and subsequently to measure by structural image quality. Changes to the fracture characteristics were measured by comparing each fracture to the mirrored contralateral anatomy. Twelve fracture locations were included in the data analysis. The most structural image quality changes occurred with radiation dose reduction (0.980036±0.011904), whilst the effects of IR strength (0.995399±0.001059) and the deep learning algorithm (0.999996±0.000002) were small. Radiation dose reduction and IR strength tended to affect the fracture characteristics. Both the structural image quality and fracture characteristics were not affected by the use of the deep learning algorithm. In conclusion, evidence is provided for the feasibility of using the structural similarity index metric for the analysis of structural image quality and fracture characteristics.
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Affiliation(s)
- Romke Rozema
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Herbert T Kruitbosch
- Center for Information Technology, University of Groningen, Groningen, The Netherlands
| | - Baucke van Minnen
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Bart Dorgelo
- Department of Radiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.,Department of Radiology, Martini Hospital, Groningen, The Netherlands
| | - Joep Kraeima
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Peter M A van Ooijen
- Department of Radiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.,Department of Radiation Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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Rozema R, Doff MHJ, El Moumni M, Boomsma MF, Spijkervet FKL, van Minnen B. Diagnostic accuracy of physical examination findings for midfacial and mandibular fractures. Injury 2021; 52:2616-2624. [PMID: 34103150 DOI: 10.1016/j.injury.2021.05.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 04/24/2021] [Accepted: 05/21/2021] [Indexed: 02/02/2023]
Abstract
OBJECTIVES To assess the diagnostic accuracy of physical examination findings used to identify patients at risk for midfacial or mandibular fractures. MATERIALS AND METHODS A five-year retrospective cohort was constructed from all emergency department patients with a midfacial or mandibular trauma. The sensitivity, specificity, pre-test probability, positive predictive value, negative predictive value, positive likelihood ratio and negative likelihood ratio data was calculated for 19 and 14 physical examination findings for midfacial and mandibular fractures respectively. Computed Tomography and panoramic radiography were used as index tests. RESULTS A total of 1484 patients were identified among whom 40.4% midfacial and 33.4% mandibular fractures were diagnosed. Overall, specificity was found to be higher than sensitivity. Regarding midfacial fractures, high specificity was found for raccoon eyes, malar eminence flattening and all the findings that are related to palpation, the nasal, ocular and intra-oral assessment. Malar eminence flattening, external nasal deformity, nasal septum hematoma, change of globe position and palpable step-off had ad high positive predictive value and positive likelihood ratio. Regarding mandibular fractures high specificity was found for mouth opening restriction, auditory canal bleeding, intra-oral assessment related findings, palpable step-off, inferior alveolar nerve paresthesia, the angular compression test and chin axial pressure test. CONCLUSIONS The diagnostic accuracy of relevant physical examination findings were identified for the prediction of midfacial and mandibular fractures.
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Affiliation(s)
- Romke Rozema
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, Netherlands.
| | - Michiel H J Doff
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, Netherlands; Department of Oral and Maxillofacial Surgery, Nij Smellinghe Hospital, Drachten, Netherlands
| | - Mostafa El Moumni
- Department of Trauma Surgery, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | | | - Frederik K L Spijkervet
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Baucke van Minnen
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
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Rozema R, Kruitbosch HT, van Minnen B, Dorgelo B, Kraeima J, van Ooijen PMA. Iterative reconstruction and deep learning algorithms for enabling low-dose computed tomography in midfacial trauma. Oral Surg Oral Med Oral Pathol Oral Radiol 2020; 132:247-254. [PMID: 34034999 DOI: 10.1016/j.oooo.2020.11.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 08/31/2020] [Accepted: 11/25/2020] [Indexed: 11/19/2022]
Abstract
OBJECTIVES The objective of this study was to quantitatively assess the image quality of Advanced Modeled Iterative Reconstruction (ADMIRE) and the PixelShine (PS) deep learning algorithm for the optimization of low-dose computed tomography protocols in midfacial trauma. STUDY DESIGN Six fresh frozen human cadaver head specimens were scanned by computed tomography using both standard and low-dose scan protocols. Three iterative reconstruction strengths were applied to reconstruct bone and soft tissue data sets and these were subsequently applied to the PS algorithm. Signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs) were calculated for each data set by using the image noise measurements of 10 consecutive image slices from a standardized region of interest template. RESULTS The low-dose scan protocol resulted in a 61.7% decrease in the radiation dose. Radiation dose reduction significantly reduced, and iterative reconstruction and the deep learning algorithm significantly improved, the CNR for bone and soft tissue data sets. The algorithms improved image quality after substantial dose reduction. The greatest improvement in SNRs and CNRs was found using the iterative reconstruction algorithm. CONCLUSION Both the ADMIRE and PS algorithms significantly improved image quality after substantial radiation dose reduction.
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Affiliation(s)
- Romke Rozema
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
| | - Herbert T Kruitbosch
- Center for Information Technology, University of Groningen, Groningen, The Netherlands
| | - Baucke van Minnen
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Bart Dorgelo
- Department of Radiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands; Department of Radiology, Martini Hospital, Groningen, The Netherlands
| | - Joep Kraeima
- Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Peter M A van Ooijen
- Department of Radiation Oncology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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Rozema R, Doff MH, van Ooijen PM, Postmus D, Westerlaan HE, Boomsma MF, van Minnen B. Diagnostic reliability of low dose multidetector CT and cone beam CT in maxillofacial trauma-an experimental blinded and randomized study. Dentomaxillofac Radiol 2018; 47:20170423. [PMID: 29745761 DOI: 10.1259/dmfr.20170423] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVES To assess the diagnostic reliability of low dose multidetector CT (MDCT) and cone beam CT (CBCT) for zygomaticomaxillary fracture diagnosis. METHODS Unilateral zygomaticomaxillary fractures were inflicted on four out of six fresh frozen human cadaver head specimens. All specimens were scanned using four MDCT and two CBCT imaging protocols of which the radiation exposure was systematically reduced. A blinded diagnostic routine was simulated at which 16 radiologists and 8 oral and maxillofacial (OMF) surgeons performed randomized image assessments. We considered the findings during an open operative approach of the zygomatic region as the gold standard. RESULTS Zygomaticomaxillary fractures were correctly diagnosed in 90.3% (n = 130) of the image assessments. The zygomatic arch was most often correctly diagnosed (91.0%). The zygomatic alveolar crest showed the lowest degree of correct diagnosis (65.3%). Dose reduction did not significantly affect the objective visualization of fractures of the zygomaticomaxillary complex. The sensitivity and specificity also remained consistent among the low dose scan protocols. Dose reduction did not decrease the ability to assess dislocation, comminution, orbital volume, volume rendering and soft tissues. OMF surgeons considered the low dose protocols sufficient for treatment planning. CONCLUSIONS Dose reduction did not decrease the diagnostic reliability of MDCT and CBCT for the diagnosis of zygomaticomaxillary fractures.
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Affiliation(s)
- Romke Rozema
- 1 Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | | | - Peter Ma van Ooijen
- 2 Center for Medical Imaging - North East Netherlands (CMI-NEN2), University Medical Center Groningen, University of Groningen, Groningen , Groningen , The Netherlands.,3 Department of Radiology, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Douwe Postmus
- 4 Department of Epidemiology, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Henriëtte E Westerlaan
- 3 Department of Radiology, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
| | - Martijn F Boomsma
- 5 Department of Radiology, Isala Hospital , Zwolle , The Netherlands
| | - Baucke van Minnen
- 1 Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen , Groningen , The Netherlands
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Rozema R, van der Mast PJ, El Moumni M, Boonstra EA, Jacobs B, Poos HPAM. [Challenges in the diagnostic management of fat embolism syndrome - from divergence in clinical presentation to diagnosis]. Ned Tijdschr Geneeskd 2018; 162:D2259. [PMID: 29600926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This article discusses the diagnosis and management of two patients with cerebral fat embolism syndrome after traumatic femoral fractures. Fat embolism syndrome is a condition which is caused by fat globules in the systemic circulation; it most often occurs in patients with femoral fractures. Patients develop systemic dysfunction, particularly a triad of a petechial rash, respiratory and neurological dysfunction. The syndrome is characterized by a diverse clinical presentation which often necessitates a wide differential diagnosis. The pathogenesis of fat embolism syndrome has not yet been fully elucidated. Although it has been a formally recognised clinical diagnosis for years, new diagnostic imaging capabilities have provided a shift towards a visualisable disorder. Presently, there is no clear evidence and indication for dedicated treatment and therefore supportive measures remain the only treatment modality.
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Affiliation(s)
- R Rozema
- Rijksuniversiteit Groningen-Universitair Medisch Centrum Groningen, Groningen
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Affiliation(s)
- L Laslett
- Cardiology Division, University of California, Davis, Sacramento 95817
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