Dr. Belz performed an examination and interview of the claimant on January 17, 2007. Heexplained his diagnosis as follows:
Basically, this individual has Wegener's disease, wherein as a result of the silica exposure, the silica is taken into the lungs, various types of white cells try to digest the silica. The white cell cannot. There are various debris products that are produced as a result of this attempt to attack the silica. The silica's kind of like asbestos. You can't dissolve it, and then various by-products are made and released, and the body then makes antibodies to these by-products. The antibodies then attack the kidneys and kill the kidneys.
Also other white cells in the lungs, in trying to attack and to wall off and to corral and to kill this silica invader, these white cells form granulomas in the lung, and this also results in masses within the lung, and this then results in scarring and fibrosis within the lung as well as within the kidney.
By his own testimony he then performed medical research, spending 25 to 30 hours. The results of his research are as follows:
- "Epidemiology of Wegener's granulomatosis: Lessons from descriptive studies and analyses of genetic and environmental risk determinants," Clinical \& Experimental Rheumatology, 24(2Suppl 41):S82-91, 2006, Mar-Apr.
Dr. Belz' testimony: Individuals have susceptibilities, particularly white males, northern hemisphere, ages 50-60, and if someone with a susceptibility works in an environment with respirable silica, that individual will develop Wegener's faster than other individuals (first Belz deposition [08/17/07] at page 59, lines 16, through page 60, line 4).
- "Epidemiology of systemic vasculitis," Current Rheumatology Reports, 7(4):270-5, 2005 Aug.
Dr. Belz' testimony: Genetic and environmental factors, including infection, drugs, and silica are all important in the etiology for systemic vasculitis (first Belz deposition [08/17/07] at page 61, lines 17-22).
- "Wegener's disease and exposure to silica. Study of the physiopathological mechanisms," Presse Medicale, 33 (19 pt 1):1349-51, 2004 Nov 6.
Dr. Belz testimony: Silica particles may trigger immunopathological mechanisms because the silica is ingested by certain white cells which then create certain by-products or are destroyed, and the by-products or destroyed cells provoke an immune response consisting of antibodies that then attack the kidneys (first Belz deposition [08/17/07] at page 62 , line 14 , through page 53 , line 5 ).
- "Silicon exposure and vasculitis, Current Opinion in Rheumatology, 10(1):12-7, 1998 Jan.
Dr. Belz' testimony: When someone is susceptible to vasculitis and they are put in a dusty silica environment, they will get the disease (first Belz deposition [08/17/07] at page 68, line 23, through page 69, line 5).
5, "Subclinical Signs of Kidney Dysfunction following Short Exposure to Silica in the Absence of Silicosis," Nephron 1995; 70:438-442.
Dr. Belz' testimony: It is not necessary to have full-blown silicosis to have kidney damage from silica exposure (first Belz deposition [08/17/07] at page 70, lines 17-19).
- "End-stage Renal Disease Among Silica-Exposed Gold Miners: A New Method for Assessing Incidence Among Epidemiologic Cohorts," JAMA, Volume 277(15), April 16, 1997, 1219-1223.
Dr. Belz' testimony: This article establishes a dose-response relationship (as the dose goes up, the incidence of disease goes up) and shows that the group studied developed glomerulonephritis as a result of exposure to silica (first Belz deposition [08/17/07] at page 71, line 25, through page 72, line 9).
As part of his analysis to determine causation in this case he then applied criteria from a set of criteria
presented by Sir Austin Bradford Hill for the purpose of determining cause and effect relationships in epidemiology (the study of disease in populations). However, these criteria are widely used in the medical field as a method of determining cause and effect in specific cases. Dr. Belz' application of these criteria in forming an opinion as to causation is as follows:
To summarize then, the strength of the association and the consistency of the associations are assured referencing silica exposure and the outcome of vasculitis affecting the pulmonary system as well as the renal system. Silica exposure is associated with glomerulonephritis as well as the immune medicated lung disease. Silica exposure is associated with Wegener's granulomatosis . To that end, I have included five case control studies and one retrospective cohort study demonstrating this association.
I have also included references discussing biologic plausibility exploring the mechanisms by which silica acts on a susceptible individual to induce and indeed promote vasculitis as well as inflammatory and indeed immune responses. Silica is known to produce such responses in other disease states as well.
The dose response relationship is qualitatively established through the history provided. As you know, I requested industrial hygiene data from the company. You informed me that the company had refused to provide that data. Regardless, dose response relationship is established referencing job description and detailed description of the functions performed by Mr. Rufer over time. See IME report of 1/17/07. I might add, the breathing zone exposures to Mr. Rufer were quite substantial.
Temporal correctness is assured. That is, the outcome of lung and renal disease followed the silica exposure. Specificity is likewise met. Silica is known to produce the exact responses found in the case of Mr. Rufer. Literature references to all are provided.
Employee offered the rebuttal testimony of Norbert Belz, M.D., through his deposition on March 25, 2008. After reviewing Dr. Parmet's report, Dr. Parmet's deposition transcript, and all references cited by Dr. Parmet, Dr. Belz testified that his opinion remained the same, i.e., the lung and kidney disorders (known as Wegener's) of Greg Rufer were caused or contributed to be caused by Mr. Rufer's exposure to sand and silica at Monett Metals.
Dr. Belz again testified that the prevailing factor for the Wegener's diagnosis and its sequela was the exposure to sand and silica at Monett metals.
Finally, Dr. Belz testified that Mr. Rufer was permanently and totally disabled since August 12, 2006, and that due to his fatigue and need to recline during any work shift at least twice for thirty minutes as well as the fact that he is now on dialysis it is not expected that an employer would hire him. He further indicated Mr. Rufer has a need for "very, very extensive future medical" treatment to relieve him of the symptoms of the disease as it cannot be cured. This treatment includes dialysis, medications, possible kidney transplant, and pulmonary status treatment. Employer offered no evidence to dispute these issues.
Contrary to Dr. Parmet's testimony, Dr. Belz testified that he located seven generally accepted, wellestablished textbooks that discuss the causal association between silica and Wegener's and vasculitis in general.
- Oxford Textbook of Medicine.
Dr. Belz' testimony: Pages 8 and 9 say that "Case-control studies indicate that silica predisposes to ANCA-associated crescentic nephritis and Wegener's granulomatosis," which means that a person who has the genetic potential and is exposed to silica will develop Wegener's granulomatosis.