2016 OK 69
Okla.2016Background
- Ethel Nelson was treated for an incarcerated hernia and possible bowel perforation; a CT showed free air requiring surgery. She underwent reduction and later surgery, developed sepsis, was given vasopressors (dopamine, norepinephrine/Levophed), and at 3:00 p.m. was switched to vasopressin; she suffered cardiac arrest and died around 11:00 p.m.
- Plaintiffs sued multiple providers; defendants David Shepherd, M.D., and Enid Medical Associates moved to exclude plaintiffs’ experts (Drs. Russell and Sheena) under Daubert/12 O.S. § 2702 and moved for summary judgment on causation grounds.
- The trial court excluded the experts’ testimony as unreliable and granted summary judgment for Shepherd and Enid Medical Associates; the Court of Civil Appeals affirmed.
- The Oklahoma Supreme Court granted certiorari to review the Daubert exclusion and summary judgment de novo.
- The core dispute was whether the experts’ opinions (that a high, non‑tapered vasopressin dose contributed to Nelson’s cardiac arrest) met statutory and Daubert reliability standards for both general causation (vasopressin can cause decreased cardiac output/arrhythmia) and specific causation (it did so here).
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Admissibility — general causation: is vasopressin at high doses capable of causing decreased cardiac output/arrhythmia? | Experts relied on peer‑reviewed studies, animal data, pharmacology, case series, and their clinical experience to show high doses can cause coronary vasoconstriction and decreased cardiac index. | Literature is mixed; key studies criticized as uncontrolled or observational; asserted extrapolation is speculative and lacks solid scientific support. | Experts’ general‑causation methodology (literature, animal data, pharmacology, experience) satisfied Daubert/12 O.S. § 2702; admissible. |
| Admissibility — specific causation: did the high vasopressin dose substantially contribute to Nelson’s death? | Experts performed differential diagnosis, considered and discounted other vasopressors and septic shock as sole causes, and tied timing/clinical course to vasopressin exposure. | Experts failed to rule out alternative causes and relied on temporal correlation and clinical judgment; opinions are ipse dixit/speculative. | Specific‑causation opinions admissible; experts need not exclude every alternative cause; differential diagnosis and probabilistic medical reasoning satisfy admissibility. |
| Effect of exclusion on summary judgment: does exclusion of experts negate causation element and justify summary judgment? | Excluding admissible expert testimony improperly removed causation evidence; summary judgment was therefore improper. | If expert opinions are inadmissible, plaintiffs lack evidence of causation and summary judgment for defendants is appropriate. | Because exclusion was erroneous, summary judgment based on that exclusion must be reversed and case remanded. |
| Standard of appellate review for Daubert ruling and summary judgment | N/A (appellants) | N/A (appellees) | Both the Daubert exclusion and the summary judgment are reviewed de novo when the exclusion effectively eliminates all evidentiary support for a claim; trial court’s gatekeeping cannot rest on legal error. |
Key Cases Cited
- Daubert v. Merrell Dow Pharmaceuticals, Inc., 509 U.S. 579 (U.S. 1993) (framework for assessing scientific reliability of expert testimony)
- General Electric Co. v. Joiner, 522 U.S. 136 (U.S. 1997) (courts may exclude opinions with an unjustified analytical gap between data and conclusion)
- Hollander v. Sandoz Pharmaceuticals Corp., 289 F.3d 1193 (10th Cir. 2002) (caution on extrapolation from limited case reports and need for mechanistic explanation in some contexts)
- Christian v. Gray, 65 P.3d 591 (Okla. 2003) (Oklahoma’s articulation of Daubert review and expert admissibility standards)
- Robinson v. Oklahoma Nephrology Associates, Inc., 154 P.3d 1250 (Okla. 2007) (legal principle that a defendant is liable for any contribution to the plaintiff’s injury; causation need not be sole cause)