Single Muscle Fiber Calcium Wave Frequency Assay for Malignant Hyperthermia Diagnosis: An Exploratory Validation Study
Authors' conclusion
The CaWFa effectively discriminates MHS from MHN muscle in response to halothane, offering a comparable sensitivity and specificity to the IVCT.
Study context
- Population
- Patients undergoing routine in vitro contracture test (IVCT) muscle biopsies for malignant hyperthermia diagnosis
- Participants
- 30 patients
- Comparison
- Calcium wave frequency assay vs in vitro contracture test
- Outcome
- Diagnostic sensitivity and specificity of CaWFa (regenerative calcium wave induction and wave frequency in single skinned muscle fibers challenged with halothane and caffeine) vs IVCT
Methodological detailsexploratory validation
- Exploratory validation
Performance
As reported in the abstract
CaWFa diagnostic performance (onset 1 mM halothane + wave frequency threshold 1.57 waves/min)
| Test or model | Sensitivity | Specificity |
|---|---|---|
| Calcium wave frequency assay (CaWFa) | 92% | 88% |
Calcium wave frequency assay (CaWFa)
Sensitivity92%
Specificity88%
Further findings
Fibers with regenerative calcium waves, 0.5 mM halothane
Fibers with regenerative calcium waves, 1 mM halothane
Calcium wave frequency in halothane
- Elevated in MH susceptible (MHS) vs MH normal (MHN) fibers at all tested halothane concentrations
Calcium wave onset and frequency in caffeine
- No difference between groups
Original publication
Single Muscle Fiber Calcium Wave Frequency Assay for Malignant Hyperthermia Diagnosis: An Exploratory Validation Study. Anesthesiology. Published 5 December 2025. doi:10.
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