Letter by Mattingly et al Regarding Article, “Endovascular Hypothermia in Acute Ischemic Stroke: Pilot Study of Selective Intra-Arterial Cold Saline Infusion”
Bibliographic record
Abstract
We read with interest the article by Chen et al 1 and had many questions about the methodology and findings.This report indicates that a drop in cerebral tissue temperature was observed.However, the Methods section 1 does not describe brain tissue monitoring or external surrogates such as nasopharyngeal temperature.Under the Discussion section, the authors state "we used data from a previous study to estimate the temperature reduction" and, in addition, "…we anticipate that we could have achieved at least a 2°C temperature drop in the ischemic territory."This contradicts the statement presented in the Abstract and Results sections, which states that "The temperature of ischemic cerebral tissue was decreased by at least 2°C during infusion of the cold solution…"; therefore, we are uncertain whether the authors actually measured a drop in brain tissue temperature.In addition, the results indicate that rectal temperature was decreased to 0.1°C.We have assumed the authors' intent is the degree of rectal temperature reduction, not the absolute number; however, this is unclear.We also note that the Abstract 1 states different systemic temperature reduction (maximum 0.3°C) and tables do not show final or postinfusion temperature.We note that this is a safety trial.No evidence of efficacy is presented.However, the high incidence of vasospasm (15.4%) and pneumonia (38.5%) raise questions as to the safety of this technique, which is the primary end point.A prior trial using ice cold saline in diagnostic angiography did not detect angiographic vasospasm. 2The ICTuS-L study (Intravascular Cooling in the Treatment of Stroke-Longer window) detected a significant increase in pneumonia in the hypothermia arm. 3Therefore, we think that both of these measures are relevant to assessing safety and feasibility of endovascular ice cold saline in acute stroke.The lack of a reported baseline nonintervention cohort makes assessment of these critical measures impossible.Unfortunately, this report raises more questions than it answers about the effect and safety of ice cold saline during endovascular treatment of acute ischemic stroke and utility remains completely unknown.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.029 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.003 | 0.002 |
| Scholarly communication | 0.003 | 0.004 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.032 | 0.028 |
| Insufficient payload (model declined to judge) | 0.003 | 0.004 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".