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Open research questions in Cardiovascular and Diving-Related Complications

37 unresolved questions extracted from the limitations and future-work sections of 241 Cardiovascular and Diving-Related Complications papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The paper highlights that postoperative confirmation of appropriate caval drainage should be standard practice during inferior ASD repair but does not specify which imaging modality (intraoperative TEE, immediate postoperative TTE, or CT angiography timing) provides the most practical and accurate real-time verification before cardiopulmonary bypass weaning.

    Hypoxemia After Inferior Atrial Septal Defect Repair Due to Iatrogenic Diversion of Inferior Vena Cava to Left Atrium: A Case Report · 2026 · DOI

  • Risk stratification criteria for which inferior or low-lying ASD patients are at highest risk for iatrogenic caval diversion (based on defect size, location, rim anatomy, or patient age) have not been formally defined. A multicenter case-control study comparing anatomical features of inferior ASDs that experienced IVC diversion versus uncomplicated repairs would enable preoperative risk assessment.

    Hypoxemia After Inferior Atrial Septal Defect Repair Due to Iatrogenic Diversion of Inferior Vena Cava to Left Atrium: A Case Report · 2026 · DOI

  • While CT angiography definitively visualizes IVC pathway and patch configuration, the relative diagnostic sensitivity and specificity of transthoracic echocardiography with contrast versus transesophageal echocardiography versus CT angiography for detecting iatrogenic IVC-to-left atrium diversion has not been systematically compared. A diagnostic accuracy study across these three modalities in inferior ASD repair cases would establish the optimal imaging algorithm.

    Hypoxemia After Inferior Atrial Septal Defect Repair Due to Iatrogenic Diversion of Inferior Vena Cava to Left Atrium: A Case Report · 2026 · DOI

  • The proposed mechanism of misidentification of the inferior rim versus the Eustachian valve during patch closure remains unconfirmed due to lack of intraoperative imaging documentation. Prospective studies comparing real-time echocardiographic guidance versus standard anatomical landmarks during inferior ASD repair are needed to identify which identification technique prevents iatrogenic IVC-to-left atrium diversion.

    Hypoxemia After Inferior Atrial Septal Defect Repair Due to Iatrogenic Diversion of Inferior Vena Cava to Left Atrium: A Case Report · 2026 · DOI

  • The operative details and anatomical findings from the revision surgery were not available, limiting characterization of the specific corrective techniques used and the intraoperative confirmation of appropriate IVC redirection to the right atrium. Documentation protocols should standardize detailed operative notes for revision cases of iatrogenic caval diversion to establish best practices for surgical correction.

    Hypoxemia After Inferior Atrial Septal Defect Repair Due to Iatrogenic Diversion of Inferior Vena Cava to Left Atrium: A Case Report · 2026 · DOI

  • Intraoperative transesophageal echocardiography documentation from the index ASD repair surgery was unavailable, preventing direct visualization of the surgical technique and patch placement during the procedure that led to iatrogenic IVC diversion. Future cases should mandate complete perioperative TEE recording and archiving for inferior ASD repairs to enable retrospective analysis of anatomical misidentification mechanisms.

    Hypoxemia After Inferior Atrial Septal Defect Repair Due to Iatrogenic Diversion of Inferior Vena Cava to Left Atrium: A Case Report · 2026 · DOI

  • Meticulous and timely evaluation with appropriate methods and scheduling re-evaluations to follow possible resolution of residual effects if needed may help optimise FTD assessments.

    Post COVID-19 fitness to dive assessment findings in occupational and recreational divers · 2022 · DOI

  • The study results, though preliminary, may contribute to the development of guidelines for FTD assessment after COVID-19, indicating a need for formal guideline development.

    Post COVID-19 fitness to dive assessment findings in occupational and recreational divers · 2022 · DOI

  • Divers taking FTD assessments after COVID-19 need to be scrutinised with respect to cardiac and thrombotic effects, as increased risk of decompression sickness due to hypercoagulable state and hyperinflammation after COVID-19 is a concern.

    Post COVID-19 fitness to dive assessment findings in occupational and recreational divers · 2022 · DOI

  • Another limitation may be the absence of pulmonary function tests. Spirometric studies do not provide data on structural abnormalities but could have presented a more comprehensive evaluation of pulmonary changes in divers, though these tests were temporarily ceased in most centres due to contamination risks.

    Post COVID-19 fitness to dive assessment findings in occupational and recreational divers · 2022 · DOI

  • The major limitation is the heterogeneity of the study group, FTD assessment times and evaluated parameters, which was inevitable due to the design of the study and variations in presentation and management of the disease.

    Post COVID-19 fitness to dive assessment findings in occupational and recreational divers · 2022 · DOI

  • The connection between the title topic (fitness to dive after COVID-19) and the main content (HBOT for breast cancer LRTI) appears disconnected; the relationship between these domains and applicability of findings to COVID-19 diving fitness is unclear from this excerpt.

    Diving after SARS-CoV-2 (COVID-19) infection: Fitness to dive assessment and medical guidance · 2020 · DOI

  • While the paper discusses HBOT mechanisms (stem cell induction, angiogenesis stimulation) in treating LRTI, the excerpt does not explore individual variability in tissue response or personalized predictors of treatment success.

    Diving after SARS-CoV-2 (COVID-19) infection: Fitness to dive assessment and medical guidance · 2020 · DOI

  • The paper mentions identifying risk factors for persistent symptoms after HBOT as a study objective, but the excerpt does not provide details on what those risk factors are or how comprehensively they were analyzed.

    Diving after SARS-CoV-2 (COVID-19) infection: Fitness to dive assessment and medical guidance · 2020 · DOI

  • The study objective focuses on reporting HBOT effects on LRTI symptoms after breast cancer up to 12 months post-HBOT, but the paper excerpt does not discuss longer-term follow-up beyond this timeframe or whether symptoms continue to improve or deteriorate thereafter.

    Diving after SARS-CoV-2 (COVID-19) infection: Fitness to dive assessment and medical guidance · 2020 · DOI

  • At present, HBOT is used in children in similar indications as in adults, as well as in perinatal, neurologic and neuro-developmental conditions, even though there is only limited evidence of it offering any benefit for such conditions.

    Hyperbaric Oxygen Therapy (HBOT) in Pediatrics · 2018 · DOI

  • The RAI (Rantala Anatomical Index) demonstrates higher scores for barotrauma/AGE cases versus off-gassing cases in deep diving scenarios, but its predictive utility requires validation across a larger dataset with controlled depth ranges (shallow vs. intermediate vs. deep) and documented ascent profiles to establish RAI thresholds specific to dive conditions.

    Understanding scuba diving fatalities: carbon dioxide concentrations in intra-cardiac gas · 2017 · DOI

  • Alternative sampling sites including gastric gas and pulmonary gas lack standardized CT scan and laser-guided sampling protocols. These sites should be validated as confirmatory samples with defined anatomical landmarks and sampling techniques to enable consistent differentiation of endogenous CO2 formation from diving gas embolism.

    Understanding scuba diving fatalities: carbon dioxide concentrations in intra-cardiac gas · 2017 · DOI

  • The influence of post-mortem delay on gas redistribution and diffusion between cardiac tissue and intracardiac cavity has been identified as a potential CO2 concentration variable but not quantified. Studies are needed to measure how sampling timing (hours to days post-mortem) affects cardiac CO2 values under controlled temperature and body handling conditions.

    Understanding scuba diving fatalities: carbon dioxide concentrations in intra-cardiac gas · 2017 · DOI

  • The analytical methodology described can detect noble gases (helium in trimix, argon in drysuit insulation), but no case data is provided demonstrating detection or quantification of these gases in diving fatalities. Protocol development and validation for detecting helium and argon in cardiac samples from technical diving fatalities remains unaddressed.

    Understanding scuba diving fatalities: carbon dioxide concentrations in intra-cardiac gas · 2017 · DOI

  • The quantitative relationship between resuscitation protocol parameters (mechanical ventilation type, oxygen vs. air, CPR duration) and intracardiac gas composition changes has not been systematically documented. Studies must isolate the effects of specific resuscitation interventions on cardiac gas concentrations to distinguish resuscitation artifacts from pathological embolism gases.

    Understanding scuba diving fatalities: carbon dioxide concentrations in intra-cardiac gas · 2017 · DOI

  • The anatomical precision of intracardiac gas sampling has not been systematically assessed in human subjects. Published human studies lack comparison of gas composition across specific sampling sites (femoral artery vs. femoral vein vs. subclavian vein vs. pulmonary vessels), which is essential to establish standardized cardiac sampling protocols for diving fatality investigations.

    Understanding scuba diving fatalities: carbon dioxide concentrations in intra-cardiac gas · 2017 · DOI

  • Cardiac CO2 concentrations cannot serve as a standalone diagnostic parameter for differentiating barotrauma/AGE from off-gassing fatalities because values overlap (10-12 µmol·ml⁻¹) in shallow to medium depth dives. More cases with documented dive profiles, depths, durations, and ascent rates are needed to establish predictive power and CO2 threshold values specific to diving depth ranges.

    Understanding scuba diving fatalities: carbon dioxide concentrations in intra-cardiac gas · 2017 · DOI

  • Abstract The lack of evidence for the tissue-factor dependent activation of the coagulation system and the release of thrombin on one hand, and a decreased concentration of factor XII after short term air, saturated air and heliox exposures, as well as an increased concentration of the plasmin-antiplasmin complex (PAP) after short dives indicate that diving and decompression possibly affect fibrinolysis.

    Factor XII – A Limitation for Divers? · 2015 · DOI

  • How the current results of calibrating SQV to SvO2 can be translated to the awake individual, has not yet been investigated.

    Monitoring changes in mixed venous oxygen saturation using photoplethysmography on the sternum – a proof of concept study · 2026 · DOI

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37 open questions have been extracted from the limitations and future-work passages of 241 Cardiovascular and Diving-Related Complications papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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