unit18 fields
| sample_size | number | Participants allocated/enrolled to this unit — the randomized or baseline-characteristics-table N, before attrition. Do NOT use the analyzed/complete-case N when they differ under dropout. Prefer the baseline Table 1 N; fall back to the CONSORT 'allocated' count. |
| age_years | average | Age at enrollment/baseline in years. |
| female_percent | number | Percentage female in this unit. Calculate the complement if only male is given (60% male = 40% female). If the cohort is sex-restricted by procedure or eligibility, infer accordingly (a female-only procedure → 100; a male-only procedure → 0). |
| withdrawals | number | Participants in this unit who withdrew consent or discontinued participation between randomization/enrollment and final analysis. Count only consent-withdrawal and active discontinuation — do not include participants who remained enrolled but were not reached for follow-up. |
| lost_to_follow_up | number | Participants in this unit who remained enrolled but could not be reached for the final outcome assessment. Count only contact-loss with retained consent. If the paper reports a single combined count without distinguishing consent-withdrawal from contact-loss, record the combined count here and note the combined nature in the comment. |
| donor_count | number | Number of heart donors contributing to this unit. Restrict to the heart subset when the paper reports multi-organ procurement; do not use pooled multi-organ donor N. When only pooled multi-organ donor counts are reported with no heart breakout, mark ambiguous and comment 'heart sub-cohort not separately reported'. |
| donor_age_years | average | Donor age at donation in years for hearts in this unit. Restrict to heart donors when multi-organ series report other organs alongside. |
| donor_male_percent | number | Percentage of heart donors in this unit who are male. Calculate complement if only female given (60% female = 40% male). Restrict to the heart-donor subset in multi-organ series. |
| donor_cause_of_death | textharmonize | Primary cause of donor death for hearts in this unit. Format as a short noun phrase (e.g., 'trauma', 'anoxia', 'CVA/stroke', 'mixed: trauma 40%, anoxia 35%, CVA 25%'). When only a distribution is given, summarise the leading causes with percentages; when a single cause defines the cohort, state that cause. |
| total_warm_ischemia_time_minutes | average | Total warm ischemia time in minutes for donated hearts in this unit (withdrawal of life-sustaining therapy to reperfusion or cold flush, as the paper defines total WIT). Convert from hours if needed. Distinct from functional warm ischemia time; when the paper reports only one WIT without labelling total vs functional, record it here and note the ambiguous label in the comment. |
| functional_warm_ischemia_time_minutes | average | Functional warm ischemia time in minutes for donated hearts in this unit (onset of functional ischemia — typically systolic BP <50 mmHg or SpO2 <70% — to reperfusion or cold flush, as defined by the paper). Convert from hours if needed. Distinct from total warm ischemia time; do not copy total WIT here unless the paper explicitly equates them. |
| recipient_age_years | average | Heart transplant recipient age at transplant in years for this unit. Restrict to heart recipients when multi-organ series report other organ recipients alongside. |
| recipient_male_percent | number | Percentage of heart transplant recipients in this unit who are male. Calculate complement if only female given (60% female = 40% male). Restrict to the heart-recipient subset in multi-organ series. |
| nrp_type | TA-NRPA-NRPmixed | Normothermic regional perfusion configuration used for heart recovery in this unit. TA-NRP = thoracoabdominal NRP; A-NRP = abdominal-only NRP; mixed = unit pools recipients of more than one NRP type (state per-type counts in the comment when reported). When the paper procures a heart and does not explicitly name the NRP type, infer TA-NRP. not_applicable on non-NRP units (scs, mp, dnc). |
| nrp_duration_minutes | average | Duration of in-situ NRP in minutes for hearts in this unit (start of regional perfusion to cessation/cross-clamp). Convert from hours if needed. not_applicable on non-NRP units. |
| nrp_temperature_celsius | average | Target or measured NRP perfusate temperature in degrees Celsius for hearts in this unit. not_applicable on non-NRP units. |
| heparin_timing | pre-mortempost-mortem | Timing of systemic heparin administration relative to circulatory death declaration for donors in this unit. pre-mortem = heparin given before withdrawal of life-sustaining therapy or before death declaration; post-mortem = heparin given only after death declaration. not_applicable when heparin use is not part of the recovery protocol and on arms where the paper never addresses heparin. |
| preservation_adjunct | text | Additional ex-situ or in-transit preservation steps applied after NRP or direct procurement for hearts in this unit, beyond the arm's defining modality. Format as a short noun phrase (e.g., 'OCS Heart after TA-NRP', 'static cold storage only', 'hypothermic machine perfusion'). State 'none' when no adjunct beyond the arm-defining technique is used. |