Table 3. Proportion meta-analysis of cardiac arrest rates in Brazilian studies by time period.
| Time period | Studies n |
I2% | Events n | Patients n | Proportion meta-analysis per 10,000 anesthetics (95% CI) | P value for subgroup |
|---|---|---|---|---|---|---|
| Pre-1990 versus 1990–2020 | ||||||
| Perioperative cardiac arrest | ||||||
| Pre-1990 | 1 | NA | 205 | 51,422 | 39.87 (34.60–45.50) | < 0.0001 |
| 1990–2020 | 5 | 98.3 | 757 | 439,002 | 17.61 (9.21–28.68) | |
| Anesthesia-related cardiac arrest | ||||||
| Pre-1990 | 1 | NA | 74 | 51,422 | 14.39 (11.29–17.86) | < 0.0001 |
| 1990–2020 | 3 | 6.5 | 60 | 152,650 | 3.90 (2.93–5.01) | |
| Entirely anesthesia-related cardiac arrest | ||||||
| Pre-1990 | 1 | NA | 36 | 51,422 | 7.00 (4.89–9.49) | < 0.0001 |
| 1990–2020 | 2 | 91.8 | 10 | 94,097 | 0.58 (0.00–3.72) | |
Abbreviations. I2: indicates heterogeneity among studies; CI = confidence interval; NA = not available