Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

3,429 questions · 3,558 findings · 436 reviews

No studies found 660 · 18.5%GRADE not reported 375 · 10.5%Very low 727 · 20.4%Low 887 · 24.9%Moderate 709 · 19.9%High 200 · 5.6%

Preoperative inspiratory muscle training vs usual care, non‐exercise intervention

Postoperative atelectasis original authors’ definitions · adult participants undergoing cardiac and major abdominal surgery

Preoperative inspiratory muscle training may leads to lower postoperative atelectasis original authors’ definitions compared with usual care, non‐exercise intervention (low certainty).

1 finding from 1 review

Preoperative inspiratory muscle training vs usual care, non‐exercise intervention

Postoperative pneumonia original authors’ definitions · adult participants undergoing cardiac and major abdominal surgery

Preoperative inspiratory muscle training probably leads to lower postoperative pneumonia original authors’ definitions compared with usual care, non‐exercise intervention (moderate certainty).

1 finding from 1 review

Preoperative inspiratory muscle training vs usual care, non‐exercise intervention

Mechanical ventilation > 48 hours · adult participants undergoing cardiac and major abdominal surgery

It is very uncertain whether preoperative inspiratory muscle training changes mechanical ventilation > 48 hours compared with usual care, non‐exercise intervention (very low certainty).

1 finding from 1 review

Preoperative inspiratory muscle training vs usual care, non‐exercise intervention

Mortality In the early postoperative period (≤ 30 days) · adult participants undergoing cardiac and major abdominal surgery

It is very uncertain whether preoperative inspiratory muscle training changes all‐cause mortality within 30 days during postoperative period compared with usual care, non‐exercise intervention (very low certainty).

1 finding from 1 review

Intervention not reported

Quality of life (dyspnoea) Measured on the CRQ, the output is a number from 0 to 7, where higher on the scale is better. MID is 0.5. · adults with COPD who had exertional dyspnoea but did not fulfil the criteria for long‐term oxygen treatment

The intervention probably leads to higher quality of life (dyspnoea) Measured on the CRQ, the output is a… (moderate certainty).

1 finding from 1 review

Treatment route: intravenous corticosteroid vs oral corticosteroid

Mortality after discharge (1‐3 months) · exacerbations of COPD

Treatment route: intravenous corticosteroid showed no clear difference in mortality after discharge (1‐3 months) compared with oral corticosteroid (moderate certainty).

1 finding from 1 review