Incidence, characteristics and risk factors for alveolar recruitment maneuver-related hypotension in patients undergoing laparoscopic colorectal cancer resection

Table 1 The occurrence of alveolar recruitment maneuver-related hypotension

ARM-related hypotension1	MAP < 60 mmHg2	MAP ≤ 55 mmHg
Patients having hypotension, n (%)	34 (24.3)	17 (12.1)
Patients having hypotension ≥ two times, n	3	2
ARMs with hypotension/total ARMs, No. (%)	37/1027 (3.61)	19/1027 (1.85)
ARM1 or ARMlast with hypotension, No.	27	12
Recovery without vasopressor, No.	27	NA3
ARMs under nonpneumoperitoneum conditions	33/349 (9.46)4	16/349 (4.58)
With hypotension/total ARMs, No. (%)
ARM1 with hypotension, No. (%)	18/135 (13.3)5,6	9/135 (6.7)
ARMlast with hypotension, No. (%)	9/134 (6.7)7	3/134 (2.2)

¹Hypotension occurred during an alveolar recruitment maneuver (ARM) or within 5 min after an ARM.

²Primary endpoint: A mean arterial pressure (MAP) < 60 mmHg during an ARM or within 5 min after an ARM.

³NA: No analysis because vasopressors must be given according to the study protocol when MAP ≤ 55 mmHg.

⁴P < 0.01 compared with ARMs under pneumoperitoneum conditions (4 of 678, 0.59%).

⁵P < 0.01 compared with non-ARM₁ points (19 of 892, 2.13%).

⁶Five participants did not receive ARM₁ because of a MAP ≤ 65 mmHg.

⁷Six participants did not receive ARM_last because they met the intraoperative exclusion criteria.

Data are given as counts or counts (proportion). MAP: Mean arterial pressure; ARM: Alveolar recruitment maneuver; ARM₁: The first ARM; ARM_last: The last ARM; bpm: Beats per minute; NA: Not available.