Effect of Different Ventilation Modes on POCD in Elderly Patients with Abdominal Wall Hernia

Range Score <21 Increased odds of dementia Score >25 Decreased odds of dementia Education Score < 21 Abnormal for 8" grade Score <23 Abnormal for high school education Score <24 Abnormal for college education Severity 24-30 No cognitive impairment 18-23 Mild cognitive impairment 0-17 Severe cognitive impairment

The ONSD was assessed using ocular ultrasonography to non-invasively capture ICP. Bedside ultrasound measurements of the ONSD were performed by an experienced and professionally qualified ultrasound physician. Patients were positioned supine with their eyes softly closed, and their eyes were protected with disposable transparent patches. A 7.5 MHz linear probe (Micromaxx Ultrasound System; SonoSite Inc., Bothell, WA, USA) was gently placed on the closed upper eyelid without applying pressure to the eyeball, and sufficient ultrasound gel was applied to ensure clear imaging. The optic nerve sheath was checked and measured 3 mm beyond the globe, and three ONSD measures were performed, with the average value utilized as the final ONSD measurement, which was accurate to 0.01 mm.

Mean airway pressure affects the patient's alveolar oxygenation status and blood circulation. Mean airway pressure is most affected by positive end-expiratory pressure, followed by prolongation of inspiratory time, which can also increase mean airway pressure.

Esophageal pressure monitoring is a minimally invasive and clinically available method for estimating transpulmonary pressure, of which absolute values and changes are considered one of the main determinants of lung injury due to mechanical forces applied during mechanical ventilation . PES was monitored using a floating catheter (Swan-Ganz, USA) placed into the esophagus and coupled to a monitor (M8003A, Germany).

Arterial reference value: 35-45 mmHg, exceeding or falling below the reference value is called hyper- or hypocapnia. Exceeding 55mmHg may inhibit the respiratory center. It is the main index to determine the acid-base poisoning of each type.

Above 60 mmHg is sufficient to provide organ sustenance in the general population.calculated as MAP = diastolic pressure + 1/3 pulse pressure difference.

Normal values for heart rate are 60-100 beats per minute.

In the morning, 10 mL of venous blood from the upper limbs was withdrawn under fasting conditions, put into polypropylene EDTA anticoagulation tubes, centrifuged at 1 000 r/min for 3 min within 60 min (maximal centrifugal force: 27 700×g), and plasma was extracted, frozen in a refrigerator at -20 ℃, and then left to be measured. Plasma Aβ1-40 and inflammatory indexes were detected by enzyme-linked immunosorbent assay in the two groups.

In the morning, 10 mL of venous blood from the upper limbs was withdrawn under fasting conditions, put into polypropylene EDTA anticoagulation tubes, centrifuged at 1 000 r/min for 3 min within 60 min (maximal centrifugal force: 27 700×g), and plasma was extracted, frozen in a refrigerator at -20 ℃, and then left to be measured. Plasma Aβ1-40 and inflammatory indexes were detected by enzyme-linked immunosorbent assay in the two groups.

In the morning, 10 mL of venous blood from the upper limbs was withdrawn under fasting conditions, put into polypropylene EDTA anticoagulation tubes, centrifuged at 1 000 r/min for 3 min within 60 min (maximal centrifugal force: 27 700×g), and plasma was extracted, frozen in a refrigerator at -20 ℃, and then left to be measured. Plasma Aβ1-40 and inflammatory indexes were detected by enzyme-linked immunosorbent assay in the two groups.

In the morning, 10 mL of venous blood from the upper limbs was withdrawn under fasting conditions, put into polypropylene EDTA anticoagulation tubes, centrifuged at 1 000 r/min for 3 min within 60 min (maximal centrifugal force: 27 700×g), and plasma was extracted, frozen in a refrigerator at -20 ℃, and then left to be measured. Plasma Aβ1-40 and inflammatory indexes were detected by enzyme-linked immunosorbent assay in the two groups.

In the morning, 10 mL of venous blood from the upper limbs was withdrawn under fasting conditions, put into polypropylene EDTA anticoagulation tubes, centrifuged at 1 000 r/min for 3 min within 60 min (maximal centrifugal force: 27 700×g), and plasma was extracted, frozen in a refrigerator at -20 ℃, and then left to be measured. Plasma Aβ1-40 and inflammatory indexes were detected by enzyme-linked immunosorbent assay in the two groups.