Relationship between intra-operative hypotension and post-operative complications in traumatic hip surgery

Background factors for intra-operative hypotension during hip fracture repair surgery in the elderly under spinal anesthesia managed by orthopedic surgeons: A retrospective case-control study

BACKGROUND

Spinal anesthesia is used for femoral trochanteric fracture surgery, but frequently induces hypotension and the causative factors remain unclear. We examined background factors for the use of an intraoperative vasopressor in elderly patients receiving spinal anesthesia for femoral trochanteric fracture surgery.

METHODS

We retrospectively analyzed 203 patients >75 years (mean age, 87.9 years) with femoral trochanteric fractures who underwent short nail fixation under orthopedically managed spinal anesthesia at our hospital between April 2020 and July 2023. Patients were divided into two groups: group A (intraoperative vasopressor) and group B (no vasopressor). The following data were compared: age, sex, height, weight, body mass index, antihypertensive medication, years of experience as a primary surgeon, bupivacaine dose, puncture level, anesthesia time, operation time, hemoglobin level and blood urea nitrogen/creatinine ratio on the day of surgery, brain natriuretic peptide level, left ventricular ejection fraction, and percentage of patients operated on the day of transport.

RESULTS

There were 65 patients in group A and 138 in group B. The average dose of bupivacaine was 11.7 mg. In a univariate analysis, group A was slightly younger (87.0 vs. 88.3 years), had a higher blood urea nitrogen/creatinine ratio (27.1 vs. 24.5), more frequently received β-blockers (14.1% vs. 5.8 %) and diuretic medications (21.9% vs. 11.6 %), and had a higher puncture level. A logistic regression analysis identified younger age (p = 0.02) and diuretic medication (p = 0.001) as independent risk factors in group A. Vasopressor use was more frequent at a higher puncture level in group A (57 % for L2/3, 33 % for L3/4, 15 % for L4/5, 0 % for L5/S).

CONCLUSIONS

Spinal anesthesia-induced hypotension is attributed to volume deficit or extensive sympathetic blockade and may be prevented by avoiding high puncture levels and increasing preoperative fluid supplementation in patients on diuretics. There is currently no consensus on anesthetic dosages.

Hypotension prediction index for the prevention of hypotension during surgery and critical care: A narrative review

Surgeons and anesthesia clinicians commonly face a hemodynamic disturbance known as intraoperative hypotension (IOH), which has been linked to more severe postoperative outcomes and increases mortality rates. Increased occurrence of IOH has been positively associated with mortality and incidence of myocardial infarction, stroke, and organ dysfunction hypertension. Hence, early detection and recognition of IOH is meaningful for perioperative management. Currently, when hypotension occurs, clinicians use vasopressor or fluid therapy to intervene as IOH develops but interventions should be taken before hypotension occurs; therefore, the Hypotension Prediction Index (HPI) method can be used to help clinicians further react to the IOH process. This literature review evaluates the HPI method, which can reliably predict hypotension several minutes before a hypotensive event and is beneficial for patients' outcomes.

Differences in the Incidence of Hypotension and Hypertension between Sexes during Non-Cardiac Surgery: A Systematic Review and Meta-Analysis

Background: Major determinants of blood pressure (BP) include sex and age. In youth, females have lower BP than males, yet in advanced age, more pronounced BP increases result in higher average BPs in females over 65. This hypothesis-generating study explored whether age-related BP divergence impacts the incidence of sex-specific intraoperative hypotension (IOH) or hypertension. Methods: We systematically searched PubMed and Embase databases for studies reporting intraoperative BP in males and females in non-cardiac surgery. We analyzed between-sex differences in the incidence of IOH and intraoperative hypertension (primary endpoint). Results: Among 793 identified studies, 14 were included in this meta-analysis, comprising 1,110,636 patients (56% female). While sex was not associated with IOH overall (females: OR 1.10, 95%CI [0.98-1.23], I2 = 99%), a subset of studies with an average age ≥65 years showed increased exposure to IOH in females (OR 1.17, 95%CI [1.01-1.35], I2 = 94%). One study reported sex-specific differences in intraoperative hypertension, with a higher incidence in females (31% vs. 28%). Conclusions: While sex-specific reporting on intraoperative BP was limited, IOH did not differ between sexes. However, an exploratory subgroup analysis offers the hypothesis that females of advanced age may face an increased risk of IOH, warranting further investigation.

Association of intraoperative hypotension and severe postoperative complications during non-cardiac surgery in adult patients: A systematic review and meta-analysis

Background

Intraoperative hypotension (IOH) is a common side effect of non-cardiac surgery that might induce poor postoperative outcomes. The relationship between the IOH and severe postoperative complications is still unclear. Thus, we summarized the existing literature to evaluate whether IOH contributes to developing severe postoperative complications during non-cardiac surgery.

Methods

We conducted a comprehensive search of PubMed, Embase, Cochrane Library, Web of Science, and the CBM from inception to 15 September 2022. The primary outcomes were 30-day mortality, acute kidney injury (AKI), major adverse cardiac events (myocardial injury or myocardial infarction), postoperative cognitive dysfunction (POCD), and postoperative delirium (POD). Secondary outcomes included surgical-site infection (SSI), stroke, and 1-year mortality.

Results

72 studies (3 randomized; 69 non-randomized) were included in this study. Low-quality evidence showed IOH resulted in an increased risk of 30-day mortality (OR, 1.85; 95% CI, 1.30-2.64; P < .001), AKI (OR, 2.69; 95% CI, 2.15-3.37; P < .001), and stroke (OR, 1.33; 95% CI, 1.21-1.46; P < .001) after non-cardiac surgery than non-IOH. Very low-quality evidence showed IOH was associated with a higher risk of myocardial injury (OR, 2.00; 95% CI, 1.17-3.43; P = .01), myocardial infarction (OR, 2.11; 95% CI, 1.41-3.16; P < .001), and POD (OR, 2.27; 95% CI, 1.53-3.38; P < .001). Very low-quality evidence showed IOH have a similar incidence of POCD (OR, 2.82; 95% CI, 0.83-9.50; P = .10) and 1-year-mortality (OR, 1.66; 95% CI, 0.65-4.20; P = .29) compared with non-IOH in non-cardiac surgery.

Conclusion

Our results suggest IOH was associated with an increased risk of severe postoperative complications after non-cardiac surgery than non-IOH. IOH is a potentially avoidable hazard that should be closely monitored during non-cardiac surgery.

Hypotension following hip fracture surgery in patients aged 80 years or older: A prospective cohort study

Background

Hip fractures occurring in older patients often result in significant anemia, even hemodynamic disorders and hypoperfusion. The present study aims to investigate the general characteristics of hypotension following hip fracture surgery (HFHFS) and its effect on clinical outcomes.

Methods

A total of 168 patients aged ≥80 years who underwent hip fracture surgery at a tertiary orthopaedic hospital from January 1, 2020 to August 31, 2020 were enrolled and followed up for one year. Patients were divided into HFHFS and non-HFHFS cohorts according to blood pressure within 24 h after surgery. General difference comparison, univariate and multivariate regression, and survival analysis were applied to investigate the association between HSHSF and in-hospital and one-year clinical outcomes.

Results

The incidence of HFHFS was 23.8% (40/168), with a median time to onset of 8.0 (5.0-12.0) hours after surgery. The HFHFS group had more chronic heart disease before injury and experienced more positive fluid balance on the day of surgery (P values were 0.032 and 0.028, respectively). After adjustment for potential confounders, HFHFS was associated with prolonged length of hospital stay (B 2.66, 95% CI 0.22, 5.10; P = 0.033), postoperative cardiac dysfunction (OR 2.92, 95% CI 1.05, 8.11; P = 0.039), and postoperative brain dysfunction (OR 3.51, 95% CI 1.50, 8.23; P = 0.004). HFHFS had no effect on one-year modified Rankin Scale (mRS) (B 0.28, 95% CI -0.28, 0.84; P = 0.322) and one-year mortality (HR 1.07, 95% CI 0.29, 3.96; P = 0.917).

Conclusion

Many older patients develop hypotension several hours after hip fracture surgery, which may be related with preexisting decline in cardiac reserve in addition to postoperative hidden blood loss. Patients who experienced HFHFS were more likely to have postoperative cardiac and brain dysfunction and longer hospital stay. However, HFHFS had no significant effect on mRS and mortality at one year.

Research progress in influence of perioperative hypotension on postoperative outcome of patients

With the advancement of disease treatments, the number of patients undergoing surgery worldwide is increasing. However, many patients still experience severe perioperative complications. Perioperative hypotension is one of the common side effects during surgery. Physiologically, perioperative hypotension can lead to insufficient perfusion of important organs and result in acute and chronic irreversible organ injury, which cause serious consequences for the patient's postoperative hospitalization and even the long-term outcome. Therefore, in order to optimize perioperative circulation management and improve the quality of life for patients after surgery, it is of great importance to investigate the relationship between perioperative hypotension and postoperative myocardial injury, ischemic stroke, postoperative delirium, acute kidney injury, and postoperative mortality. Individualized circulation management and reasonable application of vasoactive drugs may be the key point to early prevention and correct treatment of perioperative hypotension, which is of great significance for reducing perioperative related morbidity and mortality and improving the prognosis for the surgical patients.