레이블이 spine fusion인 게시물을 표시합니다. 모든 게시물 표시
레이블이 spine fusion인 게시물을 표시합니다. 모든 게시물 표시

2014년 5월 26일 월요일

Perioperative morbidity and mortality after anterior, posterior, and anterior/posterior spine fusion surgery

Brief review

전방, 후방 그리고 전/후방 척추 유합술 후의 합병증 및 사망률에 대해 연구한 논문 입니다.
National Inpatient Sample을 이용해 해당기간동안 전방, 후방 그리고 전/후방 척추 유합술을 시행한 입원환자의 표본을 구하여 사망률, 동반질환 발병률, 합병증 발병률 등을 조사하고 사망률에 대한 risk factor를 알아보았습니다.
결론적으로, 전방 및 전/후방 척추 유합술 환자들이 후방 경유 환자에 비해 더 젊고 동반질환의 발병률이 적었지만 사망률은 더 높았습니다.



*Title: Perioperative morbidity and mortality after anterior, posterior, and anterior/posterior spine fusion surgery

*Authors: Stavros G. Memtsoudis , Vassilios I. Vougioukas, Yan Ma, Licia K. Gaber-Baylis, Federico P. Girardi
*Bilbiography: Spine (Phila Pa 1976). 2011 Oct 15;36(22):1867-77.



STUDY DESIGN
Analysis of population-based national hospital discharge data collected for the National Inpatient Sample(NIS).


OBJECTIVE
-To examine demographics of patients undergoing primary anterior spine fusion (ASF), posterior spine fusion (PSF), and anterior/posterior spine fusion (APSF) of the noncervical spine.

-To assess the incidence of perioperative morbidity and mortality, and determine independent risk factors for in-hospital death.


SUMMARY OF BACKGROUND DATA
The utilization of surgical fusion has been increasing dramatically. Despite this trend, a paucity of literature addressing perioperative outcomes exists.


METHODS
-Subjects: National Inpatient Sample (1998~2006)
-Discharges with a procedure code for primary noncervical spine fusion were included in the sample.
-The prevalence of patient as well as health care system-related demographics were evaluated by procedure type (ASF, PSF, and APSF).
-Frequencies of procedure-related complications and in-hospital mortality were analyzed.
-Independent predictors for in-hospital mortality were determined.


RESULTS
-We identified 261,256 entries representing an estimated 1,273,228 hospitalizations for primary spine fusion.
ASF and APSF patients were significantly younger and had lower average comorbidity indeces than PSF patients. 
(age: 44.8 ± 0.08 and 44.22 ± 0.11 yrs vs 52.12 ± 0.04 yrs  / comorbidity: 0.30 ± 0.002 and 0.31 ± 0.004 vs 0.41 ± 0.002)

The incidence of complications:
- ASF: 18.68%
- PSF: 15.72%
- APSF: 23.81% (P < 0.0001)








^ comorbidity(동반질환)의 종류 별 분포율

In-hospital mortality rates: APSF were twice of PSF (0.51 ± 0.038 vs. 0.26 ± 0.012) (P < 
0.0001)

Risk factors for in-hospital mortality included the following: male gender, increasing age, and increasing comorbidity burden. Several comorbidities and complications independently increased the risk for perioperative death, as did underlying spinal pathology (APSF and ASF compared to PSF)

 

CONCLUSION

-Despite being performed in generally younger and healthier patients, APSF and ASF are associated with increased morbidity and mortality.

2014년 1월 6일 월요일

Fusion risk score: evaluating baseline risk in thoracic and lumbar fusion surgery

Brief review

이 논문은 척추유합술의 위험도를 score로 나타내는 FRS(Fusion Risk Score)와 관련된 내용 입니다. 두 가지 만성질환이 동시에 나타나는 범위와 수술적 요소(접근방법, 레벨, 골절술) 등이 수술 위험도의 예후인자로서 증명되었다는 사실을 바탕으로  후향적 연구를 진행하였습니다. 
해당기간 내에 흉추 혹은 요추에 유합술을 시행한 364명의 환자를 대상으로 신장, 폐, 심장등에서의 만성질환과 나이, 당뇨병, approach방법, level등을 조사하였고 FRS scale로 나타냈습니다.
그 결과, 위의 항목들은수술에 대한 예후인자로서 통계적으로 유의한 값을 나타내었습니다. (p값이 모두 0.05보다 작았다)
FRS는 유합술을 받은 후의 위험성을 예측하며, FRS 를 환자에게 적절히 이용하면 외과의는 수술 전후의 위험성을 통제할 수 있다는 결론 입니다.


*Title: Fusion risk score: evaluating baseline risk in thoracic and lumbar fusion surgery.
유합술 위험도 지수: 흉추와 요추 유합술의 기준 위험치 평가

*Authors: Nathan L. Hartin, Amir A. Mehbod, Siddharth B. Joglekar, Ensor E. Transfeldt





STUDY DESIGN
Retrospective cohort study.



OBJECTIVE
Fusion Risk Score (FRS)
-To assess the risk of spine fusion surgery preoperatively.
-To control risk through tailoring intervention and explain differences in complication profile in high-complexity practice (for surgeon)



SUMMARY OF BACKGROUND DATA
-Research has identified and elevated risk of fusion surgery in elderly, yet the rate of such surgery continues to increase.
-A range of comorbidities and the surgical factors are demonstrated predictors of perioperative risk.



METHODS
Retrospective review
Subject number: 364 fusion patient (over 65yrs)
Follow-up period: 18-month
-Logistic regression analysis: To identify factors predictive for perioperative events.
-The predictive variables: incorporated into the FRS scaled from 1 to 20.
-Patient demographics and comorbidities: incorporated into the FRS patient score (maximum 10)
-surgical approach, levels, and osteotomies: FRS procedure score (maximum 10).



RESULTS
Multivariate analysis demonstrated those(1~8) are predictive of perioperative events.
1. chronic kidney disease (odds ratio [OR] = 5.3, 95% confidence interval [CI]: 1.5-18.6, P = 0.008),
2. chronic obstructive pulmonary disease (OR = 5.3, 95% CI: 2.0-14.2, P < 0.001),
3. ischemic heart disease (OR = 4.1, 95% CI: 2.0-8.4, P < 0.001)
4. open anterior approach (OR = 3.6, 95% CI: 1.4-9.3, P = 0.010)
5. diabetes (OR = 3.0, 95% CI: 1.4-6.4, P = 0.004)
6. previous spinal surgery at the same site (OR = 2.6, 95% CI: 1.3-4.9, P = 0.005)
7. age (OR = 1.07, 95% CI: 1.01-1.13, P = 0.019)
8. the number of motion segments fused (P = 0.049)

- FRS was highly predictive of 1)perioperative events, 2)intensive care unit admission, 3)operative time, 4)blood loss, 5)length of stay(all P < 0.0001).

-A score over threshold 9 carries a greater than 50% risk of perioperative events.

(처음에 연구대상 환자가 436명이었으나 동의서 받지 못한 환자, missing data, 연구제외기준에 해당하는 환자를 차례로 제외하고 나니 364명이 남았음)



CONCLUSION
-The FRS predicts the risk of complications after spine fusion surgery and risk of intensive care unit admission, operative time, blood loss, and postoperative length of stay.
-By balancing the FRS procedure score to the patient, the surgeon can quantify and control perioperative risk.



Odds ratio [OR]: 두 집단(실험군, 대조군)의 이항변수(성공, 발병 등)에 관한 승산 비를 나타내는 단위(배율)
예) 수술 성공 비, 질병 발병률 등.
이 논문의 result에 나온 내용을 예로 들어보면, 
choronic kidney disease(만성 신장 질환)의 Odds ratio (OR )=5.3 일 때
만성신장질환을 함께 가지고 있는 환자가 척추유합술을 시행했을 경우, 신장질환이 없는 환자에 비해 수술전후의 위험도가 5.3배 높다는 것 입니다.
odds ratio에 관한 자세한 내용은 빠른 시일 내에 정리하여 포스팅 하겠습니다.