Tim Jen MD MHSc FRCPC (@DrTimJen) header
Tim Jen MD MHSc FRCPC (@DrTimJen) profile picture

Tim Jen MD MHSc FRCPC

@DrTimJen

🇨🇦 Regional Anesthesiologist. Clinical Researcher. St. Paul's Hospital at the University of British Columbia, Vancouver.

 Vancouver, British Columbia
Joined April 2017
  • Tweets1.4K
  • Following526
  • Followers643
102Media
Photo by Tim Jen MD MHSc FRCPC (@DrTimJen)Photo by Tim Jen MD MHSc FRCPC (@DrTimJen)Photo by Tim Jen MD MHSc FRCPC (@DrTimJen)Photo by Tim Jen MD MHSc FRCPC (@DrTimJen)Photo by Tim Jen MD MHSc FRCPC (@DrTimJen)Photo by Tim Jen MD MHSc FRCPC (@DrTimJen)Photo by Tim Jen MD MHSc FRCPC (@DrTimJen)Photo by Tim Jen MD MHSc FRCPC (@DrTimJen)Photo by Tim Jen MD MHSc FRCPC (@DrTimJen)
New video: Navigating the Difficult Spinal Anesthesia. youtube.com/watch?v=ig_6uusG… #CASAM2026 #Regional #Anesthesia #Spinal
Navigating the Difficult Spinal Anesthesia [Complete 2026 Version]

Navigating the Difficult Spinal Anesthesia [Complete 2026 Version]

00:00 - Introduction & Background 01:04 - Case Study: Mrs. F (Land...

youtube.com
1
10
2
30
5,145
Pneumothorax rates following cardiac surgery with versus without continuous serratus anterior plane catheters: a secondary analysis of trial data with propensity score matching to a historic cohort - Canadian Journal of Anesthesia Access - buff.ly/PKXOsSG @CASUpdate
Image from CJA - Canadian Journal of Anesthesia (@CJA_Journal)
3
4
741
A few rebound pain-related, mechanistic studies that you've never heard of pubmed.ncbi.nlm.nih.gov/3306… pubmed.ncbi.nlm.nih.gov/2490… pubmed.ncbi.nlm.nih.gov/1221… pubmed.ncbi.nlm.nih.gov/2097… pubmed.ncbi.nlm.nih.gov/4235…
1
3
5
268
Fine I admit it, I've never heard of them either (until today)
61
Tim Jen MD MHSc FRCPC retweeted
Tom Quick (@TJQPNI) profile picture
Tom Quick@TJQPNI15 Jul 2021
Here are the links to my examinations for #Ulnar #Median & #Radial nerves with @OrthohubXYZ m.youtube.com/watch?v=QSL01k… m.youtube.com/watch?v=aebOTJ… m.youtube.com/watch?v=glOvMd…
Image from Tom Quick (@TJQPNI)
38
1
95
Replying to @ashwani_doc @michyaries888 @jeffgadsden @DrRobbieErskine @DrJeniMD @deepak_neuro @amit_pawa @EMARIANOMD @RegionalAnaesUK @DaraEsra @ESRA_trainees @ESRA_Society @Steve_Coppens @DrTuhinM @curromir @dr_rajgupta @nelkassabany @ajrmacfarlane @claralexlobo @saraamaralMD @ruthi_landau @Nadia_Hdz_MD @Duke_Anesthesia @SretroPMD @rakesh6282 @davejohnston24 @Ropivacaine @NarouzeMD @HouthoffKavita @MKwesiKwofie @DrTimJen @ChrisPrabhakar @jon_bailey_anes @athmathottungal
My strong advocacy for Nerve Stimulator even in the era of ultrasound is when “the eyes cannot see what the mind does not know" ! & when 👀 cannot see at all ! PNS is a great tool box in #regionalanethesia @NYSORA advocates most often ! @Jerryblocksthat For me it’s a MUST !
Image from 🩺 Hari (హరి 🇮🇳) Kalagara (@KalagaraHari)
10
10
1
35
1,286
Editor’s Recommendation✏️ Propensity scores can balance measured covariates—but they do not establish causality. New #KJA Statistical Round: how to align estimands (ATE/ATT), covariate selection, overlap, and unmeasured confounding for sound causal interpretation. PS matching ≠ causality. doi.org/10.4097/kja.26332 #Anesthesiology #Causality #ConfoundingFactors #ObservationalStudy #PropensityScore #TreatmentOutcome #SCIE #MEDLINE #KJA
Illustration of positivity and overlap in PS-based analyses. Panel (A) shows adequate overlap in propensity score distributions between the treatment and control groups, supporting valid comparisons. Panel (B) shows limited overlap, in which extreme propensity scores may lead to unstable estimates, particularly in inverse probability of treatment weighting. Limited overlap reduces both the validity and generalizability of causal effect estimates.

ALT Illustration of positivity and overlap in PS-based analyses. Panel (A) shows adequate overlap in propensity score distributions between the treatment and control groups, supporting valid comparisons. Panel (B) shows limited overlap, in which extreme propensity scores may lead to unstable estimates, particularly in inverse probability of treatment weighting. Limited overlap reduces both the validity and generalizability of causal effect estimates.

1
1
56
Is it a surprise that there are so many concerns with LAST with continuous SPIP blockade? Fig 1. Blue dot: ribs Large white dot: major arterial perforators Fig 2. Black dot = ITA perforators Fig 3. Coronal section Br J Plast Surg. 1986; 39: 287-99
Image from Tim Jen MD MHSc FRCPC (@DrTimJen)
Image from Tim Jen MD MHSc FRCPC (@DrTimJen)
Image from Tim Jen MD MHSc FRCPC (@DrTimJen)
2
2
3
231
To learn the innervation of the costal, diaphragmatic, and mediastinal parietal pleura --> Use a wire to scratch around in awake humans. Costal pleura: Intercostal nerves Diaphragmatic pleura: Outer rim intercostal nerves Inner rim phrenic nerves. Capps, J. Arch Intern Med 1911
Image from Tim Jen MD MHSc FRCPC (@DrTimJen)
Image from Tim Jen MD MHSc FRCPC (@DrTimJen)
1
116
Our entire understanding of visceral innervation of pleura, pericardium, lung parenchyma, heart, and coronaries are based on few wild studies 100 years ago. Lewis T. Pain. New York: MacMillan 1942.
Image from Tim Jen MD MHSc FRCPC (@DrTimJen)
1
97
Any centres in this world other than Montreal doing pleural drain bupivacaine inj after cardiac surgery? pmc.ncbi.nlm.nih.gov/article… Seems appealing and clinically effective
Injection of Bupivacaine into the Pleural and Mediastinal Drains: A Novel Approach for Decreasing...

Injection of Bupivacaine into the Pleural and Mediastinal Drains: A Novel Approach for Decreasing...

We conducted a chart review of prospectively collected data in order to demonstrate the safety and efficacy of an innovative technique of pleural and mediastinal drain injections. Patients who had...

pmc.ncbi.nlm.nih.gov
1
1
119
Reviewed for this open-access journal. Recommended Reject. Editor decided to accept without revision, "based partly on my recommendation". Ok.
1
1
3
277
Yes I learned my lesson
40
Accurate, except more like 12 hours, and one citation.
Image from Tim Jen MD MHSc FRCPC (@DrTimJen)
109
I just love this figure that differentiates between association vs causation in observational studies. From Causal Inference: What if? (Miguel Hernan)
Image from Tim Jen MD MHSc FRCPC (@DrTimJen)
1
140
You know what would be a rad conference talk? Bias in observational regional anesthesiology research It'd be super cool for a methodology-heavy conference like IARS.
1
2
311
Interpreting relative risks and odds ratios after propensity score matching: practical guidance for clinical research doi.org/10.4097/kja.25973 📕 How do RR and OR behave after propensity score matching? Discover when they diverge, why collapsibility matters, and how to evaluate effect estimate robustness in your clinical research. Read our practical guidance! #SCIE #MEDLINE #KJA
Venn diagram depicting the joint and marginal probabilities of exposure (E) and disease (D). This diagram is used to illustrate the algebraic equivalence between exposure-based and disease-based odds ratios via Bayes’ theorem.

ALT Venn diagram depicting the joint and marginal probabilities of exposure (E) and disease (D). This diagram is used to illustrate the algebraic equivalence between exposure-based and disease-based odds ratios via Bayes’ theorem.

2
2
179
Statistics is a lot more interesting than philosophy.
1
2
246
🥼 New R1s, new skills, and lots of hands-on learning! 💨🫁 #Bootcamp #AirwayWorkshop #ProceduresWorkshop #POCUS/eFASTWorkshop #UBCAnesthesia #AnestesiaResidency #UBC #Anesthesia
Image from UBC Anesthesiology Residency Program (@ubc_anes)
Image from UBC Anesthesiology Residency Program (@ubc_anes)
Image from UBC Anesthesiology Residency Program (@ubc_anes)
Image from UBC Anesthesiology Residency Program (@ubc_anes)
1
6
284
Does anyone have experience doing retrospective cohort study using target trial emulation framework? Sounds good in theory but wondering about practical pitfalls. Advice from experience really appreciated.
1
115
ovid.com/10.1097/ALN.0000000… This is an important volunteer study showing that peripheral nerve blockade, in itself, is unlikely to CAUSE hyperalgesia upon block resolution. This study offers important mechanistic insights into rebound pain pathogenesis.
Evaluation of Postblock Hypersensitivity Using... : Anesthesiology

Evaluation of Postblock Hypersensitivity Using... : Anesthesiology

Background:The problem of a sharp increase in pain after resolution of a nerve block, known as rebound pain, has been increasingly recognized. It is...

ovid.com
1
110
Load more