ID Miscellany|physical Exam|Signs|Humanities #idmesh
๐๐๐ข๐ฅ๐๐ง๐๐ฉ๐ช๐ง๐-๐ฅ๐ช๐ก๐จ๐ ๐๐๐จ๐จ๐ค๐๐๐๐ฉ๐๐ค๐ฃ (๐๐๐๐๐ฉ& #39;๐จ ๐จ๐๐๐ฃ)
1/11
For every 1 deg F rise in temp, HR incrementally increases by 8-10 bpm (๐๐ฒ๐ฎ๐ซ๐ฎ๐ป๐ถ๐ฎ๐ฒ๐ผ๐ฝ๐ฎ๐ปโ๐ผ ๐ป๐พ๐ต๐ฎ) https://academic.oup.com/qjmed/article/os-20/78/205/1515205">https://academic.oup.com/qjmed/art...
๐๐๐ข๐ฅ๐๐ง๐๐ฉ๐ช๐ง๐-๐ฅ๐ช๐ก๐จ๐ ๐๐๐จ๐จ๐ค๐๐๐๐ฉ๐๐ค๐ฃ (๐๐๐๐๐ฉ& #39;๐จ ๐จ๐๐๐ฃ)
1/11
For every 1 deg F rise in temp, HR incrementally increases by 8-10 bpm (๐๐ฒ๐ฎ๐ซ๐ฎ๐ป๐ถ๐ฎ๐ฒ๐ผ๐ฝ๐ฎ๐ปโ๐ผ ๐ป๐พ๐ต๐ฎ) https://academic.oup.com/qjmed/article/os-20/78/205/1515205">https://academic.oup.com/qjmed/art...
2/11
This is a physical sign that may have become less popular now because of more sophisticated methods of diagnosing infections.
But knowing its application can expand our clinical reasoning toolkit and enhance bedside diagnosis and teaching.
This is a physical sign that may have become less popular now because of more sophisticated methods of diagnosing infections.
But knowing its application can expand our clinical reasoning toolkit and enhance bedside diagnosis and teaching.
3/11
There are a couple of ways to determine whether ๐๐๐ข๐ฅ๐๐ง๐๐ฉ๐ช๐ง๐-๐ฅ๐ช๐ก๐จ๐ ๐๐๐จ๐จ๐ค๐๐๐๐ฉ๐๐ค๐ฃ is present.
https://abs.twimg.com/emoji/v2/... draggable="false" alt="โช๏ธ" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> using a math equation to derive a cut-off HR below which, a diagnosis of "relative bradycardia" can be made
https://abs.twimg.com/emoji/v2/... draggable="false" alt="โช๏ธ" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> applying a set of criteria
There are a couple of ways to determine whether ๐๐๐ข๐ฅ๐๐ง๐๐ฉ๐ช๐ง๐-๐ฅ๐ช๐ก๐จ๐ ๐๐๐จ๐จ๐ค๐๐๐๐ฉ๐๐ค๐ฃ is present.
4/11
Ostergaard, et al proposed a calculation to determine โrelativeโ bradycardia" -- a pulse rate lower than 95% CI for the patientโs temp (determined among 673 patients
https://abs.twimg.com/emoji/v2/... draggable="false" alt="๐" title="Rรผckhand Zeigefinger nach unten" aria-label="Emoji: Rรผckhand Zeigefinger nach unten">):
Men: if HR <10.2 x T0C โ 333
Women: if HR <11 x T0C โ 359
https://www.sciencedirect.com/science/article/pii/S0163445396922252?via%3Dihub">https://www.sciencedirect.com/science/a...
Ostergaard, et al proposed a calculation to determine โrelativeโ bradycardia" -- a pulse rate lower than 95% CI for the patientโs temp (determined among 673 patients
Men: if HR <10.2 x T0C โ 333
Women: if HR <11 x T0C โ 359
https://www.sciencedirect.com/science/article/pii/S0163445396922252?via%3Dihub">https://www.sciencedirect.com/science/a...
5/11
On the other hand, Cunha proposed a more permissive criteria to determine relative bradycardia
https://abs.twimg.com/emoji/v2/... draggable="false" alt="๐" title="Rรผckhand Zeigefinger nach unten" aria-label="Emoji: Rรผckhand Zeigefinger nach unten">, based on:
https://abs.twimg.com/emoji/v2/... draggable="false" alt="โช๏ธ" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> a set of inclusion/exclusion criteria
https://abs.twimg.com/emoji/v2/... draggable="false" alt="โช๏ธ" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> set of expected HRs per given temp
https://www.sciencedirect.com/science/article/pii/S1198743X14637393?via%3Dihub">https://www.sciencedirect.com/science/a...
On the other hand, Cunha proposed a more permissive criteria to determine relative bradycardia
https://www.sciencedirect.com/science/article/pii/S1198743X14637393?via%3Dihub">https://www.sciencedirect.com/science/a...
6/11
Whatever method you use, once you determine that โrelative bradycardiaโ is present, you can look at a list and be familiar with the many conditions (infectious and non-infectious) that it has been traditionally associated with
https://abs.twimg.com/emoji/v2/... draggable="false" alt="๐" title="Rรผckhand Zeigefinger nach unten" aria-label="Emoji: Rรผckhand Zeigefinger nach unten">
https://www.sciencedirect.com/science/article/pii/S1198743X14637393?via%3Dihub">https://www.sciencedirect.com/science/a...
Whatever method you use, once you determine that โrelative bradycardiaโ is present, you can look at a list and be familiar with the many conditions (infectious and non-infectious) that it has been traditionally associated with
https://www.sciencedirect.com/science/article/pii/S1198743X14637393?via%3Dihub">https://www.sciencedirect.com/science/a...
7/11
The exact sensitivity and specificity of the Fagetโs sign is unknown. But data seems to show its diagnostic value in the following infections:
https://abs.twimg.com/emoji/v2/... draggable="false" alt="1โฃ" title="Tastenkappe Ziffer 1" aria-label="Emoji: Tastenkappe Ziffer 1"> Legionella
https://abs.twimg.com/emoji/v2/... draggable="false" alt="2โฃ" title="Tastenkappe Ziffer 2" aria-label="Emoji: Tastenkappe Ziffer 2"> Chlamydia
https://abs.twimg.com/emoji/v2/... draggable="false" alt="3โฃ" title="Tastenkappe Ziffer 3" aria-label="Emoji: Tastenkappe Ziffer 3"> Salmonella typhi (typhoid fever)
https://abs.twimg.com/emoji/v2/... draggable="false" alt="4โฃ" title="Tastenkappe Ziffer 4" aria-label="Emoji: Tastenkappe Ziffer 4"> Dengue
The exact sensitivity and specificity of the Fagetโs sign is unknown. But data seems to show its diagnostic value in the following infections:
8/11
Among close to 700 patients, relative bradycardia had no predictive value regarding most likely infection but found only in specific diseases:
https://abs.twimg.com/emoji/v2/... draggable="false" alt="โช๏ธ" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> typhoid fever (but NOT non-typhi Salmonella)
https://abs.twimg.com/emoji/v2/... draggable="false" alt="โช๏ธ" title="Schwarzes kleines Quadrat" aria-label="Emoji: Schwarzes kleines Quadrat"> Legionella & Chlamydia pneumonia (but NOT Mycoplasma) https://www.sciencedirect.com/science/article/pii/S0163445396922252?via%3Dihub">https://www.sciencedirect.com/science/a...
Among close to 700 patients, relative bradycardia had no predictive value regarding most likely infection but found only in specific diseases:
9/11
Case-control study (N=160) in Japan, the presence of relative bradycardia was diagnostic of typhoid fever (OR 11.7, LR+ 1.72). https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0179814">https://journals.plos.org/plosone/a...
Case-control study (N=160) in Japan, the presence of relative bradycardia was diagnostic of typhoid fever (OR 11.7, LR+ 1.72). https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0179814">https://journals.plos.org/plosone/a...
10/11
Case control study (N=70) in Singapore, relative bradycardia was a significant feature of dengue but not other causes of infection (p < 0.001))
https://wwwnc.cdc.gov/eid/article/13/4/06-1212_article">https://wwwnc.cdc.gov/eid/artic...
Case control study (N=70) in Singapore, relative bradycardia was a significant feature of dengue but not other causes of infection (p < 0.001))
https://wwwnc.cdc.gov/eid/article/13/4/06-1212_article">https://wwwnc.cdc.gov/eid/artic...
11/11
So next time you see a febrile patient (e.g. patient coming w/ CAP, returned traveler), try to see if you can apply the ๐๐๐๐๐ฉ& #39;๐จ ๐จ๐๐๐ฃ.
Has this sign ever been useful in your practice? Tell us about it. @DocWoc71 @BradCutrellMD @CarlosdelRio7 @PaulSaxMD @TxID_Edu
So next time you see a febrile patient (e.g. patient coming w/ CAP, returned traveler), try to see if you can apply the ๐๐๐๐๐ฉ& #39;๐จ ๐จ๐๐๐ฃ.
Has this sign ever been useful in your practice? Tell us about it. @DocWoc71 @BradCutrellMD @CarlosdelRio7 @PaulSaxMD @TxID_Edu