Prevalence and related factors of office and home hypotension in older treated hypertensive patients.

BACKGROUND: Older hypertensive adults under treatment are especially susceptible to hypotensive episodes, which entail an elevated risk. However, data on this subject are very scarce. AIM: The purpose of this study was to determine the prevalence and predictors of office and home hypotension in older (≥ 65 years) treated hypertensive adults. METHODS: Blood pressure (BP) was measured at the office and at home, using a validated oscillometric device. Office and home hypotension were defined as systolic BP (SBP) < 110 and/or diastolic BP (DBP) < 70 mmHg, and SBP < 105 and/or DBP < 65 mmHg, respectively. Masked hypotension was considered when office BP ≥ 110/70 and home BP < 105 and/or < 65 mmHg. We evaluated factors associated with hypotension both at the office and at home through multivariable models. RESULTS: The prevalence of hypotension among the 302 patients included in the study was 29.8% at the office and 23.9% at home, whereas the prevalence of masked hypotension was 10.4%. Older age, lower body mass index and use of calcium channel blockers were associated with office hypotension, while older age, diabetes and ischemic heart disease were predictors for home hypotension. CONCLUSION: Hypotension is frequent in older hypertensive adults under treatment. The presence of diabetes, ischemic heart disease and older age should alert for screening of hypotension at home to avoid overtreatment.

Mean platelet volume as a prognostic factor for venous thromboembolic disease.

BACKGROUND: Mean platelet volume (MPV) is a risk factor for cardiovascular and inflammatory diseases. AIM: To evaluate the association between high MPV and 90-day mortality after an episode of venous thromboembolism (VTE). MATERIAL AND METHODS: Retrospective cohort of 594 patients with a median age of 73 years (58% women) with a first episode VTE, included in an institutional Thromboembolic Disease registry between 2014 and 2015. MPV values were obtained from the automated blood cell count measured at the moment of VTE diagnosis. Volumes ≥ 11 fL were classified as high. All patients were followed for 90 days to assess survival. RESULTS: The main comorbidities were cancer in 221 patients (37%), sepsis in 172 (29%) and coronary artery disease in 107 (18%). Median MPV was 8 fl (8-9), brain natriuretic peptide 2,000 pg/ml (1,025-3,900) and troponin 40 pg/ml (19.5-75). Overall mortality was 20% (121/594) during the 90 days of follow-up. Thirty three deaths occurred within 7 days and 43 within the first month. The loss of patients from follow-up was 5% (28/594) at 90 days. Mortality among patients with high MP was 36% (23/63). The crude mortality hazard ratio (HR) for high MPV was 2.2 (95% confidence intervals (CI) 1.4-3.5). When adjusted for sepsis, oncological disease, heart disease, kidney failure and surgery, the mortality HR of high MPV was 2.4 (CI95% 1.5-3.9) in the VTE group, 2.3 (CI95% 1.5-4.4) in the deep venous thrombosis group, and 2.9 (CI95% 1.6 -5.6) in the pulmonary embolism group. CONCLUSIONS: High MPV is an independent risk factor for mortality following an episode of VTE.

[Prevalence of pain among patients admitted to a clinical hospital]. / Prevalencia de dolor en la internación en un hospital de alta complejidad de Argentina.

BACKGROUND: Pain prevalence during hospital admission is variable, with estimates ranging from 32 to 77%. AIM: To determine pain prevalence during admission to a clinical hospital. MATERIAL AND METHODS: Patients admitted to medical and surgical wards were interrogated about the presence of pain within 48 to 72 hours after admission. Subjective pain was analyzed using a scale ranging from 0 to 10. Data was analyzed separately for medical, surgical, and obstetrical patients. RESULTS: A total of 736 patients aged 18 to 94 years (416 women) were recruited. Pain prevalence at 48 hours after admission was 56% (95% confidence intervals (CI (52.7 to 60.1). Pain prevalence in medical, surgical and obstetric patients was 37% (95% CI 31.4 to 42.1), 70% (95% CI 64.5 to 75.5) and 77% (95% CI 68.6 to 84), respectively. The median pain intensities in medical, surgical, and obstetrical patients were 7 (interquartile range (IQR) 6-8), 7 (IQR 5-8) y 7 (IQR 5-8), respectively. CONCLUSIONS: The prevalence of pain among patients admitted to the hospital is high, especially in obstetric and surgical units.

Hemodynamic characterization of hypertensive patients with an exaggerated orthostatic blood pressure variation.

Exaggerated orthostatic blood pressure variation (EOV) is a poorly understood phenomenon related to high cardiovascular risk. We aimed to determine whether hypertensive patients with EOV have a distinct hemodynamic pattern, assessed through impedance cardiography. METHODS: In treated hypertensive patients, we measured the cardiac index (CI), systemic vascular resistance index (SVRI), blood pressure (BP), and heart rate (HR) in the supine and standing (after 3 minutes) positions, defining three groups according to BP variation: 1) Normal orthostatic BP variation (NOV): standing systolic BP (stSBP)-supine systolic BP (suSBP) between -20 and 20 mmHg and standing diastolic BP (stDBP)-supine diastolic BP (suDBP) between -10 and 10 mmHg; 2) orthostatic hypotension (OHypo): stSBP-suSBP≤-20 or stDBP-suDBP≤-10 mmHg; 3) orthostatic hypertension (OHyper): stSBP-suSBP≥20 or stDBP-suDBP≥10 mmHg. We performed multivariable analyses to determine the association of hemodynamic variables with EOV. RESULTS: We included 186 patients. Those with OHyper had lower suDBP and higher orthostatic SVRI variation compared to NOV. In multivariable analyses, orthostatic HR variation (OR = 1.06 (95%CI 1.01-1.13), p = 0.03) and orthostatic SVRI variation (OR = 1.16 (95%CI 1.06-1.28), p = 0.002) were independently related to OHyper. No variables were independently associated with OHypo. CONCLUSION: Patients with OHyper have a distinct hemodynamic pattern, with an exaggerated increase in SVRI and HR when standing.

Effect of angiotensin 2 receptor blockers on chronic obstructive lung disease mortality: A retrospective cohort study.

INTRODUCTION: Chronic Obstructive Pulmonary Disease (COPD) is the fifth cause of mortality worldwide. Systemic inflammation is a crucial element in its physiopathology. As Renin-Angiotensin System is one of the main components of this inflammatory neurohumoral cascade, Angiotensin Receptor Blockers (ARBs) might have an effect on mortality in COPD patients. GOAL: To evaluate the association between ARBs treatment and mortality in COPD patients. METHODS: Retrospective cohort of patients with diagnosis of COPD from 2003 to 2013. COPD cases were detected according to the diagnosis by treating physicians in any field of the electronic clinical health records by controlled vocabulary in patients older than 18 years affiliated to the Hospital Italiano de Buenos Aires (HIBA) Health Plan. Patients were classified in two groups depending on their use of ARBs according to the hospital pharmacy records. The mortality registry of the HIBA was used to obtain the event of death. The 8 year survival experience was described using Kaplan Meier estimator and survival curve comparisons were calculated with the Cox Mantel test. Hazard Ratios (HR) were estimated using a Cox proportional risk model. A propensity score (PS) was developed for the use of ARBs. RESULTS: 1140 deaths were detected, 1063 in the no exposure group and 77 in the ARBs exposure group. The 8 year survival was 71% (CI 95% 69-72%). The survival in the non exposed group was 71% (CI 95% 69-73%) and 76% (CI 95% 0,69-0,81) in the ARBs exposed group. The unadjusted HR for mortality was 0.85 (CI 95% 0.67-1.07, p = 0.17) and the adjusted HR by PS was 0.63 (CI 95% 0.50-0.80, p < 0.001). DISCUSSION: ARBs use seems to be associated to a lower mortality in patients with COPD. Additional studies are needed to corroborate this finding.

[Analysis of Crowding in an Adult Emergency Department of a tertiary university hospital]. / Descripción de las características del fenómeno Crowding en la Central de Emergencia de Adultos, en un hospital universitario de alta complejidad: estudio de cohorte retrospectiva.

BACKGROUND: Crowding in Emergency Departments (ED), results from the imbalance between the simultaneous demand for health care and the ability of the system to respond. The NEDOCS scale (National Emergency Department Crowding Scale) measures the degree of crowding in an ED. AIM: To describe ED Crowding characteristics, using the NEDOCS scale, in an Argentinean hospital. MATERIAL AND METHODS: A retrospective cohort study was conducted with all adult patient consultations between July 2013 and July 2014 at the ED of Hospital Italiano de Buenos Aires. We included all hours in the analysis period (365 days x 24 h = 8,760). The NEDOCS value was calculated for each hour using an automatic algorithm and was quantified in a six points score. Levels 4 (overcrowded), 5 (severely overcrowded) and 6 (dangerously overcrowded) were defined as overcrowding. Contour plots analysis was applied to identify patterns. RESULTS: During the study period, 124,758 visits to the ED were registered. Overcrowding was present in 57.7% (5,055) of the analyzed hours. A predominance of scores between four and five was observed between 10:00 and 24:00 hours. The months with predominance of overcrowding were June, July and August (southern winter). CONCLUSIONS: The calculation of the NEDOCS score and the analysis of its temporal distribution are highly relevant to identify opportunities for improvement and to develop mechanisms to prevent the highest categories of overcrowding.

[Hemophagocytic lymphohistiocytosis. Experience in 27 patients]. / Características clínicas y mortalidad de pacientes adultos con síndrome hemafagocítico, estudio de cohorte retrospectiva.

BACKGROUND: Hemophagocytic lymphohistiocytosis (HLH) is an aggressive and life-threatening syndrome of excessive immune activation Aim: To describe the clinical characteristics, causes and survival associated with HLH. MATERIAL AND METHODS: Review of medical records of patients with HLH attended between 2004 and 2016. They were classified according to their probable cause in: associated with immunosuppression, cancer, post-infectious or idiopathic. Kaplan-Meier survival analysis was performed. RESULTS: Twenty seven patients with HLH aged 18 to 87 years (59% men), were detected. Fourteen (52%) were secondary to immunosuppression, six (22%) were post-infectious, five (18%) were associated with cancer and two (7%) were of unknown cause. There were no significant differences in clinical or laboratory features between these etiologies. Within the immunosuppressed group, 12 (86%) were patients with oncologic or hematologic diseases or bone marrow transplantation. Associated cancers were mostly oncohematologic diseases. Thirty-day mortality was 53.4% (95% confidence intervals (CI) 32.7-70.3%), despite the treatment. Mortality was significantly associated with the presence of renal failure with a hazard ratio (HR) of 3.4 (95% CI of 1.2-9.9, p =0.025). Treatment of the underlying disease proved to be protective against mortality with an HR of 0.3 (95% CI 0.1 to 0.98, p = 0.046). CONCLUSIONS: The prognosis of HLH could be related to the treatment of the underlying disease. The study of the pathophysiology of this syndrome will allow a better understanding and treatment.

[Clinical predictors of hemorrhagic transformation in non lacunar ischemic stroke]. / Predictores clínicos de transformación hemorrágica en accidente cerebrovascular isquémico no lacunar.

Hemorrhagic transformation is a complex phenomenon where brain tissue bleeds, which could be associated or not to an increase in the neurological deficit after the acute ischemic stroke. The aim of our study was to evaluate clinical predictors of hemorrhagic transformation in patients with non-lacunar ischemic stroke. We performed a prospective analysis of the clinical records and images of patients with non-lacunar ischemic stroke. Demographics, vascular risk factors, previous medications and the information of the event in patients with and without hemorrhagic transformation were here compared. We included in this study 747 patients with non-lacunar stroke, the mean age was 77 ± 11 years and 61% were females. In the univariate analysis, the age, a history of hypertension, atrial fibrillation, chronic kidney disease and the previous use of oral anticoagulation resulted statistically significant. In the multivariate analysis of logistic regression adjusted by age and vascular risk factors: the age > 80 years (OR 3.6, CI 95% 1.8-7.6), the pulse pressure > 60 mmHg at admission (OR 5.3, CI 95% 3.2-9.1), the chronic kidney disease (OR 3, CI 95% 2.5-3.8) and the presence of previous atrial fibrillation (OR 3.5, CI 95% 2.1-6.1) were associated with and increased risk of hemorrhagic transformation. The predictors of hemorrhagic transformation in our cohort showed a relationship with severe vascular illness. The identification of these patients could influence therapeutic decisions that could increase the risk of hemorrhagic transformation.

Meal-induced blood pressure fall in patients with isolated morning hypertension.

We aimed to determine a possible association between isolated morning hypertension (IMH) and meal-induced blood pressure (BP) fall in adult treated hypertensive patients who underwent home BP measurements. A total of 230 patients were included, median age 73.6, 65.2% women. After adjusting for age, sex, number of antihypertensive drugs, office and home BP levels, the association between IMH and meal-induced BP fall was statistically significant. In conclusion, meal-induced BP fall and IMH detected through home blood pressure monitoring (HBPM) are independently associated in hypertensive patients. The therapeutic implications of such observation need to be clarified in large-scale prospective studies.

[Clinical characteristics of adult patients with herpetic meningoencephalitis: a nested case control study]. / Variables clínicas asociadas al diagnóstico de meningo-encefalitis herpética en pacientes adultos: un estudio anidado de casos y controles.

INTRODUCTION: Herpes simplex virus (HSV) is the most common etiology of sporadic encephalitis and presents with an estimated mortality of 50-70%. OBJECTIVE: To describe baseline characteristics of patients with herpetic encephalitis admitted to a tertiary teaching hospital and their difference with patients with non herpetic encephalitis. MATERIALS AND METHODS: Nested case control study using a retrospective cohort of patients with suspected encephalitis admitted to the Hospital Italiano de Buenos Aires (2006-2013). Adult patients included had a lumbar puncture with a positive or negative polimerase reaction for HSV. A case of herpetic encephalitis was defined as a positive polimerase reaction in spinal fluid. For each case, 5 controls were randomly selected. RESULTS: There were no baseline differences present between cases and controls. The only covariate associated with herpetic encephalitis was an abnormal brain magnetic resonance imaging (MRI) (OR: 5.37, IC 95% 1.42-20.38, p < 0.01). The most frecuent alterations in the MRI were extratemporal lesions or temporal ones with or without haemorrhage. DISCUSSION: There are no apparent baseline clinical differences between patients with or without herpetic encephalitis. A positive finding in a brain MRI should be taken into account during clinical workup.

[Pneumocystis jiroveci infection in patients with and without HIV: A comparison]. / Comparación de infecciones por Pneumocystis jiroveci en pacientes con y sin diagnóstico de infección por VIH.

BACKGROUND: Respiratory infection caused by Pneumocystis jiroveci is a common opportunistic infection in patients with human immunodeficiency virus (HIV) with CD4 counts < 200 cells/mm(3). However, it has also been reported in patients with other causes of immunosuppression. OBJECTIVES: To compare the characteristics, severity and mortality of respiratory infection by P. jiroveci in patients with and without HIV infection. METHODS: Retrospective cohort follow-up of adult patients admitted to our hospital with infection by P. jiroveci since 2006 to 2013. RESULTS: We included 82 patients with respiratory infection by P. jiroveci of which 55% (45) were not infected with HIV. In this group, 68.8% (31) had diagnosis of cancer and 20% (9) received solid-organ transplant. 57.9% (26) were hospitalized in an intensive care unit. 42.2% (19) suffered multiple organ failure (MOF), 46.7% (21) required mechanical ventilation (MV) and 40.9% (18) inotropic drugs. Mortality was 33.3% (15). Statistically significant differences were observed between groups in age (p < 0.001), requirement of MV (p < 0.001) inotropic drugs (p 0.001) and MOF (p < 0.001). Mortality was higher in the HIV-positive group, reaching statistical significance (p 0.007). CONCLUSION: Pneumocystis pneumonia mortality was higher in patients without HIV, who suffered more complications and progression to respiratory failure with MOF.

Predictive value of non-invasive hemodynamic measurement by means of impedance cardiography in hypertensive subjects older than 50 years of age.

The prognostic value of impedance cardiography (ICG; cardiac index [CI] and systemic vascular resistance index [SVRI] were measured) was assessed in this retrospective cohort study. A total of 1151 hypertensive outpatients >50 years with a baseline ICG were included. After median follow-up of 3.9 years, for the composite endpoint of cardiovascular events and stroke, adjusted HR for each 500 ml/min/m(2) CI increase was 0.85 (CI95% 0.73-0.9, p = 0.039), and for each 500 dynes s cm(-5) SVRI increase was 1.11 (CI95% 1.01-1.23, p = 0.046), whereas adjusted HR for all-cause mortality was not significant. ICG adds prognostic value to conventional risk factors in hypertensive patients.

Impact of Lipoprotein(a) Levels on Cardiovascular Risk Estimation.

INTRODUCTION: A new cardiovascular risk (CVR) calculator that incorporates Lipoprotein(a) [Lp(a)] levels has recently been designed. AIMS: To estimate CVR using the new score and to identify the reduction in low-density lipoprotein cholesterol (LDL-C) or systolic blood pressure (SBP) necessary to balance the risk attributable to Lp(a). METHODS: CVR throughout life and at 10 years was estimated with the new score in patients in primary prevention, both considering and not considering the value of Lp(a). When the estimated risk considering Lp(a) levels exceeded the baseline risk, the reduction in LDL-C levels or SBP necessary to balance the risk attributable to Lp(a) was calculated. RESULTS: In total, 671 patients (mean age 54.2 years, 47.2% women) were included. Globally, 22.7% of the population had high Lp(a) values (> 50 mg/dL or > 125 nmol/L). When calculating CVR throughout life and considering the Lp(a) value, the global risk increased in 66.7% of cases (median 19.3%). Similar results were observed when we assessed the 10-year risk. The risk associated with Lp(a) could be completely compensated by decreasing LDL-C (average 21 mg/dL) or SBP (average 6.3 mmHg) in 79.2% and 74.7% of cases, respectively. CONCLUSION: When calculating the CVR with the new score, two-thirds and one-third of the population were bidirectionally recategorized as 'up' or 'down,' respectively. The decrease in LDL-C or SBP mitigated the increased risk caused by Lp(a) levels across a substantial proportion of patients.

Prevalence and clinical profile of resistant hypertension among treated hypertensive subjects.

We assessed prevalence and clinical characteristics of resistant hypertension (RH) and prevalence of false RH (white-coat effect [WCE] by home blood pressure [BP] monitoring), among a population of 302 treated hypertensive patients, mean age 66.6 (± 13.8), 67.5% women. Resistant hypertension was defined according to the American Heart Association criteria. Prevalence of RH was 10%, and the following five variables were independently associated with it: body mass index, diabetes, isolated systolic hypertension, orthostatic hypotension, and use of beta-blockers. Prevalence of WCE among subjects with office-RH was 27.6%. Our study identified easily measurable parameters related to RH. Standing BP should be systematically measured in individuals with RH.

Impact of COVID-19 vaccination in post-COVID cardiac complications.

BACKGROUND: After the acute infection, COVID-19 can produce cardiac complications as well as long-COVID persistent symptoms. Although vaccination against COVID-19 represented a clear reduction in both mortality and ICU admissions, there is very little information on whether this was accompanied by a decrease in the prevalence of post-COVID cardiac complications. The aim of this study was to analyze the relationship between COVID-19 vaccination and the prevalence of post-COVID cardiac injury assessed by echocardiogram, and long-COVID persistent cardiac symptoms. METHODS: All patients who consulted for post-COVID evaluation 14 days after discharge from acute illness were included. Patients with heart disease were excluded. The relationship between complete vaccination scheme (at least two doses applied with 14 days or more since the last dose) and pathological echocardiographic findings, as well as the relationship of vaccination with persistent long-COVID symptoms, were evaluated by multivariate analysis, adjusting for age, sex and clinical variables that would have shown significant differences in univariate analysis. RESULTS: From 1883 patients, 1070 patients (56.8%) suffered acute COVID-19 without a complete vaccination scheme. Vaccination was associated with lower prevalence of cardiac injury (1.35% versus 4.11%, adjusted OR 0.33; 95% CI 0.17-0.65, p=0.01). In addition, vaccinated group had a lower prevalence of persistent long-COVID symptoms compared to unvaccinated patients (10.7% versus 18.3%, adjusted OR 0.52; 95% CI 0.40-0.69, p<0.001). CONCLUSION: Vaccination against COVID-19 was associated with lower post-COVID cardiac complications and symptoms, reinforcing the importance of fully vaccinating the population.

[Clinical research in internal medicine residencies in Argentina. Supporters and detractors]. / La investigación clínica en residencias de medicina interna de la Argentina. Facilitadores y barreras.

Several academic and government organizations have strongly recommended the inclusion of specific competences in clinical research. So far, the current state of research within this framework has not been modified in our country. The main goal of this study was to provide a thorough description of the research activities in medical residencies, which could be used as an indicator of the acquisition of such competences and to identify the supporters and detractors to achieve them. A cross section study was carried out and several levels were analyzed in order to consider residencies as a cluster; 382 residents from 24 different residencies were included. the study showed a preponderance of women. the average age was 29 years old. A 71% of the residents asserted doing research. Half of those residents have stated being authors of papers presented in congresses; only 9% have published their experience. Factors which predict the development of research assignments were: to belong to a large residency, oR 16.99 (IC 95%, 2.096-137.87), being in the 3rd year of the residency, oR 9.95 (IC 95%, 2.84-34.82), completion of a research course, oR 2.78 (IC 95%, 1.10-7.04). Variables which reduce the chance to do research: location in Buenos Aires, oR 0.25 (IC 95%, 0.0072-0.91), being a woman, oR 0.34 (IC 95%, 0.14-0.79) and patients assistance workload, OR 0.97 (IC 95%, 0.95-0.99). We believe that the identification of factors which influence the possibility of doing research will lead to a improvement in the training of medical residents.

Cost-effectiveness of a hypertension management programme in an elderly population: a Markov model.

BACKGROUND: Mounting evidence shows that multi-intervention programmes for hypertension treatment are more effective than an isolated pharmacological strategy. Full economic evaluations of hypertension management programmes are scarce and contain methodological limitations. The aim of the study was to evaluate if a hypertension management programme for elderly patients is cost-effective compared to usual care from the perspective of a third-party payer. METHODS: We built a cost-effectiveness model using published evidence of effectiveness of a comprehensive hypertension programme vs. usual care for patients 65 years or older at a community hospital in Buenos Aires, Argentina. We explored incremental cost-effectiveness between groups. The model used a life-time framework adopting a third-party payer's perspective. Incremental cost-effectiveness ratio (ICER) was calculated in International Dollars per life-year gained. We performed a probabilistic sensitivity analysis (PSA) to explore variable uncertainty. RESULTS: The ICER for the base-case of the "Hypertension Programme" versus the "Usual care" approach was 1,124 International Dollars per life-year gained. PSA did not significantly influence results. The programme had a probability of 43% of being dominant (more effective and less costly) and, overall, 95% chance of being cost-effective. DISCUSSION: Results showed that "Hypertension Programme" had high probabilities of being cost-effective under a wide range of scenarios. This is the first sound cost-effectiveness study to assess a comprehensive hypertension programme versus usual care. This study measures hard outcomes and explores robustness through a probabilistic sensitivity analysis. CONCLUSIONS: The comprehensive hypertension programme had high probabilities of being cost-effective versus usual care. This study supports the idea that similar programmes could be the preferred strategy in countries and within health care systems where hypertension treatment for elderly patients is a standard practice.

[Reproducibility and reliability of a 4-day HBPM protocol with and without first day measurements]. / Reproducibilidad y confiabilidad de un protocolo de 4 días de monitoreo domiciliario de presión arterial con y sin exclusión del primer día.

HBPM guidelines state that morning and evening measurements should be recorded and, to improve stability, the first day of measurements should be discarded. Our objective was to assess the reproducibility and reliability of a 4-day HBPM protocol with and without first day measurements. We analyzed a retrospective cohort of ambulatory patients who required a HBPM for diagnostic purposes or evaluation of treatment efficacy. A 4-day protocol was implemented, with daily duplicate measurements in the morning, afternoon and evening, using an OMRON 705 CP validated equipment. HBPM reproducibility was quantified by test-re-test correlations and standard deviation of differences (SDD) between BP measurements obtained during the entire 4 days, with and without exclusion of the first day. The reliability criterion was the stabilization of the mean and standard deviation (SD). We included 353 subjects with a total of 8224 BP recordings (median of 24 recordings per patient). We found a strong test-re-test correlation between days 1 to 4, which improved when we excluded the first day (p<0.001). We also found a reduction of the mean BP when we increased the number of days and a reduction of SDD when we excluded day 1. Therefore, we conclude that the exclusion of the first day of measurements improves the reproducibility and reliability of a 4-day protocol, and such two factors are not affected by the inclusion of afternoon measurements.

[Internal Medicine Residencies in Argentina, 2008]. / Formación en las residencias de clínica médica en la Argentina, 2008.

The acquisition of medical competence in the Internal Medicine Residencies (IMR) is a complex process. In Argentina there are not current data available on the number, organization and the way the residencies work. The objective of this study was to survey the IMR in Argentina and categorize their academic and general structure. From June 2007 to June 2008 we identified all the IMR using a combined searching strategy. We contacted them looking for structural and organizational data. Academic data were collected in a sample of 24 residencies using questionnaires. We also gathered data using qualitative measurements, in a subsample of 15 residencies, by means of direct observation and in-depth interviews. We identified 162 ongoing residencies and a total of 2012 residents. The majority of them (87%) were located in big cities, with a preponderance of public residencies (66%); 13% of these didn't have a residency instructor or coordinator. Most of these didn't have Institutional Internet available. The residents median age was 29 years old (Intercuartil range 2.7), with a 64.5% of women; 24% were under the regimen called "concurrente". From the sample, 230 residents were interviewed; 13% of them (CI95% 9-18.7) did not receive any remuneration. The rest received a monthly payment (in Arg $) ranging from US$ 140 to 552. A 58% (13/22) was involved in Specialist courses. Medians for weekly working hours and for "on duty" were respectively 50 and 8 per month, with no difference between public or private institutions. These findings evidence the need to certify the formative and academic process of IMR.